Fix Architecture Detection

Changed functionality of pack_bits_8to1_u8_u8
Added pack_bits_1to8_u8_u8, pattern_search_u8_u8, dbpsk_decoder_c_u8, bfsk_demod_cf

.gitignore

@@ -3,5 +3,8 @@ nmux
 ddcd
 *.o
 *.so
+*.so.*
 tags
 dumpvect.*.vect
+*.swp
+grc_tests/top_block.py

Makefile

@@ -28,13 +28,7 @@
 
 LIBSOURCES =  fft_fftw.c libcsdr_wrapper.c 
 #SOURCES = csdr.c $(LIBSOURCES)
-cpufeature = $(if $(findstring $(1),$(shell cat /proc/cpuinfo)),$(2))
+PARAMS_SIMD = $(shell ./detect_params.sh)
-PARAMS_SSE = $(call cpufeature,sse,-msse) $(call cpufeature,sse2,-msse2) $(call cpufeature,sse3,-msse3) $(call cpufeature,sse4a,-msse4a) $(call cpufeature,sse4_1,-msse4.1) $(call cpufeature,sse4_2,-msse4.2 -msse4) -mfpmath=sse 
-PARAMS_NEON = -mfloat-abi=hard -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mvectorize-with-neon-quad -funsafe-math-optimizations -Wformat=0 -DNEON_OPTS
-#tnx Jan Szumiec for the Raspberry Pi support
-PARAMS_RASPI = -mfloat-abi=hard -mcpu=arm1176jzf-s -mfpu=vfp -funsafe-math-optimizations -Wformat=0
-PARAMS_ARM = $(if $(call cpufeature,BCM2708,dummy-text),$(PARAMS_RASPI),$(PARAMS_NEON))
-PARAMS_SIMD = $(if $(call cpufeature,sse,dummy-text),$(PARAMS_SSE),$(PARAMS_ARM))
 PARAMS_LOOPVECT = -O3 -ffast-math -fdump-tree-vect-details -dumpbase dumpvect
 PARAMS_LIBS = -g -lm -lrt -lfftw3f -DUSE_FFTW -DLIBCSDR_GPL -DUSE_IMA_ADPCM
 PARAMS_SO = -fpic  
@@ -42,16 +36,22 @@ PARAMS_MISC = -Wno-unused-result
 #DEBUG_ON = 0 #debug is always on by now (anyway it could be compiled with `make DEBUG_ON=1`)
 #PARAMS_DEBUG = $(if $(DEBUG_ON),-g,)
 FFTW_PACKAGE = fftw-3.3.3
+PREFIX ?= /usr
+SOVERSION = 0.15
+PARSEVECT ?= yes
 
-.PHONY: clean-vect clean
+.PHONY: clean-vect clean codequality checkdocs v
-all: csdr nmux
+all: codequality csdr nmux
 libcsdr.so: fft_fftw.c fft_rpi.c libcsdr_wrapper.c libcsdr.c libcsdr_gpl.c fastddc.c fastddc.h  fft_fftw.h  fft_rpi.h  ima_adpcm.h  libcsdr_gpl.h  libcsdr.h  predefined.h
 	@echo NOTE: you may have to manually edit Makefile to optimize for your CPU \(especially if you compile on ARM, please edit PARAMS_NEON\).
 	@echo Auto-detected optimization parameters: $(PARAMS_SIMD)
 	@echo
 	rm -f dumpvect*.vect
-	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) $(LIBSOURCES) $(PARAMS_LIBS) $(PARAMS_MISC) -fpic -shared -o libcsdr.so
+	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) $(LIBSOURCES) $(PARAMS_LIBS) $(PARAMS_MISC) -fpic -shared -Wl,-soname,libcsdr.so.$(SOVERSION) -o libcsdr.so.$(SOVERSION)
+	@ln -fs libcsdr.so.$(SOVERSION) libcsdr.so
+ifeq ($(PARSEVECT),yes)
 	-./parsevect dumpvect*.vect
+endif
 csdr: csdr.c libcsdr.so
 	gcc -std=gnu99 $(PARAMS_LOOPVECT) $(PARAMS_SIMD) csdr.c $(PARAMS_LIBS) -L. -lcsdr $(PARAMS_MISC) -o csdr
 ddcd: ddcd.cpp libcsdr.so ddcd.h
@@ -64,19 +64,19 @@ arm-cross: clean-vect
 clean-vect:
 	rm -f dumpvect*.vect
 clean: clean-vect
-	rm -f libcsdr.so csdr ddcd nmux
+	rm -f libcsdr.so.$(SOVERSION) csdr ddcd nmux *.o *.so
 install: all 
-	install -m 0755 libcsdr.so /usr/lib
+	install -m 0755 libcsdr.so.$(SOVERSION) $(PREFIX)/lib
-	install -m 0755 csdr /usr/bin
+	install -m 0755 csdr $(PREFIX)/bin
-	install -m 0755 csdr-fm /usr/bin
+	install -m 0755 csdr-fm $(PREFIX)/bin
-	install -m 0755 nmux /usr/bin
+	install -m 0755 nmux $(PREFIX)/bin
-	#-install -m 0755 ddcd /usr/bin
+	#-install -m 0755 ddcd $(PREFIX)/bin
-	ldconfig
+	@ldconfig || echo please run ldconfig
 uninstall:
-	rm /usr/lib/libcsdr.so /usr/bin/csdr /usr/bin/csdr-fm
+	rm $(PREFIX)/lib/libcsdr.so.$(SOVERSION) $(PREFIX)/bin/csdr $(PREFIX)/bin/csdr-fm
 	ldconfig
 disasm:
-	objdump -S libcsdr.so > libcsdr.disasm
+	objdump -S libcsdr.so.$(SOVERSION) > libcsdr.disasm
 emcc-clean:
 	-rm sdr.js/sdr.js
 	-rm sdr.js/sdrjs-compiled.js
@@ -96,3 +96,12 @@ emcc:
 	cat sdr.js/sdrjs-header.js sdr.js/sdrjs-compiled.js sdr.js/sdrjs-footer.js > sdr.js/sdr.js
 emcc-beautify:
 	bash -c 'type js-beautify >/dev/null 2>&1; if [ $$? -eq 0 ]; then js-beautify sdr.js/sdr.js >sdr.js/sdr.js.beautiful; mv sdr.js/sdr.js.beautiful sdr.js/sdr.js; fi'
+codequality:
+	@bash -c 'if [ `cat csdr.c | grep badsyntax | grep -v return | wc -l` -ne 1 ]; then echo "error at code quality check: badsyntax() used in csdr.c without return."; exit 1; else exit 0; fi'
+checkdocs:
+	@cat csdr.c | grep strcmp | egrep 'argv\[1\]' | awk -F'"' '$$0=$$2' > /tmp/csdr-list-of-functions
+	@cat /tmp/csdr-list-of-functions | xargs -I{} bash -c 'if ! cat csdr.c | grep \"\ \ \ \ {} >/dev/null ; then echo "warning: \"{}\"  is in csdr.c code, but not in usage string"; fi'
+	@cat /tmp/csdr-list-of-functions | xargs -I{} bash -c 'if ! cat README.md | grep {} >/dev/null ; then echo "warning: \"{}\"  is in csdr.c code, but not in README.md"; fi'
+	@rm /tmp/csdr-list-of-functions
+v:
+	vim csdr.c libcsdr.c

detect_params.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+# This software is part of libcsdr, a set of simple DSP routines for 
+# Software Defined Radio.
+#
+# Copyright (c) 2014, Andras Retzler <randras@sdr.hu>
+# Copyright (c) 2019, MeFisto94
+# All rights reserved.
+# 
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#    * Neither the name of the copyright holder nor the
+#      names of its contributors may be used to endorse or promote products
+#      derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# This file will try to detect the correct GCC optimization parameters, especially when running on ARM Platforms such as the Raspberry Pi
+
+# Desktop Processors
+if grep -q sse /proc/cpuinfo; then
+    if grep -q sse /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE-msse"
+    fi
+    if grep -q sse2 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse2"
+    fi
+    if grep -q sse3 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse3"
+    fi
+    if grep -q sse4a /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse4a"
+    fi
+    if grep -q sse4_1 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse4.1"
+    fi
+    # TODO: Is this "-msse4" only for sse4_2 intended?
+    if grep -q sse4_2 /proc/cpuinfo; then
+        PARAMS_SSE="$PARAMS_SSE -msse4.2 -msse4"
+    fi
+    echo "$PARAMS_SSE -mfpmath=sse"
+    return 0
+else
+    ARCH=$(uname -m)
+    # Detect Raspberry Pi
+    if grep -q 'Raspberry' /proc/device-tree/model; then
+        if [ "$ARCH" = "aarch64" ]; then # Probably RPi 3+ on 64bit
+            # Float ABI is always hard on AARCH64. TODO: Does RPi 1 or 2 also have aarch64?
+            PARAMS_PI="-mcpu=cortex-a53 -mtune=cortex-a53"
+        else # note -mcpu replaces -march
+        # See https://gist.github.com/fm4dd/c663217935dc17f0fc73c9c81b0aa845
+            if grep -q 3 /proc/device-tree/model; then
+                PARAMS_PI="-mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -mneon-for-64bits"
+            elif grep -q 2 /proc/device-tree/model; then
+                PARAMS_PI="-mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4"
+            elif grep -q 1 /proc/device-tree/model; then
+                PARAMS_PI="-mcpu=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp"
+            fi
+        fi
+        PARAMS_ARM="$PARAMS_PI -funsafe-math-optimizations -Wformat=0"
+    else # Generic ARM Device
+        # Most likely mtune is incorrect here
+        PARAMS_ARM = "-mfloat-abi=hard -march=`uname -m` -mtune=cortex-a8 -mfpu=neon -mvectorize-with-neon-quad -funsafe-math-optimizations -Wformat=0 -DNEON_OPTS"
+    fi
+    echo $PARAMS_ARM
+    return 0
+fi

fft_fftw.h

@@ -22,6 +22,7 @@ struct fft_plan_s
 #include "libcsdr.h"
 
 FFT_PLAN_T* make_fft_c2c(int size, complexf* input, complexf* output, int forward, int benchmark);
+FFT_PLAN_T* make_fft_r2c(int size, float* input, complexf* output, int benchmark);
 void fft_execute(FFT_PLAN_T* plan);
 void fft_destroy(FFT_PLAN_T* plan);
 

grc_tests/bpsk31_ber.py

@@ -0,0 +1,53 @@
+#!/usr/bin/python
+
+import os, time, signal
+from subprocess import *
+#https://bugs.python.org/issue1652
+
+def p(x):
+    global printcmds
+    if printcmds: print x
+    return check_output(x, shell=True)
+
+printcmds=True
+
+
+def genfiles(snr):
+    cmd="""(while true; do echo -n 'CQ CQ CQ DE HA7ILM HA7ILM HA7ILM PSE K '; done) | \
+csdr psk31_varicode_encoder_u8_u8 | \
+tee /s/bpsk31_testin | \
+csdr differential_encoder_u8_u8 | \
+csdr psk_modulator_u8_c 2 | \
+csdr psk31_interpolate_sine_cc 256 | \
+csdr awgn_cc %d | \
+csdr timing_recovery_cc GARDNER 256 0.5 2 --add_q | \
+csdr dbpsk_decoder_c_u8 | \
+dd bs=1024 count=10 of=/s/bpsk31_testout
+"""%snr
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+    if printcmds: print cmd
+    os.system(cmd)
+
+def getminsize():
+    return min(os.path.getsize("/s/bpsk31_testout"), os.path.getsize("/s/bpsk31_testin"))
+
+def mkdiff(shift):
+    if shift==0:
+        return int(p("cmp -l /s/bpsk31_testin /s/bpsk31_testout | wc -l"))
+    elif shift<0:
+        return int(p("(dd if=/dev/zero bs=%d count=1; cat /s/bpsk31_testin)>/s/bpsk31_testin0; cmp -l /s/bpsk31_testin0 /s/bpsk31_testout | wc -l"%-shift))
+    elif shift>0:
+        return int(p("(dd if=/dev/zero bs=%d count=1; cat /s/bpsk31_testout)>/s/bpsk31_testout0; cmp -l /s/bpsk31_testin /s/bpsk31_testout0 | wc -l"%shift))
+
+
+lf=open("/s/output_results","w")
+
+for snr in range(0,20,2):
+    genfiles(snr)
+    num_totalbits=getminsize()
+    num_errors=None
+    for shift in range(-5,5):
+        curr_num_errors = mkdiff(shift)
+        if not num_errors or (num_errors and num_errors > curr_num_errors):
+            num_errors = curr_num_errors
+    lf.write("%d; %d; %d; %d\n" %(snr, num_errors, num_totalbits, num_errors/float(num_totalbits)))

grc_tests/bpsk31_scurve.m

@@ -0,0 +1,67 @@
+#!/usr/bin/octave
+
+%{
+function [output]=fgc(path, type)
+	if(type(1)=='f')
+	elseif(type(1)=='c')
+	end
+end
+%}
+
+function output=shrunf(cmd)
+	SIGTERM=15;
+	output=[];
+	[pin, pout, pid]=popen2('bash',{'-c', cmd});
+	%fclose(pin);
+	sleep(0.1)
+	do
+		current_output=fread(pout, Inf, 'float32');
+		output=[output; current_output];
+	until(feof(pout))
+	waitpid(pid);
+	%kill(pid, SIGTERM);
+    fclose(pin);
+    fclose(pout);
+end
+
+function error_value=run_tr(skip, which_ted) 
+	out_vect=shrunf(sprintf('dd bs=8 skip=%d if=bpsk31_baseband_sample_complex_8000_sps_010101.raw | csdr timing_recovery_cc %s 256 --add_q --output_error', skip, which_ted));
+	error_value=out_vect(2);
+end
+
+function error_values=mkscurve(which_ted, skips)
+    error_values=[]
+    for skip=skips
+        error_values=[error_values run_tr(skip, which_ted)];
+    end
+end
+
+function fmtplot(h)
+    FN = findall(h,'-property','FontName');
+    set(FN,'FontName','/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerifCondensed.ttf');
+    set(FN,'FontName','times');
+    FS = findall(h,'-property','FontSize');
+    set(FS,'FontSize',18);
+    xlabel('Phase offset in number of samples');
+    ylabel('Error value (TED output)');
+end
+
+skips_gardner=0:16:256
+error_values_gardner=mkscurve('GARDNER',skips_gardner);
+skips_earlylate=0:16:256
+error_values_earlylate=mkscurve('EARLYLATE',skips_earlylate);
+
+%graphics_toolkit("gnuplot")
+h=figure(1);
+
+plot((skips_gardner-128)/256, -error_values_gardner, 'linewidth', 2);
+title('S-curve for Gardner TED');
+fmtplot(h)
+grid on
+pause
+
+plot((skips_earlylate-128)/256, error_values_earlylate, 'linewidth', 2);
+title('S-curve for early-late TED');
+fmtplot(h)
+grid on
+pause

grc_tests/bpsk31_tedvar.m

@@ -0,0 +1,99 @@
+#!/usr/bin/octave
+
+%you need to first install the parallel and struct packages:
+%pkg install -forge struct
+%pkg install -forge parallel
+pkg load parallel
+
+function y=inarg(x)
+    for i=1:length(argv())
+        if strcmp(argv(){i},x)
+            y=1;
+            return
+        end
+    end
+    y=0;
+end
+
+bpfcmd="csdr bandpass_fir_fft_cc $(csdr \"=-31.25/8e3\") $(csdr \"=31.25/8e3\") $(csdr \"=31.25/8e3\") | ";
+
+if !inarg('--nogen')
+    fwrite(stdout, "===========================================\nGenerating baseband signal from random data\n===========================================\n");
+    system(["cat /dev/urandom | csdr pack_bits_8to1_u8_u8 | csdr psk_modulator_u8_c 2 | csdr gain_ff 0.25 | csdr psk31_interpolate_sine_cc 256 | " bpfcmd "csdr add_n_zero_samples_at_beginning_f 170 | pv -ps 2g | dd iflag=fullblock bs=128M count=16 of=/tmp/psk31-raw-data"]);
+    fwrite(stdout, "===========================================\nGenerating Gaussian white noise for agwn_cc\n===========================================\n");
+    system(["csdr gaussian_noise_c | " bpfcmd "pv -ps 256m | dd of=/tmp/psk31-gaussian-noise iflag=fullblock bs=256M count=1"]);
+end
+if inarg('--onlygen') 
+    exit(0)
+end
+fwrite(stdout, "===========================================\nCalculating variance graph data            \n===========================================\n");
+
+function output=shrun(cmd, type, minsize)
+    SIGTERM=15;
+    output=[];
+    cmd
+    [pin, pout, pid]=popen2('bash',{'-c', cmd});
+    %fclose(pin);
+    do
+        sleep(0.3)
+        fwrite(stdout,'.');
+        %size(output)
+        %output
+        current_output=fread(pout, Inf, type);
+        frewind(pout);
+        output=[output; current_output];
+    until(size(output)(1)>=minsize)
+    waitpid(pid);
+    kill(pid, SIGTERM);
+    fclose(pin);
+    fclose(pout);
+end
+
+function variance=run_var(snr, which_ted)
+    disp('ran a command')
+    out_vect=shrun(sprintf('cat /tmp/psk31-raw-data | csdr awgn_cc %d --awgnfile /tmp/psk31-gaussian-noise | csdr simple_agc_cc 0.0001 0.5 | csdr timing_recovery_cc %s 256 0.5 2 --add_q --output_indexes | CSDR_FIXED_BUFSIZE=1048576 csdr normalized_timing_variance_u32_f 256 85', snr, which_ted), 'float32', 1);
+    disp('run_var output:');
+    out_vect'
+    variance=out_vect(1);
+end
+
+function variances=mkvarplot(which_ted, snrs)
+    fun = @(x) run_var(x, which_ted);
+    variances=pararrayfun(nproc, fun, snrs);
+    %{
+    variances=[]
+    for snr=snrs
+        snr
+        variances=[variances run_var(snr, which_ted)];
+    end
+    %}
+end
+
+function fmtplot(h)
+    FN = findall(h,'-property','FontName');
+    set(FN,'FontName','/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerifCondensed.ttf');
+    set(FN,'FontName','times');
+    FS = findall(h,'-property','FontSize');
+    set(FS,'FontSize',18);
+    xlabel('E_b/N_0 [dB]');
+    ylabel('Phase error variance [rad^2]');
+end
+
+%snrs=-10:5:10
+snrs=-10:5:25
+%snrs=[10]
+error_values=mkvarplot('EARLYLATE',snrs);
+
+%graphics_toolkit("gnuplot")
+h=figure(1);
+
+ebn0=snrs+9.7
+
+semilogy(ebn0, error_values, 'linewidth', 2);
+title('Estimation variance');
+fmtplot(h)
+pause
+
+if !inarg('--nogen')
+    system('rm /tmp/psk31-raw-data /tmp/psk31-gaussian-noise');
+end

grc_tests/psk31_sigmodel.m

@@ -0,0 +1,70 @@
+#!/usr/bin/octave
+
+global Tb=20
+
+function g=gbb(t) %impulse response of pulse shaping filter
+	global Tb
+	g=t;
+	for i = 1:size(t)(2)
+		if (t(i)>1*Tb || t(i)<=-1*Tb)
+			g(i) = 0;
+		else
+			g(i) = 0.5+cos((t(i)/(Tb*1))*pi)/2; %this is not RRC, rather a sinusoidal pulse shape
+		end
+	end
+end
+
+global padding=[-2 2];
+
+function [toreturny, plotrange]=y(s)
+	global Tb
+    global padding
+	slen=size(s)(2)
+	plotrange=((padding(1)-1)*Tb):(slen+padding(2))*Tb-1;
+	plotlen=size(plotrange)(2)
+	toreturny=zeros(1,plotlen);
+	for i=1:slen %sum of (symbol[i] * filter impulse response) for all symbols
+		toreturny+=s(i)*gbb(plotrange.-(i-1)*Tb); 
+	end
+    plotrange=plotrange/Tb
+end
+
+function fmtplot(h)
+    FN = findall(h,'-property','FontName');
+    set(FN,'FontName','/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerifCondensed.ttf');
+    set(FN,'FontName','times');
+    FS = findall(h,'-property','FontSize');
+    set(FS,'FontSize',18);
+    set(FS,'FontSize',18);
+end
+
+h=figure(1);
+subplot(2, 1, 1);
+[a b]=y([1]);
+plot(b, a, 'linewidth', 2)
+title(sprintf("Impulse response of pulse shaping filter"))
+xlabel('t/Ts')
+ylabel('h(t)')
+
+subplot(2, 1, 2);
+[a b]=y([1 1 -1 -1 1 1 1 -1 1 -1 1 1]);
+plot(b, a, 'linewidth', 2)
+title("Baseband signal for modulator input\nbit sequence: 110011101011") %assuming that differential encoding has already been performed
+xlabel('t/Ts')
+ylabel('s(t)')
+xbounds = xlim;
+set(gca,'XTick',xbounds(1):xbounds(2));
+fmtplot(h);
+pause
+exit
+
+%fourier analisys of baseband signal
+h2=figure(2);
+padding=[-1 1]
+plot(y([1]))
+h3=figure(3);
+fftvals=abs(fft(y([1])));
+sizefftvals=size(fftvals)(2)
+fftvals=[fftvals(sizefftvals/2:sizefftvals) fftvals(2:sizefftvals/2)]
+plot(fftvals, "-")
+pause

grc_tests/test_awgn.grc

@@ -0,0 +1,669 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Sun Nov 16 15:12:31 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(120, 147)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>amplitude</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 147)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>frequency</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>samp_rate/2</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-samp_rate/2</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 83)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>40e3</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_sig_source_x</key>
+    <param>
+      <key>amp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>freq</key>
+      <value>frequency</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(184, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_sig_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>amplitude</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(344, 43)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(496, 43)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr awgn_cc 10 --snrshow</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(344, 275)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(616, 203)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(856, 75)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>blocks_throttle_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_bpsk31_to_octave.grc

@@ -0,0 +1,675 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Mon Oct 13 20:03:23 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(184, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>48e3</value>
+    </param>
+  </block>
+  <block>
+    <key>audio_source</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>device_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(56, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>audio_source_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_outputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ok_to_block</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>int(samp_rate)</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_file_sink</key>
+    <param>
+      <key>append</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>/home/pcfl/Asztal/szakdoga/dipterv1/bpsk31_input_f.raw</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(232, 251)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_file_sink_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_file_sink</key>
+    <param>
+      <key>append</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>/home/pcfl/Asztal/szakdoga/dipterv1/bpsk31_baseband_c.raw</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1032, 91)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_file_sink_0_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>freq_xlating_fir_filter_xxx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>center_freq</key>
+      <value>2000</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(296, 123)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>freq_xlating_fir_filter_xxx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>[1]</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fcc</value>
+    </param>
+  </block>
+  <block>
+    <key>low_pass_filter</key>
+    <param>
+      <key>beta</key>
+      <value>6.76</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>cutoff_freq</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fir_filter_ccf</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(536, 99)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>low_pass_filter_0</value>
+    </param>
+    <param>
+      <key>interp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>width</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>firdes.WIN_HAMMING</value>
+    </param>
+  </block>
+  <block>
+    <key>notebook</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(280, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>nb</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['tab1', 'tab2', 'tab3', 'tab4']</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.NB_TOP</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1032, 187)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(232, 339)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>audio_source_0</source_block_id>
+    <sink_block_id>blocks_file_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>audio_source_0</source_block_id>
+    <sink_block_id>freq_xlating_fir_filter_xxx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>audio_source_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>freq_xlating_fir_filter_xxx_0</source_block_id>
+    <sink_block_id>low_pass_filter_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>low_pass_filter_0</source_block_id>
+    <sink_block_id>blocks_file_sink_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>low_pass_filter_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_bpsk_costas_loop_convertwavs.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+sox -r 48k -t f32 -c 2 /s/costas_nco -t wav -e floating-point /s/costas_nco.wav 
+sox -r 48k -t f32 -c 1 /s/costas_error -t wav -e floating-point /s/costas_error.wav 
+sox -r 48k -t f32 -c 1 /s/costas_dphase -t wav -e floating-point --norm=-6 /s/costas_dphase.wav 
+sox -r 48k -t f32 -c 2 /s/costas_input -t wav -e floating-point /s/costas_input.wav 
+sox -r 48k -t f32 -c 2 /s/costas_output -t wav -e floating-point /s/costas_output.wav 
+sox -r 48k -t f32 -c 2 /s/tr_input -t wav -e floating-point /s/tr_input.wav 
+ls -al /s/costas_nco.wav /s/costas_error.wav /s/costas_dphase.wav /s/costas_output.wav /s/costas_input.wav
+
+

grc_tests/test_m_fsk.grc

@@ -0,0 +1,816 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Sat Oct 31 16:06:38 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280*2, 1024*4</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(272, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>interp</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1024*4</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(176, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2**16</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_complex_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 65)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_complex_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_interleave</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>blocksize</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(904, 65)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_interleave_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_streams</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(496, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vco_c</key>
+    <param>
+      <key>amplitude</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(248, 139)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_vco_c_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>sensitivity</key>
+      <value>samp_rate*0.9</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vector_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 139)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_vector_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>tags</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vector</key>
+      <value>[2]*interp+[-2]*interp+[0.333*2]*interp+[-0.333*2]*interp</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_sink_f</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr fmdemod_quadri_cf | csdr dsb_fc | csdr fir_decimate_cc 40 | csdr timing_recovery_cc GARDNER 100 0.5 2 --add_q | CSDR_FIXED_BUFSIZE=64 csdr realpart_cf | CSDR_FIXED_BUFSIZE=64 csdr gain_ff 2.5 | CSDR_FIXED_BUFSIZE=64 csdr generic_slicer_f_u8 4 &gt; /s/mfsksymbols</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1040, 75)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_sink_f_0</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr fmdemod_quadri_cf | csdr dsb_fc | csdr bandpass_fir_fft_cc -0.1 0.1 0.001 | csdr timing_recovery_cc GARDNER 1024 0.5 2 --add_q | csdr realpart_cf | csdr generic_slicer_f_u8 4 &gt; /s/sliced</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(528, 467)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1040, 115)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_scopesink2</key>
+    <param>
+      <key>ac_couple</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(864, 443)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_scopesink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>t_scale</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Scope Plot</value>
+    </param>
+    <param>
+      <key>trig_mode</key>
+      <value>wxgui.TRIG_MODE_AUTO</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>v_offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>v_scale</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>xy_mode</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>y_axis_label</key>
+      <value>Counts</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_waterfallsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dynamic_range</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>512</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(864, 251)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_waterfallsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Waterfall Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>blocks_complex_to_float_0</source_block_id>
+    <sink_block_id>blocks_interleave_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_complex_to_float_0</source_block_id>
+    <sink_block_id>blocks_interleave_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_interleave_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_sink_f_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_complex_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>wxgui_waterfallsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vco_c_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0</source_block_id>
+    <sink_block_id>blocks_vco_c_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_noise.grc

@@ -0,0 +1,702 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Sun Nov 16 15:12:31 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 83)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e3</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_const_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(40, 179)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_const_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_complex_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(392, 313)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_complex_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(216, 179)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(680, 91)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(800, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0_0_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr noise_f</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 227)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr noise_f</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(568, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>ff</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(896, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(976, 259)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_const_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_complex_to_float_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_complex_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0_0_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>blocks_throttle_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0_0</source_block_id>
+    <sink_block_id>blocks_throttle_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_peaks_fir.grc

@@ -0,0 +1,752 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Sun Nov 16 15:12:31 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 83)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1e3</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_random_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>2147483647</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-2147483648</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>int</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_deinterleave</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>blocksize</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(384, 169)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_deinterleave_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_streams</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_float_to_complex</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(544, 169)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_float_to_complex_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_int_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(208, 179)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_int_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>2147483647.</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(736, 179)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate*10</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr peaks_fir_cc 101 -0.2 -0.1 0 0.1 0.2</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(168, 339)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(472, 435)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(976, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_scopesink2</key>
+    <param>
+      <key>ac_couple</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(480, 299)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_scopesink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>t_scale</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Scope Plot</value>
+    </param>
+    <param>
+      <key>trig_mode</key>
+      <value>wxgui.TRIG_MODE_AUTO</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>v_offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>v_scale</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>xy_mode</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>y_axis_label</key>
+      <value>Counts</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>blocks_int_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_deinterleave_0</source_block_id>
+    <sink_block_id>blocks_float_to_complex_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_deinterleave_0</source_block_id>
+    <sink_block_id>blocks_float_to_complex_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_float_to_complex_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_int_to_float_0</source_block_id>
+    <sink_block_id>blocks_deinterleave_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_rtty_parts.grc

@@ -0,0 +1,746 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Mon Oct 13 20:03:23 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(184, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>48e3</value>
+    </param>
+  </block>
+  <block>
+    <key>audio_source</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>device_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(56, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>audio_source_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_outputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ok_to_block</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>int(samp_rate)</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_deinterleave</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>blocksize</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 113)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_deinterleave_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_streams</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_float_to_complex</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(808, 113)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_float_to_complex_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr dsb_fc | csdr shift_addition_cc $(csdr =-2000/48e3) | csdr fir_decimate_cc 48 </value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(384, 123)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>ff</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr resonators_fir_cc 31 $(csdr =85/1e3) $(csdr =-85/1e3) | CSDR_FIXED_BUFSIZE=128 csdr simple_agc_cc 0.0001 0.5</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(752, 275)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>notebook</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 40)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>nb</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['input signal', 'decimated', 'filtered', 'tab4']</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.NB_TOP</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1048, 251)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value>nb, 2</value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate/48</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(280, 227)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value>nb, 0</value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Input signal</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1048, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0_1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value>nb, 1</value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate/48</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>audio_source_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>audio_source_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_deinterleave_0</source_block_id>
+    <sink_block_id>blocks_float_to_complex_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_deinterleave_0</source_block_id>
+    <sink_block_id>blocks_float_to_complex_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_float_to_complex_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_float_to_complex_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>blocks_deinterleave_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

grc_tests/test_simple_agc.grc

@@ -0,0 +1,844 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.8'?>
+<flow_graph>
+  <timestamp>Sun Nov 16 15:12:31 2014</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 170)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>48000</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_agc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(432, 355)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_agc_xx_0</value>
+    </param>
+    <param>
+      <key>max_gain</key>
+      <value>65536</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>1e-2</value>
+    </param>
+    <param>
+      <key>reference</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+  </block>
+  <block>
+    <key>audio_sink</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>device_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1152, 427)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>audio_sink_0</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ok_to_block</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+  </block>
+  <block>
+    <key>band_reject_filter</key>
+    <param>
+      <key>beta</key>
+      <value>6.76</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fir_filter_fff</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(392, 35)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>high_cutoff_freq</key>
+      <value>2000</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>band_reject_filter_0</value>
+    </param>
+    <param>
+      <key>interp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>low_cutoff_freq</key>
+      <value>1600</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>width</key>
+      <value>50</value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>firdes.WIN_HAMMING</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_complex_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(928, 289)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_complex_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>0.2</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(968, 427)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_wavfile_source</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>/home/pcfl/Asztal/szakdoga/dipterv1/csdr-varicode/grc_tests/outfile.wav</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(152, 163)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_wavfile_source_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>nchan</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>freq_xlating_fir_filter_xxx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>center_freq</key>
+      <value>2000</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(832, 75)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>freq_xlating_fir_filter_xxx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>[1]</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fcc</value>
+    </param>
+  </block>
+  <block>
+    <key>freq_xlating_fir_filter_xxx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>center_freq</key>
+      <value>-2000</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(696, 275)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>freq_xlating_fir_filter_xxx_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>[1]</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>ccc</value>
+    </param>
+  </block>
+  <block>
+    <key>ha5kfu_execproc_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>commandline</key>
+      <value>csdr simple_agc_cc 0.001 0.05</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(384, 291)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>ha5kfu_execproc_xx_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>cc</value>
+    </param>
+  </block>
+  <block>
+    <key>low_pass_filter</key>
+    <param>
+      <key>beta</key>
+      <value>6.76</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>cutoff_freq</key>
+      <value>3000</value>
+    </param>
+    <param>
+      <key>decim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fir_filter_fff</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(584, 43)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>low_pass_filter_0</value>
+    </param>
+    <param>
+      <key>interp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>width</key>
+      <value>50</value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>firdes.WIN_HAMMING</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>avg_alpha</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>freqvar</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(688, 403)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>wxgui_fftsink2_0</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>10</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_agc_xx_0</source_block_id>
+    <sink_block_id>freq_xlating_fir_filter_xxx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>analog_agc_xx_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>band_reject_filter_0</source_block_id>
+    <sink_block_id>low_pass_filter_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_complex_to_float_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>audio_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_wavfile_source_0</source_block_id>
+    <sink_block_id>band_reject_filter_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>freq_xlating_fir_filter_xxx_0</source_block_id>
+    <sink_block_id>analog_agc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>freq_xlating_fir_filter_xxx_0</source_block_id>
+    <sink_block_id>ha5kfu_execproc_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>freq_xlating_fir_filter_xxx_0_0</source_block_id>
+    <sink_block_id>blocks_complex_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>freq_xlating_fir_filter_xxx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>ha5kfu_execproc_xx_0</source_block_id>
+    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>low_pass_filter_0</source_block_id>
+    <sink_block_id>freq_xlating_fir_filter_xxx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>

libcsdr.h

@@ -30,6 +30,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
 #define MIN_M(x,y) (((x)>(y))?(y):(x))
+#define MAX_M(x,y) (((x)<(y))?(y):(x))
 
 /*
    _____                      _
@@ -47,9 +48,9 @@ typedef struct complexf_s { float i; float q; } complexf;
 //apply to pointers:
 #define iof(complexf_input_p,i) (*(((float*)complexf_input_p)+2*(i)))
 #define qof(complexf_input_p,i) (*(((float*)complexf_input_p)+2*(i)+1))
-#define absof(complexf_input_p,i) (sqrt(iof(complexf_input_p,i)*iof(complexf_input_p,i)+qof(complexf_input_p,i)*qof(complexf_input_p,i)))
+#define absof(complexf_input_p,i) (sqrt((iof(complexf_input_p,i)*iof(complexf_input_p,i))+(qof(complexf_input_p,i)*qof(complexf_input_p,i))))
 #define argof(complexf_input_p,i) (atan2(qof(complexf_input_p,i),iof(complexf_input_p,i)))
-#define cmult(cfo, cfi1, cfi2) iof(cfo,0)=iof(cfi1,0)*iof(cfi2,0)-qof(cfi1,0)*qof(cfi2,0);qof(cfo,0)=iof(cfi1,0)*qof(cfi2,0)+iof(cfi2,0)*qof(cfi1,0)
+#define cmult(cfo, cfi1, cfi2) {iof(cfo,0)=iof(cfi1,0)*iof(cfi2,0)-qof(cfi1,0)*qof(cfi2,0);qof(cfo,0)=iof(cfi1,0)*qof(cfi2,0)+iof(cfi2,0)*qof(cfi1,0);}
 //(ai+aq*j)*(bi+bq*j)=ai*bi-aq*bq+(aq*bi+ai*bq)*j
 #define cmultadd(cfo, cfi1, cfi2) { iof(cfo,0)+=iof(cfi1,0)*iof(cfi2,0)-qof(cfi1,0)*qof(cfi2,0);qof(cfo,0)+=iof(cfi1,0)*qof(cfi2,0)+iof(cfi2,0)*qof(cfi1,0); }
 #define csetnull(cf) { iof(cf,0)=0.0; qof(cf,0)=0.0; }
@@ -68,7 +69,7 @@ typedef struct complexf_s { float i; float q; } complexf;
 //window
 typedef enum window_s
 {
-	WINDOW_BOXCAR, WINDOW_BLACKMAN, WINDOW_HAMMING
+    WINDOW_BOXCAR, WINDOW_BLACKMAN, WINDOW_HAMMING
 } window_t;
 
 #define WINDOW_DEFAULT WINDOW_HAMMING
@@ -101,37 +102,38 @@ void limit_ff(float* input, float* output, int input_size, float max_amplitude);
 //filters, decimators, resamplers, shift, etc.
 float fir_one_pass_ff(float* input, float* taps, int taps_length);
 int fir_decimate_cc(complexf *input, complexf *output, int input_size, int decimation, float *taps, int taps_length);
+int fir_interpolate_cc(complexf *input, complexf *output, int input_size, int interpolation, float *taps, int taps_length);
 int deemphasis_nfm_ff (float* input, float* output, int input_size, int sample_rate);
 float deemphasis_wfm_ff (float* input, float* output, int input_size, float tau, int sample_rate, float last_output);
 float shift_math_cc(complexf *input, complexf* output, int input_size, float rate, float starting_phase);
 
 typedef struct dcblock_preserve_s
 {
-	float last_input;
+    float last_input;
-	float last_output;
+    float last_output;
 } dcblock_preserve_t;
 dcblock_preserve_t dcblock_ff(float* input, float* output, int input_size, float a, dcblock_preserve_t preserved);
 float fastdcblock_ff(float* input, float* output, int input_size, float last_dc_level);
 
 typedef struct fastagc_ff_s
 {
-	float* buffer_1;
+    float* buffer_1;
-	float* buffer_2;
+    float* buffer_2;
-	float* buffer_input; //it is the actual input buffer to fill
+    float* buffer_input; //it is the actual input buffer to fill
-	float peak_1;
+    float peak_1;
-	float peak_2;
+    float peak_2;
-	int input_size;
+    int input_size;
-	float reference;
+    float reference;
-	float last_gain;
+    float last_gain;
 } fastagc_ff_t;
 
 void fastagc_ff(fastagc_ff_t* input, float* output);
 
 typedef struct rational_resampler_ff_s
 {
-	int input_processed;
+    int input_processed;
-	int output_size;
+    int output_size;
-	int last_taps_delay;
+    int last_taps_delay;
 } rational_resampler_ff_t;
 
 rational_resampler_ff_t rational_resampler_ff(float *input, float *output, int input_size, int interpolation, int decimation, float *taps, int taps_length, int last_taps_delay);
@@ -140,6 +142,7 @@ void rational_resampler_get_lowpass_f(float* output, int output_size, int interp
 float *precalculate_window(int size, window_t window);
 void apply_window_c(complexf* input, complexf* output, int size, window_t window);
 void apply_precalculated_window_c(complexf* input, complexf* output, int size, float *windowt);
+void apply_precalculated_window_f(float* input, float* output, int size, float *windowt);
 void apply_window_f(float* input, float* output, int size, window_t window);
 void logpower_cf(complexf* input, float* output, int size, float add_db);
 void accumulate_power_cf(complexf* input, float* output, int size);
@@ -147,16 +150,37 @@ void log_ff(float* input, float* output, int size, float add_db);
 
 typedef struct fractional_decimator_ff_s
 {
-	float remain;
+    float where;
-	int input_processed;
+    int input_processed;
-	int output_size;
+    int output_size;
+    int num_poly_points; //number of samples that the Lagrange interpolator will use
+    float* poly_precalc_denomiator; //while we don't precalculate coefficients here as in a Farrow structure, because it is a fractional interpolator, but we rather precaculate part of the interpolator expression
+    //float* last_inputs_circbuf; //circular buffer to store the last (num_poly_points) number of input samples.
+    //int last_inputs_startsat; //where the circular buffer starts now
+    //int last_inputs_samplewhere; 
+    float* coeffs_buf;
+    float* filtered_buf;
+    int xifirst; 
+    int xilast; 
+    float rate;
+    float *taps;
+    int taps_length;
 } fractional_decimator_ff_t;
-fractional_decimator_ff_t fractional_decimator_ff(float* input, float* output, int input_size, float rate, float *taps, int taps_length, fractional_decimator_ff_t d);
+fractional_decimator_ff_t fractional_decimator_ff_init(float rate, int num_poly_points, float* taps, int taps_length);
+void fractional_decimator_ff(float* input, float* output, int input_size, fractional_decimator_ff_t* d);
+
+typedef struct old_fractional_decimator_ff_s
+{
+    float remain;
+    int input_processed;
+    int output_size;
+} old_fractional_decimator_ff_t;
+old_fractional_decimator_ff_t old_fractional_decimator_ff(float* input, float* output, int input_size, float rate, float *taps, int taps_length, old_fractional_decimator_ff_t d);
 
 typedef struct shift_table_data_s
 {
-	float* table;
+    float* table;
-	int table_size;
+    int table_size;
 } shift_table_data_t;
 void shift_table_deinit(shift_table_data_t table_data);
 shift_table_data_t shift_table_init(int table_size);
@@ -164,9 +188,9 @@ float shift_table_cc(complexf* input, complexf* output, int input_size, float ra
 
 typedef struct shift_addfast_data_s
 {
-	float dsin[4];
+    float dsin[4];
-	float dcos[4];
+    float dcos[4];
-	float phase_increment;
+    float phase_increment;
 } shift_addfast_data_t;
 shift_addfast_data_t shift_addfast_init(float rate);
 shift_addfast_data_t shift_addfast_init(float rate);
@@ -174,10 +198,10 @@ float shift_addfast_cc(complexf *input, complexf* output, int input_size, shift_
 
 typedef struct shift_unroll_data_s
 {
-	float* dsin;
+    float* dsin;
-	float* dcos;
+    float* dcos;
-	float phase_increment;
+    float phase_increment;
-	int size;
+    int size;
 } shift_unroll_data_t;
 float shift_unroll_cc(complexf *input, complexf* output, int input_size, shift_unroll_data_t* d, float starting_phase);
 shift_unroll_data_t shift_unroll_init(float rate, int size);
@@ -206,3 +230,183 @@ void convert_s24_f(unsigned char* input, float* output, int input_size, int bige
 
 
 int is_nan(float f);
+
+//digital demod
+
+typedef struct rtty_baudot_item_s
+{
+    unsigned long long code;
+    unsigned char ascii_letter;
+    unsigned char ascii_figure;
+} rtty_baudot_item_t;
+
+typedef enum rtty_baudot_decoder_state_e
+{
+    RTTY_BAUDOT_WAITING_STOP_PULSE = 0,
+    RTTY_BAUDOT_WAITING_START_PULSE,
+    RTTY_BAUDOT_RECEIVING_DATA
+} rtty_baudot_decoder_state_t;
+
+typedef struct rtty_baudot_decoder_s
+{
+    unsigned char fig_mode;
+    unsigned char character_received;
+    unsigned short shr;
+    unsigned char bit_cntr;
+    rtty_baudot_decoder_state_t state;
+} rtty_baudot_decoder_t;
+
+#define RTTY_FIGURE_MODE_SELECT_CODE 0b11011
+#define RTTY_LETTER_MODE_SELECT_CODE 0b11111
+
+char rtty_baudot_decoder_lookup(unsigned char* fig_mode, unsigned char c);
+char rtty_baudot_decoder_push(rtty_baudot_decoder_t* s, unsigned char symbol);
+
+//PSK31
+
+typedef struct psk31_varicode_item_s
+{
+    unsigned long long code;
+    int bitcount;
+    unsigned char ascii;
+} psk31_varicode_item_t;
+
+char psk31_varicode_decoder_push(unsigned long long* status_shr, unsigned char symbol);
+
+//Serial
+
+typedef struct serial_line_s
+{
+    float samples_per_bits;
+    int databits; //including parity
+    float stopbits;
+    int output_size;
+    int input_used;
+    float bit_sampling_width_ratio;
+} serial_line_t;
+
+void serial_line_decoder_f_u8(serial_line_t* s, float* input, unsigned char* output, int input_size);
+void binary_slicer_f_u8(float* input, unsigned char* output, int input_size);
+
+
+typedef enum pll_type_e
+{
+    PLL_P_CONTROLLER=1,
+    PLL_PI_CONTROLLER=2
+} pll_type_t;
+
+typedef struct pll_s
+{
+    pll_type_t pll_type;
+    //common:
+    float output_phase;
+    float dphase;
+    float frequency;
+    float alpha;
+    float beta;
+    float iir_temp;
+} pll_t;
+
+void pll_cc_init_pi_controller(pll_t* p, float bandwidth, float ko, float kd, float damping_factor);
+void pll_cc_init_p_controller(pll_t* p, float alpha);
+void pll_cc(pll_t* p, complexf* input, float* output_dphase, complexf* output_nco, int input_size);
+
+typedef enum timing_recovery_algorithm_e
+{
+    TIMING_RECOVERY_ALGORITHM_GARDNER, 
+    TIMING_RECOVERY_ALGORITHM_EARLYLATE 
+} timing_recovery_algorithm_t;
+
+#define TIMING_RECOVERY_ALGORITHM_DEFAULT TIMING_RECOVERY_ALGORITHM_GARDNER
+
+typedef struct timing_recovery_state_s
+{
+    timing_recovery_algorithm_t algorithm;
+    int decimation_rate; // = input_rate / output_rate. We should get an input signal that is N times oversampled. 
+    int output_size;
+    int input_processed;
+    int use_q; //use both I and Q for calculating the error
+    int debug_phase;
+    int debug_every_nth;
+    char* debug_writefiles_path;
+    int last_correction_offset;
+    float earlylate_ratio;
+    float loop_gain;
+    float max_error;
+} timing_recovery_state_t;
+
+timing_recovery_state_t timing_recovery_init(timing_recovery_algorithm_t algorithm, int decimation_rate, int use_q, float loop_gain, float max_error, int debug_every_nth, char* debug_writefiles_path);
+void timing_recovery_cc(complexf* input, complexf* output, int input_size, float* timing_error, int* sampled_indexes,  timing_recovery_state_t* state);
+timing_recovery_algorithm_t timing_recovery_get_algorithm_from_string(char* input);
+char* timing_recovery_get_string_from_algorithm(timing_recovery_algorithm_t algorithm);
+void octave_plot_point_on_cplxsig(complexf* signal, int signal_size, float error, int index, int correction_offset, char* writefiles_path, int points_size, ...);
+void psk_modulator_u8_c(unsigned char* input, complexf* output, int input_size, int n_psk);
+void duplicate_samples_ntimes_u8_u8(unsigned char* input, unsigned char* output, int input_size_bytes, int sample_size_bytes, int ntimes);
+complexf psk31_interpolate_sine_cc(complexf* input, complexf* output, int input_size, int interpolation, complexf last_input);
+void psk31_varicode_encoder_u8_u8(unsigned char* input, unsigned char* output, int input_size, int output_max_size, int* input_processed, int* output_size);
+unsigned char differential_codec(unsigned char* input, unsigned char* output, int input_size, int encode, unsigned char state);
+
+#if 0
+typedef struct bpsk_costas_loop_state_s
+{
+    float rc_filter_alpha;
+    float vco_phase_addition_multiplier;
+    float vco_phase;
+    float last_lpfi_output;
+    float last_lpfq_output;
+    float last_vco_phase_addition;
+} bpsk_costas_loop_state_t;
+
+bpsk_costas_loop_state_t init_bpsk_costas_loop_cc(float samples_per_bits);
+void bpsk_costas_loop_cc(complexf* input, complexf* output, int input_size, bpsk_costas_loop_state_t* state);
+#endif 
+
+typedef struct bpsk_costas_loop_state_s
+{
+    float alpha;
+    float beta;
+    int decision_directed;
+    float current_freq;
+    float dphase;
+    float nco_phase;
+    float dphase_max;
+    int dphase_max_reset_to_zero;
+} bpsk_costas_loop_state_t;
+
+void plain_interpolate_cc(complexf* input, complexf* output, int input_size, int interpolation);
+void bpsk_costas_loop_cc(complexf* input, complexf* output, int input_size, float* output_error, float* output_dphase, complexf* output_nco, bpsk_costas_loop_state_t* s);
+void init_bpsk_costas_loop_cc(bpsk_costas_loop_state_t* s, int decision_directed, float damping_factor, float bandwidth);
+
+void simple_agc_cc(complexf* input, complexf* output, int input_size, float rate, float reference, float max_gain, float* current_gain);
+void firdes_add_peak_c(complexf* output, int length, float rate, window_t window, int add, int normalize);
+int apply_fir_cc(complexf* input, complexf* output, int input_size, complexf* taps, int taps_length);
+
+
+FILE* init_get_random_samples_f();
+void get_random_samples_f(float* output, int output_size, FILE* status);
+void get_random_gaussian_samples_c(complexf* output, int output_size, FILE* status);
+int deinit_get_random_samples_f(FILE* status);
+float* add_ff(float* input1, float* input2, float* output, int input_size);
+float total_logpower_cf(complexf* input, int input_size);
+float normalized_timing_variance_u32_f(unsigned* input, float* temp, int input_size, int samples_per_symbol, int initial_sample_offset, int debug_print);
+
+typedef enum matched_filter_type_e
+{
+    MATCHED_FILTER_RRC, 
+    MATCHED_FILTER_COSINE 
+} matched_filter_type_t;
+
+#define MATCHED_FILTER_DEFAULT MATCHED_FILTER_RRC
+
+int firdes_cosine_f(float* taps, int taps_length, int samples_per_symbol);
+int firdes_rrc_f(float* taps, int taps_length, int samples_per_symbol, float beta);
+matched_filter_type_t matched_filter_get_type_from_string(char* input);
+int apply_real_fir_cc(complexf* input, complexf* output, int input_size, float* taps, int taps_length);
+void generic_slicer_f_u8(float* input, unsigned char* output, int input_size, int n_symbols);
+void plain_interpolate_cc(complexf* input, complexf* output, int input_size, int interpolation);;
+void normalize_fir_f(float* input, float* output, int length);
+float* add_const_cc(complexf* input, complexf* output, int input_size, complexf x);
+void pack_bits_1to8_u8_u8(unsigned char* input, unsigned char* output, int input_size);
+unsigned char pack_bits_8to1_u8_u8(unsigned char* input);
+void dbpsk_decoder_c_u8(complexf* input, unsigned char* output, int input_size);
+int bfsk_demod_cf(complexf* input, float* output, int input_size, complexf* mark_filter, complexf* space_filter, int taps_length);

libcsdr_gpl.c

@@ -51,6 +51,33 @@ float shift_addition_cc(complexf *input, complexf* output, int input_size, shift
 	return starting_phase;
 }
 
+float shift_addition_fc(float *input, complexf* output, int input_size, shift_addition_data_t d, float starting_phase)
+{
+	//The original idea was taken from wdsp:
+	//http://svn.tapr.org/repos_sdr_hpsdr/trunk/W5WC/PowerSDR_HPSDR_mRX_PS/Source/wdsp/shift.c
+
+	//However, this method introduces noise (from floating point rounding errors), which increases until the end of the buffer.
+	//fprintf(stderr, "cosd=%g sind=%g\n", d.cosdelta, d.sindelta);
+	float cosphi=cos(starting_phase);
+	float sinphi=sin(starting_phase);
+	float cosphi_last, sinphi_last;
+	for(int i=0;i<input_size;i++) //@shift_addition_cc: work
+	{
+		iof(output,i)=cosphi*input[i];
+		qof(output,i)=sinphi*input[i];
+		//using the trigonometric addition formulas
+		//cos(phi+delta)=cos(phi)cos(delta)-sin(phi)*sin(delta)
+		cosphi_last=cosphi;
+		sinphi_last=sinphi;
+		cosphi=cosphi_last*d.cosdelta-sinphi_last*d.sindelta;
+		sinphi=sinphi_last*d.cosdelta+cosphi_last*d.sindelta;
+	}
+	starting_phase+=d.rate*PI*input_size;
+	while(starting_phase>PI) starting_phase-=2*PI; //@shift_addition_cc: normalize starting_phase
+	while(starting_phase<-PI) starting_phase+=2*PI;
+	return starting_phase;
+}
+
 shift_addition_data_t shift_addition_init(float rate)
 {
 	rate*=2;

libcsdr_gpl.h

@@ -31,6 +31,7 @@ typedef struct shift_addition_data_s
 } shift_addition_data_t;
 shift_addition_data_t shift_addition_init(float rate);
 float shift_addition_cc(complexf *input, complexf* output, int input_size, shift_addition_data_t d, float starting_phase);
+float shift_addition_fc(float *input, complexf* output, int input_size, shift_addition_data_t d, float starting_phase);
 void shift_addition_cc_test(shift_addition_data_t d);
 
 float agc_ff(float* input, float* output, int input_size, float reference, float attack_rate, float decay_rate, float max_gain, short hang_time, short attack_wait_time, float gain_filter_alpha, float last_gain);

nmux-todo.md

@@ -1,7 +0,0 @@
-Remove nmux repo, it will rather be part of csdr
-Try in OpenWebRX
-Add UDP support
-Evaluate performance against ncat
-Remove debug messages
-Document README.md
-Test with a limited number of people

nmux.cpp

@@ -192,7 +192,7 @@ int main(int argc, char* argv[])
 			if(NMUX_DEBUG) 
 			{
 				fprintf(stderr, "\x1b[1m\x1b[33mmainfor: clients before closing: ");
-				for(int i=0;i<clients.size();i++) fprintf(stderr, "0x%x ", (intptr_t)clients[i]);
+				for(int i=0;i<clients.size();i++) fprintf(stderr, "%p ", clients[i]);
 				fprintf(stderr, "\x1b[0m\n");
 			}
 			if(NMUX_DEBUG) fprintf(stderr, "mainfor: accepted (socket = %d).\n", new_socket);
@@ -201,6 +201,12 @@ int main(int argc, char* argv[])
 			{
 				if(clients[i]->status == CS_THREAD_FINISHED)
 				{
+                    if(pthread_detach(clients[i]->thread)!=0)
+                    {
+                        fprintf(stderr,"nmux pthread_detach failed for client %d\n", i);
+                        continue;
+                    }
+
 					if(NMUX_DEBUG) fprintf(stderr, "mainfor: client removed: %d\n", i);
 					//client destructor
 					pool->remove_thread(clients[i]->tsmthread);
@@ -211,7 +217,7 @@ int main(int argc, char* argv[])
 			if(NMUX_DEBUG) 
 			{
 				fprintf(stderr, "\x1b[1m\x1b[33mmainfor: clients after closing: ");
-				for(int i=0;i<clients.size();i++) fprintf(stderr, "0x%x ", (intptr_t)clients[i]);
+				for(int i=0;i<clients.size();i++) fprintf(stderr, "%p ", clients[i]);
 				fprintf(stderr, "\x1b[0m\n");
 			}
 
@@ -227,7 +233,7 @@ int main(int argc, char* argv[])
 			if(pthread_create(&new_client->thread, NULL, client_thread, (void*)new_client)==0)
 			{
 				clients.push_back(new_client);
-				fprintf(stderr, MSG_START "pthread_create() done, clients now: %d\n", clients.size());
+				fprintf(stderr, MSG_START "pthread_create() done, clients now: %d\n", (int)clients.size());
 			}
 			else
 			{
@@ -278,14 +284,14 @@ int main(int argc, char* argv[])
 
 void* client_thread (void* param)
 {
-	fprintf(stderr, "client 0x%x: started!\n", (intptr_t)param);
+	fprintf(stderr, "client %p: started!\n", param);
 	client_t* this_client = (client_t*)param;
 	this_client->status = CS_THREAD_RUNNING;
 	int retval;
 	tsmpool* lpool = this_client->lpool;
-	if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: socket = %d!\n", (intptr_t)param, this_client->socket);
+	if(NMUX_DEBUG) fprintf(stderr, "client %p: socket = %d!\n", param, this_client->socket);
 
-	if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: poll init...", (intptr_t)param);
+	if(NMUX_DEBUG) fprintf(stderr, "client %p: poll init...", param);
 	struct pollfd pollfds[1];
 	pollfds[0].fd = this_client->socket;
 	pollfds[0].events = POLLOUT;
@@ -307,10 +313,10 @@ void* client_thread (void* param)
 		//	(Wait for the server process to wake me up.)
 		while(!pool_read_buffer || client_buffer_index >= lpool->size)
 		{
-			if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: trying to grb\n", (intptr_t)param);
+			if(NMUX_DEBUG) fprintf(stderr, "client %p: trying to grb\n", param);
 			pool_read_buffer = (char*)lpool->get_read_buffer(this_client->tsmthread);
 			if(pool_read_buffer) { client_buffer_index = 0; break; }
-			if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: cond_waiting for more data\n", (intptr_t)param);
+			if(NMUX_DEBUG) fprintf(stderr, "client %p: cond_waiting for more data\n", param);
 			pthread_mutex_lock(&wait_mutex);
 			this_client->sleeping = 1;
 			pthread_cond_wait(&wait_condition, &wait_mutex);
@@ -318,14 +324,14 @@ void* client_thread (void* param)
 		}
 
 		//Wait for the socket to be available for write.
-		if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: polling for socket write...", (intptr_t)param);
+		if(NMUX_DEBUG) fprintf(stderr, "client %p: polling for socket write...", param);
 		int ret = poll(pollfds, 1, -1);
 		if(NMUX_DEBUG) fprintf(stderr, "client polled for socket write.\n");
 		if(ret == 0) continue;
 		else if (ret == -1) { client_goto_source = 1; goto client_thread_exit; }
 
 		//Read data from global tsmpool and write it to client socket
-		if(NMUX_DEBUG) fprintf(stderr, "client 0x%x: sending...", (intptr_t)param);
+		if(NMUX_DEBUG) fprintf(stderr, "client %p: sending...", param);
 		ret = send(this_client->socket, pool_read_buffer + client_buffer_index, lpool->size - client_buffer_index, MSG_NOSIGNAL);
 		if(NMUX_DEBUG) fprintf(stderr, "client sent.\n");
 		if(ret == -1) 
@@ -340,7 +346,7 @@ void* client_thread (void* param)
 	}
 
 client_thread_exit:
-	fprintf(stderr, "client 0x%x: CS_THREAD_FINISHED, client_goto_source = %d, errno = %d", (intptr_t)param, client_goto_source, errno);
+	fprintf(stderr, "client %p: CS_THREAD_FINISHED, client_goto_source = %d, errno = %d", param, client_goto_source, errno);
 	this_client->status = CS_THREAD_FINISHED;
 	pthread_exit(NULL);
 	return NULL;

tsmpool.cpp

@@ -42,7 +42,7 @@ tsmthread_t* tsmpool::register_thread()
 	return thread;
 }
 
-int tsmpool::remove_thread(tsmthread_t* thread)
+void tsmpool::remove_thread(tsmthread_t* thread)
 {
 	pthread_mutex_lock(&this->mutex);
 	for(int i=0;i<threads.size();i++)

tsmpool.h

@@ -36,7 +36,7 @@ public:
 	tsmpool(size_t size, int num);
 	void* get_write_buffer();
 	tsmthread_t* register_thread();
-	int remove_thread(tsmthread_t* thread);
+	void remove_thread(tsmthread_t* thread);
 	void* get_read_buffer(tsmthread_t* thread);
 	int index_next(int index) { return (index+1==num)?0:index+1; }
 	int index_before(int index) { return (index-1<0)?num-1:index-1; }