scrape -> scrap, fixed shift_math_cc, found a bug at fastddc.c line 68 which still waits to be fixed

csdr.c

@@ -452,6 +452,7 @@ int main(int argc, char *argv[])
 		{
 			FEOF_CHECK;
 			if(!FREAD_C) break;
+			starting_phase=shift_math_cc((complexf*)input_buffer, (complexf*)output_buffer, the_bufsize, rate, starting_phase);
 			FWRITE_C;
 			TRY_YIELD;
 		}
@@ -1663,7 +1664,7 @@ int main(int argc, char *argv[])
 
 		fastddc_t ddc; 
 		if(fastddc_init(&ddc, transition_bw, decimation, 0)) { badsyntax("error in fastddc_init()"); return 1; }
-		fastddc_print(&ddc);
+		fastddc_print(&ddc,"fastddc_fwd_cc");
 
 		if(!initialize_buffers()) return -2;
 		sendbufsize(ddc.fft_size);
@@ -1686,8 +1687,8 @@ int main(int argc, char *argv[])
 			//overlapped FFT
 			for(int i=0;i<ddc.overlap_length;i++) input[i]=input[i+ddc.input_size];
 			fread(input+ddc.overlap_length, sizeof(complexf), ddc.input_size, stdin);
-			apply_window_c(input,windowed,ddc.fft_size,window);
+			//apply_window_c(input,windowed,ddc.fft_size,window);
-			//memcpy(windowed, input, ddc.fft_size*sizeof(complexf)); //we can switch off windows
+			memcpy(windowed, input, ddc.fft_size*sizeof(complexf)); //we can switch off windows; TODO: it is likely that we shouldn't apply a window to both the FFT and the filter.
 			fft_execute(plan);
 			fwrite(output, sizeof(complexf), ddc.fft_size, stdout);
 			TRY_YIELD;
@@ -1712,7 +1713,7 @@ int main(int argc, char *argv[])
 
 		fastddc_t ddc; 
 		if(fastddc_init(&ddc, transition_bw, decimation, shift_rate)) { badsyntax("error in fastddc_init()"); return 1; }
-		fastddc_print(&ddc);
+		fastddc_print(&ddc,"fastddc_inv_cc");
 
 		if(!initialize_buffers()) return -2;
 		sendbufsize(ddc.post_input_size/ddc.post_decimation); //TODO not exactly correct

fastddc.c

@@ -56,33 +56,36 @@ int fastddc_init(fastddc_t* ddc, float transition_bw, int decimation, float shif
 	ddc->v = ddc->fft_size/ddc->overlap_length; //+-1 ? (or maybe ceil() this?) //TODO: why?
 	int middlebin=ddc->fft_size / 2;
 	ddc->startbin = middlebin + middlebin * shift_rate * 2;	
+	//fprintf(stderr, "ddc->startbin=%g\n",(float)ddc->startbin);
 	ddc->startbin = ddc->v * round( ddc->startbin / (float)ddc->v );
+	//fprintf(stderr, "ddc->startbin=%g\n",(float)ddc->startbin);
 	ddc->offsetbin = ddc->startbin - middlebin;
 	ddc->post_shift = shift_rate-((float)ddc->offsetbin/ddc->fft_size);
 	ddc->pre_shift = ddc->offsetbin/(float)ddc->fft_size;
+	ddc->dsadata = decimating_shift_addition_init(ddc->post_shift, ddc->post_decimation);
 
-	//Overlap is scraped, not added
+	//Overlap is scrapd, not added
-	ddc->scrape=ddc->overlap_length/ddc->pre_decimation;
+	ddc->scrap=ddc->overlap_length/ddc->pre_decimation; //TODO this is problematic sometimes! overlap_length = 401 :: scrap = 200
-	ddc->post_input_size=ddc->fft_inv_size-ddc->scrape;
+	ddc->post_input_size=ddc->fft_inv_size-ddc->scrap;
 
 	return ddc->fft_size<=2; //returns true on error
 }
 
 
-void fastddc_print(fastddc_t* ddc)
+void fastddc_print(fastddc_t* ddc, char* source)
 {
 	fprintf(stderr,
-		"fastddc_print_sizes(): (fft_size = %d) = (taps_length = %d) + (input_size = %d) - 1\n"
+		"%s: fastddc_print_sizes(): (fft_size = %d) = (taps_length = %d) + (input_size = %d) - 1\n"
 		"  overlap     ::  (overlap_length = %d) = taps_length - 1, taps_real_length = %d\n"
 		"  decimation  ::  decimation = (pre_decimation = %d) * (post_decimation = %d), fft_inv_size = %d\n"
 		"  shift       ::  startbin = %d, offsetbin = %d, v = %d, pre_shift = %g, post_shift = %g\n"
-		"  o&s         ::  post_input_size = %d, scrape = %d\n"
+		"  o&s         ::  post_input_size = %d, scrap = %d\n"
 		, 
-		ddc->fft_size, ddc->taps_length, ddc->input_size, 
+		source, ddc->fft_size, ddc->taps_length, ddc->input_size, 
 		ddc->overlap_length, ddc->taps_real_length,
 		ddc->pre_decimation, ddc->post_decimation, ddc->fft_inv_size,
 		ddc->startbin, ddc->offsetbin, ddc->v, ddc->pre_shift, ddc->post_shift, 
-		ddc->post_input_size, ddc->scrape );
+		ddc->post_input_size, ddc->scrap );
 }
 
 void fft_swap_sides(complexf* io, int fft_size)
@@ -102,7 +105,7 @@ void fft_swap_sides(complexf* io, int fft_size)
 
 decimating_shift_addition_status_t fastddc_inv_cc(complexf* input, complexf* output, fastddc_t* ddc, FFT_PLAN_T* plan_inverse, complexf* taps_fft, decimating_shift_addition_status_t shift_stat)
 {
-	//implements DDC by using the overlap & scrape method
+	//implements DDC by using the overlap & scrap method
 	//TODO: +/-1s on overlap_size et al
 	//input shoud have ddc->fft_size number of elements
 
@@ -135,11 +138,9 @@ decimating_shift_addition_status_t fastddc_inv_cc(complexf* input, complexf* out
 		qof(inv_output,i)/=plan_inverse->size;
 	}
 	
-	//Overlap is scraped, not added
+	//Overlap is scrapped, not added
 	//Shift correction
-	shift_addition_data_t dsadata=decimating_shift_addition_init(ddc->post_shift, ddc->post_decimation); //this could be optimized (passed as parameter), but we would not win too much at all 
+	shift_stat=decimating_shift_addition_cc(inv_output+ddc->scrap, output, ddc->post_input_size, ddc->dsadata, ddc->post_decimation, shift_stat);
-	shift_stat=decimating_shift_addition_cc(inv_output+ddc->scrape, output, ddc->post_input_size, dsadata, ddc->post_decimation, shift_stat);
+	//memcpy(inv_output+ddc->scrap, output
-	
-	//memcpy(inv_output+ddc->scrape,  
 	return shift_stat;
 }

fastddc.h

@@ -19,9 +19,10 @@ typedef struct fastddc_s
 	int offsetbin;
 	float post_shift;
 	int output_scrape;
-	int scrape;
+	int scrap;
+	shift_addition_data_t dsadata;
 } fastddc_t;
 
 int fastddc_init(fastddc_t* ddc, float transition_bw, int decimation, float shift_rate);
 decimating_shift_addition_status_t fastddc_inv_cc(complexf* input, complexf* output, fastddc_t* ddc, FFT_PLAN_T* plan_inverse, complexf* taps_fft, decimating_shift_addition_status_t shift_stat);
-void fastddc_print(fastddc_t* ddc);
+void fastddc_print(fastddc_t* ddc, char* source);

grc_tests/test_bandpass_fir_fft.grc

@@ -155,6 +155,61 @@
       <value>24e3</value>
     </param>
   </block>
+  <block>
+    <key>analog_noise_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>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(112, 219)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_noise_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+  </block>
   <block>
     <key>analog_sig_source_x</key>
     <param>
@@ -175,7 +230,7 @@
     </param>
     <param>
       <key>_enabled</key>
-      <value>True</value>
+      <value>1</value>
     </param>
     <param>
       <key>freq</key>
@@ -281,7 +336,7 @@
     </param>
     <param>
       <key>commandline</key>
-      <value>csdr bandpass_fir_fft_cc 0.1 0.5 0.05 HAMMING</value>
+      <value>csdr bandpass_fir_fft_cc 0.1 0.3 0.05 HAMMING</value>
     </param>
     <param>
       <key>comment</key>
@@ -786,6 +841,12 @@
       <value>Counts</value>
     </param>
   </block>
+  <connection>
+    <source_block_id>analog_noise_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>analog_sig_source_x_0</source_block_id>
     <sink_block_id>blocks_throttle_0</sink_block_id>