131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/* Copyright (C) 2005 Analog Devices */
|
|
/**
|
|
@file lpc_bfin.h
|
|
@author Jean-Marc Valin
|
|
@brief Functions for LPC (Linear Prediction Coefficients) analysis (Blackfin version)
|
|
*/
|
|
/*
|
|
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 Xiph.org Foundation 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 FOUNDATION OR
|
|
CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#define OVERRIDE_SPEEX_AUTOCORR
|
|
void _spx_autocorr(
|
|
const spx_word16_t *x, /* in: [0...n-1] samples x */
|
|
spx_word16_t *ac, /* out: [0...lag-1] ac values */
|
|
int lag,
|
|
int n
|
|
)
|
|
{
|
|
spx_word32_t d;
|
|
const spx_word16_t *xs;
|
|
int i, j;
|
|
spx_word32_t ac0=1;
|
|
spx_word32_t ac32[11], *ac32top;
|
|
int shift, ac_shift;
|
|
ac32top = ac32+lag-1;
|
|
int lag_1, N_lag;
|
|
int nshift;
|
|
lag_1 = lag-1;
|
|
N_lag = n-lag_1;
|
|
for (j=0;j<n;j++)
|
|
ac0 = ADD32(ac0,SHR32(MULT16_16(x[j],x[j]),8));
|
|
ac0 = ADD32(ac0,n);
|
|
shift = 8;
|
|
while (shift && ac0<0x40000000)
|
|
{
|
|
shift--;
|
|
ac0 <<= 1;
|
|
}
|
|
ac_shift = 18;
|
|
while (ac_shift && ac0<0x40000000)
|
|
{
|
|
ac_shift--;
|
|
ac0 <<= 1;
|
|
}
|
|
|
|
xs = x+lag-1;
|
|
nshift = -shift;
|
|
__asm__ __volatile__
|
|
(
|
|
"P2 = %0;\n\t"
|
|
"I0 = P2;\n\t" /* x in I0 */
|
|
"B0 = P2;\n\t" /* x in B0 */
|
|
"R0 = %3;\n\t" /* len in R0 */
|
|
"P3 = %3;\n\t" /* len in R0 */
|
|
"P4 = %4;\n\t" /* nb_pitch in R0 */
|
|
"R1 = R0 << 1;\n\t" /* number of bytes in x */
|
|
"L0 = R1;\n\t"
|
|
"P0 = %1;\n\t"
|
|
"P1 = %2;\n\t"
|
|
"B1 = P1;\n\t"
|
|
"R4 = %5;\n\t"
|
|
"L1 = 0;\n\t" /*Disable looping on I1*/
|
|
|
|
"r0 = [I0++];\n\t"
|
|
"R2 = 0;R3=0;"
|
|
"LOOP pitch%= LC0 = P4 >> 1;\n\t"
|
|
"LOOP_BEGIN pitch%=;\n\t"
|
|
"I1 = P0;\n\t"
|
|
"A1 = A0 = 0;\n\t"
|
|
"R1 = [I1++];\n\t"
|
|
"LOOP inner_prod%= LC1 = P3 >> 1;\n\t"
|
|
"LOOP_BEGIN inner_prod%=;\n\t"
|
|
"A1 += R0.L*R1.H, A0 += R0.L*R1.L (IS) || R1.L = W[I1++];\n\t"
|
|
"A1 += R0.H*R1.L, A0 += R0.H*R1.H (IS) || R1.H = W[I1++] || R0 = [I0++];\n\t"
|
|
"LOOP_END inner_prod%=;\n\t"
|
|
"A0 = ASHIFT A0 by R4.L;\n\t"
|
|
"A1 = ASHIFT A1 by R4.L;\n\t"
|
|
|
|
"R2 = A0, R3 = A1;\n\t"
|
|
"[P1--] = R2;\n\t"
|
|
"[P1--] = R3;\n\t"
|
|
"P0 += 4;\n\t"
|
|
"LOOP_END pitch%=;\n\t"
|
|
: : "m" (xs), "m" (x), "m" (ac32top), "m" (N_lag), "m" (lag_1), "m" (nshift)
|
|
: "A0", "A1", "P0", "P1", "P2", "P3", "P4", "R0", "R1", "R2", "R3", "R4", "I0", "I1", "L0", "L1", "B0", "B1", "memory"
|
|
);
|
|
d=0;
|
|
for (j=0;j<n;j++)
|
|
{
|
|
d = ADD32(d,SHR32(MULT16_16(x[j],x[j]), shift));
|
|
}
|
|
ac32[0] = d;
|
|
|
|
for (i=0;i<lag;i++)
|
|
{
|
|
d=0;
|
|
for (j=i;j<lag_1;j++)
|
|
{
|
|
d = ADD32(d,SHR32(MULT16_16(x[j],x[j-i]), shift));
|
|
}
|
|
if (i)
|
|
ac32[i] += d;
|
|
ac[i] = SHR32(ac32[i], ac_shift);
|
|
}
|
|
}
|
|
|