+++ /dev/null
-/* 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);
- }
-}
-
projects / 16.git / blobdiff