| /* 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); |
| } |
| } |
| |