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Diffstat (limited to 'code/libspeex/lpc_bfin.h')
| -rw-r--r-- | code/libspeex/lpc_bfin.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/code/libspeex/lpc_bfin.h b/code/libspeex/lpc_bfin.h new file mode 100644 index 0000000..7310ffb --- /dev/null +++ b/code/libspeex/lpc_bfin.h @@ -0,0 +1,131 @@ +/* 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); + } +} + |