/* * Copyright (c) 2001, 2002 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/mem.h" #include "dct32.h" #include "mathops.h" #include "mpegaudiodsp.h" #include "mpegaudio.h" #include "mpegaudiodata.h" #if CONFIG_FLOAT #define RENAME(n) n##_float static inline float round_sample(float *sum) { float sum1=*sum; *sum = 0; return sum1; } #define MACS(rt, ra, rb) rt+=(ra)*(rb) #define MULS(ra, rb) ((ra)*(rb)) #define MLSS(rt, ra, rb) rt-=(ra)*(rb) #else #define RENAME(n) n##_fixed #define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15) static inline int round_sample(int64_t *sum) { int sum1; sum1 = (int)((*sum) >> OUT_SHIFT); *sum &= (1<<OUT_SHIFT)-1; return av_clip_int16(sum1); } # define MULS(ra, rb) MUL64(ra, rb) # define MACS(rt, ra, rb) MAC64(rt, ra, rb) # define MLSS(rt, ra, rb) MLS64(rt, ra, rb) #endif DECLARE_ALIGNED(16, MPA_INT, RENAME(ff_mpa_synth_window))[512+256]; #define SUM8(op, sum, w, p) \ { \ op(sum, (w)[0 * 64], (p)[0 * 64]); \ op(sum, (w)[1 * 64], (p)[1 * 64]); \ op(sum, (w)[2 * 64], (p)[2 * 64]); \ op(sum, (w)[3 * 64], (p)[3 * 64]); \ op(sum, (w)[4 * 64], (p)[4 * 64]); \ op(sum, (w)[5 * 64], (p)[5 * 64]); \ op(sum, (w)[6 * 64], (p)[6 * 64]); \ op(sum, (w)[7 * 64], (p)[7 * 64]); \ } #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \ { \ INTFLOAT tmp;\ tmp = p[0 * 64];\ op1(sum1, (w1)[0 * 64], tmp);\ op2(sum2, (w2)[0 * 64], tmp);\ tmp = p[1 * 64];\ op1(sum1, (w1)[1 * 64], tmp);\ op2(sum2, (w2)[1 * 64], tmp);\ tmp = p[2 * 64];\ op1(sum1, (w1)[2 * 64], tmp);\ op2(sum2, (w2)[2 * 64], tmp);\ tmp = p[3 * 64];\ op1(sum1, (w1)[3 * 64], tmp);\ op2(sum2, (w2)[3 * 64], tmp);\ tmp = p[4 * 64];\ op1(sum1, (w1)[4 * 64], tmp);\ op2(sum2, (w2)[4 * 64], tmp);\ tmp = p[5 * 64];\ op1(sum1, (w1)[5 * 64], tmp);\ op2(sum2, (w2)[5 * 64], tmp);\ tmp = p[6 * 64];\ op1(sum1, (w1)[6 * 64], tmp);\ op2(sum2, (w2)[6 * 64], tmp);\ tmp = p[7 * 64];\ op1(sum1, (w1)[7 * 64], tmp);\ op2(sum2, (w2)[7 * 64], tmp);\ } void RENAME(ff_mpadsp_apply_window)(MPA_INT *synth_buf, MPA_INT *window, int *dither_state, OUT_INT *samples, int incr) { register const MPA_INT *w, *w2, *p; int j; OUT_INT *samples2; #if CONFIG_FLOAT float sum, sum2; #else int64_t sum, sum2; #endif /* copy to avoid wrap */ memcpy(synth_buf + 512, synth_buf, 32 * sizeof(*synth_buf)); samples2 = samples + 31 * incr; w = window; w2 = window + 31; sum = *dither_state; p = synth_buf + 16; SUM8(MACS, sum, w, p); p = synth_buf + 48; SUM8(MLSS, sum, w + 32, p); *samples = round_sample(&sum); samples += incr; w++; /* we calculate two samples at the same time to avoid one memory access per two sample */ for(j=1;j<16;j++) { sum2 = 0; p = synth_buf + 16 + j; SUM8P2(sum, MACS, sum2, MLSS, w, w2, p); p = synth_buf + 48 - j; SUM8P2(sum, MLSS, sum2, MLSS, w + 32, w2 + 32, p); *samples = round_sample(&sum); samples += incr; sum += sum2; *samples2 = round_sample(&sum); samples2 -= incr; w++; w2--; } p = synth_buf + 32; SUM8(MLSS, sum, w + 32, p); *samples = round_sample(&sum); *dither_state= sum; } /* 32 sub band synthesis filter. Input: 32 sub band samples, Output: 32 samples. */ void RENAME(ff_mpa_synth_filter)(MPADSPContext *s, MPA_INT *synth_buf_ptr, int *synth_buf_offset, MPA_INT *window, int *dither_state, OUT_INT *samples, int incr, MPA_INT *sb_samples) { MPA_INT *synth_buf; int offset; offset = *synth_buf_offset; synth_buf = synth_buf_ptr + offset; s->RENAME(dct32)(synth_buf, sb_samples); s->RENAME(apply_window)(synth_buf, window, dither_state, samples, incr); offset = (offset - 32) & 511; *synth_buf_offset = offset; } void av_cold RENAME(ff_mpa_synth_init)(MPA_INT *window) { int i, j; /* max = 18760, max sum over all 16 coefs : 44736 */ for(i=0;i<257;i++) { INTFLOAT v; v = ff_mpa_enwindow[i]; #if CONFIG_FLOAT v *= 1.0 / (1LL<<(16 + FRAC_BITS)); #endif window[i] = v; if ((i & 63) != 0) v = -v; if (i != 0) window[512 - i] = v; } // Needed for avoiding shuffles in ASM implementations for(i=0; i < 8; i++) for(j=0; j < 16; j++) window[512+16*i+j] = window[64*i+32-j]; for(i=0; i < 8; i++) for(j=0; j < 16; j++) window[512+128+16*i+j] = window[64*i+48-j]; }