mirror of
https://github.com/FFmpeg/FFmpeg.git
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142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/*
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* Altivec optimized MP3 decoding functions
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* Copyright (c) 2010 Vitor Sessak
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/internal.h"
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#include "libavutil/ppc/cpu.h"
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#include "libavutil/ppc/util_altivec.h"
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#include "libavcodec/mpegaudiodsp.h"
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#if HAVE_ALTIVEC
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#define MACS(rt, ra, rb) rt+=(ra)*(rb)
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#define MLSS(rt, ra, rb) rt-=(ra)*(rb)
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#define SUM8(op, sum, w, p) \
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{ \
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op(sum, (w)[0 * 64], (p)[0 * 64]); \
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op(sum, (w)[1 * 64], (p)[1 * 64]); \
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op(sum, (w)[2 * 64], (p)[2 * 64]); \
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op(sum, (w)[3 * 64], (p)[3 * 64]); \
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op(sum, (w)[4 * 64], (p)[4 * 64]); \
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op(sum, (w)[5 * 64], (p)[5 * 64]); \
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op(sum, (w)[6 * 64], (p)[6 * 64]); \
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op(sum, (w)[7 * 64], (p)[7 * 64]); \
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}
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static void apply_window(const float *buf, const float *win1,
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const float *win2, float *sum1, float *sum2, int len)
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{
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const vector float *win1a = (const vector float *) win1;
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const vector float *win2a = (const vector float *) win2;
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const vector float *bufa = (const vector float *) buf;
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vector float *sum1a = (vector float *) sum1;
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vector float *sum2a = (vector float *) sum2;
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vector float av_uninit(v0), av_uninit(v4);
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vector float v1, v2, v3;
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len = len >> 2;
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#define MULT(a, b) \
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{ \
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v1 = vec_ld(a, win1a); \
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v2 = vec_ld(b, win2a); \
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v3 = vec_ld(a, bufa); \
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v0 = vec_madd(v3, v1, v0); \
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v4 = vec_madd(v2, v3, v4); \
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}
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while (len--) {
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v0 = vec_xor(v0, v0);
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v4 = vec_xor(v4, v4);
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MULT( 0, 0);
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MULT( 256, 64);
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MULT( 512, 128);
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MULT( 768, 192);
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MULT(1024, 256);
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MULT(1280, 320);
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MULT(1536, 384);
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MULT(1792, 448);
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vec_st(v0, 0, sum1a);
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vec_st(v4, 0, sum2a);
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sum1a++;
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sum2a++;
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win1a++;
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win2a++;
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bufa++;
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}
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}
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static void apply_window_mp3(float *in, float *win, int *unused, float *out,
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int incr)
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{
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LOCAL_ALIGNED_16(float, suma, [17]);
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LOCAL_ALIGNED_16(float, sumb, [17]);
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LOCAL_ALIGNED_16(float, sumc, [17]);
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LOCAL_ALIGNED_16(float, sumd, [17]);
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float sum;
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int j;
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float *out2 = out + 32 * incr;
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/* copy to avoid wrap */
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memcpy(in + 512, in, 32 * sizeof(*in));
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apply_window(in + 16, win , win + 512, suma, sumc, 16);
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apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);
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SUM8(MLSS, suma[0], win + 32, in + 48);
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sumc[ 0] = 0;
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sumb[16] = 0;
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sumd[16] = 0;
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out[0 ] = suma[ 0];
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out += incr;
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out2 -= incr;
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for(j=1;j<16;j++) {
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*out = suma[ j] - sumd[16-j];
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*out2 = -sumb[16-j] - sumc[ j];
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out += incr;
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out2 -= incr;
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}
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sum = 0;
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SUM8(MLSS, sum, win + 16 + 32, in + 32);
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*out = sum;
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}
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)
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{
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#if HAVE_ALTIVEC
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if (!PPC_ALTIVEC(av_get_cpu_flags()))
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return;
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s->apply_window_float = apply_window_mp3;
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#endif /* HAVE_ALTIVEC */
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}
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