mirror of
https://github.com/FFmpeg/FFmpeg.git
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159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
/*
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* MMX 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 "libavutil/cpu.h"
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#include "libavutil/x86_cpu.h"
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#define CONFIG_FLOAT 1
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#include "libavcodec/mpegaudio.h"
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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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x86_reg count = - 4*len;
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const float *win1a = win1+len;
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const float *win2a = win2+len;
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const float *bufa = buf+len;
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float *sum1a = sum1+len;
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float *sum2a = sum2+len;
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#define MULT(a, b) \
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"movaps " #a "(%1,%0), %%xmm1 \n\t" \
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"movaps " #a "(%3,%0), %%xmm2 \n\t" \
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"mulps %%xmm2, %%xmm1 \n\t" \
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"subps %%xmm1, %%xmm0 \n\t" \
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"mulps " #b "(%2,%0), %%xmm2 \n\t" \
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"subps %%xmm2, %%xmm4 \n\t" \
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__asm__ volatile(
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"1: \n\t"
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"xorps %%xmm0, %%xmm0 \n\t"
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"xorps %%xmm4, %%xmm4 \n\t"
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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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"movaps %%xmm0, (%4,%0) \n\t"
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"movaps %%xmm4, (%5,%0) \n\t"
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"add $16, %0 \n\t"
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"jl 1b \n\t"
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:"+&r"(count)
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:"r"(win1a), "r"(win2a), "r"(bufa), "r"(sum1a), "r"(sum2a)
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);
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#undef MULT
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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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/* 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(MACS, 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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#define SUMS(suma, sumb, sumc, sumd, out1, out2) \
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"movups " #sumd "(%4), %%xmm0 \n\t" \
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"shufps $0x1b, %%xmm0, %%xmm0 \n\t" \
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"subps " #suma "(%1), %%xmm0 \n\t" \
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"movaps %%xmm0," #out1 "(%0) \n\t" \
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\
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"movups " #sumc "(%3), %%xmm0 \n\t" \
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"shufps $0x1b, %%xmm0, %%xmm0 \n\t" \
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"addps " #sumb "(%2), %%xmm0 \n\t" \
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"movaps %%xmm0," #out2 "(%0) \n\t"
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if (incr == 1) {
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__asm__ volatile(
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SUMS( 0, 48, 4, 52, 0, 112)
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SUMS(16, 32, 20, 36, 16, 96)
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SUMS(32, 16, 36, 20, 32, 80)
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SUMS(48, 0, 52, 4, 48, 64)
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:"+&r"(out)
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:"r"(&suma[0]), "r"(&sumb[0]), "r"(&sumc[0]), "r"(&sumd[0])
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:"memory"
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);
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out += 16*incr;
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} else {
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int j;
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float *out2 = out + 32 * incr;
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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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}
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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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void ff_mpegaudiodec_init_mmx(MPADecodeContext *s)
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{
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int mm_flags = av_get_cpu_flags();
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if (mm_flags & AV_CPU_FLAG_SSE2) {
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s->apply_window_mp3 = apply_window_mp3;
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}
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}
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