ffmpeg / libavcodec / x86 / mpegaudiodec_mmx.c @ 4eca52ed
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/*


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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 FFmpeg.

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*

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* FFmpeg 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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* FFmpeg 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 FFmpeg; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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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[16j];

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*out2 = sumb[16j] + 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 = mm_support();

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if (mm_flags & FF_MM_SSE2) {

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s>apply_window_mp3 = apply_window_mp3; 
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} 
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} 