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/*
* MMX optimized MP3 decoding functions
* Copyright (c) 2010 Vitor Sessak
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/cpu.h"
#include "libavutil/x86_cpu.h"
#define CONFIG_FLOAT 1
#include "libavcodec/mpegaudio.h"
#define MACS(rt, ra, rb) rt+=(ra)*(rb)
#define MLSS(rt, ra, rb) rt-=(ra)*(rb)
#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]); \
}
static void apply_window(const float *buf, const float *win1,
const float *win2, float *sum1, float *sum2, int len)
{
x86_reg count = - 4*len;
const float *win1a = win1+len;
const float *win2a = win2+len;
const float *bufa = buf+len;
float *sum1a = sum1+len;
float *sum2a = sum2+len;
#define MULT(a, b) \
"movaps " #a "(%1,%0), %%xmm1 \n\t" \
"movaps " #a "(%3,%0), %%xmm2 \n\t" \
"mulps %%xmm2, %%xmm1 \n\t" \
"subps %%xmm1, %%xmm0 \n\t" \
"mulps " #b "(%2,%0), %%xmm2 \n\t" \
"subps %%xmm2, %%xmm4 \n\t" \
__asm__ volatile(
"1: \n\t"
"xorps %%xmm0, %%xmm0 \n\t"
"xorps %%xmm4, %%xmm4 \n\t"
MULT( 0, 0)
MULT( 256, 64)
MULT( 512, 128)
MULT( 768, 192)
MULT(1024, 256)
MULT(1280, 320)
MULT(1536, 384)
MULT(1792, 448)
"movaps %%xmm0, (%4,%0) \n\t"
"movaps %%xmm4, (%5,%0) \n\t"
"add $16, %0 \n\t"
"jl 1b \n\t"
:"+&r"(count)
:"r"(win1a), "r"(win2a), "r"(bufa), "r"(sum1a), "r"(sum2a)
);
#undef MULT
}
static void apply_window_mp3(float *in, float *win, int *unused, float *out,
int incr)
{
LOCAL_ALIGNED_16(float, suma, [17]);
LOCAL_ALIGNED_16(float, sumb, [17]);
LOCAL_ALIGNED_16(float, sumc, [17]);
LOCAL_ALIGNED_16(float, sumd, [17]);
float sum;
/* copy to avoid wrap */
memcpy(in + 512, in, 32 * sizeof(*in));
apply_window(in + 16, win , win + 512, suma, sumc, 16);
apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);
SUM8(MACS, suma[0], win + 32, in + 48);
sumc[ 0] = 0;
sumb[16] = 0;
sumd[16] = 0;
#define SUMS(suma, sumb, sumc, sumd, out1, out2) \
"movups " #sumd "(%4), %%xmm0 \n\t" \
"shufps $0x1b, %%xmm0, %%xmm0 \n\t" \
"subps " #suma "(%1), %%xmm0 \n\t" \
"movaps %%xmm0," #out1 "(%0) \n\t" \
\
"movups " #sumc "(%3), %%xmm0 \n\t" \
"shufps $0x1b, %%xmm0, %%xmm0 \n\t" \
"addps " #sumb "(%2), %%xmm0 \n\t" \
"movaps %%xmm0," #out2 "(%0) \n\t"
if (incr == 1) {
__asm__ volatile(
SUMS( 0, 48, 4, 52, 0, 112)
SUMS(16, 32, 20, 36, 16, 96)
SUMS(32, 16, 36, 20, 32, 80)
SUMS(48, 0, 52, 4, 48, 64)
:"+&r"(out)
:"r"(&suma[0]), "r"(&sumb[0]), "r"(&sumc[0]), "r"(&sumd[0])
:"memory"
);
out += 16*incr;
} else {
int j;
float *out2 = out + 32 * incr;
out[0 ] = -suma[ 0];
out += incr;
out2 -= incr;
for(j=1;j<16;j++) {
*out = -suma[ j] + sumd[16-j];
*out2 = sumb[16-j] + sumc[ j];
out += incr;
out2 -= incr;
}
}
sum = 0;
SUM8(MLSS, sum, win + 16 + 32, in + 32);
*out = sum;
}
void ff_mpegaudiodec_init_mmx(MPADecodeContext *s)
{
int mm_flags = av_get_cpu_flags();
if (mm_flags & AV_CPU_FLAG_SSE2) {
s->apply_window_mp3 = apply_window_mp3;
}
}
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