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/*
* Altivec 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 "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/internal.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/ppc/util_altivec.h"
#include "libavcodec/mpegaudiodsp.h"
#if HAVE_ALTIVEC && HAVE_BIGENDIAN
#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)
{
const vector float *win1a = (const vector float *) win1;
const vector float *win2a = (const vector float *) win2;
const vector float *bufa = (const vector float *) buf;
vector float *sum1a = (vector float *) sum1;
vector float *sum2a = (vector float *) sum2;
vector float av_uninit(v0), av_uninit(v4);
vector float v1, v2, v3;
len = len >> 2;
#define MULT(a, b) \
{ \
v1 = vec_ld(a, win1a); \
v2 = vec_ld(b, win2a); \
v3 = vec_ld(a, bufa); \
v0 = vec_madd(v3, v1, v0); \
v4 = vec_madd(v2, v3, v4); \
}
while (len--) {
v0 = vec_xor(v0, v0);
v4 = vec_xor(v4, v4);
MULT( 0, 0);
MULT( 256, 64);
MULT( 512, 128);
MULT( 768, 192);
MULT(1024, 256);
MULT(1280, 320);
MULT(1536, 384);
MULT(1792, 448);
vec_st(v0, 0, sum1a);
vec_st(v4, 0, sum2a);
sum1a++;
sum2a++;
win1a++;
win2a++;
bufa++;
}
}
static void apply_window_mp3(float *in, float *win, int *unused, float *out,
ptrdiff_t 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;
int j;
float *out2 = out + 32 * incr;
/* 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(MLSS, suma[0], win + 32, in + 48);
sumc[ 0] = 0;
sumb[16] = 0;
sumd[16] = 0;
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;
}
#endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)
{
#if HAVE_ALTIVEC && HAVE_BIGENDIAN
if (!PPC_ALTIVEC(av_get_cpu_flags()))
return;
s->apply_window_float = apply_window_mp3;
#endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
}
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