mirror of https://github.com/mpv-player/mpv
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
// this code is based on a52dec/libao/audio_out_oss.c
|
|
// AltiVec support Copyright (c) 2004 Romain Dolbeau <romain@dolbeau.org>
|
|
|
|
#ifndef SYS_DARWIN
|
|
#include <altivec.h>
|
|
#endif
|
|
|
|
const vector signed int magic = {0x43c00000,0x43c00000,0x43c00000,0x43c00000};
|
|
|
|
static inline vector signed short convert16_altivec(vector signed int v1, vector signed int v2)
|
|
{
|
|
register vector signed short result;
|
|
v1 = vec_subs(v1, magic);
|
|
v2 = vec_subs(v2, magic);
|
|
result = vec_packs(v1, v2);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void unaligned_store(vector signed short value, int off, int16_t *dst)
|
|
{
|
|
register vector unsigned char align = vec_lvsr(0, dst),
|
|
mask = vec_lvsl(0, dst);
|
|
register vector signed short t0,t1, edges;
|
|
|
|
t0 = vec_ld(0+off, dst);
|
|
t1 = vec_ld(15+off, dst);
|
|
edges = vec_perm(t1 ,t0, mask);
|
|
t1 = vec_perm(value, edges, align);
|
|
t0 = vec_perm(edges, value, align);
|
|
vec_st(t1, 15+off, dst);
|
|
vec_st(t0, 0+off, dst);
|
|
}
|
|
|
|
static int a52_resample_STEREO_to_2_altivec(float * _f, int16_t * s16){
|
|
#if 0
|
|
int i;
|
|
int32_t * f = (int32_t *) _f;
|
|
for (i = 0; i < 256; i++) {
|
|
s16[2*i] = convert (f[i]);
|
|
s16[2*i+1] = convert (f[i+256]);
|
|
}
|
|
return 2*256;
|
|
#else
|
|
int i = 0;
|
|
int32_t * f = (int32_t *) _f;
|
|
register vector signed int f0, f4, f256, f260;
|
|
register vector signed short reven, rodd, r0, r1;
|
|
|
|
for (i = 0; i < 256; i+= 8) {
|
|
f0 = vec_ld(0, f);
|
|
f4 = vec_ld(16, f);
|
|
|
|
f256 = vec_ld(1024, f);
|
|
f260 = vec_ld(1040, f);
|
|
|
|
reven = convert16_altivec(f0, f4);
|
|
rodd = convert16_altivec(f256, f260);
|
|
|
|
r0 = vec_mergeh(reven, rodd);
|
|
r1 = vec_mergel(reven, rodd);
|
|
// FIXME can be merged to spare some I/O
|
|
unaligned_store(r0, 0, s16);
|
|
unaligned_store(r1, 16, s16);
|
|
|
|
f += 8;
|
|
s16 += 16;
|
|
}
|
|
return(2*256);
|
|
#endif
|
|
}
|
|
|
|
static void* a52_resample_altivec(int flags, int ch){
|
|
fprintf(stderr, "Checking for AltiVec resampler : 0x%08x, %d\n", flags, ch);
|
|
|
|
switch (flags) {
|
|
case A52_CHANNEL:
|
|
case A52_STEREO:
|
|
case A52_DOLBY:
|
|
if(ch==2) return a52_resample_STEREO_to_2_altivec;
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "Unsupported flags: 0x%08x (%d channels)\n", flags, ch);
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|