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Altivec optimized stereo resampler by Romain Dolbeau (made it working under Linux myself)

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@11850 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
alex 2004-01-25 18:29:11 +00:00
parent aecc31b2ca
commit ef74eff3e8
2 changed files with 89 additions and 1 deletions
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16
liba52/resample.c
View File

@ -19,6 +19,10 @@ int (* a52_resample) (float * _f, int16_t * s16)=NULL;
#include "resample_mmx.c"
#endif
#ifdef HAVE_ALTIVEC
#include "resample_altivec.c"
#endif
void* a52_resample_init(uint32_t mm_accel,int flags,int chans){
void* tmp;
@ -32,7 +36,17 @@ void* tmp;
}
}
#endif
#ifdef HAVE_ALTIVEC
if(mm_accel&MM_ACCEL_PPC_ALTIVEC){
tmp=a52_resample_altivec(flags,chans);
if(tmp){
if(a52_resample==NULL) fprintf(stderr, "Using AltiVec optimized resampler\n");
a52_resample=tmp;
return tmp;
}
}
#endif
tmp=a52_resample_C(flags,chans);
if(tmp){
if(a52_resample==NULL) fprintf(stderr, "No accelerated resampler found\n");

74
liba52/resample_altivec.c Normal file
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@ -0,0 +1,74 @@
// 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 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);
vec_st(r0, 0, s16);
vec_st(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;
}