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