mirror of https://github.com/mpv-player/mpv
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
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// this code come from a52dec/libao/audio_out_oss.c
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// FIXME FIXME FIXME
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// a52_resample_init should find the requested converter (from type flags ->
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// given number of channels) and set up some function pointers...
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// a52_resample() should do the conversion.
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#include <inttypes.h>
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#include "a52.h"
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static inline int16_t convert (int32_t i)
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{
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if (i > 0x43c07fff)
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return 32767;
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else if (i < 0x43bf8000)
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return -32768;
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else
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return i - 0x43c00000;
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}
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static int chans=2;
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static int flags=0;
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void a52_resample_init(int _flags,int _chans){
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chans=_chans;
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flags=_flags;
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}
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int a52_resample(float * _f, int16_t * s16)
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{
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int i;
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int32_t * f = (int32_t *) _f;
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switch (flags) {
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case A52_MONO:
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for (i = 0; i < 256; i++) {
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s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert (f[i]);
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}
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break;
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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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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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break;
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case A52_3F:
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for (i = 0; i < 256; i++) {
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s16[5*i] = convert (f[i]);
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s16[5*i+1] = convert (f[i+512]);
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s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert (f[i+256]);
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}
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break;
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case A52_2F2R:
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for (i = 0; i < 256; i++) {
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s16[4*i] = convert (f[i]);
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s16[4*i+1] = convert (f[i+256]);
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s16[4*i+2] = convert (f[i+512]);
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s16[4*i+3] = convert (f[i+768]);
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}
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break;
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case A52_3F2R:
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for (i = 0; i < 256; i++) {
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s16[5*i] = convert (f[i]);
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s16[5*i+1] = convert (f[i+512]);
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s16[5*i+2] = convert (f[i+768]);
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s16[5*i+3] = convert (f[i+1024]);
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s16[5*i+4] = convert (f[i+256]);
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}
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break;
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case A52_MONO | A52_LFE:
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for (i = 0; i < 256; i++) {
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s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert (f[i+256]);
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s16[6*i+5] = convert (f[i]);
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}
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break;
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case A52_CHANNEL | A52_LFE:
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case A52_STEREO | A52_LFE:
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case A52_DOLBY | A52_LFE:
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+512]);
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s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
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s16[6*i+5] = convert (f[i]);
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}
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break;
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case A52_3F | A52_LFE:
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+768]);
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s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert (f[i+512]);
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s16[6*i+5] = convert (f[i]);
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}
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break;
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case A52_2F2R | A52_LFE:
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+512]);
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s16[6*i+2] = convert (f[i+768]);
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s16[6*i+3] = convert (f[i+1024]);
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s16[6*i+4] = 0;
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s16[6*i+5] = convert (f[i]);
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}
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break;
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case A52_3F2R | A52_LFE:
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+768]);
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s16[6*i+2] = convert (f[i+1024]);
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s16[6*i+3] = convert (f[i+1280]);
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s16[6*i+4] = convert (f[i+512]);
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s16[6*i+5] = convert (f[i]);
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}
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break;
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}
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return chans*256;
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}
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