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