mirror of https://github.com/mpv-player/mpv
78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "ad_internal.h"
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static ad_info_t info =
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{
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"Uncompressed DVD/VOB LPCM audio decoder",
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"dvdpcm",
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"Nick Kurshev",
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"A'rpi",
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""
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};
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LIBAD_EXTERN(dvdpcm)
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static int init(sh_audio_t *sh)
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{
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/* DVD PCM Audio:*/
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if(sh->codecdata_len==3){
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// we have LPCM header:
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unsigned char h=sh->codecdata[1];
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sh->channels=1+(h&7);
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switch((h>>4)&3){
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case 0: sh->samplerate=48000;break;
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case 1: sh->samplerate=96000;break;
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case 2: sh->samplerate=44100;break;
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case 3: sh->samplerate=32000;break;
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}
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} else {
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// use defaults:
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sh->channels=2;
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sh->samplerate=48000;
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}
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sh->i_bps=2*sh->channels*sh->samplerate;
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return 1;
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}
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static int preinit(sh_audio_t *sh)
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{
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sh->audio_out_minsize=2048;
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return 1;
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}
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static void uninit(sh_audio_t *sh)
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{
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}
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static int control(sh_audio_t *sh,int cmd,void* arg, ...)
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{
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int skip;
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switch(cmd)
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{
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case ADCTRL_SKIP_FRAME:
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skip=sh->i_bps/16;
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skip=skip&(~3);
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demux_read_data(sh->ds,NULL,skip);
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return CONTROL_TRUE;
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}
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return CONTROL_UNKNOWN;
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}
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static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
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{
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int j,len;
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len=demux_read_data(sh_audio->ds,buf,(minlen+3)&(~3));
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#ifndef WORDS_BIGENDIAN
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for(j=0;j<len;j+=2){
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char x=buf[j];
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buf[j]=buf[j+1];
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buf[j+1]=x;
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}
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#endif
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return len;
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}
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