mirror of https://github.com/mpv-player/mpv
86 lines
2.0 KiB
C
86 lines
2.0 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 PCM audio decoder",
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"pcm",
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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(pcm)
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static int init(sh_audio_t *sh_audio)
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{
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WAVEFORMATEX *h=sh_audio->wf;
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sh_audio->i_bps=h->nAvgBytesPerSec;
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sh_audio->channels=h->nChannels;
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sh_audio->samplerate=h->nSamplesPerSec;
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sh_audio->samplesize=(h->wBitsPerSample+7)/8;
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switch(sh_audio->format){ /* hardware formats: */
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case 0x6: sh_audio->sample_format=AFMT_A_LAW;break;
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case 0x7: sh_audio->sample_format=AFMT_MU_LAW;break;
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case 0x11: sh_audio->sample_format=AFMT_IMA_ADPCM;break;
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case 0x50: sh_audio->sample_format=AFMT_MPEG;break;
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/* case 0x2000: sh_audio->sample_format=AFMT_AC3; */
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case 0x736F7774: // 'twos'
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case 0x74776F73: // 'swot'
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if(sh_audio->samplesize==1) sh_audio->sample_format=AFMT_S8;
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sh_audio->ds->ss_div= sh_audio->samplesize;
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sh_audio->ds->ss_mul= sh_audio->samplesize * sh_audio->channels;
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break;
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default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AFMT_U8;
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}
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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 len=sh_audio->channels*sh_audio->samplesize-1;
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len=(minlen+len)&(~len); // sample align
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len=demux_read_data(sh_audio->ds,buf,len);
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#ifdef WORDS_BIGENDIAN
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if(sh_audio->format!=0x736F7774){
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#else
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if(sh_audio->format==0x736F7774){ // "twos" is swapped byteorder
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#endif
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int j;
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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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}
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return len;
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}
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