mirror of https://github.com/mpv-player/mpv
104 lines
2.9 KiB
C
104 lines
2.9 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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#include "../libaf/af_format.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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sh_audio->sample_format=AF_FORMAT_S16_LE; // default
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switch(sh_audio->format){ /* hardware formats: */
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case 0x0:
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case 0x1: // Microsoft PCM
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case 0xfffe: // Extended
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switch (sh_audio->samplesize) {
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case 1: sh_audio->sample_format=AF_FORMAT_U8; break;
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case 2: sh_audio->sample_format=AF_FORMAT_S16_LE; break;
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case 3: sh_audio->sample_format=AF_FORMAT_S24_LE; break;
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case 4: sh_audio->sample_format=AF_FORMAT_S32_LE; break;
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}
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break;
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case 0x3: // IEEE float
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sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
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break;
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case 0x6: sh_audio->sample_format=AF_FORMAT_A_LAW;break;
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case 0x7: sh_audio->sample_format=AF_FORMAT_MU_LAW;break;
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case 0x11: sh_audio->sample_format=AF_FORMAT_IMA_ADPCM;break;
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case 0x50: sh_audio->sample_format=AF_FORMAT_MPEG2;break;
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/* case 0x2000: sh_audio->sample_format=AFMT_AC3; */
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case 0x20776172: // 'raw '
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sh_audio->sample_format=AF_FORMAT_S16_BE;
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if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_U8;
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break;
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case 0x736F7774: // 'twos'
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sh_audio->sample_format=AF_FORMAT_S16_BE;
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// intended fall-through
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case 0x74776F73: // 'swot'
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if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_S8;
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// Uncomment this if twos audio is broken for you
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// (typically with movies made on sgi machines)
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// This is just a workaround, the real bug is elsewhere
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#if 0
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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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#endif
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break;
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case 0x32336c66: // 'fl32', bigendian float32
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sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
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sh_audio->samplesize=4;
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break;
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default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AF_FORMAT_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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return len;
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}
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