libmpdemux/demux_rawaudio.c

   1
   2 #include "config.h"
   3
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8
   9 #include "m_option.h"
  10
  11 #include "stream/stream.h"
  12 #include "demuxer.h"
  13 #include "stheader.h"
  14
  15
  16 static int channels = 2;
  17 static int samplerate = 44100;
  18 static int samplesize = 2;
  19 static int bitrate = 0;
  20 static int format = 0x1; // Raw PCM
  21
  22 const m_option_t demux_rawaudio_opts[] = {
  23   { "channels", &channels, CONF_TYPE_INT,CONF_RANGE,1,8, NULL },
  24   { "rate", &samplerate, CONF_TYPE_INT,CONF_RANGE,1000,8*48000, NULL },
  25   { "samplesize", &samplesize, CONF_TYPE_INT,CONF_RANGE,1,8, NULL },
  26   { "bitrate", &bitrate, CONF_TYPE_INT,CONF_MIN,0,0, NULL },
  27   { "format", &format, CONF_TYPE_INT, CONF_MIN, 0 , 0, NULL },
  28   {NULL, NULL, 0, 0, 0, 0, NULL}
  29 };
  30
  31
  32 static demuxer_t* demux_rawaudio_open(demuxer_t* demuxer) {
  33   sh_audio_t* sh_audio;
  34   WAVEFORMATEX* w;
  35
  36   sh_audio = new_sh_audio(demuxer,0);
  37   sh_audio->wf = w = malloc(sizeof(WAVEFORMATEX));
  38   w->wFormatTag = sh_audio->format = format;
  39   w->nChannels = sh_audio->channels = channels;
  40   w->nSamplesPerSec = sh_audio->samplerate = samplerate;
  41   if (bitrate > 999)
  42     w->nAvgBytesPerSec = bitrate/8;
  43   else if (bitrate > 0)
  44     w->nAvgBytesPerSec = bitrate*125;
  45   else
  46     w->nAvgBytesPerSec = samplerate*samplesize*channels;
  47   w->nBlockAlign = channels*samplesize;
  48   sh_audio->samplesize = samplesize;
  49   w->wBitsPerSample = 8*samplesize;
  50   w->cbSize = 0;
  51
  52   demuxer->movi_start = demuxer->stream->start_pos;
  53   demuxer->movi_end = demuxer->stream->end_pos;
  54
  55   demuxer->audio->id = 0;
  56   demuxer->audio->sh = sh_audio;
  57   sh_audio->ds = demuxer->audio;
  58
  59   return demuxer;
  60 }
  61
  62 static int demux_rawaudio_fill_buffer(demuxer_t* demuxer, demux_stream_t *ds) {
  63   sh_audio_t* sh_audio = demuxer->audio->sh;
  64   int l = sh_audio->wf->nAvgBytesPerSec;
  65   off_t spos = stream_tell(demuxer->stream);
  66   demux_packet_t*  dp;
  67
  68   if(demuxer->stream->eof)
  69     return 0;
  70
  71   dp = new_demux_packet(l);
  72   dp->pts = (spos - demuxer->movi_start)  / (float)(sh_audio->wf->nAvgBytesPerSec);
  73   dp->pos = (spos - demuxer->movi_start);
  74
  75   l = stream_read(demuxer->stream,dp->buffer,l);
  76   resize_demux_packet(dp, l);
  77   ds_add_packet(ds,dp);
  78
  79   return 1;
  80 }
  81
  82 static void demux_rawaudio_seek(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
  83   stream_t* s = demuxer->stream;
  84   sh_audio_t* sh_audio = demuxer->audio->sh;
  85   off_t base,pos;
  86
  87   base = (flags & SEEK_ABSOLUTE) ? demuxer->movi_start : stream_tell(s);
  88   if(flags & SEEK_FACTOR)
  89     pos = base + ((demuxer->movi_end - demuxer->movi_start)*rel_seek_secs);
  90   else
  91     pos = base + (rel_seek_secs*sh_audio->i_bps);
  92
  93   pos -= (pos % (sh_audio->channels * sh_audio->samplesize) );
  94   stream_seek(s,pos);
  95 //  printf("demux_rawaudio: streamtell=%d\n",(int)stream_tell(demuxer->stream));
  96 }
  97
  98
  99 const demuxer_desc_t demuxer_desc_rawaudio = {
 100   "Raw audio demuxer",
 101   "rawaudio",
 102   "rawaudio",
 103   "?",
 104   "",
 105   DEMUXER_TYPE_RAWAUDIO,
 106   0, // no autodetect
 107   NULL,
 108   demux_rawaudio_fill_buffer,
 109   demux_rawaudio_open,
 110   NULL,
 111   demux_rawaudio_seek,
 112   NULL
 113 };