libmpdemux/demux_rawaudio.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25
  26 #include "m_option.h"
  27
  28 #include "stream/stream.h"
  29 #include "demuxer.h"
  30 #include "stheader.h"
  31
  32
  33 static int channels = 2;
  34 static int samplerate = 44100;
  35 static int samplesize = 2;
  36 static int bitrate = 0;
  37 static int format = 0x1; // Raw PCM
  38
  39 const m_option_t demux_rawaudio_opts[] = {
  40   { "channels", &channels, CONF_TYPE_INT,CONF_RANGE,1,8, NULL },
  41   { "rate", &samplerate, CONF_TYPE_INT,CONF_RANGE,1000,8*48000, NULL },
  42   { "samplesize", &samplesize, CONF_TYPE_INT,CONF_RANGE,1,8, NULL },
  43   { "bitrate", &bitrate, CONF_TYPE_INT,CONF_MIN,0,0, NULL },
  44   { "format", &format, CONF_TYPE_INT, CONF_MIN, 0 , 0, NULL },
  45   {NULL, NULL, 0, 0, 0, 0, NULL}
  46 };
  47
  48
  49 static demuxer_t* demux_rawaudio_open(demuxer_t* demuxer) {
  50   sh_audio_t* sh_audio;
  51   WAVEFORMATEX* w;
  52
  53   sh_audio = new_sh_audio(demuxer,0);
  54   sh_audio->wf = w = malloc(sizeof(*w));
  55   w->wFormatTag = sh_audio->format = format;
  56   w->nChannels = sh_audio->channels = channels;
  57   w->nSamplesPerSec = sh_audio->samplerate = samplerate;
  58   if (bitrate > 999)
  59     w->nAvgBytesPerSec = bitrate/8;
  60   else if (bitrate > 0)
  61     w->nAvgBytesPerSec = bitrate*125;
  62   else
  63     w->nAvgBytesPerSec = samplerate*samplesize*channels;
  64   w->nBlockAlign = channels*samplesize;
  65   sh_audio->samplesize = samplesize;
  66   w->wBitsPerSample = 8*samplesize;
  67   w->cbSize = 0;
  68
  69   demuxer->movi_start = demuxer->stream->start_pos;
  70   demuxer->movi_end = demuxer->stream->end_pos;
  71
  72   demuxer->audio->id = 0;
  73   demuxer->audio->sh = sh_audio;
  74   sh_audio->ds = demuxer->audio;
  75   sh_audio->needs_parsing = 1;
  76
  77   return demuxer;
  78 }
  79
  80 static int demux_rawaudio_fill_buffer(demuxer_t* demuxer, demux_stream_t *ds) {
  81   sh_audio_t* sh_audio = demuxer->audio->sh;
  82   int l = sh_audio->wf->nAvgBytesPerSec;
  83   off_t spos = stream_tell(demuxer->stream);
  84   demux_packet_t*  dp;
  85
  86   if(demuxer->stream->eof)
  87     return 0;
  88
  89   dp = new_demux_packet(l);
  90   dp->pts = (spos - demuxer->movi_start)  / (float)(sh_audio->wf->nAvgBytesPerSec);
  91   dp->pos = (spos - demuxer->movi_start);
  92
  93   l = stream_read(demuxer->stream,dp->buffer,l);
  94   resize_demux_packet(dp, l);
  95   ds_add_packet(ds,dp);
  96
  97   return 1;
  98 }
  99
 100 static void demux_rawaudio_seek(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
 101   stream_t* s = demuxer->stream;
 102   sh_audio_t* sh_audio = demuxer->audio->sh;
 103   off_t base,pos;
 104
 105   base = (flags & SEEK_ABSOLUTE) ? demuxer->movi_start : stream_tell(s);
 106   if(flags & SEEK_FACTOR)
 107     pos = base + ((demuxer->movi_end - demuxer->movi_start)*rel_seek_secs);
 108   else
 109     pos = base + (rel_seek_secs*sh_audio->i_bps);
 110
 111   pos -= (pos % (sh_audio->channels * sh_audio->samplesize) );
 112   stream_seek(s,pos);
 113 //  printf("demux_rawaudio: streamtell=%d\n",(int)stream_tell(demuxer->stream));
 114 }
 115
 116 const demuxer_desc_t demuxer_desc_rawaudio = {
 117   "Raw audio demuxer",
 118   "rawaudio",
 119   "rawaudio",
 120   "?",
 121   "",
 122   DEMUXER_TYPE_RAWAUDIO,
 123   0, // no autodetect
 124   NULL,
 125   demux_rawaudio_fill_buffer,
 126   demux_rawaudio_open,
 127   NULL,
 128   demux_rawaudio_seek,
 129 };