libmpeg3/mpeg3atrack.c

   1 #include "libmpeg3.h"
   2 #include "mpeg3protos.h"
   3
   4 #include <stdlib.h>
   5
   6 mpeg3_atrack_t* mpeg3_new_atrack(mpeg3_t *file,
   7         int custom_id,
   8         int format,
   9         mpeg3_demuxer_t *demuxer,
  10         int number)
  11 {
  12         mpeg3_atrack_t *new_atrack;
  13
  14         new_atrack = calloc(1, sizeof(mpeg3_atrack_t));
  15         if(file->channel_counts)
  16                 new_atrack->channels = file->channel_counts[number];
  17         new_atrack->sample_rate = 0;
  18         new_atrack->total_samples = 0;
  19         new_atrack->demuxer = mpeg3_new_demuxer(file, 1, 0, custom_id);
  20         if(file->seekable)
  21         {
  22                 mpeg3demux_copy_titles(new_atrack->demuxer, demuxer);
  23         }
  24         new_atrack->current_position = 0;
  25         new_atrack->pid = custom_id;
  26
  27
  28 /* Copy pointers */
  29         if(file->sample_offsets)
  30         {
  31                 new_atrack->sample_offsets = file->sample_offsets[number];
  32                 new_atrack->total_sample_offsets = file->total_sample_offsets[number];
  33                 new_atrack->total_samples = file->total_samples[number];
  34                 new_atrack->demuxer->stream_end = file->audio_eof[number];
  35         }
  36
  37         new_atrack->audio = mpeg3audio_new(file,
  38                 new_atrack,
  39                 format);
  40
  41         if(!new_atrack->audio)
  42         {
  43 /* Failed */
  44                 mpeg3_delete_atrack(file, new_atrack);
  45                 new_atrack = 0;
  46         }
  47
  48         return new_atrack;
  49 }
  50
  51 int mpeg3_delete_atrack(mpeg3_t *file, mpeg3_atrack_t *atrack)
  52 {
  53         if(atrack->audio) mpeg3audio_delete(atrack->audio);
  54         if(atrack->demuxer) mpeg3_delete_demuxer(atrack->demuxer);
  55         if(atrack->sample_offsets && atrack->private_offsets)
  56         {
  57                 free(atrack->sample_offsets);
  58         }
  59         free(atrack);
  60         return 0;
  61 }
  62
  63 void mpeg3_append_samples(mpeg3_atrack_t *atrack, int64_t offset)
  64 {
  65         if(atrack->total_sample_offsets >= atrack->sample_offsets_allocated)
  66         {
  67                 atrack->sample_offsets_allocated =
  68                         MAX(atrack->total_sample_offsets * 2, 1024);
  69                 atrack->sample_offsets = realloc(atrack->sample_offsets,
  70                         sizeof(int64_t) * atrack->sample_offsets_allocated);
  71         }
  72         atrack->sample_offsets[atrack->total_sample_offsets++] =
  73                 offset;
  74         atrack->private_offsets = 1;
  75 }
  76
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