long quicktime_video_length(quicktime_t *file, int track)
{
/*printf("quicktime_video_length %d %d\n", quicktime_track_samples(file, file->vtracks[track].track), track); */
if(file->total_vtracks > 0)
return quicktime_track_samples(file, file->vtracks[track].track);
return 0;
}
long quicktime_audio_length(quicktime_t *file, int track)
{
if(file->total_atracks > 0)
return quicktime_track_samples(file, file->atracks[track].track);
return 0;
}
int quicktime_trak_fix_counts(quicktime_t *file, quicktime_trak_t *trak)
{
long samples = quicktime_track_samples(file, trak);
if (trak->mdia.minf.stbl.stts.total_entries == 1) {
trak->mdia.minf.stbl.stts.table[0].sample_count = samples;
}
if(trak->mdia.minf.stbl.stsz.sample_size)
trak->mdia.minf.stbl.stsz.total_entries = samples;
return 0;
}
long quicktime_frame_size(quicktime_t *file, long frame, int track)
{
long bytes = 0;
quicktime_trak_t *trak = file->vtracks[track].track;
if(trak->mdia.minf.stbl.stsz.sample_size)
{
bytes = trak->mdia.minf.stbl.stsz.sample_size;
}
else
{
long total_frames = quicktime_track_samples(file, trak);
if(frame < 0) frame = 0;
else
if(frame > total_frames - 1) frame = total_frames - 1;
bytes = trak->mdia.minf.stbl.stsz.table[frame].size;
}
return bytes;
}
void quicktime_finalize_hdrl(quicktime_t *file, quicktime_hdrl_t *hdrl)
{
int i;
int64_t position = quicktime_position(file);
int64_t total_frames = 0;
double frame_rate = 0;
for(i = 0; i < file->moov.total_tracks; i++)
{
quicktime_trak_t *trak = file->moov.trak[i];
quicktime_strl_t *strl = hdrl->strl[i];
if(trak->mdia.minf.is_video)
{
int length;
quicktime_set_position(file, strl->length_offset);
total_frames = length = quicktime_track_samples(file, trak);
quicktime_write_int32_le(file, length);
frame_rate = (double)trak->mdia.mdhd.time_scale /
trak->mdia.minf.stbl.stts.table[0].sample_duration;
}
else
if(trak->mdia.minf.is_audio)
{
int length, samples_per_chunk, wav_id, sample_size, sample_rate;
quicktime_set_position(file, strl->length_offset);
length = quicktime_track_samples(file, trak);
quicktime_write_int32_le(file, length);
// dwScale and dwRate as per MSDN - // http://msdn.microsoft.com/library/default.asp?
// url=/library/en-us/wcemultimedia5/html/wce50conAVIStreamHeaders.asp
quicktime_set_position(file, strl->samples_per_chunk_offset);
wav_id = ((quicktime_codec_t*)(file->atracks[0].codec))->wav_id;
samples_per_chunk = wav_id == 1 ? 1 :
quicktime_avg_chunk_samples(file, trak);
quicktime_write_int32_le(file, samples_per_chunk);
sample_rate = trak->mdia.minf.stbl.stsd.table[0].sample_rate;
quicktime_write_int32_le(file, sample_rate);
quicktime_set_position(file, strl->sample_size_offset);
// dwSampleSize as per MSDN
// as per http://www.virtualdub.org/blog/pivot/entry.php?id=27, many programs ignore this value
// sample_size in quicktime is in bits... so we must divide by 8
// FIXME: This has to be zero for _all_ VBR encodings, and other values are used for specific encodings
sample_size = trak->mdia.minf.stbl.stsd.table[0].sample_size;
quicktime_write_int32_le(file, wav_id != 1 ? sample_size :
trak->mdia.minf.stbl.stsd.table[0].channels * sample_size / 8);
}
}
if(total_frames)
{
quicktime_set_position(file, hdrl->bitrate_offset);
quicktime_write_int32_le(file,
file->total_length / (total_frames / frame_rate));
quicktime_set_position(file, hdrl->frames_offset);
quicktime_write_int32_le(file, total_frames);
}
quicktime_set_position(file, position);
}
