int quicktime_trak_duration(quicktime_trak_t *trak, long *duration, long *timescale)
{
quicktime_stts_t *stts = &(trak->mdia.minf.stbl.stts);
int i;
*duration = 0;
/* hint track duration is that of reference track */
if (quicktime_trak_is_hint(trak)) {
#ifdef DEBUG
if ((quicktime_trak_t*)trak->tref.hint.traks[0] == trak) {
printf("quicktime_trak_duration: BUG, self reference loop!!!\n");
*duration = 0;
*timescale = 1;
return 0;
}
if ((quicktime_trak_t*)trak->tref.hint.traks[0] == NULL) {
printf("quicktime_trak_duration: BUG, NULL reference!!!\n");
*duration = 0;
*timescale = 1;
return 0;
}
#endif /* DEBUG */
return quicktime_trak_duration(
(quicktime_trak_t*)trak->tref.hint.traks[0], duration, timescale);
}
for(i = 0; i < stts->total_entries; i++) {
*duration += stts->table[i].sample_duration * stts->table[i].sample_count;
}
*timescale = trak->mdia.mdhd.time_scale;
return 0;
}
int quicktime_write_trak(quicktime_t *file, quicktime_trak_t *trak, long moov_time_scale)
{
long duration;
long timescale;
quicktime_atom_t atom;
quicktime_atom_write_header(file, &atom, "trak");
quicktime_trak_duration(trak, &duration, ×cale);
/* printf("quicktime_write_trak duration %d\n", duration); */
/* get duration in movie's units */
if (timescale) {
trak->tkhd.duration =
(long)((float)duration / timescale * moov_time_scale);
} else {
trak->tkhd.duration = 0;
}
trak->mdia.mdhd.duration = duration;
trak->mdia.mdhd.time_scale = timescale;
if (trak->mdia.minf.is_hint) {
if (duration && timescale) {
trak->mdia.minf.hmhd.avgbitrate =
(trak->hint_udta.hinf.trpy.numBytes * 8)
/ (duration / timescale);
} else {
trak->mdia.minf.hmhd.avgbitrate = 0;
}
}
quicktime_write_tkhd(file, &(trak->tkhd));
quicktime_write_edts(file, &(trak->edts), trak->tkhd.duration);
quicktime_write_tref(file, &(trak->tref));
quicktime_write_mdia(file, &(trak->mdia));
quicktime_write_hint_udta(file, &(trak->hint_udta));
quicktime_atom_write_footer(file, &atom);
return 0;
}
int quicktime_write_moov(quicktime_t *file, quicktime_moov_t *moov)
{
quicktime_atom_t atom;
int i;
long longest_duration = 0;
long duration, timescale;
quicktime_atom_write_header(file, &atom, "moov");
/* get the duration from the longest track in the mvhd's timescale */
for(i = 0; i < moov->total_tracks; i++)
{
quicktime_trak_fix_counts(file, moov->trak[i]);
quicktime_trak_duration(moov->trak[i], &duration, ×cale);
duration = (long)((float)duration / timescale * moov->mvhd.time_scale);
if(duration > longest_duration)
{
longest_duration = duration;
}
}
moov->mvhd.duration = longest_duration;
moov->mvhd.selection_duration = longest_duration;
quicktime_write_mvhd(file, &(moov->mvhd));
quicktime_write_iods(file, &(moov->iods));
quicktime_write_udta(file, &(moov->udta));
for(i = 0; i < moov->total_tracks; i++)
{
quicktime_write_trak(file, moov->trak[i], moov->mvhd.time_scale);
}
/*quicktime_write_ctab(file, &(moov->ctab)); */
quicktime_atom_write_footer(file, &atom);
}
