M4Err Media_GetSampleDescIndex(MediaAtom *mdia, u64 DTS, u32 *sampleDescIndex)
{
M4Err e;
u32 sampleNumber, prevSampleNumber, num;
u64 offset;
u8 isEdited;
if (sampleDescIndex == NULL) return M4BadParam;
//find the sample for this time
e = findEntryForTime(mdia->information->sampleTable, (u32) DTS, 0, &sampleNumber, &prevSampleNumber);
if (e) return e;
if (!sampleNumber && !prevSampleNumber) {
//we have to assume the track was created to be used... If we have a sampleDesc, OK
if (ChainGetCount(mdia->information->sampleTable->SampleDescription->atomList)) {
(*sampleDescIndex) = 1;
return M4OK;
}
return M4BadParam;
}
return stbl_GetSampleInfos(mdia->information->sampleTable, ( sampleNumber ? sampleNumber : prevSampleNumber), &offset, &num, sampleDescIndex, &isEdited);
}
GF_Err Media_GetSampleDescIndex(GF_MediaBox *mdia, u64 DTS, u32 *sampleDescIndex)
{
GF_Err e;
u32 sampleNumber, prevSampleNumber, num;
u64 offset;
u8 isEdited;
if (sampleDescIndex == NULL) return GF_BAD_PARAM;
//find the sample for this time
e = findEntryForTime(mdia->information->sampleTable, (u32) DTS, 0, &sampleNumber, &prevSampleNumber);
if (e) return e;
if (!sampleNumber && !prevSampleNumber) {
//we have to assume the track was created to be used... If we have a sampleDesc, OK
if (gf_list_count(mdia->information->sampleTable->SampleDescription->other_boxes)) {
(*sampleDescIndex) = 1;
return GF_OK;
}
return GF_BAD_PARAM;
}
return stbl_GetSampleInfos(mdia->information->sampleTable, ( sampleNumber ? sampleNumber : prevSampleNumber), &offset, &num, sampleDescIndex, &isEdited);
}
//WARNING: MOVIETIME IS EXPRESSED IN MEDIA TS
GF_Err GetMediaTime(GF_TrackBox *trak, Bool force_non_empty, u64 movieTime, u64 *MediaTime, s64 *SegmentStartTime, s64 *MediaOffset, u8 *useEdit, u64 *next_edit_start_plus_one)
{
#if 0
GF_Err e;
u32 sampleNumber, prevSampleNumber;
u64 firstDTS;
#endif
u32 i, count;
Bool last_is_empty = 0;
u64 time, lastSampleTime;
s64 mtime;
GF_EdtsEntry *ent;
Double scale_ts;
GF_SampleTableBox *stbl = trak->Media->information->sampleTable;
if (next_edit_start_plus_one) *next_edit_start_plus_one = 0;
*useEdit = 1;
*MediaTime = 0;
//no segment yet...
*SegmentStartTime = -1;
*MediaOffset = -1;
if (!trak->moov->mvhd->timeScale || !trak->Media->mediaHeader->timeScale || !stbl->SampleSize) {
return GF_ISOM_INVALID_FILE;
}
//no samples...
if (!stbl->SampleSize->sampleCount) {
lastSampleTime = 0;
} else {
lastSampleTime = trak->Media->mediaHeader->duration;
}
//No edits, 1 to 1 mapping
if (! trak->editBox || !trak->editBox->editList) {
*MediaTime = movieTime;
//check this is in our media time line
if ((*MediaTime > lastSampleTime)
#ifndef GPAC_DISABLE_ISOM_FRAGMENTS
&& !trak->moov->mov->moof
#endif
) {
*MediaTime = lastSampleTime;
}
*useEdit = 0;
return GF_OK;
}
//browse the edit list and get the time
scale_ts = trak->Media->mediaHeader->timeScale;
scale_ts /= trak->moov->mvhd->timeScale;
time = 0;
ent = NULL;
count=gf_list_count(trak->editBox->editList->entryList);
for (i=0; i<count; i++) {
ent = (GF_EdtsEntry *)gf_list_get(trak->editBox->editList->entryList, i);
if ( (time + ent->segmentDuration) * scale_ts > movieTime) {
if (!force_non_empty || (ent->mediaTime >= 0)) {
if (next_edit_start_plus_one) *next_edit_start_plus_one = 1 + (u64) ((time + ent->segmentDuration) * scale_ts);
goto ent_found;
}
}
time += ent->segmentDuration;
last_is_empty = ent->segmentDuration ? 0 : 1;
}
if (last_is_empty) {
ent = (GF_EdtsEntry *)gf_list_last(trak->editBox->editList->entryList);
if (ent->mediaRate==1) {
*MediaTime = movieTime + ent->mediaTime;
} else {
ent = (GF_EdtsEntry *)gf_list_get(trak->editBox->editList->entryList, 0);
if (ent->mediaRate==-1) {
u64 dur = (u64) (ent->segmentDuration * scale_ts);
*MediaTime = (movieTime > dur) ? (movieTime-dur) : 0;
}
}
*useEdit = 0;
return GF_OK;
}
//we had nothing in the list (strange file but compliant...)
//return the 1 to 1 mapped vale of the last media sample
if (!ent) {
*MediaTime = movieTime;
//check this is in our media time line
if (*MediaTime > lastSampleTime) *MediaTime = lastSampleTime;
*useEdit = 0;
return GF_OK;
}
//request for a bigger time that what we can give: return the last sample (undefined behavior...)
*MediaTime = lastSampleTime;
return GF_OK;
ent_found:
//OK, we found our entry, set the SegmentTime
*SegmentStartTime = time;
//we request an empty list, there's no media here...
if (ent->mediaTime < 0) {
*MediaTime = 0;
return GF_OK;
}
//we request a dwell edit
if (! ent->mediaRate) {
*MediaTime = ent->mediaTime;
//no media offset
*MediaOffset = 0;
*useEdit = 2;
return GF_OK;
}
/*WARNING: this can be "-1" when doing searchForward mode (to prevent jumping to next entry)*/
mtime = ent->mediaTime + movieTime - (time * trak->Media->mediaHeader->timeScale / trak->moov->mvhd->timeScale);
if (mtime<0) mtime = 0;
*MediaTime = (u64) mtime;
*MediaOffset = ent->mediaTime;
#if 0
//
//Sanity check: is the requested time valid ? This is to cope with wrong EditLists
//we have the translated time, but we need to make sure we have a sample at this time ...
//we have to find a COMPOSITION time
e = findEntryForTime(stbl, (u32) *MediaTime, 1, &sampleNumber, &prevSampleNumber);
if (e) return e;
//first case: our time is after the last sample DTS (it's a broken editList somehow)
//set the media time to the last sample
if (!sampleNumber && !prevSampleNumber) {
*MediaTime = lastSampleTime;
return GF_OK;
}
//get the appropriated sample
if (!sampleNumber) sampleNumber = prevSampleNumber;
stbl_GetSampleDTS(stbl->TimeToSample, sampleNumber, &DTS);
CTS = 0;
if (stbl->CompositionOffset) stbl_GetSampleCTS(stbl->CompositionOffset, sampleNumber, &CTS);
//now get the entry sample (the entry time gives the CTS, and we need the DTS
e = findEntryForTime(stbl, (u32) ent->mediaTime, 0, &sampleNumber, &prevSampleNumber);
if (e) return e;
//oops, the mediaTime indicates a sample that is not in our media !
if (!sampleNumber && !prevSampleNumber) {
*MediaTime = lastSampleTime;
return GF_ISOM_INVALID_FILE;
}
if (!sampleNumber) sampleNumber = prevSampleNumber;
stbl_GetSampleDTS(stbl->TimeToSample, sampleNumber, &firstDTS);
//and store the "time offset" of the desired sample in this segment
//this is weird, used to rebuild the timeStamp when reading from the track, not the
//media ...
*MediaOffset = firstDTS;
#endif
return GF_OK;
}
