/*----------------------------------------------------------------------
| Fragment
+---------------------------------------------------------------------*/
static void
Fragment(AP4_File& input_file,
AP4_ByteStream& output_stream,
AP4_Array<TrackCursor*>& cursors,
unsigned int fragment_duration,
AP4_UI32 timescale,
AP4_UI32 track_id,
bool create_segment_index)
{
AP4_List<FragmentInfo> fragments;
TrackCursor* index_cursor = NULL;
AP4_Result result;
AP4_Movie* input_movie = input_file.GetMovie();
if (input_movie == NULL) {
fprintf(stderr, "ERROR: no moov found in the input file\n");
return;
}
// create the output file object
AP4_Movie* output_movie = new AP4_Movie(1000);
// create an mvex container
AP4_ContainerAtom* mvex = new AP4_ContainerAtom(AP4_ATOM_TYPE_MVEX);
AP4_MehdAtom* mehd = new AP4_MehdAtom(0);
mvex->AddChild(mehd);
// add an output track for each track in the input file
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
AP4_Track* track = cursors[i]->m_Track;
// skip non matching tracks if we have a selector
if (track_id && track->GetId() != track_id) {
continue;
}
result = cursors[i]->Init();
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to init sample cursor (%d), skipping track %d\n", result, track->GetId());
return;
}
// create a sample table (with no samples) to hold the sample description
AP4_SyntheticSampleTable* sample_table = new AP4_SyntheticSampleTable();
for (unsigned int j=0; j<track->GetSampleDescriptionCount(); j++) {
AP4_SampleDescription* sample_description = track->GetSampleDescription(j);
sample_table->AddSampleDescription(sample_description, false);
}
// create the track
AP4_Track* output_track = new AP4_Track(sample_table,
track->GetId(),
timescale?timescale:1000,
AP4_ConvertTime(track->GetDuration(),
input_movie->GetTimeScale(),
timescale?timescale:1000),
timescale?timescale:track->GetMediaTimeScale(),
0,//track->GetMediaDuration(),
track);
output_movie->AddTrack(output_track);
// add a trex entry to the mvex container
AP4_TrexAtom* trex = new AP4_TrexAtom(track->GetId(),
1,
0,
0,
0);
mvex->AddChild(trex);
}
// select the anchor cursor
TrackCursor* anchor_cursor = NULL;
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (cursors[i]->m_Track->GetId() == track_id) {
anchor_cursor = cursors[i];
}
}
if (anchor_cursor == NULL) {
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
// use this as the anchor track if it is the first video track
if (cursors[i]->m_Track->GetType() == AP4_Track::TYPE_VIDEO) {
anchor_cursor = cursors[i];
break;
}
}
}
if (anchor_cursor == NULL) {
// no video track to anchor with, pick the first audio track
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (cursors[i]->m_Track->GetType() == AP4_Track::TYPE_AUDIO) {
anchor_cursor = cursors[i];
break;
}
}
// no audio track to anchor with, pick the first subtitles track
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (cursors[i]->m_Track->GetType() == AP4_Track::TYPE_SUBTITLES) {
anchor_cursor = cursors[i];
break;
}
}
}
if (anchor_cursor == NULL) {
// this shoudl never happen
fprintf(stderr, "ERROR: no anchor track\n");
return;
}
if (create_segment_index) {
index_cursor = anchor_cursor;
}
if (Options.debug) {
printf("Using track ID %d as anchor\n", anchor_cursor->m_Track->GetId());
}
// update the mehd duration
mehd->SetDuration(output_movie->GetDuration());
// add the mvex container to the moov container
output_movie->GetMoovAtom()->AddChild(mvex);
// compute all the fragments
unsigned int sequence_number = 1;
for(;;) {
TrackCursor* cursor = NULL;
// pick the first track with a fragment index lower than the anchor's
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (track_id && cursors[i]->m_Track->GetId() != track_id) continue;
if (cursors[i]->m_Eos) continue;
if (cursors[i]->m_FragmentIndex < anchor_cursor->m_FragmentIndex) {
cursor = cursors[i];
break;
}
}
// check if we found a non-anchor cursor to use
if (cursor == NULL) {
// the anchor should be used in this round, check if we can use it
if (anchor_cursor->m_Eos) {
// the anchor is done, pick a new anchor unless we need to trim
anchor_cursor = NULL;
if (!Options.trim) {
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (track_id && cursors[i]->m_Track->GetId() != track_id) continue;
if (cursors[i]->m_Eos) continue;
if (anchor_cursor == NULL ||
cursors[i]->m_Track->GetType() == AP4_Track::TYPE_VIDEO ||
cursors[i]->m_Track->GetType() == AP4_Track::TYPE_AUDIO) {
anchor_cursor = cursors[i];
if (Options.debug) {
printf("+++ New anchor: Track ID %d\n", anchor_cursor->m_Track->GetId());
}
}
}
}
}
cursor = anchor_cursor;
}
if (cursor == NULL) break; // all done
// decide how many samples go into this fragment
AP4_UI64 target_dts;
if (cursor == anchor_cursor) {
// compute the current dts in milliseconds
AP4_UI64 anchor_dts_ms = AP4_ConvertTime(cursor->m_Sample.GetDts(),
cursor->m_Track->GetMediaTimeScale(),
1000);
// round to the nearest multiple of fragment_duration
AP4_UI64 anchor_position = (anchor_dts_ms + (fragment_duration/2))/fragment_duration;
// pick the next fragment_duration multiple at our target
target_dts = AP4_ConvertTime(fragment_duration*(anchor_position+1),
1000,
cursor->m_Track->GetMediaTimeScale());
} else {
target_dts = AP4_ConvertTime(anchor_cursor->m_Sample.GetDts(),
anchor_cursor->m_Track->GetMediaTimeScale(),
cursor->m_Track->GetMediaTimeScale());
if (target_dts <= cursor->m_Sample.GetDts()) {
// we must be at the end, past the last anchor sample, just use the target duration
target_dts = AP4_ConvertTime(fragment_duration*(cursor->m_FragmentIndex+1),
1000,
cursor->m_Track->GetMediaTimeScale());
if (target_dts <= cursor->m_Sample.GetDts()) {
// we're still behind, there may have been an alignment/rounding error, just advance by one segment duration
target_dts = cursor->m_Sample.GetDts()+AP4_ConvertTime(fragment_duration,
1000,
cursor->m_Track->GetMediaTimeScale());
}
}
}
unsigned int end_sample_index = cursor->m_Samples->GetSampleCount();
AP4_UI64 smallest_diff = (AP4_UI64)(0xFFFFFFFFFFFFFFFFULL);
AP4_Sample sample;
for (unsigned int i=cursor->m_SampleIndex+1; i<=cursor->m_Samples->GetSampleCount(); i++) {
AP4_UI64 dts;
if (i < cursor->m_Samples->GetSampleCount()) {
result = cursor->m_Samples->GetSample(i, sample);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to get sample %d (%d)\n", i, result);
return;
}
if (!sample.IsSync()) continue; // only look for sync samples
dts = sample.GetDts();
} else {
result = cursor->m_Samples->GetSample(i-1, sample);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to get sample %d (%d)\n", i-1, result);
return;
}
dts = sample.GetDts()+sample.GetDuration();
}
AP4_SI64 diff = dts-target_dts;
AP4_UI64 abs_diff = diff<0?-diff:diff;
if (abs_diff < smallest_diff) {
// this sample is the closest to the target so far
end_sample_index = i;
smallest_diff = abs_diff;
}
if (diff >= 0) {
// this sample is past the target, it is not going to get any better, stop looking
break;
}
}
if (cursor->m_Eos) continue;
if (Options.debug) {
if (cursor == anchor_cursor) {
printf("====");
} else {
printf("----");
}
printf(" Track ID %d - dts=%lld, target=%lld, start=%d, end=%d/%d\n",
cursor->m_Track->GetId(),
cursor->m_Sample.GetDts(),
target_dts,
cursor->m_SampleIndex,
end_sample_index,
cursor->m_Track->GetSampleCount());
}
// emit a fragment for the selected track
if (Options.verbosity > 1) {
printf("fragment: track ID %d ", cursor->m_Track->GetId());
}
// decide which sample description index to use
// (this is not very sophisticated, we only look at the sample description
// index of the first sample in the group, which may not be correct. This
// should be fixed later)
unsigned int sample_desc_index = cursor->m_Sample.GetDescriptionIndex();
unsigned int tfhd_flags = AP4_TFHD_FLAG_DEFAULT_BASE_IS_MOOF;
if (sample_desc_index > 0) {
tfhd_flags |= AP4_TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX_PRESENT;
}
if (cursor->m_Track->GetType() == AP4_Track::TYPE_VIDEO) {
tfhd_flags |= AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT;
}
// setup the moof structure
AP4_ContainerAtom* moof = new AP4_ContainerAtom(AP4_ATOM_TYPE_MOOF);
AP4_MfhdAtom* mfhd = new AP4_MfhdAtom(sequence_number++);
moof->AddChild(mfhd);
AP4_ContainerAtom* traf = new AP4_ContainerAtom(AP4_ATOM_TYPE_TRAF);
AP4_TfhdAtom* tfhd = new AP4_TfhdAtom(tfhd_flags,
cursor->m_Track->GetId(),
0,
sample_desc_index+1,
0,
0,
0);
if (tfhd_flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT) {
tfhd->SetDefaultSampleFlags(0x1010000); // sample_is_non_sync_sample=1, sample_depends_on=1 (not I frame)
}
traf->AddChild(tfhd);
if (!Options.no_tfdt) {
AP4_TfdtAtom* tfdt = new AP4_TfdtAtom(1, cursor->m_Timestamp);
traf->AddChild(tfdt);
}
AP4_UI32 trun_flags = AP4_TRUN_FLAG_DATA_OFFSET_PRESENT |
AP4_TRUN_FLAG_SAMPLE_DURATION_PRESENT |
AP4_TRUN_FLAG_SAMPLE_SIZE_PRESENT;
AP4_UI32 first_sample_flags = 0;
if (cursor->m_Track->GetType() == AP4_Track::TYPE_VIDEO) {
trun_flags |= AP4_TRUN_FLAG_FIRST_SAMPLE_FLAGS_PRESENT;
first_sample_flags = 0x2000000; // sample_depends_on=2 (I frame)
}
AP4_TrunAtom* trun = new AP4_TrunAtom(trun_flags, 0, first_sample_flags);
traf->AddChild(trun);
moof->AddChild(traf);
// create a new FragmentInfo object to store the fragment details
FragmentInfo* fragment = new FragmentInfo(cursor->m_Samples, cursor->m_Tfra, cursor->m_Timestamp, moof);
fragments.Add(fragment);
// add samples to the fragment
unsigned int sample_count = 0;
AP4_Array<AP4_TrunAtom::Entry> trun_entries;
fragment->m_MdatSize = AP4_ATOM_HEADER_SIZE;
for (;;) {
// if we have one non-zero CTS delta, we'll need to express it
if (cursor->m_Sample.GetCtsDelta()) {
trun->SetFlags(trun->GetFlags() | AP4_TRUN_FLAG_SAMPLE_COMPOSITION_TIME_OFFSET_PRESENT);
}
// add one sample
trun_entries.SetItemCount(sample_count+1);
AP4_TrunAtom::Entry& trun_entry = trun_entries[sample_count];
trun_entry.sample_duration = timescale?
(AP4_UI32)AP4_ConvertTime(cursor->m_Sample.GetDuration(),
cursor->m_Track->GetMediaTimeScale(),
timescale):
cursor->m_Sample.GetDuration();
trun_entry.sample_size = cursor->m_Sample.GetSize();
trun_entry.sample_composition_time_offset = timescale?
(AP4_UI32)AP4_ConvertTime(cursor->m_Sample.GetCtsDelta(),
cursor->m_Track->GetMediaTimeScale(),
timescale):
cursor->m_Sample.GetCtsDelta();
fragment->m_SampleIndexes.SetItemCount(sample_count+1);
fragment->m_SampleIndexes[sample_count] = cursor->m_SampleIndex;
fragment->m_MdatSize += trun_entry.sample_size;
fragment->m_Duration += trun_entry.sample_duration;
// next sample
cursor->m_Timestamp += trun_entry.sample_duration;
result = cursor->SetSampleIndex(cursor->m_SampleIndex+1);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to get sample %d (%d)\n", cursor->m_SampleIndex+1, result);
return;
}
sample_count++;
if (cursor->m_Eos) {
if (Options.debug) {
printf("[Track ID %d has reached the end]\n", cursor->m_Track->GetId());
}
break;
}
if (cursor->m_SampleIndex >= end_sample_index) {
break; // done with this fragment
}
}
if (Options.verbosity > 1) {
printf(" %d samples\n", sample_count);
}
// update moof and children
trun->SetEntries(trun_entries);
trun->SetDataOffset((AP4_UI32)moof->GetSize()+AP4_ATOM_HEADER_SIZE);
// advance the cursor's fragment index
++cursor->m_FragmentIndex;
}
// write the ftyp atom
AP4_FtypAtom* ftyp = input_file.GetFileType();
if (ftyp) {
// keep the existing brand and compatible brands
AP4_Array<AP4_UI32> compatible_brands;
compatible_brands.EnsureCapacity(ftyp->GetCompatibleBrands().ItemCount()+1);
for (unsigned int i=0; i<ftyp->GetCompatibleBrands().ItemCount(); i++) {
compatible_brands.Append(ftyp->GetCompatibleBrands()[i]);
}
// add the compatible brand if it is not already there
if (!ftyp->HasCompatibleBrand(AP4_FILE_BRAND_ISO5)) {
compatible_brands.Append(AP4_FILE_BRAND_ISO5);
}
// create a replacement
AP4_FtypAtom* new_ftyp = new AP4_FtypAtom(ftyp->GetMajorBrand(),
ftyp->GetMinorVersion(),
&compatible_brands[0],
compatible_brands.ItemCount());
ftyp = new_ftyp;
} else {
AP4_UI32 compat = AP4_FILE_BRAND_ISO5;
ftyp = new AP4_FtypAtom(AP4_FTYP_BRAND_MP42, 0, &compat, 1);
}
ftyp->Write(output_stream);
delete ftyp;
// write the moov atom
output_movie->GetMoovAtom()->Write(output_stream);
// write the (not-yet fully computed) index if needed
AP4_SidxAtom* sidx = NULL;
AP4_Position sidx_position = 0;
output_stream.Tell(sidx_position);
if (create_segment_index) {
sidx = new AP4_SidxAtom(index_cursor->m_Track->GetId(),
index_cursor->m_Track->GetMediaTimeScale(),
0,
0);
// reserve space for the entries now, but they will be computed and updated later
sidx->SetReferenceCount(fragments.ItemCount());
sidx->Write(output_stream);
}
// write all fragments
for (AP4_List<FragmentInfo>::Item* item = fragments.FirstItem();
item;
item = item->GetNext()) {
FragmentInfo* fragment = item->GetData();
// remember the time and position of this fragment
output_stream.Tell(fragment->m_MoofPosition);
fragment->m_Tfra->AddEntry(fragment->m_Timestamp, fragment->m_MoofPosition);
// write the moof
fragment->m_Moof->Write(output_stream);
// write mdat
output_stream.WriteUI32(fragment->m_MdatSize);
output_stream.WriteUI32(AP4_ATOM_TYPE_MDAT);
AP4_DataBuffer sample_data;
AP4_Sample sample;
for (unsigned int i=0; i<fragment->m_SampleIndexes.ItemCount(); i++) {
// get the sample
result = fragment->m_Samples->GetSample(fragment->m_SampleIndexes[i], sample);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to get sample %d (%d)\n", fragment->m_SampleIndexes[i], result);
return;
}
// read the sample data
result = sample.ReadData(sample_data);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to read sample data for sample %d (%d)\n", fragment->m_SampleIndexes[i], result);
return;
}
// write the sample data
result = output_stream.Write(sample_data.GetData(), sample_data.GetDataSize());
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to write sample data (%d)\n", result);
return;
}
}
}
// update the index and re-write it if needed
if (create_segment_index) {
unsigned int segment_index = 0;
AP4_SidxAtom::Reference reference;
for (AP4_List<FragmentInfo>::Item* item = fragments.FirstItem();
item;
item = item->GetNext()) {
FragmentInfo* fragment = item->GetData();
reference.m_ReferencedSize = (AP4_UI32)(fragment->m_Moof->GetSize()+fragment->m_MdatSize);
reference.m_SubsegmentDuration = fragment->m_Duration;
reference.m_StartsWithSap = true;
sidx->SetReference(segment_index++, reference);
}
AP4_Position here = 0;
output_stream.Tell(here);
output_stream.Seek(sidx_position);
sidx->Write(output_stream);
output_stream.Seek(here);
delete sidx;
}
// create an mfra container and write out the index
AP4_ContainerAtom mfra(AP4_ATOM_TYPE_MFRA);
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (track_id && cursors[i]->m_Track->GetId() != track_id) {
continue;
}
mfra.AddChild(cursors[i]->m_Tfra);
cursors[i]->m_Tfra = NULL;
}
AP4_MfroAtom* mfro = new AP4_MfroAtom((AP4_UI32)mfra.GetSize()+16);
mfra.AddChild(mfro);
result = mfra.Write(output_stream);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to write 'mfra' (%d)\n", result);
return;
}
// cleanup
fragments.DeleteReferences();
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
delete cursors[i];
}
for (AP4_List<FragmentInfo>::Item* item = fragments.FirstItem();
item;
item = item->GetNext()) {
FragmentInfo* fragment = item->GetData();
delete fragment->m_Moof;
}
delete output_movie;
}
/*----------------------------------------------------------------------
| AP4_Processor::Process
+---------------------------------------------------------------------*/
AP4_Result
AP4_Processor::Process(AP4_ByteStream& input,
AP4_ByteStream& output,
AP4_ByteStream* fragments,
ProgressListener* listener,
AP4_AtomFactory& atom_factory)
{
// read all atoms.
// keep all atoms except [mdat]
// keep a ref to [moov]
// put [moof] atoms in a separate list
AP4_AtomParent top_level;
AP4_MoovAtom* moov = NULL;
AP4_ContainerAtom* mfra = NULL;
AP4_SidxAtom* sidx = NULL;
AP4_List<AP4_AtomLocator> frags;
AP4_UI64 stream_offset = 0;
bool in_fragments = false;
unsigned int sidx_count = 0;
for (AP4_Atom* atom = NULL;
AP4_SUCCEEDED(atom_factory.CreateAtomFromStream(input, atom));
input.Tell(stream_offset)) {
if (atom->GetType() == AP4_ATOM_TYPE_MDAT) {
delete atom;
continue;
} else if (atom->GetType() == AP4_ATOM_TYPE_MOOV) {
moov = AP4_DYNAMIC_CAST(AP4_MoovAtom, atom);
if (fragments) break;
} else if (atom->GetType() == AP4_ATOM_TYPE_MFRA) {
mfra = AP4_DYNAMIC_CAST(AP4_ContainerAtom, atom);
continue;
} else if (atom->GetType() == AP4_ATOM_TYPE_SIDX) {
// don't keep the index, it is likely to be invalidated, we will recompute it later
++sidx_count;
if (sidx == NULL) {
sidx = AP4_DYNAMIC_CAST(AP4_SidxAtom, atom);
} else {
delete atom;
continue;
}
} else if (atom->GetType() == AP4_ATOM_TYPE_SSIX) {
// don't keep the index, it is likely to be invalidated
delete atom;
continue;
} else if (!fragments && (in_fragments || atom->GetType() == AP4_ATOM_TYPE_MOOF)) {
in_fragments = true;
frags.Add(new AP4_AtomLocator(atom, stream_offset));
break;
}
top_level.AddChild(atom);
}
// check that we have at most one sidx (we can't deal with multi-sidx streams here
if (sidx_count > 1) {
top_level.RemoveChild(sidx);
delete sidx;
sidx = NULL;
}
// if we have a fragments stream, get the fragment locators from there
if (fragments) {
stream_offset = 0;
for (AP4_Atom* atom = NULL;
AP4_SUCCEEDED(atom_factory.CreateAtomFromStream(*fragments, atom));
fragments->Tell(stream_offset)) {
if (atom->GetType() == AP4_ATOM_TYPE_MDAT) {
delete atom;
continue;
}
frags.Add(new AP4_AtomLocator(atom, stream_offset));
}
}
// initialize the processor
AP4_Result result = Initialize(top_level, input);
if (AP4_FAILED(result)) return result;
// process the tracks if we have a moov atom
AP4_Array<AP4_SampleLocator> locators;
AP4_Cardinal track_count = 0;
AP4_List<AP4_TrakAtom>* trak_atoms = NULL;
AP4_LargeSize mdat_payload_size = 0;
AP4_SampleCursor* cursors = NULL;
if (moov) {
// build an array of track sample locators
trak_atoms = &moov->GetTrakAtoms();
track_count = trak_atoms->ItemCount();
cursors = new AP4_SampleCursor[track_count];
m_TrackData.SetItemCount(track_count);
m_StreamData.SetItemCount(1);
m_StreamData[0].stream = &input;
unsigned int index = 0;
for (AP4_List<AP4_TrakAtom>::Item* item = trak_atoms->FirstItem(); item; item=item->GetNext()) {
AP4_TrakAtom* trak = item->GetData();
// find the stsd atom
AP4_ContainerAtom* stbl = AP4_DYNAMIC_CAST(AP4_ContainerAtom, trak->FindChild("mdia/minf/stbl"));
if (stbl == NULL) continue;
// see if there's an external data source for this track
AP4_ByteStream* trak_data_stream = &input;
for (AP4_List<ExternalTrackData>::Item* ditem = m_ExternalTrackData.FirstItem(); ditem; ditem=ditem->GetNext()) {
ExternalTrackData* tdata = ditem->GetData();
if (tdata->m_TrackId == trak->GetId()) {
trak_data_stream = tdata->m_MediaData;
break;
}
}
AP4_ContainerAtom *mvex = AP4_DYNAMIC_CAST(AP4_ContainerAtom, moov->GetChild(AP4_ATOM_TYPE_MVEX));
AP4_TrexAtom* trex = NULL;
if (mvex) {
for (AP4_List<AP4_Atom>::Item* item = mvex->GetChildren().FirstItem(); item; item = item->GetNext()) {
AP4_Atom* atom = item->GetData();
if (atom->GetType() == AP4_ATOM_TYPE_TREX) {
trex = AP4_DYNAMIC_CAST(AP4_TrexAtom, atom);
if (trex && trex->GetTrackId() == trak->GetId())
break;
trex = NULL;
}
}
}
// create the track handler
m_TrackData[index].track_handler = CreateTrackHandler(trak, trex);
m_TrackData[index].new_id = trak->GetId();
cursors[index].m_Locator.m_TrakIndex = index;
cursors[index].m_Locator.m_SampleTable = new AP4_AtomSampleTable(stbl, *trak_data_stream);
cursors[index].m_Locator.m_SampleIndex = 0;
cursors[index].m_Locator.m_ChunkIndex = 0;
if (cursors[index].m_Locator.m_SampleTable->GetSampleCount()) {
cursors[index].m_Locator.m_SampleTable->GetSample(0, cursors[index].m_Locator.m_Sample);
} else {
cursors[index].m_EndReached = true;
}
index++;
}
// figure out the layout of the chunks
for (;;) {
// see which is the next sample to write
AP4_UI64 min_offset = (AP4_UI64)(-1);
int cursor = -1;
for (unsigned int i=0; i<track_count; i++) {
if (!cursors[i].m_EndReached &&
cursors[i].m_Locator.m_Sample.GetOffset() <= min_offset) {
min_offset = cursors[i].m_Locator.m_Sample.GetOffset();
cursor = i;
}
}
// stop if all cursors are exhausted
if (cursor == -1) break;
// append this locator to the layout list
AP4_SampleLocator& locator = cursors[cursor].m_Locator;
locators.Append(locator);
// move the cursor to the next sample
locator.m_SampleIndex++;
if (locator.m_SampleIndex == locator.m_SampleTable->GetSampleCount()) {
// mark this track as completed
cursors[cursor].m_EndReached = true;
} else {
// get the next sample info
locator.m_SampleTable->GetSample(locator.m_SampleIndex, locator.m_Sample);
AP4_Ordinal skip, sdesc;
locator.m_SampleTable->GetChunkForSample(locator.m_SampleIndex,
locator.m_ChunkIndex,
skip, sdesc);
}
}
// update the stbl atoms and compute the mdat size
int current_track = -1;
int current_chunk = -1;
AP4_Position current_chunk_offset = 0;
AP4_Size current_chunk_size = 0;
for (AP4_Ordinal i=0; i<locators.ItemCount(); i++) {
AP4_SampleLocator& locator = locators[i];
if ((int)locator.m_TrakIndex != current_track ||
(int)locator.m_ChunkIndex != current_chunk) {
// start a new chunk for this track
current_chunk_offset += current_chunk_size;
current_chunk_size = 0;
current_track = locator.m_TrakIndex;
current_chunk = locator.m_ChunkIndex;
locator.m_SampleTable->SetChunkOffset(locator.m_ChunkIndex, current_chunk_offset);
}
AP4_Size sample_size;
TrackHandler* handler = m_TrackData[locator.m_TrakIndex].track_handler;
if (handler) {
sample_size = handler->GetProcessedSampleSize(locator.m_Sample);
locator.m_SampleTable->SetSampleSize(locator.m_SampleIndex, sample_size);
} else {
sample_size = locator.m_Sample.GetSize();
}
current_chunk_size += sample_size;
mdat_payload_size += sample_size;
}
// process the tracks (ex: sample descriptions processing)
for (AP4_Ordinal i=0; i<track_count; i++) {
TrackHandler* handler = m_TrackData[i].track_handler;
if (handler)
handler->ProcessTrack();
}
}
// finalize the processor
Finalize(top_level);
if (!fragments) {
// calculate the size of all atoms combined
AP4_UI64 atoms_size = 0;
top_level.GetChildren().Apply(AP4_AtomSizeAdder(atoms_size));
// see if we need a 64-bit or 32-bit mdat
AP4_Size mdat_header_size = AP4_ATOM_HEADER_SIZE;
if (mdat_payload_size+mdat_header_size > 0xFFFFFFFF) {
// we need a 64-bit size
mdat_header_size += 8;
}
// adjust the chunk offsets
for (AP4_Ordinal i=0; i<track_count; i++) {
AP4_TrakAtom* trak;
trak_atoms->Get(i, trak);
trak->AdjustChunkOffsets(atoms_size+mdat_header_size);
}
// write all atoms
top_level.GetChildren().Apply(AP4_AtomListWriter(output));
// write mdat header
if (mdat_payload_size) {
if (mdat_header_size == AP4_ATOM_HEADER_SIZE) {
// 32-bit size
output.WriteUI32((AP4_UI32)(mdat_header_size+mdat_payload_size));
output.WriteUI32(AP4_ATOM_TYPE_MDAT);
} else {
// 64-bit size
output.WriteUI32(1);
output.WriteUI32(AP4_ATOM_TYPE_MDAT);
output.WriteUI64(mdat_header_size+mdat_payload_size);
}
}
}
// write the samples
if (moov) {
if (!fragments) {
#if defined(AP4_DEBUG)
AP4_Position before;
output.Tell(before);
#endif
AP4_Sample sample;
AP4_DataBuffer data_in;
AP4_DataBuffer data_out;
for (unsigned int i=0; i<locators.ItemCount(); i++) {
AP4_SampleLocator& locator = locators[i];
locator.m_Sample.ReadData(data_in);
TrackHandler* handler = m_TrackData[locator.m_TrakIndex].track_handler;
if (handler) {
result = handler->ProcessSample(data_in, data_out);
if (AP4_FAILED(result)) return result;
output.Write(data_out.GetData(), data_out.GetDataSize());
} else {
output.Write(data_in.GetData(), data_in.GetDataSize());
}
// notify the progress listener
if (listener) {
listener->OnProgress(i+1, locators.ItemCount());
}
}
#if defined(AP4_DEBUG)
AP4_Position after;
output.Tell(after);
AP4_ASSERT(after-before == mdat_payload_size);
#endif
}
else
m_StreamData[0].stream = fragments;
// find the position of the sidx atom
AP4_Position sidx_position = 0;
if (sidx) {
for (AP4_List<AP4_Atom>::Item* item = top_level.GetChildren().FirstItem();
item;
item = item->GetNext()) {
AP4_Atom* atom = item->GetData();
if (atom->GetType() == AP4_ATOM_TYPE_SIDX) {
break;
}
sidx_position += atom->GetSize();
}
}
// process the fragments, if any
AP4_Array<AP4_Position> moof_offsets, mdat_offsets;
moof_offsets.SetItemCount(1);
mdat_offsets.SetItemCount(1);
while (frags.ItemCount() > 0)
{
for (AP4_List<AP4_AtomLocator>::Item *locator(frags.FirstItem()); locator; locator = locator->GetNext())
{
AP4_ContainerAtom *moof(AP4_DYNAMIC_CAST(AP4_ContainerAtom, locator->GetData()->m_Atom));
moof_offsets[0] = locator->GetData()->m_Offset;
mdat_offsets[0] = moof_offsets[0] + moof->GetSize() + AP4_ATOM_HEADER_SIZE;
result = ProcessFragment(moof, sidx, sidx_position, output, moof_offsets, mdat_offsets);
if (AP4_FAILED(result))
return result;
}
frags.DeleteReferences();
AP4_Atom* atom = NULL;
input.Tell(stream_offset);
if (AP4_SUCCEEDED(atom_factory.CreateAtomFromStream(input, atom)))
{
if (atom->GetType() == AP4_ATOM_TYPE_MOOF)
frags.Add(new AP4_AtomLocator(atom, stream_offset));
else
delete atom;
}
}
// update the mfra if we have one
if (mfra) {
for (AP4_List<AP4_Atom>::Item* mfra_item = mfra->GetChildren().FirstItem(); mfra_item; mfra_item = mfra_item->GetNext())
{
if (mfra_item->GetData()->GetType() != AP4_ATOM_TYPE_TFRA)
continue;
AP4_TfraAtom* tfra = AP4_DYNAMIC_CAST(AP4_TfraAtom, mfra_item->GetData());
if (tfra == NULL)
continue;
AP4_Array<AP4_TfraAtom::Entry>& entries = tfra->GetEntries();
AP4_Cardinal entry_count = entries.ItemCount();
for (unsigned int i = 0; i<entry_count; i++) {
entries[i].m_MoofOffset = FindFragmentMapEntry(entries[i].m_MoofOffset);
}
}
}
// update and re-write the sidx if we have one
if (sidx && sidx_position) {
AP4_Position where = 0;
output.Tell(where);
output.Seek(sidx_position);
result = sidx->Write(output);
if (AP4_FAILED(result)) return result;
output.Seek(where);
}
if (!fragments) {
// write the mfra atom at the end if we have one
if (mfra) {
mfra->Write(output);
}
}
// cleanup
for (AP4_Ordinal i=0; i<track_count; i++)
delete cursors[i].m_Locator.m_SampleTable;
m_TrackData.Clear();
delete[] cursors;
}
// cleanup
frags.DeleteReferences();
delete mfra;
return AP4_SUCCESS;
}