/*----------------------------------------------------------------------
| AP4_HintTrackReader::GetCurrentTimeStampMs
+---------------------------------------------------------------------*/
AP4_UI32
AP4_HintTrackReader::GetCurrentTimeStampMs()
{
return (AP4_UI32)AP4_ConvertTime(m_CurrentHintSample.GetCts(),
m_HintTrack.GetMediaTimeScale(),
1000);
}
/*----------------------------------------------------------------------
| AP4_Track::GetSampleIndexForTimeStampMs
+---------------------------------------------------------------------*/
AP4_Result
AP4_Track::GetSampleIndexForTimeStampMs(AP4_TimeStamp ts, AP4_Ordinal& index)
{
// convert the ts in the timescale of the track's media
ts = AP4_ConvertTime(ts, 1000, m_MediaTimeScale);
return m_SampleTable->GetSampleIndexForTimeStamp(ts, index);
}
/*----------------------------------------------------------------------
| AutoDetectAudioFragmentDuration
+---------------------------------------------------------------------*/
static unsigned int
AutoDetectAudioFragmentDuration(AP4_ByteStream& stream, TrackCursor* cursor)
{
// remember where we are in the stream
AP4_Position where = 0;
stream.Tell(where);
AP4_LargeSize stream_size = 0;
stream.GetSize(stream_size);
AP4_LargeSize bytes_available = stream_size-where;
AP4_UI64 fragment_count = 0;
AP4_UI32 last_fragment_size = 0;
AP4_Atom* atom = NULL;
while (AP4_SUCCEEDED(AP4_DefaultAtomFactory::Instance.CreateAtomFromStream(stream, bytes_available, atom))) {
if (atom && atom->GetType() == AP4_ATOM_TYPE_MOOF) {
AP4_ContainerAtom* moof = AP4_DYNAMIC_CAST(AP4_ContainerAtom, atom);
AP4_TfhdAtom* tfhd = AP4_DYNAMIC_CAST(AP4_TfhdAtom, moof->FindChild("traf/tfhd"));
if (tfhd && tfhd->GetTrackId() == cursor->m_Track->GetId()) {
++fragment_count;
AP4_TrunAtom* trun = AP4_DYNAMIC_CAST(AP4_TrunAtom, moof->FindChild("traf/trun"));
if (trun) {
last_fragment_size = trun->GetEntries().ItemCount();
}
}
}
delete atom;
atom = NULL;
}
// restore the stream to its original position
stream.Seek(where);
// decide if we can infer an fragment size
if (fragment_count == 0 || cursor->m_Samples->GetSampleCount() == 0) {
return 0;
}
// don't count the last fragment if we have more than one
if (fragment_count > 1 && last_fragment_size) {
--fragment_count;
}
if (fragment_count <= 1 || cursor->m_Samples->GetSampleCount() < last_fragment_size) {
last_fragment_size = 0;
}
AP4_Sample sample;
AP4_UI64 total_duration = 0;
for (unsigned int i=0; i<cursor->m_Samples->GetSampleCount()-last_fragment_size; i++) {
cursor->m_Samples->GetSample(i, sample);
total_duration += sample.GetDuration();
}
return (unsigned int)AP4_ConvertTime(total_duration/fragment_count, cursor->m_Track->GetMediaTimeScale(), 1000);
}
/*----------------------------------------------------------------------
| AP4_Track::SetMovieTimeScale
+---------------------------------------------------------------------*/
AP4_Result
AP4_Track::SetMovieTimeScale(AP4_UI32 time_scale)
{
// check that we can convert
if (m_MovieTimeScale == 0) return AP4_FAILURE;
// convert from one time scale to the other
m_TrakAtom->SetDuration(AP4_ConvertTime(m_TrakAtom->GetDuration(),
m_MovieTimeScale,
time_scale));
// keep the new movie timescale
m_MovieTimeScale = time_scale;
return AP4_SUCCESS;
}
int8_t Mp4Writer::WriteFile(int frameRate)
{
// frameRate should be in frames/second
// adjust the sample CTS/DTS offsets based on the sample orders
if (m_sample_orders.ItemCount() > 1) {
unsigned int start = 0;
for (unsigned int i=1; i<=m_sample_orders.ItemCount(); i++) {
if (i == m_sample_orders.ItemCount() || m_sample_orders[i].m_DisplayOrder == 0) {
// we got to the end of the GOP, sort it by display order
mp_sample_storage->SortSamples(&m_sample_orders[start], i-start);
start = i;
}
}
}
unsigned int max_delta = 0;
for (unsigned int i=0; i<m_sample_orders.ItemCount(); i++) {
if (m_sample_orders[i].m_DecodeOrder > i) {
unsigned int delta =m_sample_orders[i].m_DecodeOrder-i;
if (delta > max_delta) {
max_delta = delta;
}
}
}
for (unsigned int i=0; i<m_sample_orders.ItemCount(); i++) {
mp_sample_table->UseSample(m_sample_orders[i].m_DecodeOrder).SetCts(1000ULL*(AP4_UI64)(i+max_delta));
}
// check the video parameters
AP4_AvcSequenceParameterSet* sps = NULL;
for (unsigned int i=0; i<=AP4_AVC_SPS_MAX_ID; i++) {
if (m_parser.GetSequenceParameterSets()[i]) {
sps = m_parser.GetSequenceParameterSets()[i];
break;
}
}
if (sps == NULL) {
m_errorMsg = "ERROR: no sequence parameter set found in video";
return -1;
}
unsigned int video_width = 0;
unsigned int video_height = 0;
sps->GetInfo(video_width, video_height);
// collect the SPS and PPS into arrays
AP4_Array<AP4_DataBuffer> sps_array;
for (unsigned int i=0; i<=AP4_AVC_SPS_MAX_ID; i++) {
if (m_parser.GetSequenceParameterSets()[i]) {
sps_array.Append(m_parser.GetSequenceParameterSets()[i]->raw_bytes);
}
}
AP4_Array<AP4_DataBuffer> pps_array;
for (unsigned int i=0; i<=AP4_AVC_PPS_MAX_ID; i++) {
if (m_parser.GetPictureParameterSets()[i]) {
pps_array.Append(m_parser.GetPictureParameterSets()[i]->raw_bytes);
}
}
// setup the video the sample descripton
AP4_AvcSampleDescription* sample_description =
new AP4_AvcSampleDescription(AP4_SAMPLE_FORMAT_AVC1,
video_width,
video_height,
24,
"h264",
sps->profile_idc,
sps->level_idc,
sps->constraint_set0_flag<<7 |
sps->constraint_set1_flag<<6 |
sps->constraint_set2_flag<<5 |
sps->constraint_set3_flag<<4,
4,
sps_array,
pps_array);
mp_sample_table->AddSampleDescription(sample_description);
// TODO: set frame rate here
m_frameRate = frameRate * 1000;
AP4_UI32 movie_timescale = 1000;
AP4_UI32 media_timescale = m_frameRate;
AP4_UI64 video_track_duration = AP4_ConvertTime(1000*mp_sample_table->GetSampleCount(), media_timescale, movie_timescale);
AP4_UI64 video_media_duration = 1000*mp_sample_table->GetSampleCount();
// create a video track
AP4_Track* track = new AP4_Track(AP4_Track::TYPE_VIDEO,
mp_sample_table,
0, // auto-select track id
movie_timescale, // movie time scale
video_track_duration, // track duration
m_frameRate, // media time scale
video_media_duration, // media duration
"und", // language
video_width<<16, // width
video_height<<16 // height
);
// update the brands list
m_brands.Append(AP4_FILE_BRAND_AVC1);
mp_movie->AddTrack(track);
// open the output
AP4_Result result;
AP4_ByteStream* output = NULL;
result = AP4_FileByteStream::Create(m_outputFilename.c_str(),
AP4_FileByteStream::STREAM_MODE_WRITE, output);
if (AP4_FAILED(result)) {
m_errorMsg = "ERROR: cannot open output file";
return -1;
}
// create a multimedia file
AP4_File file(mp_movie);
// set the file type
file.SetFileType(AP4_FILE_BRAND_MP42, 1, &m_brands[0], m_brands.ItemCount());
// write the file to the output
AP4_FileWriter::Write(file, *output);
// cleanup
output->Release();
}
/*----------------------------------------------------------------------
| 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_Track::AP4_Track
+---------------------------------------------------------------------*/
AP4_Track::AP4_Track(Type type,
AP4_SampleTable* sample_table,
AP4_UI32 track_id,
AP4_UI32 movie_time_scale,
AP4_UI32 media_time_scale,
AP4_UI64 media_duration,
const char* language,
AP4_UI32 width,
AP4_UI32 height) :
m_TrakAtomIsOwned(true),
m_Type(type),
m_SampleTable(sample_table),
m_SampleTableIsOwned(false),
m_MovieTimeScale(movie_time_scale ?
movie_time_scale :
AP4_TRACK_DEFAULT_MOVIE_TIMESCALE),
m_MediaTimeScale(media_time_scale)
{
// compute the default volume value
unsigned int volume = 0;
if (type == TYPE_AUDIO) volume = 0x100;
// compute the handler type and name
AP4_Atom::Type hdlr_type;
const char* hdlr_name;
switch (type) {
case TYPE_AUDIO:
hdlr_type = AP4_HANDLER_TYPE_SOUN;
hdlr_name = "Bento4 Sound Handler";
break;
case TYPE_VIDEO:
hdlr_type = AP4_HANDLER_TYPE_VIDE;
hdlr_name = "Bento4 Video Handler";
break;
case TYPE_HINT:
hdlr_type = AP4_HANDLER_TYPE_HINT;
hdlr_name = "Bento4 Hint Handler";
break;
default:
hdlr_type = 0;
hdlr_name = NULL;
break;
}
// compute the track duration in units of the movie time scale
AP4_UI64 track_duration = AP4_ConvertTime(media_duration,
media_time_scale,
movie_time_scale);
// create a trak atom
m_TrakAtom = DNew AP4_TrakAtom(sample_table,
hdlr_type,
hdlr_name,
track_id,
0,
0,
track_duration,
media_time_scale,
media_duration,
volume,
language,
width,
height);
}
/*----------------------------------------------------------------------
| AP4_LinearReader::SeekTo
+---------------------------------------------------------------------*/
AP4_Result
AP4_LinearReader::SeekTo(AP4_UI32 time_ms, AP4_UI32* actual_time_ms)
{
if (actual_time_ms) *actual_time_ms = time_ms; // default
// we only support fragmented sources for now
if (!m_HasFragments) return AP4_ERROR_NOT_SUPPORTED;
// look for a fragment index
if (m_Mfra == NULL) {
if (m_FragmentStream) {
// get the size of the stream (needed)
AP4_LargeSize stream_size = 0;
m_FragmentStream->GetSize(stream_size);
if (stream_size > 12) {
// remember where we are
AP4_Position here;
m_FragmentStream->Tell(here);
// read the last 12 bytes
unsigned char mfro[12];
AP4_Result result = m_FragmentStream->Seek(stream_size-12);
if (AP4_SUCCEEDED(result)) {
result = m_FragmentStream->Read(mfro, 12);
}
if (AP4_SUCCEEDED(result) && mfro[0] == 'm' && mfro[1] == 'f' && mfro[2] == 'r' && mfro[3] == 'o') {
AP4_UI32 mfra_size = AP4_BytesToUInt32BE(&mfro[8]);
if ((AP4_LargeSize)mfra_size < stream_size) {
result = m_FragmentStream->Seek(stream_size-mfra_size);
if (AP4_SUCCEEDED(result)) {
AP4_Atom* mfra = NULL;
AP4_LargeSize available = mfra_size;
AP4_DefaultAtomFactory::Instance.CreateAtomFromStream(*m_FragmentStream, available, mfra);
m_Mfra = AP4_DYNAMIC_CAST(AP4_ContainerAtom, mfra);
}
}
}
if (AP4_SUCCEEDED(result)) {
result = m_FragmentStream->Seek(here);
}
}
}
}
// return now if we have not found an index
if (m_Mfra == NULL) {
return AP4_ERROR_NOT_SUPPORTED;
}
// look for the earliest fragment referenced by an entry with the largest timestamp that's
// before or equal to the requested time
int best_entry = -1;
for (unsigned t=0; t<m_Trackers.ItemCount(); t++) {
// find the tfra index for this track
AP4_TfraAtom* tfra = NULL;
for (AP4_List<AP4_Atom>::Item* item = m_Mfra->GetChildren().FirstItem();
item;
item = item->GetNext()) {
if (item->GetData()->GetType() == AP4_ATOM_TYPE_TFRA) {
AP4_TfraAtom* tfra_ = (AP4_TfraAtom*)item->GetData();
if (tfra_->GetTrackId() == m_Trackers[t]->m_Track->GetId()) {
tfra = tfra_;
break;
}
}
}
if (tfra == NULL) {
return AP4_ERROR_NOT_SUPPORTED;
}
AP4_Array<AP4_TfraAtom::Entry>& entries = tfra->GetEntries();
AP4_UI64 media_time = AP4_ConvertTime(time_ms, 1000, m_Trackers[t]->m_Track->GetMediaTimeScale());
int entry = -1;
for (int i=0; i<(int)entries.ItemCount(); i++) {
if (entries[i].m_Time > media_time) break;
entry = i;
}
if (entry >= 0) {
if (best_entry == -1) {
best_entry = entry;
} else if (entries[entry].m_MoofOffset < entries[best_entry].m_MoofOffset) {
best_entry = entry;
}
// update our position
if (best_entry >= 0) {
if (actual_time_ms) {
// report the actual time we found (in milliseconds)
*actual_time_ms = (AP4_UI32)AP4_ConvertTime(entries[best_entry].m_Time, m_Trackers[t]->m_Track->GetMediaTimeScale(), 1000);
}
m_NextFragmentPosition = entries[best_entry].m_MoofOffset;
}
}
}
// check that we found something
if (best_entry == -1) {
return AP4_FAILURE;
}
// flush any queued samples
FlushQueues();
// reset tracker states
for (unsigned int i=0; i<m_Trackers.ItemCount(); i++) {
delete m_Trackers[i]->m_SampleTable;
delete m_Trackers[i]->m_NextSample;
m_Trackers[i]->m_SampleTable = NULL;
m_Trackers[i]->m_NextSample = NULL;
m_Trackers[i]->m_NextSampleIndex = 0;
m_Trackers[i]->m_Eos = false;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| Fragment
+---------------------------------------------------------------------*/
static void
Fragment(AP4_File& input_file,
AP4_ByteStream& output_stream,
unsigned int fragment_duration,
AP4_UI32 timescale)
{
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);
// create a cusor list to keep track of the tracks we will read from
AP4_Array<TrackCursor*> cursors;
// add an output track for each track in the input file
for (AP4_List<AP4_Track>::Item* track_item = input_movie->GetTracks().FirstItem();
track_item;
track_item = track_item->GetNext()) {
AP4_Track* track = track_item->GetData();
TrackCursor* cursor = new TrackCursor();
cursor->m_TrackId = track->GetId();
cursor->m_Tfra->SetTrackId(track->GetId());
cursors.Append(cursor);
// create a sample table (with no samples) to hold the sample description
AP4_SyntheticSampleTable* sample_table = new AP4_SyntheticSampleTable();
for (unsigned int i=0; i<track->GetSampleDescriptionCount(); i++) {
AP4_SampleDescription* sample_description = track->GetSampleDescription(i);
sample_table->AddSampleDescription(sample_description, false);
}
// create the track
AP4_Track* output_track = new AP4_Track(track->GetType(),
sample_table,
cursor->m_TrackId,
timescale?timescale:1000,
AP4_ConvertTime(track->GetDuration(),
input_movie->GetTimeScale(),
timescale?timescale:1000),
timescale?timescale:track->GetMediaTimeScale(),
0,//track->GetMediaDuration(),
track->GetTrackLanguage(),
track->GetWidth(),
track->GetHeight());
output_movie->AddTrack(output_track);
result = cursor->SetTrack(track);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to read sample (%d)\n", result);
return;
}
// add a trex entry to the mvex container
AP4_TrexAtom* trex = new AP4_TrexAtom(cursor->m_TrackId,
1,
0,
0,
0);
mvex->AddChild(trex);
}
if (cursors.ItemCount() == 0) {
fprintf(stderr, "ERROR: no track found\n");
return;
}
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (cursors[i]->m_Track->GetType() == AP4_Track::TYPE_VIDEO) {
cursors[i]->m_TargetDuration = AP4_ConvertTime(fragment_duration>AP4_FRAGMENTER_FRAGMENT_DURATION_TOLERANCE ?
fragment_duration-AP4_FRAGMENTER_FRAGMENT_DURATION_TOLERANCE : 0,
1000,
cursors[i]->m_Track->GetMediaTimeScale());
} else {
cursors[i]->m_TargetDuration = AP4_ConvertTime(fragment_duration,
1000,
cursors[i]->m_Track->GetMediaTimeScale());
}
}
// update the mehd duration
mehd->SetDuration(output_movie->GetDuration());
// the mvex container to the moov container
output_movie->GetMoovAtom()->AddChild(mvex);
// write the ftyp atom
AP4_FtypAtom* ftyp = input_file.GetFileType();
if (ftyp) {
ftyp->Write(output_stream);
}
// write the moov atom
output_movie->GetMoovAtom()->Write(output_stream);
// write all the fragments
unsigned int sequence_number = 1;
for(;;) {
// select the next track to read from
TrackCursor* cursor = NULL;
AP4_UI64 min_dts = (AP4_UI64)(-1);
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
if (cursors[i]->m_Eos) continue;
AP4_UI64 dts = AP4_ConvertTime(cursors[i]->m_Sample.GetDts(),
cursors[i]->m_Track->GetMediaTimeScale(),
AP4_FRAGMENTER_BASE_TIMESCALE);
if (dts < min_dts) {
min_dts = dts;
cursor = cursors[i];
}
}
if (cursor == NULL) break; // all done
// compute the target end for the segment
cursor->m_EndDts = cursor->m_Sample.GetDts()+cursor->m_TargetDuration;
// emit a fragment for the selected track
if (Options.verbosity > 0) {
printf("fragment: track ID %d ", cursor->m_Track->GetId());
}
// remember the time and position of this fragment
AP4_Position moof_offset = 0;
output_stream.Tell(moof_offset);
cursor->m_Tfra->AddEntry(cursor->m_Timestamp, moof_offset);
// 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_TrackId,
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);
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);
// decide which samples go in this fragment
AP4_Array<AP4_UI32> sample_indexes;
unsigned int sample_count = 0;
AP4_Array<AP4_TrunAtom::Entry> trun_entries;
AP4_UI32 mdat_size = 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();
sample_indexes.SetItemCount(sample_count+1);
sample_indexes[sample_count] = cursor->m_SampleIndex;
mdat_size += trun_entry.sample_size;
// next sample
cursor->m_Timestamp += trun_entry.sample_duration;
cursor->m_SampleIndex++;
sample_count++;
if (cursor->m_SampleIndex >= cursor->m_Track->GetSampleCount()) {
cursor->m_Eos = true;
AP4_UI64 end_dts = cursor->m_Sample.GetDts()+cursor->m_Sample.GetDuration();
cursor->m_Sample.Reset();
cursor->m_Sample.SetDts(end_dts);
break;
}
result = cursor->m_Track->GetSample(cursor->m_SampleIndex, cursor->m_Sample);
if (AP4_FAILED(result)) {
cursor->m_Eos = true;
AP4_UI64 end_dts = cursor->m_Sample.GetDts()+cursor->m_Sample.GetDuration();
cursor->m_Sample.Reset();
cursor->m_Sample.SetDts(end_dts);
break;
}
if (cursor->m_Sample.IsSync()) {
if (cursor->m_Sample.GetDts() >= cursor->m_EndDts) {
break; // done with this segment
}
}
}
if (Options.verbosity) {
printf(" %d samples\n", sample_count);
}
// update moof and children
trun->SetEntries(trun_entries);
trun->SetDataOffset((AP4_UI32)moof->GetSize()+AP4_ATOM_HEADER_SIZE);
// write moof
moof->Write(output_stream);
// write mdat
output_stream.WriteUI32(mdat_size);
output_stream.WriteUI32(AP4_ATOM_TYPE_MDAT);
AP4_Sample sample;
AP4_DataBuffer sample_data;
for (unsigned int i=0; i<sample_indexes.ItemCount(); i++) {
result = cursor->m_Track->ReadSample(sample_indexes[i], sample, sample_data);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to read sample %d (%d)\n", sample_indexes[i], result);
return;
}
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;
}
}
// cleanup
delete moof;
}
// 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++) {
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
for (unsigned int i=0; i<cursors.ItemCount(); i++) {
delete cursors[i];
}
delete output_movie;
}
