vod_status_t
dash_packager_build_fragment_header(
request_context_t* request_context,
media_set_t* media_set,
uint32_t segment_index,
uint32_t sample_description_index,
dash_fragment_header_extensions_t* extensions,
bool_t size_only,
vod_str_t* result,
size_t* total_fragment_size)
{
media_sequence_t* sequence = &media_set->sequences[0];
media_track_t* first_track = sequence->filtered_clips[0].first_track;
uint64_t earliest_pres_time = dash_packager_get_earliest_pres_time(media_set, first_track);
sidx_params_t sidx_params;
size_t first_frame_offset;
size_t mdat_atom_size;
size_t trun_atom_size;
size_t tfhd_atom_size;
size_t moof_atom_size;
size_t traf_atom_size;
size_t result_size;
u_char* p;
// calculate sizes
dash_packager_init_sidx_params(media_set, sequence, &sidx_params);
mdat_atom_size = ATOM_HEADER_SIZE + sequence->total_frame_size;
if (extensions->mdat_prefix_writer != NULL)
{
mdat_atom_size += extensions->mdat_prefix_writer->atom_size;
}
trun_atom_size = mp4_builder_get_trun_atom_size(first_track->media_info.media_type, sequence->total_frame_count);
tfhd_atom_size = ATOM_HEADER_SIZE + sizeof(tfhd_atom_t);
if (sample_description_index > 0)
{
tfhd_atom_size += sizeof(uint32_t);
}
traf_atom_size =
ATOM_HEADER_SIZE +
tfhd_atom_size +
ATOM_HEADER_SIZE + (earliest_pres_time > UINT_MAX ? sizeof(tfdt64_atom_t) : sizeof(tfdt_atom_t)) +
trun_atom_size +
extensions->extra_traf_atoms_size;
moof_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(mfhd_atom_t)+
traf_atom_size;
*total_fragment_size =
sizeof(styp_atom) +
ATOM_HEADER_SIZE + (sidx_params.earliest_pres_time > UINT_MAX ? sizeof(sidx64_atom_t) : sizeof(sidx_atom_t)) +
moof_atom_size +
mdat_atom_size;
result_size = *total_fragment_size - sequence->total_frame_size;
// head request optimization
if (size_only)
{
return VOD_OK;
}
// allocate the buffer
p = vod_alloc(request_context->pool, result_size);
if (p == NULL)
{
vod_log_debug0(VOD_LOG_DEBUG_LEVEL, request_context->log, 0,
"dash_packager_build_fragment_header: vod_alloc failed");
return VOD_ALLOC_FAILED;
}
result->data = p;
// styp
p = vod_copy(p, styp_atom, sizeof(styp_atom));
// sidx
if (sidx_params.earliest_pres_time > UINT_MAX)
{
p = dash_packager_write_sidx64_atom(p, &sidx_params, moof_atom_size + mdat_atom_size);
}
else
{
p = dash_packager_write_sidx_atom(p, &sidx_params, moof_atom_size + mdat_atom_size);
}
// moof
write_atom_header(p, moof_atom_size, 'm', 'o', 'o', 'f');
// moof.mfhd
p = mp4_builder_write_mfhd_atom(p, segment_index);
// moof.traf
write_atom_header(p, traf_atom_size, 't', 'r', 'a', 'f');
// moof.traf.tfhd
p = dash_packager_write_tfhd_atom(p, first_track->media_info.track_id, sample_description_index);
// moof.traf.tfdt
if (earliest_pres_time > UINT_MAX)
{
p = dash_packager_write_tfdt64_atom(p, earliest_pres_time);
}
else
{
p = dash_packager_write_tfdt_atom(p, (uint32_t)earliest_pres_time);
}
// moof.traf.trun
first_frame_offset = moof_atom_size + ATOM_HEADER_SIZE;
if (extensions->mdat_prefix_writer != NULL)
{
first_frame_offset += extensions->mdat_prefix_writer->atom_size;
}
p = mp4_builder_write_trun_atom(
p,
sequence,
first_frame_offset);
// moof.traf.xxx
if (extensions->write_extra_traf_atoms_callback != NULL)
{
p = extensions->write_extra_traf_atoms_callback(extensions->write_extra_traf_atoms_context, p, moof_atom_size + ATOM_HEADER_SIZE);
}
// mdat
write_atom_header(p, mdat_atom_size, 'm', 'd', 'a', 't');
// mdat prefix
if (extensions->mdat_prefix_writer != NULL)
{
p = extensions->mdat_prefix_writer->write(extensions->mdat_prefix_writer->context, p);
}
result->len = p - result->data;
if (result->len != result_size)
{
vod_log_error(VOD_LOG_ERR, request_context->log, 0,
"dash_packager_build_fragment_header: result length %uz exceeded allocated length %uz",
result->len, result_size);
return VOD_UNEXPECTED;
}
return VOD_OK;
}
vod_status_t
dash_packager_build_fragment_header(
request_context_t* request_context,
mpeg_stream_metadata_t* stream_metadata,
uint32_t segment_index,
uint32_t sample_description_index,
size_t extra_traf_atoms_size,
write_extra_traf_atoms_callback_t write_extra_traf_atoms_callback,
void* write_extra_traf_atoms_context,
atom_writer_t* mdat_prefix_writer,
bool_t size_only,
vod_str_t* result,
size_t* total_fragment_size)
{
uint64_t earliest_pres_time = dash_packager_get_earliest_pres_time(stream_metadata);
size_t first_frame_offset;
size_t mdat_atom_size;
size_t trun_atom_size;
size_t tfhd_atom_size;
size_t moof_atom_size;
size_t traf_atom_size;
size_t result_size;
u_char* p;
// calculate sizes
mdat_atom_size = ATOM_HEADER_SIZE + stream_metadata->total_frames_size;
if (mdat_prefix_writer != NULL)
{
mdat_atom_size += mdat_prefix_writer->atom_size;
}
trun_atom_size = mp4_builder_get_trun_atom_size(stream_metadata->media_info.media_type, stream_metadata->frame_count);
tfhd_atom_size = ATOM_HEADER_SIZE + sizeof(tfhd_atom_t);
if (sample_description_index > 0)
{
tfhd_atom_size += sizeof(uint32_t);
}
traf_atom_size =
ATOM_HEADER_SIZE +
tfhd_atom_size +
ATOM_HEADER_SIZE + (earliest_pres_time > UINT_MAX ? sizeof(tfdt64_atom_t) : sizeof(tfdt_atom_t)) +
trun_atom_size +
extra_traf_atoms_size;
moof_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(mfhd_atom_t)+
traf_atom_size;
result_size =
sizeof(styp_atom)+
ATOM_HEADER_SIZE + (earliest_pres_time > UINT_MAX ? sizeof(sidx64_atom_t) : sizeof(sidx_atom_t)) +
moof_atom_size +
mdat_atom_size - stream_metadata->total_frames_size; // mdat
*total_fragment_size = result_size + stream_metadata->total_frames_size;
// head request optimization
if (size_only)
{
return VOD_OK;
}
// allocate the buffer
result->data = vod_alloc(request_context->pool, result_size);
if (result->data == NULL)
{
vod_log_debug0(VOD_LOG_DEBUG_LEVEL, request_context->log, 0,
"dash_packager_build_fragment_header: vod_alloc failed");
return VOD_ALLOC_FAILED;
}
// styp
p = vod_copy(result->data, styp_atom, sizeof(styp_atom));
// sidx
if (earliest_pres_time > UINT_MAX)
{
p = dash_packager_write_sidx64_atom(p, stream_metadata, earliest_pres_time, moof_atom_size + mdat_atom_size);
}
else
{
p = dash_packager_write_sidx_atom(p, stream_metadata, (uint32_t)earliest_pres_time, moof_atom_size + mdat_atom_size);
}
// moof
write_atom_header(p, moof_atom_size, 'm', 'o', 'o', 'f');
// moof.mfhd
p = mp4_builder_write_mfhd_atom(p, segment_index);
// moof.traf
write_atom_header(p, traf_atom_size, 't', 'r', 'a', 'f');
// moof.traf.tfhd
p = dash_packager_write_tfhd_atom(p, stream_metadata->media_info.track_id, sample_description_index);
// moof.traf.tfdt
if (earliest_pres_time > UINT_MAX)
{
p = dash_packager_write_tfdt64_atom(p, earliest_pres_time);
}
else
{
p = dash_packager_write_tfdt_atom(p, (uint32_t)earliest_pres_time);
}
// moof.traf.trun
first_frame_offset = moof_atom_size + ATOM_HEADER_SIZE;
if (mdat_prefix_writer != NULL)
{
first_frame_offset += mdat_prefix_writer->atom_size;
}
p = mp4_builder_write_trun_atom(
p,
stream_metadata->media_info.media_type,
stream_metadata->frames,
stream_metadata->frame_count,
first_frame_offset);
// moof.traf.xxx
if (write_extra_traf_atoms_callback != NULL)
{
p = write_extra_traf_atoms_callback(write_extra_traf_atoms_context, p, moof_atom_size + ATOM_HEADER_SIZE);
}
// mdat
write_atom_header(p, mdat_atom_size, 'm', 'd', 'a', 't');
// mdat prefix
if (mdat_prefix_writer != NULL)
{
p = mdat_prefix_writer->write(mdat_prefix_writer->context, p);
}
result->len = p - result->data;
if (result->len != result_size)
{
vod_log_error(VOD_LOG_ERR, request_context->log, 0,
"dash_packager_build_fragment_header: result length %uz exceeded allocated length %uz",
result->len, result_size);
return VOD_UNEXPECTED;
}
return VOD_OK;
}