vod_status_t
mss_packager_build_fragment_header(
request_context_t* request_context,
mpeg_stream_metadata_t* stream_metadata,
uint32_t segment_index,
size_t extra_traf_atoms_size,
write_extra_traf_atoms_callback_t write_extra_traf_atoms_callback,
void* write_extra_traf_atoms_context,
bool_t size_only,
vod_str_t* result,
size_t* total_fragment_size)
{
input_frame_t* last_frame;
input_frame_t* cur_frame;
size_t mdat_atom_size;
size_t trun_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;
trun_atom_size = mp4_builder_get_trun_atom_size(stream_metadata->media_info.media_type, stream_metadata->frame_count);
traf_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(tfhd_atom_t) +
trun_atom_size +
ATOM_HEADER_SIZE + sizeof(uuid_tfxd_atom_t) +
extra_traf_atoms_size;
moof_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(mfhd_atom_t)+
traf_atom_size;
result_size =
moof_atom_size +
ATOM_HEADER_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,
"mss_packager_build_fragment_header: vod_alloc failed");
return VOD_ALLOC_FAILED;
}
p = result->data;
// 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
switch (stream_metadata->media_info.media_type)
{
case MEDIA_TYPE_VIDEO:
p = mss_write_tfhd_atom(p, stream_metadata->media_info.track_id, 0x01010000);
break;
case MEDIA_TYPE_AUDIO:
p = mss_write_tfhd_atom(p, stream_metadata->media_info.track_id, 0x02000000);
break;
}
// moof.traf.trun
last_frame = stream_metadata->frames + stream_metadata->frame_count;
for (cur_frame = stream_metadata->frames; cur_frame < last_frame; cur_frame++)
{
cur_frame->duration = rescale_time(cur_frame->duration, stream_metadata->media_info.timescale, MSS_TIMESCALE);
}
p = mp4_builder_write_trun_atom(
p,
stream_metadata->media_info.media_type,
stream_metadata->frames,
stream_metadata->frame_count,
moof_atom_size + ATOM_HEADER_SIZE);
p = mss_write_uuid_tfxd_atom(p, stream_metadata);
// 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');
result->len = p - result->data;
if (result->len != result_size)
{
vod_log_error(VOD_LOG_ERR, request_context->log, 0,
"mss_packager_build_fragment_header: result length %uz is different than allocated length %uz",
result->len, result_size);
return VOD_UNEXPECTED;
}
return VOD_OK;
}
vod_status_t
mss_packager_build_fragment_header(
request_context_t* request_context,
media_set_t* media_set,
uint32_t segment_index,
size_t extra_traf_atoms_size,
mss_write_extra_traf_atoms_callback_t write_extra_traf_atoms_callback,
void* write_extra_traf_atoms_context,
bool_t size_only,
vod_str_t* result,
size_t* total_fragment_size)
{
segment_timing_info_t timing_info;
media_clip_filtered_t* cur_clip;
media_sequence_t* sequence = media_set->sequences;
input_frame_t* last_frame;
input_frame_t* cur_frame;
media_track_t* first_track = sequence->filtered_clips[0].first_track;
media_track_t* track;
uint32_t media_type = sequence->media_type;
size_t mdat_atom_size;
size_t trun_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 + sequence->total_frame_size;
trun_atom_size = mp4_builder_get_trun_atom_size(media_type, sequence->total_frame_count);
traf_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(tfhd_atom_t) +
trun_atom_size +
ATOM_HEADER_SIZE + sizeof(uuid_tfxd_atom_t) +
extra_traf_atoms_size;
if (media_set->type == MEDIA_SET_LIVE)
{
traf_atom_size += TFRF_ATOM_SIZE;
}
moof_atom_size =
ATOM_HEADER_SIZE +
ATOM_HEADER_SIZE + sizeof(mfhd_atom_t)+
traf_atom_size;
result_size =
moof_atom_size +
ATOM_HEADER_SIZE; // mdat
*total_fragment_size = result_size + sequence->total_frame_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,
"mss_packager_build_fragment_header: vod_alloc failed");
return VOD_ALLOC_FAILED;
}
p = result->data;
// 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
switch (media_type)
{
case MEDIA_TYPE_VIDEO:
p = mss_write_tfhd_atom(p, first_track->media_info.track_id, 0x01010000);
break;
case MEDIA_TYPE_AUDIO:
p = mss_write_tfhd_atom(p, first_track->media_info.track_id, 0x02000000);
break;
}
// moof.traf.trun
for (cur_clip = sequence->filtered_clips; cur_clip < sequence->filtered_clips_end; cur_clip++)
{
track = cur_clip->first_track;
cur_frame = track->first_frame;
last_frame = track->last_frame;
for (; cur_frame < last_frame; cur_frame++)
{
cur_frame->duration = rescale_time(cur_frame->duration, track->media_info.timescale, MSS_TIMESCALE);
cur_frame->pts_delay = rescale_time(cur_frame->pts_delay, track->media_info.timescale, MSS_TIMESCALE);
}
}
p = mp4_builder_write_trun_atom(
p,
sequence,
moof_atom_size + ATOM_HEADER_SIZE);
if (media_set->type == MEDIA_SET_LIVE)
{
// using only estimate timing info in live, since we don't have the accurate timing
// for the lookahead segments. the timestamp has to be consistent between segments/manifest
// otherwise some segments may be pulled more than once
timing_info.timestamp = mss_rescale_millis(media_set->segment_start_time);
timing_info.duration = mss_rescale_millis(media_set->segmenter_conf->segment_duration);
p = mss_write_uuid_tfxd_atom(p, &timing_info);
p = mss_write_uuid_tfrf_atom(p, &timing_info);
}
else
{
mss_get_segment_timing_info(sequence, &timing_info);
p = mss_write_uuid_tfxd_atom(p, &timing_info);
}
// 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);
}
// mdat
write_atom_header(p, mdat_atom_size, 'm', 'd', 'a', 't');
result->len = p - result->data;
if (result->len != result_size)
{
vod_log_error(VOD_LOG_ERR, request_context->log, 0,
"mss_packager_build_fragment_header: result length %uz is different than allocated length %uz",
result->len, result_size);
return VOD_UNEXPECTED;
}
return VOD_OK;
}
