extern int output_mp4(struct mp4_context_t* mp4_context,
unsigned int const* trak_sample_start,
unsigned int const* trak_sample_end,
struct bucket_t** buckets,
struct mp4_split_options_t* options)
{
unsigned int i;
uint64_t mdat_start = mp4_context->mdat_atom.start_;
uint64_t mdat_size = mp4_context->mdat_atom.size_;
int64_t offset;
struct moov_t* moov = mp4_context->moov;
// unsigned char* moov_data = mp4_context->moov_data;
unsigned char* moov_data = (unsigned char*)
malloc((size_t)mp4_context->moov_atom.size_ + ATOM_PREAMBLE_SIZE + 1024);
uint64_t moov_size;
long moov_time_scale = moov->mvhd_->timescale_;
uint64_t skip_from_start = UINT64_MAX;
uint64_t end_offset = 0;
uint64_t moov_duration = 0;
#if 1
uint64_t new_mdat_start = 0;
{
static char const free_data[] = {
0x0, 0x0, 0x0, 42, 'f', 'r', 'e', 'e',
'v', 'i', 'd', 'e', 'o', ' ', 's', 'e',
'r', 'v', 'e', 'd', ' ', 'b', 'y', ' ',
'm', 'o', 'd', '_', 'h', '2', '6', '4',
'_', 's', 't', 'r', 'e', 'a', 'm', 'i',
'n', 'g'
};
uint32_t size_of_header = (uint32_t)mp4_context->ftyp_atom.size_ +
sizeof(free_data);
unsigned char* buffer = (unsigned char*)malloc(size_of_header);
if(mp4_context->ftyp_atom.size_)
{
fseeko(mp4_context->infile, mp4_context->ftyp_atom.start_, SEEK_SET);
if(fread(buffer, (off_t)mp4_context->ftyp_atom.size_, 1, mp4_context->infile) != 1)
{
MP4_ERROR("%s", "Error reading ftyp atom\n");
free(buffer);
return 0;
}
}
// copy free data
memcpy(buffer + mp4_context->ftyp_atom.size_, free_data,
sizeof(free_data));
if(options->output_format == OUTPUT_FORMAT_MP4)
{
bucket_t* bucket = bucket_init_memory(buffer, size_of_header);
bucket_insert_tail(buckets, bucket);
}
free(buffer);
new_mdat_start += size_of_header;
}
// new_mdat_start += mp4_context->moov_atom.size_;
#endif
offset = new_mdat_start - mp4_context->mdat_atom.start_;
// subtract old moov size
// offset -= mp4_context->moov_atom.size_;
for(i = 0; i != moov->tracks_; ++i)
{
struct trak_t* trak = moov->traks_[i];
struct stbl_t* stbl = trak->mdia_->minf_->stbl_;
unsigned int start_sample = trak_sample_start[i];
unsigned int end_sample = trak_sample_end[i];
if (options->exact)
trak_fast_forward_first_partial_GOP(mp4_context, options, trak, start_sample);
trak_update_index(mp4_context, trak, start_sample, end_sample);
if(trak->samples_size_ == 0)
{
MP4_WARNING("Trak %u contains no samples. Maybe a fragmented file?", i);
return 1;
}
{
uint64_t skip =
trak->samples_[start_sample].pos_ - trak->samples_[0].pos_;
if(skip < skip_from_start)
skip_from_start = skip;
MP4_INFO("Trak can skip %"PRIu64" bytes\n", skip);
if(end_sample != trak->samples_size_)
{
uint64_t end_pos = trak->samples_[end_sample].pos_;
if(end_pos > end_offset)
end_offset = end_pos;
MP4_INFO("New endpos=%"PRIu64"\n", end_pos);
MP4_INFO("Trak can skip %"PRIu64" bytes at end\n",
mdat_start + mdat_size - end_offset);
}
}
{
// fixup trak (duration)
uint64_t trak_duration = stts_get_duration(stbl->stts_);
long trak_time_scale = trak->mdia_->mdhd_->timescale_;
{
uint64_t duration = trak_time_to_moov_time(trak_duration,
moov_time_scale, trak_time_scale);
trak->mdia_->mdhd_->duration_= trak_duration;
trak->tkhd_->duration_ = duration;
MP4_INFO("trak: new_duration=%"PRIu64"\n", duration);
if(duration > moov_duration)
moov_duration = duration;
}
}
// MP4_INFO("stco.size=%d, ", read_int32(stbl->stco_ + 4));
// MP4_INFO("stts.size=%d samples=%d\n", read_int32(stbl->stts_ + 4), stts_get_samples(stbl->stts_));
// MP4_INFO("stsz.size=%d\n", read_int32(stbl->stsz_ + 8));
// MP4_INFO("stsc.samples=%d\n", stsc_get_samples(stbl->stsc_));
}
moov->mvhd_->duration_ = moov_duration;
MP4_INFO("moov: new_duration=%.2f seconds\n", moov_duration / (float)moov_time_scale);
// subtract bytes we skip at the front of the mdat atom
offset -= skip_from_start;
MP4_INFO("%s", "moov: writing header\n");
moov_write(moov, moov_data);
moov_size = read_32(moov_data);
// add new moov size
offset += moov_size;
MP4_INFO("shifting offsets by %"PRId64"\n", offset);
moov_shift_offsets_inplace(moov, offset);
// traffic shaping: create offsets for each second
create_traffic_shaping(moov,
trak_sample_start,
trak_sample_end,
offset,
options);
#ifdef COMPRESS_MOOV_ATOM
if(!options->client_is_flash)
{
compress_moov(mp4_context, moov, moov_data, &moov_size);
}
#endif
if(end_offset != 0)
{
MP4_INFO("mdat_size=%"PRId64" end_offset=%"PRId64"\n",
mdat_size, end_offset);
mdat_size = end_offset - mdat_start;
}
mdat_start += skip_from_start;
mdat_size -= skip_from_start;
MP4_INFO("mdat_bucket(%"PRId64", %"PRId64")\n", mdat_start, mdat_size);
bucket_insert_tail(buckets, bucket_init_memory(moov_data, moov_size));
free(moov_data);
{
struct mp4_atom_t mdat_atom;
mdat_atom.type_ = FOURCC('m', 'd', 'a', 't');
mdat_atom.short_size_ = 0; // TODO: use original small/wide mdat box
if(options->adaptive)
{
// empty mdat atom
mdat_atom.size_ = ATOM_PREAMBLE_SIZE;
}
else
{
mdat_atom.size_ = mdat_size;
}
{
unsigned char buffer[32];
int mdat_header_size = mp4_atom_write_header(buffer, &mdat_atom);
bucket_insert_tail(buckets,
bucket_init_memory(buffer, mdat_header_size));
if(mdat_atom.size_ - mdat_header_size)
{
bucket_insert_tail(buckets,
bucket_init_file(mdat_start + mdat_header_size,
mdat_atom.size_ - mdat_header_size));
}
}
}
return 1;
}
static int moof_create(struct mp4_context_t const* mp4_context,
struct moov_t* fmoov,
struct woov_t* woov,
struct moof_t* moof,
struct mfra_t* mfra,
uint64_t moof_offset,
unsigned int seq,
struct bucket_t** buckets,
int output_raw)
{
uint32_t mdat_size = ATOM_PREAMBLE_SIZE;
bucket_t* mdat_bucket = 0;
unsigned int i = 0;
uint64_t start_time = 0, end_time = 0;
unsigned int start=0, end=0;
if(!output_raw)
{
unsigned char mdat_buffer[32];
mp4_atom_t mdat_atom;
int mdat_header_size;
mdat_atom.type_ = FOURCC('m', 'd', 'a', 't');
mdat_atom.short_size_ = 0;
mdat_header_size = mp4_atom_write_header(mdat_buffer, &mdat_atom);
mdat_bucket = bucket_init_memory(mdat_buffer, mdat_header_size);
bucket_insert_tail(buckets, mdat_bucket);
}
moof->mfhd_ = mfhd_init();
moof->mfhd_->sequence_number_ = seq;
for(i = 0;i < fmoov->tracks_; i++)
{
uint32_t trun_mdat_size=0;
struct trak_t * trak = fmoov->traks_[i];
struct stsd_t const* stsd = trak->mdia_->minf_->stbl_->stsd_;
struct sample_entry_t const* sample_entry = &stsd->sample_entries_[0];
// int is_avc = sample_entry->fourcc_ == FOURCC('a', 'v', 'c', '1');
struct traf_t* traf = traf_init();
moof->trafs_[moof->tracks_] = traf;
++moof->tracks_;
start = trak->smoothes_[moof->mfhd_->sequence_number_-1].start;
end = trak->smoothes_[moof->mfhd_->sequence_number_].start;
{
// struct ctts_t const* ctts = trak->mdia_->minf_->stbl_->ctts_;
unsigned int trun_index = 0;
unsigned int s;
struct bucket_t* bucket_prev = 0;
traf->tfhd_ = tfhd_init();
// 0x000020 = default-sample-flags present
traf->tfhd_->flags_ = 0x000020;
traf->tfhd_->track_id_ = trak->tkhd_->track_id_;
// sample_degradation_priority
traf->tfhd_->default_sample_flags_ = 0x000000;
// sample_is_difference_sample
if(trak->mdia_->hdlr_->handler_type_ == FOURCC('v', 'i', 'd', 'e'))
{
traf->tfhd_->default_sample_flags_ |= (1 << 16);
}
traf->trun_ = trun_init();
// 0x0001 = data-offset is present
// 0x0004 = first_sample_flags is present
// 0x0100 = sample-duration is present
// 0x0200 = sample-size is present
traf->trun_->flags_ = 0x000305;
// 0x0800 = sample-composition-time-offset is present
// if(ctts)
{
traf->trun_->flags_ |= 0x000800;
}
traf->trun_->sample_count_ = end - start;
// traf->trun_->data_offset_ = // set below
traf->trun_->first_sample_flags_= 0x00000000;
traf->trun_->table_ = (trun_table_t*)malloc(traf->trun_->sample_count_ * sizeof(trun_table_t));
// traf->trun_->trak_ = trak;
// traf->trun_->start_ = start;
// traf->trun_->uuid0_pts_ = trak_time_to_moov_time(
// trak->samples_[start].pts_, 10000000, trak->mdia_->mdhd_->timescale_);
for(s = start; s != end; ++s)
{
uint64_t pts1 = trak->samples_[s + 1].pts_;
uint64_t pts0 = trak->samples_[s + 0].pts_;
unsigned int sample_duration = (unsigned int)(pts1 - pts0);
uint64_t sample_pos = trak->samples_[s].pos_;
unsigned int sample_size = trak->samples_[s].size_;
unsigned int cto = trak->samples_[s].cto_;
traf->trun_->table_[trun_index].sample_duration_ = sample_duration;
traf->trun_->table_[trun_index].sample_size_ = sample_size;
traf->trun_->table_[trun_index].sample_composition_time_offset_ = cto;
MP4_INFO(
"frame=%u pts=%"PRIi64" cto=%u duration=%u offset=%"PRIu64" size=%u\n",
s,
trak->samples_[s].pts_,
trak->samples_[s].cto_,
sample_duration,
sample_pos, sample_size);
if(trak->mdia_->hdlr_->handler_type_ == FOURCC('v', 'i', 'd', 'e'))
{
#if 0
if(bucket_prev == NULL)
{
// TODO: return error when no SPS and PPS are available
if(is_avc)
{
unsigned char* buffer;
unsigned char* p;
unsigned int sps_pps_size =
sample_entry->nal_unit_length_ + sample_entry->sps_length_ +
sample_entry->nal_unit_length_ + sample_entry->pps_length_;
if(sps_pps_size == 0)
{
MP4_ERROR("%s", "[Error] No SPS or PPS available\n");
return 0;
}
buffer = (unsigned char*)malloc(sps_pps_size);
p = buffer;
// sps
p = write_32(p, 0x00000001);
memcpy(p, sample_entry->sps_, sample_entry->sps_length_);
p += sample_entry->sps_length_;
// pps
p = write_32(p, 0x00000001);
memcpy(p, sample_entry->pps_, sample_entry->pps_length_);
p += sample_entry->pps_length_;
bucket_insert_tail(buckets, bucket_init_memory(buffer, sps_pps_size));
free(buffer);
traf->trun_->table_[trun_index].sample_size_ += sps_pps_size;
mdat_size += sps_pps_size;
trun_mdat_size += sps_pps_size;
}
}
#endif
#if 0
if(is_avc)
{
static const char nal_marker[4] = { 0, 0, 0, 1 };
uint64_t first = sample_pos;
uint64_t last = sample_pos + sample_size;
while(first != last)
{
unsigned char buffer[4];
unsigned int nal_size;
bucket_insert_tail(buckets, bucket_init_memory(nal_marker, 4));
if(fseeko(mp4_context->infile, first, SEEK_SET) != 0)
{
MP4_ERROR("%s", "Reached end of file prematurely\n");
return 0;
}
if(fread(buffer, sample_entry->nal_unit_length_, 1, mp4_context->infile) != 1)
{
MP4_ERROR("%s", "Error reading NAL size\n");
return 0;
}
nal_size = read_n(buffer, sample_entry->nal_unit_length_ * 8);
if(nal_size == 0)
{
MP4_ERROR("%s", "Invalid NAL size (0)\n");
return 0;
}
bucket_prev = bucket_init_file(first + sample_entry->nal_unit_length_, nal_size);
bucket_insert_tail(buckets, bucket_prev);
first += sample_entry->nal_unit_length_ + nal_size;
}
}
else
#endif
{
// try to merge buckets
if(bucket_prev &&
sample_pos == bucket_prev->offset_ + bucket_prev->size_)
{
bucket_prev->size_ += sample_size;
}
else
{
bucket_prev = bucket_init_file(sample_pos, sample_size);
bucket_insert_tail(buckets, bucket_prev);
}
}
} else
if(trak->mdia_->hdlr_->handler_type_ == FOURCC('s', 'o', 'u', 'n'))
{
// ADTS frame header
if(sample_entry->wFormatTag == 0x00ff && output_raw)
{
unsigned char buffer[7];
sample_entry_get_adts(sample_entry, sample_size, buffer);
bucket_insert_tail(buckets, bucket_init_memory(buffer, 7));
traf->trun_->table_[trun_index].sample_size_ += 7;
mdat_size += 7;
trun_mdat_size += 7;
bucket_prev = NULL;
}
// try to merge buckets
if(bucket_prev &&
sample_pos == bucket_prev->offset_ + bucket_prev->size_)
{
bucket_prev->size_ += sample_size;
}
else
{
bucket_prev = bucket_init_file(sample_pos, sample_size);
bucket_insert_tail(buckets, bucket_prev);
}
}
mdat_size += sample_size;
trun_mdat_size += sample_size;
++trun_index;
{
// update woov track samples
woov->moov->traks_[moof->tracks_-1]->samples_[woov->moov->traks_[moof->tracks_-1]->samples_size_++]=trak->samples_[s];
woov->moov->traks_[moof->tracks_-1]->samples_[woov->moov->traks_[moof->tracks_-1]->samples_size_]=trak->samples_[s+1];
}
}
{
struct tfra_t* tfra = mfra->tfras_[moof->tracks_-1];
tfra_table_t* table = &tfra->table_[moof->mfhd_->sequence_number_-1];
table->time_ = trak->samples_[start].pts_;
table->moof_offset_ = moof_offset;
table->traf_number_ = moof->tracks_-1;
table->trun_number_ = 0;
table->sample_number_ = 0;
stco_add_chunk(woov->moov->traks_[moof->tracks_-1]->mdia_->minf_->stbl_->stco_, woov->mdat_size);
woov->mdat_size += trun_mdat_size;
stsc_add_chunk(woov->moov->traks_[moof->tracks_-1]->mdia_->minf_->stbl_->stsc_,
woov->moov->traks_[moof->tracks_-1]->mdia_->minf_->stbl_->stco_->entries_-1, end-start, 1);
}
// update size of mdat atom
if(mdat_bucket)
{
write_32((unsigned char*)mdat_bucket->buf_, mdat_size);
}
}
}
return 1;
}