extern int mp4_split(struct mp4_context_t* mp4_context,
unsigned int* trak_sample_start,
unsigned int* trak_sample_end,
mp4_split_options_t const* options)
{
int result;
float start_time = options->start;
float end_time = options->end;
// moov_build_index(mp4_context, mp4_context->moov);
{
struct moov_t const* moov = mp4_context->moov;
long moov_time_scale = moov->mvhd_->timescale_;
int64_t start = (int64_t)(start_time * moov_time_scale + 0.5f);
int64_t end = (int64_t)(end_time * moov_time_scale + 0.5f);
// for every trak, convert seconds to sample (time-to-sample).
// adjust sample to keyframe
result = get_aligned_start_and_end(mp4_context, start, end,
trak_sample_start, trak_sample_end);
}
return result;
}
extern int mp4_split(struct mp4_context_t* mp4_context,
unsigned int* trak_sample_start,
unsigned int* trak_sample_end,
mp4_split_options_t const* options)
{
int result;
float start_time = options->start;
float end_time = options->end;
moov_build_index(mp4_context, mp4_context->moov);
{
struct moov_t const* moov = mp4_context->moov;
long moov_time_scale = moov->mvhd_->timescale_;
unsigned int start = (unsigned int)(start_time * moov_time_scale + 0.5f);
unsigned int end = (unsigned int)(end_time * moov_time_scale + 0.5f);
// for every trak, convert seconds to sample (time-to-sample).
// adjust sample to keyframe
result = get_aligned_start_and_end(mp4_context, start, end,
trak_sample_start, trak_sample_end);
if (options->exact){
// now we need to find the audio track and RESET *its* trak_sample_start
// time to the exact start time we want, regardless of keyframes
unsigned int i=0;
for(i=0; i != moov->tracks_; ++i){
struct trak_t* trak = moov->traks_[i];
if (trak->mdia_->hdlr_->handler_type_ == FOURCC('s','o','u','n')){
// the FOURCC is soun(d) AKA audio track
long trak_time_scale = trak->mdia_->mdhd_->timescale_;
struct stts_t* stts = trak->mdia_->minf_->stbl_->stts_;
unsigned int start_exact_time_sample = stts_get_sample(stts, moov_time_to_trak_time((options->start * moov_time_scale), moov_time_scale, trak_time_scale));
MP4_WARNING("FFGOP: AUDIO REWRITING trak_sample_start[%i]: %u => %u\n", i, trak_sample_start[i], start_exact_time_sample);
trak_sample_start[i] = start_exact_time_sample;
}
}
}
}
return result;
}
