int64_t chunk_number = frame_number / zmpeg3_t::AUDIO_CHUNKSIZE;
if(chunk_number >= file->atrack[0]->total_sample_offsets)
chunk_number = file->atrack[0]->total_sample_offsets - 1;
int64_t chunk_number = frame_number / zmpeg3_t::AUDIO_CHUNKSIZE;
if(chunk_number >= file->atrack[0]->total_sample_offsets)
chunk_number = file->atrack[0]->total_sample_offsets - 1;