C++ AP4_Sample::GetCtsDelta方法代码示例

/*----------------------------------------------------------------------
|   AP4_Track::Clone
+---------------------------------------------------------------------*/
AP4_Track* 
AP4_Track::Clone(AP4_Result* result)
{
    AP4_SyntheticSampleTable* sample_table = new AP4_SyntheticSampleTable();
    
    // default return value
    if (result) *result = AP4_SUCCESS;
    
    // add clones of the sample descriptions to the new sample table
    for (unsigned int i=0; ;i++) {
        AP4_SampleDescription* sample_description = GetSampleDescription(i);
        if (sample_description == NULL) break;
        sample_table->AddSampleDescription(sample_description->Clone());
    }

    AP4_Sample  sample;
    AP4_Ordinal index = 0;
    while (AP4_SUCCEEDED(GetSample(index, sample))) {
        AP4_ByteStream* data_stream;
        data_stream = sample.GetDataStream();
        sample_table->AddSample(*data_stream,
                                sample.GetOffset(),
                                sample.GetSize(),
                                sample.GetDuration(),
                                sample.GetDescriptionIndex(),
                                sample.GetDts(),
                                sample.GetCtsDelta(),
                                sample.IsSync());
        AP4_RELEASE(data_stream); // release our ref, the table has kept its own ref.
        index++;
    }    
    
    // create the cloned track
    AP4_Track* clone = new AP4_Track(GetType(),
                                     sample_table,
                                     GetId(),
                                     GetMovieTimeScale(),
                                     GetDuration(),
                                     GetMediaTimeScale(),
                                     GetMediaDuration(),
                                     GetTrackLanguage(),
                                     GetWidth(),
                                     GetHeight());
                                     
    return clone;
}

/*----------------------------------------------------------------------
|   AP4_SampleTable::GenerateStblAtom
+---------------------------------------------------------------------*/
AP4_Result 
AP4_SampleTable::GenerateStblAtom(AP4_ContainerAtom*& stbl)
{
    // create the stbl container
    stbl = new AP4_ContainerAtom(AP4_ATOM_TYPE_STBL);

    // create the stsd atom
    AP4_StsdAtom* stsd = new AP4_StsdAtom(this);

    // create the stsz atom
    AP4_StszAtom* stsz = new AP4_StszAtom();

    // create the stsc atom
    AP4_StscAtom* stsc = new AP4_StscAtom();

    // create the stts atom
    AP4_SttsAtom* stts = new AP4_SttsAtom();

    // create the stss atom
    AP4_StssAtom* stss = new AP4_StssAtom();
    
    // declare the ctts atom (may be created later)
    AP4_CttsAtom* ctts = NULL;
    
    // start chunk table
    AP4_Ordinal             current_chunk_index              = 0;
    AP4_Size                current_chunk_size               = 0;
    AP4_Position            current_chunk_offset             = 0;
    AP4_Cardinal            current_samples_in_chunk         = 0;
    AP4_Ordinal             current_sample_description_index = 0;
    AP4_UI32                current_duration                 = 0;
    AP4_Cardinal            current_duration_run             = 0;
    AP4_UI32                current_cts_delta                = 0;
    AP4_Cardinal            current_cts_delta_run            = 0;
    AP4_Array<AP4_Position> chunk_offsets;

    // process all the samples
    bool         all_samples_are_sync = false;
    AP4_Cardinal sample_count = GetSampleCount();
    for (AP4_Ordinal i=0; i<sample_count; i++) {
        AP4_Sample sample;
        GetSample(i, sample);
        
        // update DTS table
        AP4_UI32 new_duration = sample.GetDuration();
        if (new_duration != current_duration && current_duration_run != 0) {
            // emit a new stts entry
            stts->AddEntry(current_duration_run, current_duration);
            
            // reset the run count
            current_duration_run = 0;
        } 
        ++current_duration_run;
        current_duration = new_duration;
        
        // update CTS table
        AP4_UI32 new_cts_delta = sample.GetCtsDelta();
        if (new_cts_delta != current_cts_delta && current_cts_delta_run != 0) {
            // create a ctts atom if we don't have one
            if (ctts == NULL) ctts = new AP4_CttsAtom();
            
            //emit a new ctts entry
            ctts->AddEntry(current_cts_delta_run, current_cts_delta);
            
            // reset the run count
            current_cts_delta_run = 0;
        }
        ++current_cts_delta_run;
        current_cts_delta = new_cts_delta;
        
        // add an entry into the stsz atom
        stsz->AddEntry(sample.GetSize());
        
        // update the sync sample table
        if (sample.IsSync()) {
            stss->AddEntry(i+1);
            if (i==0) all_samples_are_sync = true;
        } else {
            all_samples_are_sync = false;
        }
        
        // see in which chunk this sample is
        AP4_Ordinal chunk_index = 0;
        AP4_Ordinal position_in_chunk = 0;
        AP4_Result  result = GetSampleChunkPosition(i, chunk_index, position_in_chunk);
        if (AP4_SUCCEEDED(result)) {
            if (chunk_index != current_chunk_index && current_samples_in_chunk != 0) {
                // new chunk
                chunk_offsets.Append(current_chunk_offset);
                current_chunk_offset += current_chunk_size;

                stsc->AddEntry(1, 
                               current_samples_in_chunk,
                               current_sample_description_index+1);

                current_samples_in_chunk = 0;
                current_chunk_size       = 0;
//.........这里部分代码省略.........