- if (_delay_in_frames < 0 && _opt->decode_audio && audio_channels()) {
- shared_ptr<AudioBuffers> b (new AudioBuffers (audio_channels(), -_delay_in_frames));
- b->make_silent ();
- emit_audio (b);
- }
-
- if (_opt->decode_audio && audio_channels()) {
-
- /* Ensure that our video and audio emissions are the same length */
-
- int64_t audio_short_by_frames = video_frames_to_audio_frames (_video_frames_out) - _audio_frames_out;
-
- _film->log()->log (
- String::compose ("Decoder has emitted %1 video frames (which equals %2 audio frames) and %3 audio frames",
- _video_frames_out,
- video_frames_to_audio_frames (_video_frames_out),
- _audio_frames_out)
- );
-
- if (audio_short_by_frames < 0) {
-
- _film->log()->log (String::compose ("Emitted %1 too many audio frames", -audio_short_by_frames));
-
- /* We have emitted more audio than video. Emit enough black video frames so that we reverse this */
- int const black_video_frames = ceil (-audio_short_by_frames * frames_per_second() / audio_sample_rate());
-
- _film->log()->log (String::compose ("Emitting %1 frames of black video", black_video_frames));
-
- shared_ptr<Image> black (new CompactImage (pixel_format(), native_size()));
- black->make_black ();
- for (int i = 0; i < black_video_frames; ++i) {
- emit_video (black, shared_ptr<Subtitle> ());
- }