- , _opt (o)
- , _job (j)
- , _video_frame (0)
- , _audio_frame (0)
- , _delay_line (0)
- , _delay_in_frames (0)
-{
-
-}
-
-Decoder::~Decoder ()
-{
- delete _delay_line;
-}
-
-/** Start off a decode processing run. This should only be called once on
- * a given Decoder object.
- */
-void
-Decoder::process_begin ()
-{
- if (_audio_stream) {
- _delay_in_frames = _film->audio_delay() * _audio_stream.get().sample_rate() / 1000;
- _delay_line = new DelayLine (_audio_stream.get().channels(), _delay_in_frames);
- }
-}
-
-/** Finish off a decode processing run */
-void
-Decoder::process_end ()
-{
- if (_delay_in_frames < 0 && _opt->decode_audio && _audio_stream) {
- shared_ptr<AudioBuffers> b (new AudioBuffers (_audio_stream.get().channels(), -_delay_in_frames));
- b->make_silent ();
- emit_audio (b);
- }
-
- if (_opt->decode_audio && _audio_stream) {
-
- /* Ensure that our video and audio emissions are the same length */
-
- int64_t audio_short_by_frames = video_frames_to_audio_frames (_video_frame, _audio_stream.get().sample_rate(), frames_per_second()) - _audio_frame;
-
- _film->log()->log (
- String::compose (
- "Decoder has emitted %1 video frames (which equals %2 audio frames) and %3 audio frames",
- _video_frame,
- video_frames_to_audio_frames (_video_frame, _audio_stream.get().sample_rate(), frames_per_second()),
- _audio_frame
- )
- );
-
- 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_stream.get().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> ());
- }
-
- /* Now recompute our check value */
- audio_short_by_frames = video_frames_to_audio_frames (_video_frame, _audio_stream.get().sample_rate(), frames_per_second()) - _audio_frame;
- }
-
- if (audio_short_by_frames > 0) {
- _film->log()->log (String::compose ("Emitted %1 too few audio frames", audio_short_by_frames));
- shared_ptr<AudioBuffers> b (new AudioBuffers (_audio_stream.get().channels(), audio_short_by_frames));
- b->make_silent ();
- emit_audio (b);
- }
- }
-}
-
-/** Start decoding */
-void
-Decoder::go ()
-{
- process_begin ();
-
- if (_job && !_film->dcp_length()) {
- _job->set_progress_unknown ();
- }
-
- while (pass () == false) {
- if (_job && _film->dcp_length()) {
- _job->set_progress (float (_video_frame) / _film->length().get());
- }
- }
-
- process_end ();
-}
-
-/** Called by subclasses to tell the world that some audio data is ready
- * @param data Audio data, in Film::audio_sample_format.
- * @param size Number of bytes of data.
- */
-void
-Decoder::process_audio (shared_ptr<AudioBuffers> audio)