-void
-Decoder::process_begin ()
-{
- _delay_in_frames = _film->audio_delay() * audio_sample_rate() / 1000;
- _delay_line = new DelayLine (audio_channels(), _delay_in_frames);
-}
-
-/** Finish off a decode processing run */
-void
-Decoder::process_end ()
-{
- 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> ());
- }
-
- /* Now recompute our check value */
- audio_short_by_frames = 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 few audio frames", audio_short_by_frames));
- shared_ptr<AudioBuffers> b (new AudioBuffers (audio_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_frames_out) / _film->dcp_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 (uint8_t* data, int size)
-{
- if (size == 0) {
- return;
- }
-
- assert (_film->audio_channels());
- assert (bytes_per_audio_sample());
-
- /* Deinterleave and convert to float */
-
- assert ((size % (bytes_per_audio_sample() * audio_channels())) == 0);
-
- int const total_samples = size / bytes_per_audio_sample();
- int const frames = total_samples / _film->audio_channels();
- shared_ptr<AudioBuffers> audio (new AudioBuffers (audio_channels(), frames));
-
- switch (audio_sample_format()) {
- case AV_SAMPLE_FMT_S16:
- {
- int16_t* p = (int16_t *) data;
- int sample = 0;
- int channel = 0;
- for (int i = 0; i < total_samples; ++i) {
- audio->data(channel)[sample] = float(*p++) / (1 << 15);
-
- ++channel;
- if (channel == _film->audio_channels()) {
- channel = 0;
- ++sample;
- }
- }
- }
- break;
-
- case AV_SAMPLE_FMT_S32:
- {
- int32_t* p = (int32_t *) data;
- int sample = 0;
- int channel = 0;
- for (int i = 0; i < total_samples; ++i) {
- audio->data(channel)[sample] = float(*p++) / (1 << 31);
-
- ++channel;
- if (channel == _film->audio_channels()) {
- channel = 0;
- ++sample;
- }
- }
- }
-
- case AV_SAMPLE_FMT_FLTP:
- {
- float* p = reinterpret_cast<float*> (data);
- for (int i = 0; i < _film->audio_channels(); ++i) {
- memcpy (audio->data(i), p, frames * sizeof(float));
- p += frames;
- }
- }
- break;
-
- default:
- assert (false);
- }
-
- /* Maybe apply gain */
- if (_film->audio_gain() != 0) {
- float const linear_gain = pow (10, _film->audio_gain() / 20);
- for (int i = 0; i < _film->audio_channels(); ++i) {
- for (int j = 0; j < frames; ++j) {
- audio->data(i)[j] *= linear_gain;
- }
- }
- }
-
- _delay_line->feed (audio);
-
- /* Decode range in audio frames */
- pair<int64_t, int64_t> required_range (
- video_frames_to_audio_frames (_film->dcp_trim_start()),
- video_frames_to_audio_frames (_film->dcp_trim_start() + _film->dcp_length().get())
- );
-
- /* Range of this block of data */
- pair<int64_t, int64_t> this_range (
- _audio_frames_in,
- _audio_frames_in + audio->frames()
- );
-
- /* Trim start */
- if (required_range.first >= this_range.first && required_range.first < this_range.second) {
- int64_t const shift = this_range.first - required_range.first;
- audio->move (shift, 0, audio->frames() - shift);
- audio->set_frames (audio->frames() - shift);
- }
-
- /* Trim end */
- if (required_range.second >= this_range.first && required_range.second < this_range.second) {
- audio->set_frames (this_range.first - required_range.second);
- }
-
- if (audio->frames()) {
- emit_audio (audio);
- }
-}
-
-void
-Decoder::emit_audio (shared_ptr<AudioBuffers> audio)