- , _opt (o)
- , _job (j)
- , _minimal (minimal)
- , _video_frames_in (0)
- , _video_frames_out (0)
- , _audio_frames_in (0)
- , _audio_frames_out (0)
- , _delay_line (0)
- , _delay_in_bytes (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 ()
-{
- _delay_in_bytes = _film->audio_delay() * audio_sample_rate() * audio_channels() * bytes_per_audio_sample() / 1000;
- _delay_line = new DelayLine (_delay_in_bytes);
-}
-
-/** Finish off a decode processing run */
-void
-Decoder::process_end ()
-{
- if (_delay_in_bytes < 0) {
- /* Empty the delay line */
- uint8_t remainder[-_delay_in_bytes];
- _delay_line->get_remaining (remainder);
- emit_audio (remainder, -_delay_in_bytes);
- }
-
- if (_opt->decode_audio) {
-
- /* Ensure that our video and audio emissions are the same length */
-
- int64_t video_frames_out_in_audio_frames = ((int64_t) _video_frames_out * audio_sample_rate() / frames_per_second());
- int64_t audio_short_by_frames = video_frames_out_in_audio_frames - _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_out_in_audio_frames,
- _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 values */
- video_frames_out_in_audio_frames = ((int64_t) _video_frames_out * audio_sample_rate() / frames_per_second());
- audio_short_by_frames = video_frames_out_in_audio_frames - _audio_frames_out;
- }
-
- if (audio_short_by_frames > 0) {
-
- _film->log()->log (String::compose ("Emitted %1 too few audio frames", audio_short_by_frames));
-
- /* XXX: this is slightly questionable; does memset () give silence with all
- sample formats?
- */
-
- int64_t bytes = audio_short_by_frames * _film->audio_channels() * bytes_per_audio_sample();
-
- int64_t const silence_size = 16 * 1024 * _film->audio_channels() * bytes_per_audio_sample();
- uint8_t silence[silence_size];
- memset (silence, 0, silence_size);
-
- while (bytes) {
- int64_t const t = min (bytes, silence_size);
- emit_audio (silence, t);
- bytes -= t;
- }
- }
- }
-}
-
-/** 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)
-{
- /* Push into the delay line */
- size = _delay_line->feed (data, size);
-
- emit_audio (data, size);
-}
-
-void
-Decoder::emit_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;
- }
- }
- }
-
- /* Update the number of audio frames we've pushed to the encoder */
- _audio_frames_out += audio->frames ();
-
- Audio (audio);
-}
-
-/** Called by subclasses to tell the world that some video data is ready.
- * We do some post-processing / filtering then emit it for listeners.
- * @param frame to decode; caller manages memory.
- */
-void
-Decoder::process_video (AVFrame* frame)