X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fdecoder.cc;h=fd0abee4183e540b4a4db5c5a9cb3588e5d8a34c;hb=32fc1ddb0ee004d18c36155ddcf4d9b3998a7061;hp=e154aac5d10b3f3fd2d3b878798eb776a7337afc;hpb=09a95eca971ddd2ea75cd615e7ef2b997d52b690;p=dcpomatic.git diff --git a/src/lib/decoder.cc b/src/lib/decoder.cc index e154aac5d..fd0abee41 100644 --- a/src/lib/decoder.cc +++ b/src/lib/decoder.cc @@ -40,305 +40,37 @@ using std::string; using std::stringstream; using std::min; +using std::pair; using std::list; using boost::shared_ptr; +using boost::optional; /** @param f Film. - * @param o Options. + * @param o Decode options. * @param j Job that we are running within, or 0 - * @param minimal true to do the bare minimum of work; just run through the content. Useful for acquiring - * accurate frame counts as quickly as possible. This generates no video or audio output. - * @param ignore_length Ignore the content's claimed length when computing progress. */ -Decoder::Decoder (boost::shared_ptr f, boost::shared_ptr o, Job* j, bool minimal, bool ignore_length) +Decoder::Decoder (boost::shared_ptr f, DecodeOptions o, Job* j) : _film (f) , _opt (o) , _job (j) - , _minimal (minimal) - , _ignore_length (ignore_length) - , _video_frame_index (0) - , _delay_line (0) - , _delay_in_bytes (0) - , _audio_frames_processed (0) { - if (_opt->decode_video_frequency != 0 && !_film->length()) { - throw DecodeError ("cannot do a partial decode if length is unknown"); - } + _film_connection = f->Changed.connect (bind (&Decoder::film_changed, this, _1)); } -Decoder::~Decoder () -{ - delete _delay_line; -} - -/** Start off a decode processing run */ -void -Decoder::process_begin () -{ - _delay_in_bytes = _film->audio_delay() * audio_sample_rate() * audio_channels() * bytes_per_audio_sample() / 1000; - delete _delay_line; - _delay_line = new DelayLine (_delay_in_bytes); - - _audio_frames_processed = 0; -} - -/** Finish off a decode processing run */ -void -Decoder::process_end () -{ - if (_delay_in_bytes < 0) { - uint8_t remainder[-_delay_in_bytes]; - _delay_line->get_remaining (remainder); - _audio_frames_processed += _delay_in_bytes / (audio_channels() * bytes_per_audio_sample()); - emit_audio (remainder, -_delay_in_bytes); - } - - /* If we cut the decode off, the audio may be short; push some silence - in to get it to the right length. - */ - - int64_t const video_length_in_audio_frames = ((int64_t) video_frame_index() * audio_sample_rate() / frames_per_second()); - int64_t const audio_short_by_frames = video_length_in_audio_frames - _audio_frames_processed; - - _film->log()->log ( - String::compose ("DCP length is %1 (%2 audio frames); %3 frames of audio processed.", - video_frame_index(), - video_length_in_audio_frames, - _audio_frames_processed) - ); - - if (audio_short_by_frames >= 0 && _opt->decode_audio) { - - _film->log()->log (String::compose ("DCP length is %1; %2 frames of audio processed.", video_frame_index(), _audio_frames_processed)); - _film->log()->log (String::compose ("Adding %1 frames of silence to the end.", 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_frame_index) / _film->dcp_length().get()); - } - } - - process_end (); -} - -/** Run one pass. This may or may not generate any actual video / audio data; - * some decoders may require several passes to generate a single frame. - * @return true if we have finished processing all data; otherwise false. +/** Seek to a position as a source timestamp in seconds. + * @return true on error. */ bool -Decoder::pass () +Decoder::seek (double) { - if (!_ignore_length && _video_frame_index >= _film->dcp_length()) { - return true; - } - - return do_pass (); + throw DecodeError ("decoder does not support seek"); } -/** 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. +/** Seek so that the next frame we will produce is the same as the last one. + * @return true on error. */ -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 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 (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_processed += 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) -{ - if (_minimal) { - ++_video_frame_index; - return; - } - - /* Use Film::length here as our one may be wrong */ - - int gap = 0; - if (_opt->decode_video_frequency != 0) { - gap = _film->length().get() / _opt->decode_video_frequency; - } - - if (_opt->decode_video_frequency != 0 && gap != 0 && (_video_frame_index % gap) != 0) { - ++_video_frame_index; - return; - } - - shared_ptr graph; - - list >::iterator i = _filter_graphs.begin(); - while (i != _filter_graphs.end() && !(*i)->can_process (Size (frame->width, frame->height), (AVPixelFormat) frame->format)) { - ++i; - } - - if (i == _filter_graphs.end ()) { - graph.reset (new FilterGraph (_film, this, _opt->apply_crop, Size (frame->width, frame->height), (AVPixelFormat) frame->format)); - _filter_graphs.push_back (graph); - _film->log()->log (String::compose ("New graph for %1x%2, pixel format %3", frame->width, frame->height, frame->format)); - } else { - graph = *i; - } - - list > images = graph->process (frame); - - for (list >::iterator i = images.begin(); i != images.end(); ++i) { - if (_opt->black_after > 0 && _video_frame_index > _opt->black_after) { - (*i)->make_black (); - } - - shared_ptr sub; - if (_timed_subtitle && _timed_subtitle->displayed_at (double (video_frame_index()) / _film->frames_per_second())) { - sub = _timed_subtitle->subtitle (); - } - - TIMING ("Decoder emits %1", _video_frame_index); - Video (*i, _video_frame_index, sub); - ++_video_frame_index; - _last_image = *i; - _last_subtitle = sub; - } -} - -void -Decoder::repeat_last_video () -{ - assert (_last_image); - Video (_last_image, _video_frame_index, _last_subtitle); - ++_video_frame_index; -} - -void -Decoder::process_subtitle (shared_ptr s) -{ - _timed_subtitle = s; - - if (_timed_subtitle && _opt->apply_crop) { - Position const p = _timed_subtitle->subtitle()->position (); - _timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top)); - } -} - - -int -Decoder::bytes_per_audio_sample () const +bool +Decoder::seek_to_last () { - return av_get_bytes_per_sample (audio_sample_format ()); + throw DecodeError ("decoder does not support seek"); }