2 Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "audio_decoder.h"
22 #include "audio_buffers.h"
23 #include "audio_content.h"
24 #include "dcpomatic_log.h"
26 #include "resampler.h"
27 #include "compose.hpp"
28 #include <boost/foreach.hpp>
36 using boost::shared_ptr;
37 using boost::optional;
38 using namespace dcpomatic;
40 AudioDecoder::AudioDecoder (Decoder* parent, shared_ptr<const AudioContent> content, bool fast)
41 : DecoderPart (parent)
45 /* Set up _positions so that we have one for each stream */
46 BOOST_FOREACH (AudioStreamPtr i, content->streams ()) {
52 AudioDecoder::emit (shared_ptr<const Film> film, AudioStreamPtr stream, shared_ptr<const AudioBuffers> data, ContentTime time)
58 if (_positions[stream] == 0) {
59 /* This is the first data we have received since initialisation or seek. Set
60 the position based on the ContentTime that was given. After this first time
61 we just count samples, as it seems that ContentTimes are unreliable from
62 FFmpegDecoder (not quite continuous; perhaps due to some rounding error).
64 if (_content->delay() > 0) {
65 /* Insert silence to give the delay */
66 silence (_content->delay ());
68 time += ContentTime::from_seconds (_content->delay() / 1000.0);
69 _positions[stream] = time.frames_round (_content->resampled_frame_rate(film));
72 shared_ptr<Resampler> resampler;
73 ResamplerMap::iterator i = _resamplers.find(stream);
74 if (i != _resamplers.end ()) {
75 resampler = i->second;
77 if (stream->frame_rate() != _content->resampled_frame_rate(film)) {
79 "Creating new resampler from %1 to %2 with %3 channels",
81 _content->resampled_frame_rate(film),
85 resampler.reset (new Resampler (stream->frame_rate(), _content->resampled_frame_rate(film), stream->channels()));
87 resampler->set_fast ();
89 _resamplers[stream] = resampler;
94 shared_ptr<const AudioBuffers> ro = resampler->run (data);
95 if (ro->frames() == 0) {
101 Data(stream, ContentAudio (data, _positions[stream]));
102 _positions[stream] += data->frames();
105 /** @return Time just after the last thing that was emitted from a given stream */
107 AudioDecoder::stream_position (shared_ptr<const Film> film, AudioStreamPtr stream) const
109 PositionMap::const_iterator i = _positions.find (stream);
110 DCPOMATIC_ASSERT (i != _positions.end ());
111 return ContentTime::from_frames (i->second, _content->resampled_frame_rate(film));
114 boost::optional<ContentTime>
115 AudioDecoder::position (shared_ptr<const Film> film) const
117 optional<ContentTime> p;
118 for (PositionMap::const_iterator i = _positions.begin(); i != _positions.end(); ++i) {
119 ContentTime const ct = stream_position (film, i->first);
129 AudioDecoder::seek ()
131 for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
136 for (PositionMap::iterator i = _positions.begin(); i != _positions.end(); ++i) {
142 AudioDecoder::flush ()
144 for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
145 shared_ptr<const AudioBuffers> ro = i->second->flush ();
146 if (ro->frames() > 0) {
147 Data (i->first, ContentAudio (ro, _positions[i->first]));
148 _positions[i->first] += ro->frames();
152 if (_content->delay() < 0) {
153 /* Finish off with the gap caused by the delay */
154 silence (-_content->delay ());
159 AudioDecoder::silence (int milliseconds)
161 BOOST_FOREACH (AudioStreamPtr i, _content->streams ()) {
162 int const samples = ContentTime::from_seconds(milliseconds / 1000.0).frames_round(i->frame_rate());
163 shared_ptr<AudioBuffers> silence (new AudioBuffers (i->channels(), samples));
164 silence->make_silent ();
165 Data (i, ContentAudio (silence, _positions[i]));