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)
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()));
86 resampler->set_fast (_fast);
87 _resamplers[stream] = resampler;
92 shared_ptr<const AudioBuffers> ro = resampler->run (data);
93 if (ro->frames() == 0) {
99 Data(stream, ContentAudio (data, _positions[stream]));
100 _positions[stream] += data->frames();
103 /** @return Time just after the last thing that was emitted from a given stream */
105 AudioDecoder::stream_position (shared_ptr<const Film> film, AudioStreamPtr stream) const
107 PositionMap::const_iterator i = _positions.find (stream);
108 DCPOMATIC_ASSERT (i != _positions.end ());
109 return ContentTime::from_frames (i->second, _content->resampled_frame_rate(film));
113 AudioDecoder::position (shared_ptr<const Film> film) const
115 optional<ContentTime> p;
116 for (PositionMap::const_iterator i = _positions.begin(); i != _positions.end(); ++i) {
117 ContentTime const ct = stream_position (film, i->first);
123 return p.get_value_or(ContentTime());
127 AudioDecoder::seek ()
129 for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
134 for (PositionMap::iterator i = _positions.begin(); i != _positions.end(); ++i) {
140 AudioDecoder::flush ()
142 for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
143 shared_ptr<const AudioBuffers> ro = i->second->flush ();
144 if (ro->frames() > 0) {
145 Data (i->first, ContentAudio (ro, _positions[i->first]));
146 _positions[i->first] += ro->frames();
150 if (_content->delay() < 0) {
151 /* Finish off with the gap caused by the delay */
152 silence (-_content->delay ());
157 AudioDecoder::silence (int milliseconds)
159 BOOST_FOREACH (AudioStreamPtr i, _content->streams ()) {
160 int const samples = ContentTime::from_seconds(milliseconds / 1000.0).frames_round(i->frame_rate());
161 shared_ptr<AudioBuffers> silence (new AudioBuffers (i->channels(), samples));
162 silence->make_silent ();
163 Data (i, ContentAudio (silence, _positions[i]));
168 AudioDecoder::set_fast (bool fast)
171 for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
172 i->second->set_fast (_fast);