2 Copyright (C) 2012-2017 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"
25 #include "resampler.h"
26 #include "compose.hpp"
27 #include <boost/foreach.hpp>
32 #define LOG_GENERAL(...) _log->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
37 using boost::shared_ptr;
38 using boost::optional;
40 AudioDecoder::AudioDecoder (Decoder* parent, shared_ptr<const AudioContent> content, shared_ptr<Log> log)
41 : DecoderPart (parent, log)
44 /* Set up _positions so that we have one for each stream */
45 BOOST_FOREACH (AudioStreamPtr i, content->streams ()) {
51 AudioDecoder::emit (AudioStreamPtr stream, shared_ptr<const AudioBuffers> data, ContentTime time)
57 if (_positions[stream] == 0) {
58 /* This is the first data we have received since initialisation or seek. Set
59 the position based on the ContentTime that was given. After this first time
60 we just count samples, as it seems that ContentTimes are unreliable from
61 FFmpegDecoder (not quite continuous; perhaps due to some rounding error).
63 if (_content->delay() > 0) {
64 /* Insert silence to give the delay */
65 silence (_content->delay ());
67 time += ContentTime::from_seconds (_content->delay() / 1000.0);
68 _positions[stream] = time.frames_round (stream->frame_rate ());
71 shared_ptr<Resampler> resampler;
72 map<AudioStreamPtr, shared_ptr<Resampler> >::iterator i = _resamplers.find(stream);
73 if (i != _resamplers.end ()) {
74 resampler = i->second;
76 if (stream->frame_rate() != _content->resampled_frame_rate()) {
78 "Creating new resampler from %1 to %2 with %3 channels",
80 _content->resampled_frame_rate(),
84 resampler.reset (new Resampler (stream->frame_rate(), _content->resampled_frame_rate(), stream->channels()));
85 _resamplers[stream] = resampler;
90 shared_ptr<const AudioBuffers> ro = resampler->run (data);
91 if (ro->frames() == 0) {
97 _positions[stream] += Data(stream, ContentAudio (data, _positions[stream])).get_value_or(0);
100 /** @return Time just after the last thing that was emitted from a given stream */
102 AudioDecoder::stream_position (AudioStreamPtr stream) const
104 map<AudioStreamPtr, Frame>::const_iterator i = _positions.find (stream);
105 DCPOMATIC_ASSERT (i != _positions.end ());
106 return ContentTime::from_frames (i->second, _content->resampled_frame_rate());
110 AudioDecoder::position () const
112 optional<ContentTime> p;
113 for (map<AudioStreamPtr, Frame>::const_iterator i = _positions.begin(); i != _positions.end(); ++i) {
114 ContentTime const ct = stream_position (i->first);
120 return p.get_value_or(ContentTime());
124 AudioDecoder::seek ()
126 for (map<AudioStreamPtr, shared_ptr<Resampler> >::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
131 for (map<AudioStreamPtr, Frame>::iterator i = _positions.begin(); i != _positions.end(); ++i) {
137 AudioDecoder::flush ()
139 for (map<AudioStreamPtr, shared_ptr<Resampler> >::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
140 shared_ptr<const AudioBuffers> ro = i->second->flush ();
141 if (ro->frames() > 0) {
142 Data (i->first, ContentAudio (ro, _positions[i->first]));
143 _positions[i->first] += ro->frames();
147 if (_content->delay() < 0) {
148 /* Finish off with the gap caused by the delay */
149 silence (-_content->delay ());
154 AudioDecoder::silence (int milliseconds)
156 BOOST_FOREACH (AudioStreamPtr i, _content->streams ()) {
157 int const samples = ContentTime::from_seconds(milliseconds / 1000.0).frames_round(i->frame_rate());
158 shared_ptr<AudioBuffers> silence (new AudioBuffers (i->channels(), samples));
159 silence->make_silent ();
160 Data (i, ContentAudio (silence, _positions[i]));