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 Data (stream, ContentAudio (data, _positions[stream]));
98 _positions[stream] += data->frames();
101 /** @return Time just after the last thing that was emitted from a given stream */
103 AudioDecoder::stream_position (AudioStreamPtr stream) const
105 map<AudioStreamPtr, Frame>::const_iterator i = _positions.find (stream);
106 DCPOMATIC_ASSERT (i != _positions.end ());
107 return ContentTime::from_frames (i->second, _content->resampled_frame_rate());
111 AudioDecoder::position () const
113 optional<ContentTime> p;
114 for (map<AudioStreamPtr, Frame>::const_iterator i = _positions.begin(); i != _positions.end(); ++i) {
115 ContentTime const ct = stream_position (i->first);
121 return p.get_value_or(ContentTime());
125 AudioDecoder::seek ()
127 for (map<AudioStreamPtr, shared_ptr<Resampler> >::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
132 for (map<AudioStreamPtr, Frame>::iterator i = _positions.begin(); i != _positions.end(); ++i) {
138 AudioDecoder::flush ()
140 for (map<AudioStreamPtr, shared_ptr<Resampler> >::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
141 shared_ptr<const AudioBuffers> ro = i->second->flush ();
142 if (ro->frames() > 0) {
143 Data (i->first, ContentAudio (ro, _positions[i->first]));
144 _positions[i->first] += ro->frames();
148 if (_content->delay() < 0) {
149 /* Finish off with the gap caused by the delay */
150 silence (-_content->delay ());
155 AudioDecoder::silence (int milliseconds)
157 BOOST_FOREACH (AudioStreamPtr i, _content->streams ()) {
158 int const samples = ContentTime::from_seconds(milliseconds / 1000.0).frames_round(i->frame_rate());
159 shared_ptr<AudioBuffers> silence (new AudioBuffers (i->channels(), samples));
160 silence->make_silent ();
161 Data (i, ContentAudio (silence, _positions[i]));