2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "audio_decoder.h"
21 #include "audio_buffers.h"
22 #include "exceptions.h"
27 using std::stringstream;
30 using boost::optional;
31 using boost::shared_ptr;
33 AudioDecoder::AudioDecoder (shared_ptr<const Film> f, shared_ptr<const AudioContent> c)
38 if (_audio_content->content_audio_frame_rate() != _audio_content->output_audio_frame_rate()) {
40 shared_ptr<const Film> film = _film.lock ();
44 s << String::compose (
45 "Will resample audio from %1 to %2",
46 _audio_content->content_audio_frame_rate(), _audio_content->output_audio_frame_rate()
49 film->log()->log (s.str ());
51 /* We will be using planar float data when we call the
52 resampler. As far as I can see, the audio channel
53 layout is not necessary for our purposes; it seems
54 only to be used get the number of channels and
55 decide if rematrixing is needed. It won't be, since
56 input and output layouts are the same.
59 _swr_context = swr_alloc_set_opts (
61 av_get_default_channel_layout (MAX_AUDIO_CHANNELS),
63 _audio_content->output_audio_frame_rate(),
64 av_get_default_channel_layout (MAX_AUDIO_CHANNELS),
66 _audio_content->content_audio_frame_rate(),
70 swr_init (_swr_context);
76 AudioDecoder::~AudioDecoder ()
79 swr_free (&_swr_context);
86 AudioDecoder::process_end ()
90 shared_ptr<const Film> film = _film.lock ();
93 shared_ptr<AudioBuffers> out (new AudioBuffers (film->audio_mapping().dcp_channels(), 256));
96 int const frames = swr_convert (_swr_context, (uint8_t **) out->data(), 256, 0, 0);
99 throw EncodeError (_("could not run sample-rate converter"));
106 out->set_frames (frames);
107 _writer->write (out);
115 AudioDecoder::audio (shared_ptr<const AudioBuffers> data, Time time)
120 /* Compute the resampled frames count and add 32 for luck */
121 int const max_resampled_frames = ceil (
122 (int64_t) data->frames() * _audio_content->output_audio_frame_rate() / _audio_content->content_audio_frame_rate()
125 shared_ptr<AudioBuffers> resampled (new AudioBuffers (data->channels(), max_resampled_frames));
128 int const resampled_frames = swr_convert (
129 _swr_context, (uint8_t **) resampled->data(), max_resampled_frames, (uint8_t const **) data->data(), data->frames()
132 if (resampled_frames < 0) {
133 throw EncodeError (_("could not run sample-rate converter"));
136 resampled->set_frames (resampled_frames);
138 /* And point our variables at the resampled audio */
142 shared_ptr<const Film> film = _film.lock ();
146 shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (film->dcp_audio_channels(), data->frames()));
147 dcp_mapped->make_silent ();
148 list<pair<int, libdcp::Channel> > map = _audio_content->audio_mapping().content_to_dcp ();
149 for (list<pair<int, libdcp::Channel> >::iterator i = map.begin(); i != map.end(); ++i) {
150 dcp_mapped->accumulate_channel (data.get(), i->first, i->second);
153 Audio (dcp_mapped, time);
154 _next_audio = time + film->audio_frames_to_time (data->frames());