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.
22 #include "sndfile_decoder.h"
24 #include "exceptions.h"
30 using std::stringstream;
33 using boost::shared_ptr;
34 using boost::optional;
36 SndfileDecoder::SndfileDecoder (shared_ptr<Film> f, DecodeOptions o)
41 vector<SNDFILE*> sf = open_files (frames);
46 SndfileDecoder::open_files (sf_count_t & frames)
48 vector<string> const files = _film->external_audio ();
51 for (size_t i = 0; i < files.size(); ++i) {
52 if (!files[i].empty()) {
58 return vector<SNDFILE*> ();
64 vector<SNDFILE*> sndfiles;
65 for (size_t i = 0; i < (size_t) N; ++i) {
66 if (files[i].empty ()) {
67 sndfiles.push_back (0);
70 SNDFILE* s = sf_open (files[i].c_str(), SFM_READ, &info);
72 throw DecodeError (_("could not open external audio file for reading"));
75 if (info.channels != 1) {
76 throw DecodeError (_("external audio files must be mono"));
79 sndfiles.push_back (s);
82 shared_ptr<SndfileStream> st (
84 info.samplerate, av_get_default_channel_layout (N)
88 _audio_streams.push_back (st);
93 if (info.frames != frames) {
94 throw DecodeError (_("external audio files have differing lengths"));
104 SndfileDecoder::pass ()
107 vector<SNDFILE*> sndfiles = open_files (frames);
108 if (sndfiles.empty()) {
112 /* Do things in half second blocks as I think there may be limits
113 to what FFmpeg (and in particular the resampler) can cope with.
115 sf_count_t const block = _audio_stream->sample_rate() / 2;
117 shared_ptr<AudioBuffers> audio (new AudioBuffers (_audio_stream->channels(), block));
119 sf_count_t const this_time = min (block, frames);
120 for (size_t i = 0; i < sndfiles.size(); ++i) {
122 audio->make_silent (i);
124 sf_read_float (sndfiles[i], audio->data(i), block);
128 audio->set_frames (this_time);
133 close_files (sndfiles);
139 SndfileDecoder::close_files (vector<SNDFILE*> const & sndfiles)
141 for (size_t i = 0; i < sndfiles.size(); ++i) {
142 sf_close (sndfiles[i]);
146 shared_ptr<SndfileStream>
147 SndfileStream::create ()
149 return shared_ptr<SndfileStream> (new SndfileStream);
152 shared_ptr<SndfileStream>
153 SndfileStream::create (string t, optional<int> v)
156 /* version < 1; no type in the string, and there's only FFmpeg streams anyway */
157 return shared_ptr<SndfileStream> ();
163 if (type != N_("external")) {
164 return shared_ptr<SndfileStream> ();
167 return shared_ptr<SndfileStream> (new SndfileStream (t, v));
170 SndfileStream::SndfileStream (string t, optional<int> v)
176 s >> type >> _sample_rate >> _channel_layout;
179 SndfileStream::SndfileStream ()
185 SndfileStream::to_string () const
187 return String::compose (N_("external %1 %2"), _sample_rate, _channel_layout);