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_content.h"
23 #include "sndfile_decoder.h"
25 #include "exceptions.h"
31 using std::stringstream;
34 using boost::shared_ptr;
35 using boost::optional;
39 SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<SndfileContent> c)
44 SNDFILE* sf = open_file (frames);
49 SndfileDecoder::open_file (sf_count_t & frames)
54 SNDFILE* s = sf_open (_sndfile_content->file().string().c_str(), SFM_READ, &info);
56 throw DecodeError (_("could not open external audio file for reading"));
64 SndfileDecoder::pass ()
67 SNDFILE* sndfile = open_file (frames);
69 /* Do things in half second blocks as I think there may be limits
70 to what FFmpeg (and in particular the resampler) can cope with.
72 sf_count_t const block = _sndfile_content->audio_frame_rate() / 2;
74 shared_ptr<AudioBuffers> audio (new AudioBuffers (_sndfile_content->audio_channels(), block));
76 sf_count_t const this_time = min (block, frames);
77 sf_read_float (sndfile, audio->data(0), this_time);
78 audio->set_frames (this_time);