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"
33 using boost::shared_ptr;
35 SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
38 , _sndfile_content (c)
40 _sndfile = sf_open (_sndfile_content->file().string().c_str(), SFM_READ, &_info);
42 throw DecodeError (_("could not open audio file for reading"));
45 _remaining = _info.frames;
48 SndfileDecoder::~SndfileDecoder ()
56 SndfileDecoder::pass ()
58 /* Do things in half second blocks as I think there may be limits
59 to what FFmpeg (and in particular the resampler) can cope with.
61 sf_count_t const block = _sndfile_content->audio_frame_rate() / 2;
62 sf_count_t const this_time = min (block, _remaining);
64 shared_ptr<AudioBuffers> audio (new AudioBuffers (_sndfile_content->audio_channels(), this_time));
65 sf_read_float (_sndfile, audio->data(0), this_time);
66 audio->set_frames (this_time);
68 _remaining -= this_time;
70 return (_remaining == 0);
74 SndfileDecoder::audio_channels () const
76 return _info.channels;
80 SndfileDecoder::audio_length () const
86 SndfileDecoder::audio_frame_rate () const
88 return _info.samplerate;