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"
26 #include "audio_buffers.h"
34 using boost::shared_ptr;
36 SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
39 , _sndfile_content (c)
40 , _deinterleave_buffer (0)
43 _sndfile = sf_open (_sndfile_content->path().string().c_str(), SFM_READ, &_info);
45 throw DecodeError (_("could not open audio file for reading"));
49 _remaining = _info.frames;
52 SndfileDecoder::~SndfileDecoder ()
55 delete[] _deinterleave_buffer;
59 SndfileDecoder::pass ()
61 /* Do things in half second blocks as I think there may be limits
62 to what FFmpeg (and in particular the resampler) can cope with.
64 sf_count_t const block = _sndfile_content->content_audio_frame_rate() / 2;
65 sf_count_t const this_time = min (block, _remaining);
67 int const channels = _sndfile_content->audio_channels ();
69 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, this_time));
71 if (_sndfile_content->audio_channels() == 1) {
72 /* No de-interleaving required */
73 sf_read_float (_sndfile, data->data(0), this_time);
76 if (!_deinterleave_buffer) {
77 _deinterleave_buffer = new float[block * channels];
79 sf_readf_float (_sndfile, _deinterleave_buffer, this_time);
80 vector<float*> out_ptr (channels);
81 for (int i = 0; i < channels; ++i) {
82 out_ptr[i] = data->data(i);
84 float* in_ptr = _deinterleave_buffer;
85 for (int i = 0; i < this_time; ++i) {
86 for (int j = 0; j < channels; ++j) {
87 *out_ptr[j]++ = *in_ptr++;
92 data->set_frames (this_time);
95 _remaining -= this_time;
99 SndfileDecoder::audio_channels () const
101 return _info.channels;
105 SndfileDecoder::audio_length () const
111 SndfileDecoder::audio_frame_rate () const
113 return _info.samplerate;
117 SndfileDecoder::done () const
119 return _audio_position >= _sndfile_content->audio_length ();