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(0).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 if (_remaining == 0) {
65 /* Do things in half second blocks as I think there may be limits
66 to what FFmpeg (and in particular the resampler) can cope with.
68 sf_count_t const block = _sndfile_content->content_audio_frame_rate() / 2;
69 sf_count_t const this_time = min (block, _remaining);
71 int const channels = _sndfile_content->audio_channels ();
73 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, this_time));
75 if (_sndfile_content->audio_channels() == 1) {
76 /* No de-interleaving required */
77 sf_read_float (_sndfile, data->data(0), this_time);
80 if (!_deinterleave_buffer) {
81 _deinterleave_buffer = new float[block * channels];
83 sf_readf_float (_sndfile, _deinterleave_buffer, this_time);
84 vector<float*> out_ptr (channels);
85 for (int i = 0; i < channels; ++i) {
86 out_ptr[i] = data->data(i);
88 float* in_ptr = _deinterleave_buffer;
89 for (int i = 0; i < this_time; ++i) {
90 for (int j = 0; j < channels; ++j) {
91 *out_ptr[j]++ = *in_ptr++;
96 data->set_frames (this_time);
97 audio (data, _done * TIME_HZ / audio_frame_rate ());
99 _remaining -= this_time;
101 return _remaining == 0;
105 SndfileDecoder::audio_channels () const
107 return _info.channels;
111 SndfileDecoder::audio_length () const
117 SndfileDecoder::audio_frame_rate () const
119 return _info.samplerate;
123 SndfileDecoder::seek (ContentTime t, bool accurate)
125 Decoder::seek (t, accurate);
126 AudioDecoder::seek (t, accurate);
128 _done = t * audio_frame_rate() / TIME_HZ;
129 _remaining = _info.frames - _done;