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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sndfile.h>
#include "external_audio_decoder.h"
#include "film.h"
#include "exceptions.h"
using std::vector;
using std::string;
using std::min;
using std::cout;
using boost::shared_ptr;
ExternalAudioDecoder::ExternalAudioDecoder (shared_ptr<Film> f, shared_ptr<const Options> o, Job* j)
: Decoder (f, o, j)
, AudioDecoder (f, o, j)
{
}
bool
ExternalAudioDecoder::pass ()
{
vector<string> const files = _film->external_audio ();
int N = 0;
for (size_t i = 0; i < files.size(); ++i) {
if (!files[i].empty()) {
N = i + 1;
}
}
if (N == 0) {
return true;
}
bool first = true;
sf_count_t frames = 0;
vector<SNDFILE*> sndfiles;
for (size_t i = 0; i < (size_t) N; ++i) {
if (files[i].empty ()) {
sndfiles.push_back (0);
} else {
SF_INFO info;
SNDFILE* s = sf_open (files[i].c_str(), SFM_READ, &info);
if (!s) {
throw DecodeError ("could not open external audio file for reading");
}
if (info.channels != 1) {
throw DecodeError ("external audio files must be mono");
}
sndfiles.push_back (s);
if (first) {
/* XXX: nasty magic value */
AudioStream st ("DVDOMATIC-EXTERNAL", -1, info.samplerate, av_get_default_channel_layout (N));
_audio_streams.push_back (st);
_audio_stream = st;
frames = info.frames;
first = false;
} else {
if (info.frames != frames) {
throw DecodeError ("external audio files have differing lengths");
}
}
}
}
sf_count_t const block = 65536;
shared_ptr<AudioBuffers> audio (new AudioBuffers (_audio_stream.get().channels(), block));
while (frames > 0) {
sf_count_t const this_time = min (block, frames);
for (size_t i = 0; i < sndfiles.size(); ++i) {
if (!sndfiles[i]) {
audio->make_silent (i);
} else {
sf_read_float (sndfiles[i], audio->data(i), block);
}
}
Audio (audio);
frames -= this_time;
}
for (size_t i = 0; i < sndfiles.size(); ++i) {
sf_close (sndfiles[i]);
}
return true;
}
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