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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 <iostream>
#include <sndfile.h>
#include "sndfile_content.h"
#include "sndfile_decoder.h"
#include "film.h"
#include "exceptions.h"
#include "i18n.h"
using std::vector;
using std::string;
using std::min;
using std::cout;
using boost::shared_ptr;
SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
: Decoder (f)
, AudioDecoder (f)
, _sndfile_content (c)
{
_sndfile = sf_open (_sndfile_content->file().string().c_str(), SFM_READ, &_info);
if (!_sndfile) {
throw DecodeError (_("could not open audio file for reading"));
}
_done = 0;
_remaining = _info.frames;
}
SndfileDecoder::~SndfileDecoder ()
{
if (_sndfile) {
sf_close (_sndfile);
}
}
bool
SndfileDecoder::pass ()
{
/* Do things in half second blocks as I think there may be limits
to what FFmpeg (and in particular the resampler) can cope with.
*/
sf_count_t const block = _sndfile_content->audio_frame_rate() / 2;
sf_count_t const this_time = min (block, _remaining);
shared_ptr<AudioBuffers> audio (new AudioBuffers (_sndfile_content->audio_channels(), this_time));
sf_read_float (_sndfile, audio->data(0), this_time);
audio->set_frames (this_time);
Audio (audio, double(_done) / audio_frame_rate());
_done += this_time;
_remaining -= this_time;
return (_remaining == 0);
}
int
SndfileDecoder::audio_channels () const
{
return _info.channels;
}
ContentAudioFrame
SndfileDecoder::audio_length () const
{
return _info.frames;
}
int
SndfileDecoder::audio_frame_rate () const
{
return _info.samplerate;
}
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