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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 "audio_decoder.h"
#include "audio_buffers.h"
#include "exceptions.h"
#include "log.h"
#include "resampler.h"
#include "util.h"
#include "film.h"
#include "i18n.h"
using std::stringstream;
using std::list;
using std::pair;
using std::cout;
using boost::optional;
using boost::shared_ptr;
AudioDecoder::AudioDecoder (shared_ptr<const Film> film, shared_ptr<const AudioContent> content)
: Decoder (film)
, _audio_content (content)
{
if (content->output_audio_frame_rate() != content->content_audio_frame_rate() && content->audio_channels ()) {
_resampler.reset (new Resampler (content->content_audio_frame_rate(), content->output_audio_frame_rate(), content->audio_channels ()));
}
}
/** Audio timestamping is made hard by many factors, but the final nail in the coffin is resampling.
* We have to assume that we are feeding continuous data into the resampler, and so we get continuous
* data out. Hence we do the timestamping here, post-resampler, just by counting samples.
*
* The time is passed in here so that after a seek we can set up our _audio_position. The
* time is ignored once this has been done.
*/
void
AudioDecoder::audio (shared_ptr<const AudioBuffers> data, ContentTime time)
{
if (_resampler) {
data = _resampler->run (data);
}
if (!_audio_position) {
shared_ptr<const Film> film = _film.lock ();
assert (film);
FrameRateChange frc = film->active_frame_rate_change (_audio_content->position ());
_audio_position = (double (time) / frc.speed_up) * film->audio_frame_rate() / TIME_HZ;
}
_pending.push_back (shared_ptr<DecodedAudio> (new DecodedAudio (data, _audio_position.get ())));
_audio_position = _audio_position.get() + data->frames ();
}
void
AudioDecoder::flush ()
{
if (!_resampler) {
return;
}
shared_ptr<const AudioBuffers> b = _resampler->flush ();
if (b) {
_pending.push_back (shared_ptr<DecodedAudio> (new DecodedAudio (b, _audio_position.get ())));
_audio_position = _audio_position.get() + b->frames ();
}
}
void
AudioDecoder::seek (ContentTime, bool)
{
_audio_position.reset ();
}
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