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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.
*/
/** @file src/transcoder.cc
* @brief A class which takes a Film and some Options, then uses those to transcode the film.
*
* A decoder is selected according to the content type, and the encoder can be specified
* as a parameter to the constructor.
*/
#include <iostream>
#include <boost/signals2.hpp>
#include "transcoder.h"
#include "encoder.h"
#include "decoder_factory.h"
#include "film.h"
#include "matcher.h"
#include "delay_line.h"
#include "options.h"
#include "gain.h"
using std::string;
using boost::shared_ptr;
/** Construct a transcoder using a Decoder that we create and a supplied Encoder.
* @param f Film that we are transcoding.
* @param o Options.
* @param j Job that we are running under, or 0.
* @param e Encoder to use.
*/
Transcoder::Transcoder (shared_ptr<Film> f, shared_ptr<const Options> o, Job* j, shared_ptr<Encoder> e)
: _job (j)
, _encoder (e)
, _decoder (decoder_factory (f, o, j))
{
assert (_encoder);
if (f->audio_stream()) {
AudioStream st = f->audio_stream().get();
_matcher.reset (new Matcher (f->log(), st.sample_rate(), f->frames_per_second()));
_delay_line.reset (new DelayLine (f->log(), st.channels(), f->audio_delay() * st.sample_rate() / 1000));
_gain.reset (new Gain (f->log(), f->audio_gain()));
}
/* Set up the decoder to use the film's set streams */
_decoder->set_audio_stream (f->audio_stream ());
_decoder->set_subtitle_stream (f->subtitle_stream ());
if (_matcher) {
_decoder->connect_video (_matcher);
_matcher->connect_video (_encoder);
} else {
_decoder->connect_video (_encoder);
}
if (_matcher && _delay_line) {
_decoder->connect_audio (_delay_line);
_delay_line->connect_audio (_matcher);
_matcher->connect_audio (_gain);
_gain->connect_audio (_encoder);
}
}
/** Run the decoder, passing its output to the encoder, until the decoder
* has no more data to present.
*/
void
Transcoder::go ()
{
_encoder->process_begin ();
try {
_decoder->go ();
} catch (...) {
/* process_end() is important as the decoder may have worker
threads that need to be cleaned up.
*/
_encoder->process_end ();
throw;
}
_encoder->process_end ();
}
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