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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/decoder.cc
* @brief Parent class for decoders of content.
*/
#include <iostream>
#include <stdint.h>
#include <boost/lexical_cast.hpp>
#include "film.h"
#include "format.h"
#include "job.h"
#include "options.h"
#include "exceptions.h"
#include "image.h"
#include "util.h"
#include "log.h"
#include "decoder.h"
#include "delay_line.h"
#include "subtitle.h"
#include "filter_graph.h"
using std::string;
using std::stringstream;
using std::min;
using std::pair;
using std::list;
using boost::shared_ptr;
using boost::optional;
/** @param f Film.
* @param o Options.
* @param j Job that we are running within, or 0
*/
Decoder::Decoder (boost::shared_ptr<Film> f, boost::shared_ptr<const Options> o, Job* j)
: _film (f)
, _opt (o)
, _job (j)
, _video_frame (0)
{
}
/** Start decoding */
void
Decoder::go ()
{
if (_job && !_film->dcp_length()) {
_job->set_progress_unknown ();
}
while (pass () == false) {
if (_job && _film->dcp_length()) {
_job->set_progress (float (_video_frame) / _film->length().get());
}
}
}
/** Called by subclasses to tell the world that some video data is ready.
* We find a subtitle then emit it for listeners.
* @param frame to decode; caller manages memory.
*/
void
Decoder::emit_video (shared_ptr<Image> image)
{
shared_ptr<Subtitle> sub;
if (_timed_subtitle && _timed_subtitle->displayed_at (double (video_frame()) / _film->frames_per_second())) {
sub = _timed_subtitle->subtitle ();
}
signal_video (image, sub);
}
void
Decoder::repeat_last_video ()
{
if (!_last_image) {
_last_image.reset (new CompactImage (pixel_format(), native_size()));
_last_image->make_black ();
}
signal_video (_last_image, _last_subtitle);
}
void
Decoder::signal_video (shared_ptr<Image> image, shared_ptr<Subtitle> sub)
{
TIMING ("Decoder emits %1", _video_frame);
Video (image, sub);
++_video_frame;
_last_image = image;
_last_subtitle = sub;
}
void
Decoder::emit_subtitle (shared_ptr<TimedSubtitle> s)
{
_timed_subtitle = s;
if (_timed_subtitle && _opt->apply_crop) {
Position const p = _timed_subtitle->subtitle()->position ();
_timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
}
}
void
Decoder::set_audio_stream (optional<AudioStream> s)
{
_audio_stream = s;
}
void
Decoder::set_subtitle_stream (optional<SubtitleStream> s)
{
_subtitle_stream = s;
}
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