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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.h
* @brief Parent class for decoders of content.
*/
#ifndef DVDOMATIC_DECODER_H
#define DVDOMATIC_DECODER_H
#include <vector>
#include <string>
#include <stdint.h>
#include <boost/shared_ptr.hpp>
#include <boost/signals2.hpp>
#include "util.h"
#include "stream.h"
class Job;
class Options;
class Image;
class Log;
class DelayLine;
class TimedSubtitle;
class Subtitle;
class Film;
class FilterGraph;
/** @class Decoder.
* @brief Parent class for decoders of content.
*
* These classes can be instructed run through their content
* (by calling ::go), and they emit signals when video or audio data is ready for something else
* to process.
*/
class Decoder
{
public:
Decoder (boost::shared_ptr<Film>, boost::shared_ptr<const Options>, Job *, bool, bool);
virtual ~Decoder ();
/* Methods to query our input video */
/** @return video frames per second, or 0 if unknown */
virtual float frames_per_second () const = 0;
/** @return native size in pixels */
virtual Size native_size () const = 0;
/** @return number of audio channels */
virtual int audio_channels () const = 0;
/** @return audio sampling rate in Hz */
virtual int audio_sample_rate () const = 0;
/** @return format of audio samples */
virtual AVSampleFormat audio_sample_format () const = 0;
virtual int64_t audio_channel_layout () const = 0;
virtual bool has_subtitles () const = 0;
virtual int time_base_numerator () const = 0;
virtual int time_base_denominator () const = 0;
virtual int sample_aspect_ratio_numerator () const = 0;
virtual int sample_aspect_ratio_denominator () const = 0;
void process_begin ();
bool pass ();
void process_end ();
void go ();
/** @return the index of the last video frame to be processed */
int video_frame_index () const {
return _video_frame_index;
}
virtual std::vector<AudioStream> audio_streams () const {
return std::vector<AudioStream> ();
}
virtual std::vector<SubtitleStream> subtitle_streams () const {
return std::vector<SubtitleStream> ();
}
/** Emitted when a video frame is ready.
* First parameter is the frame.
* Second parameter is its index within the content.
* Third parameter is either 0 or a subtitle that should be on this frame.
*/
boost::signals2::signal<void (boost::shared_ptr<Image>, int, boost::shared_ptr<Subtitle>)> Video;
/** Emitted when some audio data is ready */
boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>)> Audio;
protected:
/** perform a single pass at our content */
virtual bool do_pass () = 0;
virtual PixelFormat pixel_format () const = 0;
void process_video (AVFrame *);
void process_audio (uint8_t *, int);
void process_subtitle (boost::shared_ptr<TimedSubtitle>);
void repeat_last_video ();
int bytes_per_audio_sample () const;
/** our Film */
boost::shared_ptr<Film> _film;
/** our options */
boost::shared_ptr<const Options> _opt;
/** associated Job, or 0 */
Job* _job;
/** true to do the bare minimum of work; just run through the content. Useful for acquiring
* accurate frame counts as quickly as possible. This generates no video or audio output.
*/
bool _minimal;
/** ignore_length Ignore the content's claimed length when computing progress */
bool _ignore_length;
private:
void emit_audio (uint8_t* data, int size);
/** last video frame to be processed */
int _video_frame_index;
std::list<boost::shared_ptr<FilterGraph> > _filter_graphs;
DelayLine* _delay_line;
int _delay_in_bytes;
/* Number of audio frames that we have pushed to the encoder
(at the DCP sample rate).
*/
int64_t _audio_frames_processed;
boost::shared_ptr<TimedSubtitle> _timed_subtitle;
boost::shared_ptr<Image> _last_image;
boost::shared_ptr<Subtitle> _last_subtitle;
};
#endif
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