2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/decoder.h
21 * @brief Parent class for decoders of content.
24 #ifndef DVDOMATIC_DECODER_H
25 #define DVDOMATIC_DECODER_H
30 #include <boost/shared_ptr.hpp>
31 #include <boost/signals2.hpp>
46 * @brief Parent class for decoders of content.
48 * These classes can be instructed run through their content
49 * (by calling ::go), and they emit signals when video or audio data is ready for something else
55 Decoder (boost::shared_ptr<Film>, boost::shared_ptr<const Options>, Job *);
58 /* Methods to query our input video */
60 /** @return video frames per second, or 0 if unknown */
61 virtual float frames_per_second () const = 0;
62 /** @return native size in pixels */
63 virtual Size native_size () const = 0;
64 /** @return number of audio channels */
65 virtual int audio_channels () const = 0;
66 /** @return audio sampling rate in Hz */
67 virtual int audio_sample_rate () const = 0;
68 virtual int64_t audio_channel_layout () const = 0;
69 virtual bool has_subtitles () const = 0;
71 virtual int time_base_numerator () const = 0;
72 virtual int time_base_denominator () const = 0;
73 virtual int sample_aspect_ratio_numerator () const = 0;
74 virtual int sample_aspect_ratio_denominator () const = 0;
76 void process_begin ();
77 virtual bool pass () = 0;
81 SourceFrame video_frame () const {
85 virtual std::vector<AudioStream> audio_streams () const {
86 return std::vector<AudioStream> ();
89 virtual std::vector<SubtitleStream> subtitle_streams () const {
90 return std::vector<SubtitleStream> ();
93 /** Emitted when a video frame is ready.
94 * First parameter is the frame within the source.
95 * Second parameter is its index within the content.
96 * Third parameter is either 0 or a subtitle that should be on this frame.
98 boost::signals2::signal<void (boost::shared_ptr<Image>, SourceFrame, boost::shared_ptr<Subtitle>)> Video;
100 /** Emitted when some audio data is ready */
101 boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>, int64_t)> Audio;
105 virtual PixelFormat pixel_format () const = 0;
107 void process_video (AVFrame *);
108 void process_audio (boost::shared_ptr<AudioBuffers>);
109 void process_subtitle (boost::shared_ptr<TimedSubtitle>);
110 void repeat_last_video ();
113 boost::shared_ptr<Film> _film;
115 boost::shared_ptr<const Options> _opt;
116 /** associated Job, or 0 */
120 void emit_video (boost::shared_ptr<Image>, boost::shared_ptr<Subtitle>);
121 void emit_audio (boost::shared_ptr<AudioBuffers>);
123 SourceFrame _video_frame;
124 int64_t _audio_frame;
126 std::list<boost::shared_ptr<FilterGraph> > _filter_graphs;
128 DelayLine* _delay_line;
129 int _delay_in_frames;
131 boost::shared_ptr<TimedSubtitle> _timed_subtitle;
133 boost::shared_ptr<Image> _last_image;
134 boost::shared_ptr<Subtitle> _last_subtitle;