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 *, bool, bool);
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 /** @return format of audio samples */
69 virtual AVSampleFormat audio_sample_format () const = 0;
70 virtual int64_t audio_channel_layout () const = 0;
71 virtual bool has_subtitles () const = 0;
73 virtual int time_base_numerator () const = 0;
74 virtual int time_base_denominator () const = 0;
75 virtual int sample_aspect_ratio_numerator () const = 0;
76 virtual int sample_aspect_ratio_denominator () const = 0;
78 void process_begin ();
83 /** @return the index of the last video frame to be processed */
84 int video_frame_index () const {
85 return _video_frame_index;
88 virtual std::vector<AudioStream> audio_streams () const {
89 return std::vector<AudioStream> ();
92 virtual std::vector<SubtitleStream> subtitle_streams () const {
93 return std::vector<SubtitleStream> ();
96 /** Emitted when a video frame is ready.
97 * First parameter is the frame.
98 * Second parameter is its index within the content.
99 * Third parameter is either 0 or a subtitle that should be on this frame.
101 boost::signals2::signal<void (boost::shared_ptr<Image>, int, boost::shared_ptr<Subtitle>)> Video;
103 /** Emitted when some audio data is ready */
104 boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>)> Audio;
108 /** perform a single pass at our content */
109 virtual bool do_pass () = 0;
110 virtual PixelFormat pixel_format () const = 0;
112 void process_video (AVFrame *);
113 void process_audio (uint8_t *, int);
114 void process_subtitle (boost::shared_ptr<TimedSubtitle>);
115 void repeat_last_video ();
117 int bytes_per_audio_sample () const;
120 boost::shared_ptr<Film> _film;
122 boost::shared_ptr<const Options> _opt;
123 /** associated Job, or 0 */
126 /** true to do the bare minimum of work; just run through the content. Useful for acquiring
127 * accurate frame counts as quickly as possible. This generates no video or audio output.
131 /** ignore_length Ignore the content's claimed length when computing progress */
135 void emit_audio (uint8_t* data, int size);
137 /** last video frame to be processed */
138 int _video_frame_index;
140 std::list<boost::shared_ptr<FilterGraph> > _filter_graphs;
142 DelayLine* _delay_line;
145 /* Number of audio frames that we have pushed to the encoder
146 (at the DCP sample rate).
148 int64_t _audio_frames_processed;
150 boost::shared_ptr<TimedSubtitle> _timed_subtitle;
152 boost::shared_ptr<Image> _last_image;
153 boost::shared_ptr<Subtitle> _last_subtitle;