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 <sigc++/sigc++.h>
42 * @brief Parent class for decoders of content.
44 * These classes can be instructed run through their content
45 * (by calling ::go), and they emit signals when video or audio data is ready for something else
51 Decoder (boost::shared_ptr<const FilmState>, boost::shared_ptr<const Options>, Job *, Log *, bool, bool);
54 /* Methods to query our input video */
56 /** @return length in video frames */
57 virtual int length_in_frames () const = 0;
58 /** @return video frames per second, or 0 if unknown */
59 virtual float frames_per_second () const = 0;
60 /** @return native size in pixels */
61 virtual Size native_size () const = 0;
62 /** @return number of audio channels */
63 virtual int audio_channels () const = 0;
64 /** @return audio sampling rate in Hz */
65 virtual int audio_sample_rate () const = 0;
66 /** @return format of audio samples */
67 virtual AVSampleFormat audio_sample_format () const = 0;
69 void process_begin ();
74 /** @return the index of the last video frame to be processed */
75 int last_video_frame () const {
79 int decoding_frames () const;
81 /** Emitted when a video frame is ready.
82 * First parameter is the frame.
83 * Second parameter is its index within the content.
85 sigc::signal<void, boost::shared_ptr<Image>, int> Video;
87 /** Emitted when some audio data is ready.
88 * First parameter is the interleaved sample data, format is given in the FilmState.
89 * Second parameter is the size of the data.
91 sigc::signal<void, uint8_t *, int> Audio;
94 /** perform a single pass at our content */
95 virtual bool do_pass () = 0;
96 virtual PixelFormat pixel_format () const = 0;
97 virtual int time_base_numerator () const = 0;
98 virtual int time_base_denominator () const = 0;
99 virtual int sample_aspect_ratio_numerator () const = 0;
100 virtual int sample_aspect_ratio_denominator () const = 0;
102 void process_video (AVFrame *);
103 void process_audio (uint8_t *, int, int);
106 boost::shared_ptr<const FilmState> _fs;
108 boost::shared_ptr<const Options> _opt;
109 /** associated Job, or 0 */
111 /** log that we can write to */
114 /** true to do the bare minimum of work; just run through the content. Useful for acquiring
115 * accurate frame counts as quickly as possible. This generates no video or audio output.
119 /** ignore_length Ignore the content's claimed length when computing progress */
123 void setup_video_filters ();
125 /** last video frame to be processed */
128 AVFilterContext* _buffer_src_context;
129 AVFilterContext* _buffer_sink_context;
131 bool _have_setup_video_filters;
132 DelayLine* _delay_line;