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/ffmpeg_decoder.h
21 * @brief A decoder using FFmpeg to decode content.
27 #include <boost/shared_ptr.hpp>
28 #include <boost/optional.hpp>
29 #include <boost/thread/mutex.hpp>
31 #include <libavcodec/avcodec.h>
32 #include <libpostproc/postprocess.h>
36 #include "video_decoder.h"
37 #include "audio_decoder.h"
39 #include "ffmpeg_content.h"
42 struct AVCodecContext;
43 struct AVFilterContext;
44 struct AVFormatContext;
46 struct AVBufferContext;
54 /** @class FFmpegDecoder
55 * @brief A decoder using FFmpeg to decode content.
57 class FFmpegDecoder : public VideoDecoder, public AudioDecoder
60 FFmpegDecoder (boost::shared_ptr<const Film>, boost::shared_ptr<const FFmpegContent>, bool video, bool audio, bool subtitles, bool video_sync);
63 float video_frame_rate () const;
64 libdcp::Size native_size () const;
65 ContentVideoFrame video_length () const;
66 int time_base_numerator () const;
67 int time_base_denominator () const;
68 int sample_aspect_ratio_numerator () const;
69 int sample_aspect_ratio_denominator () const;
71 std::vector<FFmpegSubtitleStream> subtitle_streams () const {
72 return _subtitle_streams;
75 std::vector<FFmpegAudioStream> audio_streams () const {
76 return _audio_streams;
84 /* No copy construction */
85 FFmpegDecoder (FFmpegDecoder const &);
86 FFmpegDecoder& operator= (FFmpegDecoder const &);
88 PixelFormat pixel_format () const;
89 AVSampleFormat audio_sample_format () const;
90 int bytes_per_audio_sample () const;
92 void out_with_sync ();
93 void filter_and_emit_video (AVFrame *);
94 double frame_time () const;
96 void setup_general ();
99 void setup_subtitle ();
101 void decode_audio_packet ();
103 void maybe_add_subtitle ();
104 boost::shared_ptr<AudioBuffers> deinterleave_audio (uint8_t** data, int size);
106 void film_changed (Film::Property);
108 std::string stream_name (AVStream* s) const;
110 boost::shared_ptr<const FFmpegContent> _ffmpeg_content;
112 AVFormatContext* _format_context;
117 AVCodecContext* _video_codec_context;
118 AVCodec* _video_codec;
119 AVCodecContext* _audio_codec_context; ///< may be 0 if there is no audio
120 AVCodec* _audio_codec; ///< may be 0 if there is no audio
121 AVCodecContext* _subtitle_codec_context; ///< may be 0 if there is no subtitle
122 AVCodec* _subtitle_codec; ///< may be 0 if there is no subtitle
126 boost::optional<double> _first_video;
127 boost::optional<double> _first_audio;
129 std::list<boost::shared_ptr<FilterGraph> > _filter_graphs;
130 boost::mutex _filter_graphs_mutex;
132 std::vector<FFmpegSubtitleStream> _subtitle_streams;
133 std::vector<FFmpegAudioStream> _audio_streams;
137 bool _decode_subtitles;
140 /* It would appear (though not completely verified) that one must have
141 a mutex around calls to avcodec_open* and avcodec_close... and here
144 static boost::mutex _mutex;