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Diffstat (limited to 'src/lib/decoder.h')
| -rw-r--r-- | src/lib/decoder.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/lib/decoder.h b/src/lib/decoder.h new file mode 100644 index 000000000..db51879a1 --- /dev/null +++ b/src/lib/decoder.h @@ -0,0 +1,136 @@ +/* + 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 <sigc++/sigc++.h> +#include "util.h" + +class Job; +class FilmState; +class Options; +class Image; +class Log; +class DelayLine; + +/** @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<const FilmState>, boost::shared_ptr<const Options>, Job *, Log *, bool, bool); + virtual ~Decoder (); + + /* Methods to query our input video */ + + /** @return length in video frames */ + virtual int length_in_frames () const = 0; + /** @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; + + void process_begin (); + bool pass (); + void process_end (); + void go (); + + /** @return the index of the last video frame to be processed */ + int last_video_frame () const { + return _video_frame; + } + + int decoding_frames () const; + + /** Emitted when a video frame is ready. + * First parameter is the frame. + * Second parameter is its index within the content. + */ + sigc::signal<void, boost::shared_ptr<Image>, int> Video; + + /** Emitted when some audio data is ready. + * First parameter is the interleaved sample data, format is given in the FilmState. + * Second parameter is the size of the data. + */ + sigc::signal<void, uint8_t *, int> Audio; + +protected: + /** perform a single pass at our content */ + virtual bool do_pass () = 0; + virtual PixelFormat pixel_format () 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_video (AVFrame *); + void process_audio (uint8_t *, int, int); + + /** our FilmState */ + boost::shared_ptr<const FilmState> _fs; + /** our options */ + boost::shared_ptr<const Options> _opt; + /** associated Job, or 0 */ + Job* _job; + /** log that we can write to */ + Log* _log; + + /** 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 setup_video_filters (); + + /** last video frame to be processed */ + int _video_frame; + + AVFilterContext* _buffer_src_context; + AVFilterContext* _buffer_sink_context; + + bool _have_setup_video_filters; + DelayLine* _delay_line; + int _delay_in_bytes; +}; + +#endif |