- Decoder (boost::shared_ptr<Film>, boost::shared_ptr<const Options>, Job *, bool, bool);
- virtual ~Decoder ();
-
- /* Methods to query our input video */
-
- /** @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;
- virtual int64_t audio_channel_layout () const = 0;
- virtual bool has_subtitles () 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_begin ();
- virtual bool pass () = 0;
- void process_end ();
- void go ();
-
- /** @return the index of the last video frame to be processed */
- int video_frame_index () const {
- return _video_frame_index;
- }
-
- virtual std::vector<AudioStream> audio_streams () const {
- return std::vector<AudioStream> ();
- }
-
- virtual std::vector<SubtitleStream> subtitle_streams () const {
- return std::vector<SubtitleStream> ();
- }
-
- /** Emitted when a video frame is ready.
- * First parameter is the frame.
- * Second parameter is its index within the content.
- * Third parameter is either 0 or a subtitle that should be on this frame.
- */
- boost::signals2::signal<void (boost::shared_ptr<Image>, int, boost::shared_ptr<Subtitle>)> Video;
-
- /** Emitted when some audio data is ready */
- boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>)> Audio;
-
-protected:
-
- virtual PixelFormat pixel_format () const = 0;
-
- void process_video (AVFrame *);
- void process_audio (uint8_t *, int);
- void process_subtitle (boost::shared_ptr<TimedSubtitle>);
- void repeat_last_video ();
-
- int bytes_per_audio_sample () const;
-
- /** our Film */
- boost::shared_ptr<Film> _film;
- /** our options */
- boost::shared_ptr<const Options> _opt;
- /** associated Job, or 0 */
- Job* _job;
-
- /** 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.
+ virtual ~Decoder () {}
+
+ boost::shared_ptr<VideoDecoder> video;
+ boost::shared_ptr<AudioDecoder> audio;
+ boost::shared_ptr<SubtitleDecoder> subtitle;
+
+ enum PassReason {
+ PASS_REASON_VIDEO,
+ PASS_REASON_AUDIO,
+ PASS_REASON_SUBTITLE
+ };
+
+ /** Seek so that the next pass() will yield the next thing
+ * (video/sound frame, subtitle etc.) at or after the requested
+ * time. Pass accurate = true to try harder to ensure that, at worst,
+ * the next thing we yield comes before `time'. This may entail
+ * seeking some way before `time' to be on the safe side.
+ * Alternatively, if seeking is 100% accurate for this decoder,
+ * it may seek to just the right spot.