theora_decoder.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */
 
#include "common/scummsys.h"    // for USE_THEORADEC
 
#ifdef USE_THEORADEC
 
#ifndef VIDEO_THEORA_DECODER_H
#define VIDEO_THEORA_DECODER_H
 
#include "common/rational.h"
#include "video/video_decoder.h"
#include "audio/mixer.h"
#include "graphics/surface.h"
 
#include <theora/theoradec.h>
 
#ifdef USE_TREMOR
#include <tremor/ivorbiscodec.h>
#else
#include <vorbis/codec.h>
#endif
 
namespace Common {
class SeekableReadStream;
}
 
namespace Audio {
class AudioStream;
class QueuingAudioStream;
}
 
namespace Video {
 
class TheoraDecoder : public VideoDecoder {
public:
    TheoraDecoder();
    virtual ~TheoraDecoder();
 
    bool loadStream(Common::SeekableReadStream *stream) override;
    void close() override;
 
    Common::Rational getFrameRate() const;
 
protected:
    void readNextPacket() override;
 
private:
    class TheoraVideoTrack : public VideoTrack {
    public:
        TheoraVideoTrack(th_info &theoraInfo, th_setup_info *theoraSetup);
        ~TheoraVideoTrack();
 
        bool endOfTrack() const override { return _endOfVideo; }
        uint16 getWidth() const override { return _width; }
        uint16 getHeight() const override { return _height; }
        Graphics::PixelFormat getPixelFormat() const override { return _pixelFormat; }
        bool setOutputPixelFormat(const Graphics::PixelFormat &format) override {
            if (format.bytesPerPixel != 2 && format.bytesPerPixel != 4)
                return false;
            _pixelFormat = format;
            return true;
        }
 
        int getCurFrame() const override { return _curFrame; }
        const Common::Rational &getFrameRate() const { return _frameRate; }
        uint32 getNextFrameStartTime() const override { return (uint32)(_nextFrameStartTime * 1000); }
        const Graphics::Surface *decodeNextFrame() override { return _displaySurface; }
 
        bool decodePacket(ogg_packet &oggPacket);
        void setEndOfVideo() { _endOfVideo = true; }
 
    private:
        int _curFrame;
        bool _endOfVideo;
        Common::Rational _frameRate;
        double _nextFrameStartTime;
 
        Graphics::Surface *_surface;
        Graphics::Surface *_displaySurface;
        Graphics::PixelFormat _pixelFormat;
        int _x;
        int _y;
        uint16 _width;
        uint16 _height;
        uint16 _surfaceWidth;
        uint16 _surfaceHeight;
 
        th_dec_ctx *_theoraDecode;
        th_pixel_fmt _theoraPixelFormat;
 
        void translateYUVtoRGBA(th_ycbcr_buffer &YUVBuffer);
    };
 
    class VorbisAudioTrack : public AudioTrack {
    public:
        VorbisAudioTrack(Audio::Mixer::SoundType soundType, vorbis_info &vorbisInfo);
        ~VorbisAudioTrack();
 
        bool decodeSamples();
        bool hasAudio() const;
        bool needsAudio() const;
        void synthesizePacket(ogg_packet &oggPacket);
        void setEndOfAudio() { _endOfAudio = true; }
 
    protected:
        Audio::AudioStream *getAudioStream() const override;
 
    private:
        // single audio fragment audio buffering
        int _audioBufferFill;
        ogg_int16_t *_audioBuffer;
 
        Audio::QueuingAudioStream *_audStream;
 
        vorbis_block _vorbisBlock;
        vorbis_dsp_state _vorbisDSP;
 
        bool _endOfAudio;
    };
 
    void queuePage(ogg_page *page);
    int bufferData();
    bool queueAudio();
    void ensureAudioBufferSize();
 
    Common::SeekableReadStream *_fileStream;
 
    ogg_sync_state _oggSync;
    ogg_page _oggPage;
    ogg_packet _oggPacket;
 
    ogg_stream_state _theoraOut, _vorbisOut;
    bool _hasVideo, _hasAudio;
 
    vorbis_info _vorbisInfo;
 
    TheoraVideoTrack *_videoTrack;
    VorbisAudioTrack *_audioTrack;
};
 
} // End of namespace Video
 
#endif
 
#endif