quicktime_intern.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/>.
 *
 */

#ifndef AUDIO_QUICKTIME_INTERN_H
#define AUDIO_QUICKTIME_INTERN_H

#include "common/formats/quicktime.h"
#include "common/scummsys.h"
#include "common/types.h"

#include "audio/audiostream.h"

namespace Common {
    class SeekableReadStream;
    class String;
}

namespace Audio {

class Codec;

class QuickTimeAudioDecoder : public Common::QuickTimeParser {
public:
    QuickTimeAudioDecoder();
    virtual ~QuickTimeAudioDecoder();

    bool loadAudioFile(const Common::Path &filename);

    bool loadAudioStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeFileHandle);

protected:
    class QuickTimeAudioTrack : public SeekableAudioStream {
    public:
        QuickTimeAudioTrack(QuickTimeAudioDecoder *decoder, Track *parentTrack);
        ~QuickTimeAudioTrack();

        // AudioStream API
        int readBuffer(int16 *buffer, const int numSamples);
        bool isStereo() const { return _queue->isStereo(); }
        int getRate() const { return _queue->getRate(); }
        bool endOfData() const;

        // SeekableAudioStream API
        bool seek(const Timestamp &where);
        Timestamp getLength() const;

        // Queue *at least* "length" audio
        // If length is zero, it queues the next logical block of audio whether
        // that be a whole edit or just one chunk within an edit
        void queueAudio(const Timestamp &length = Timestamp());
        Track *getParent() const { return _parentTrack; }
        void queueRemainingAudio();
        bool hasDataInQueue() const { return _samplesQueued != 0; }

    private:
        QuickTimeAudioDecoder *_decoder;
        Track *_parentTrack;
        QueuingAudioStream *_queue;
        uint _curChunk;
        Timestamp _curMediaPos, _skipSamples;
        uint32 _curEdit, _samplesQueued;
        bool _skipAACPrimer;

        QueuingAudioStream *createStream() const;
        AudioStream *readAudioChunk(uint chunk);
        bool isOldDemuxing() const;
        void skipSamples(const Timestamp &length, AudioStream *stream);
        void findEdit(const Timestamp &position);
        bool allDataRead() const;
        void enterNewEdit(const Timestamp &position);
        void queueStream(AudioStream *stream, const Timestamp &length);
        uint32 getAudioChunkSampleCount(uint chunk) const;
        Timestamp getChunkLength(uint chunk, bool skipAACPrimer = false) const;
        uint32 getAACSampleTime(uint32 totalSampleCount, bool skipAACPrimer = false) const;
        Timestamp getCurrentTrackTime() const;
    };

    class AudioSampleDesc : public Common::QuickTimeParser::SampleDesc {
    public:
        AudioSampleDesc(Common::QuickTimeParser::Track *parentTrack, uint32 codecTag);
        ~AudioSampleDesc();

        bool isAudioCodecSupported() const;

        AudioStream *createAudioStream(Common::SeekableReadStream *stream) const;
        void initCodec();

        // TODO: Make private in the long run
        uint16 _bitsPerSample;
        uint16 _channels;
        uint32 _sampleRate;
        uint32 _samplesPerFrame;
        uint32 _bytesPerFrame;

    private:
        Codec *_codec;
    };

    // Common::QuickTimeParser API
    virtual Common::QuickTimeParser::SampleDesc *readSampleDesc(Track *track, uint32 format, uint32 descSize);

    void init();

    Common::Array<QuickTimeAudioTrack *> _audioTracks;
};

} // End of namespace Audio

#endif