audiocd-stream.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/>.
 *
 * Original license header:
 *
 * Cabal - Legacy Game Implementations
 *
 * Cabal 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 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BACKENDS_AUDIOCD_AUDIOCD_STREAM_H
#define BACKENDS_AUDIOCD_AUDIOCD_STREAM_H

#include "audio/audiostream.h"
#include "common/mutex.h"
#include "common/queue.h"
#include "common/timer.h"

class AudioCDStream : public Audio::SeekableAudioStream {
public:
    AudioCDStream();
    ~AudioCDStream();

    int readBuffer(int16 *buffer, const int numSamples);
    bool isStereo() const { return true; }
    int getRate() const { return 44100; }
    bool endOfData() const;
    bool seek(const Audio::Timestamp &where);
    Audio::Timestamp getLength() const;

protected:
    virtual uint getStartFrame() const = 0;
    virtual uint getEndFrame() const = 0;
    virtual bool readFrame(int frame, int16 *buffer) = 0;

    void startTimer(bool fillBuffer = false);
    void stopTimer();

    enum {
        kBytesPerFrame = 2352,
        kSamplesPerFrame = kBytesPerFrame / 2
    };

    enum {
        kSecondsPerMinute = 60,
        kFramesPerSecond = 75
    };

    enum {
        // Keep about a second's worth of audio in the buffer
        kBufferThreshold = kFramesPerSecond
    };

private:
    int16 _buffer[kSamplesPerFrame];
    int _frame;
    uint _bufferPos;

    Common::Queue<int16 *> _bufferQueue;
    int _bufferFrame;
    Common::Mutex _mutex;

    bool _forceStop;
    bool shouldForceStop() const;
    void forceStop();
    Common::Mutex _forceStopMutex;

    bool readNextFrame();
    static void timerProc(void *refCon);
    void onTimer();
    void emptyQueue();
};

#endif