audio.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 PSP_AUDIO_H
#define PSP_AUDIO_H
 
#include "backends/platform/psp/thread.h"
 
class PspAudio : public PspThreadable {
public:
    enum {
        NUM_BUFFERS = 2,
        FREQUENCY = 44100   /* only frequency we allow */
    };
    typedef void (* callbackFunc)(void *userData, byte *samples, int len);  // audio callback to call
    PspAudio() : _pspChannel(0),
            _numOfChannels(0), _numOfSamples(0), _callback(0),
            _bufferToPlay(0), _bufferToFill(0),
            _init(false), _paused(true) {
        for (int i=0; i<NUM_BUFFERS; i++)
            _buffers[i] = 0;
    }
    ~PspAudio() { close(); }
    bool playBuffer();
    void nextBuffer(int &bufferIdx);
    bool open(uint32 freq, uint32 numOfChannels, uint32 numOfSamples, callbackFunc callback, void *userData);
    void close();
    uint32 getFrequency() { return FREQUENCY; }
    void pause() { _paused = true; }
    void unpause() { _paused = false; }
    virtual void threadFunction();  // actual audio thread
 
private:
    int _pspChannel;                // chosen hardware output channel
    uint32 _numOfChannels;          // 1 for mono; 2 for stereo
    uint32 _numOfSamples;
    callbackFunc _callback;         // the callback to call between outputting audio
    void *_userData;                // userData to send with callback
    byte *_buffers[NUM_BUFFERS];
    int _bufferToPlay;              // the next buffer to output
    int _bufferToFill;
    int _bufferSize;
    bool _init;                     // flag for initialization
    bool _paused;
};
 
#endif /* PSP_AUDIO_H */