player_mod.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 SCUMM_PLAYERS_PLAYER_MOD_H
#define SCUMM_PLAYERS_PLAYER_MOD_H

#include "scumm/scumm.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
#include "common/mutex.h"

namespace Audio {
class RateConverter;
}

namespace Scumm {

class Player_MOD : public Audio::AudioStream {
public:
    Player_MOD(Audio::Mixer *mixer);
    ~Player_MOD() override;
    virtual void setMusicVolume(int vol);

    virtual void startChannel(int id, void *data, int size, int rate, uint8 vol, int loopStart = 0, int loopEnd = 0, int8 pan = 0);
    virtual void stopChannel(int id);
    virtual void setChannelVol(int id, uint8 vol);
    virtual void setChannelPan(int id, int8 pan);
    virtual void setChannelFreq(int id, int freq);

    typedef void ModUpdateProc(void *param);

    virtual void setUpdateProc(ModUpdateProc *proc, void *param, int freq);
    virtual void clearUpdateProc();

    // AudioStream API
    int readBuffer(int16 *buffer, const int numSamples) override {
        Common::StackLock lock(_mutex);
        do_mix(buffer, numSamples / 2);
        return numSamples;
    }
    bool isStereo() const override { return true; }
    bool endOfData() const override { return false; }
    int getRate() const override { return _sampleRate; }

private:
    enum {
        MOD_MAXCHANS = 24
    };

    struct soundChan {
        int id;
        uint8 vol;
        int8 pan;
        uint16 freq;

        uint32 ctr;
        int16 pos;
        Audio::AudioStream *input;
    };

    Audio::Mixer *_mixer;
    Audio::SoundHandle _soundHandle;
    Common::Mutex _mutex;

    uint32 _mixamt;
    uint32 _mixpos;
    const int _sampleRate;

    soundChan _channels[MOD_MAXCHANS];

    uint8 _maxvol;

    virtual void do_mix(int16 *buf, uint len);

    ModUpdateProc *_playproc;
    void *_playparam;
};

} // End of namespace Scumm

#endif