AudioMixer.h

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/*
Copyright (C) 2005 The Pentagram team

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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
#ifndef AUDIOMIXER_H_INCLUDED
#define AUDIOMIXER_H_INCLUDED

class MidiDriver;

namespace Pentagram {
class AudioChannel;
class AudioSample;

class AudioMixer
{
public:
        AudioMixer(int sample_rate, bool stereo, int num_channels);
        ~AudioMixer(void);

        MidiDriver* getMidiDriver() const { return midi_driver; }

        static AudioMixer*      get_instance() { return the_audio_mixer; }

        void                    reset();
        void                    createProcesses();

        int                             playSample(AudioSample *sample, int loop, int priority, bool paused, uint32 pitch_shift, int lvol, int rvol);
        bool                    isPlaying(int chan);
        void                    stopSample(int chan);
        
        void                    setPaused(int chan, bool paused);
        bool                    isPaused(int chan);

        void                    setVolume(int chan, int lvol, int rvol);
        void                    getVolume(int chan, int &lvol, int &rvol);

        void                    openMidiOutput();
        void                    closeMidiOutput();

private:
        bool                    audio_ok;
        uint32                  sample_rate;
        bool                    stereo;
        MidiDriver *    midi_driver;
        int                             midi_volume;

        int                             num_channels;
        AudioChannel    **channels;

        void                    init_midi();
        static void             sdlAudioCallback(void *userdata, uint8 *stream, int len);

        void                    MixAudio(sint16 *stream, uint32 bytes);

        static AudioMixer* the_audio_mixer;

        void                    Lock();
        void                    Unlock();
};

};

#endif //AUDIOMIXER_H_INCLUDED

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