/*
 *
 * Copyright (C) 2009 Christian Gmeiner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#ifndef _AUDIO_H_
#define _AUDIO_H_

#include "settings.h"
#include <vdr/tools.h>  // for uchar

struct SampleContext {
   int channels;
   int samplerate;
};

class iAudio : public iSettingsObserver {
public:
    iAudio();
    virtual ~iAudio() {}

    virtual void openDevice() = 0;
    virtual void releaseDevice() = 0;
    virtual void setup(int channels, int samplerate) = 0;
    virtual void write(uchar* data, size_t size) = 0;
    virtual void flush() = 0;

    virtual void poll(cPoller &poller) { (void)poller; }

    void setEnabled(bool on)    { dsyslog("audio enable %d", (int)on); enabled = on; }
    void setVolume(int v)       { vol = v; }
    void mute()                 { setVolume(0); }

    void changeVolume(short* pcmbuf, size_t size);
    void setAudioChannel(int channel)   { audioChannel = channel; }
    int getAudioChannel()               { return audioChannel; }

    virtual void setDigitalAudio(bool on) = 0;
    bool isDigitalAudio()                   { return digitalAudio; }

    virtual void settingsChange(SettingsChange change);
    virtual void reconfigure() {}

protected:
    bool open;
    bool enabled;
    int vol;
    int audioChannel;
    bool digitalAudio;
    SampleContext curContext;
};

#endif /*_AUDIO_H_*/