/*
 * Copyright (c) 2009, The MilkyTracker Team.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - Neither the name of the <ORGANIZATION> nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  MasterMixer.h
 *  MilkyPlay
 *
 *  Created by Peter Barth on 14.12.07.
 *
 */

#ifndef __MASTERMIXER_H__
#define __MASTERMIXER_H__

#include "Mixable.h"

class MasterMixer
{
public:
	enum MasterMixerNotifications
	{
		MasterMixerNotificationBufferSizeChanged,
		MasterMixerNotificationSampleRateChanged
	};

	class MasterMixerNotificationListener
	{
	public:
		virtual ~MasterMixerNotificationListener()
		{
		}
	
		virtual void masterMixerNotification(MasterMixerNotifications notification) = 0;
	};

	MasterMixer(mp_uint32 sampleRate, 
				mp_uint32 bufferSize = 0, 
				mp_uint32 numDevices = 1,
				class AudioDriverInterface* audioDriver = 0);
	
	virtual ~MasterMixer();
	
	void setMasterMixerNotificationListener(MasterMixerNotificationListener* listener);

	mp_sint32 openAudioDevice();
	mp_sint32 closeAudioDevice();

	mp_sint32 start();
	mp_sint32 stop();
	mp_sint32 pause();
	mp_sint32 resume();
	
	bool isPlaying() const { return started; }
	bool isPaused() const { return paused; }
	bool isInitialized() const { return initialized; }
	bool isActive() const { return started && !paused; }
	
	mp_sint32 setBufferSize(mp_uint32 bufferSize);
	mp_uint32 getBufferSize() const { return bufferSize; }
	
	mp_sint32 setSampleRate(mp_uint32 sampleRate);
	mp_uint32 getSampleRate() const { return sampleRate; }
	
	bool addDevice(Mixable* device, bool paused = false);
	bool removeDevice(Mixable* device, bool blocking = true); 
	bool isDeviceRemoved(Mixable* device);

	bool pauseDevice(Mixable* device, bool blocking = true);
	bool resumeDevice(Mixable* device);
	bool isDevicePaused(Mixable* device);
		
	void mixerHandler(mp_sword* buffer);
	
	// allows to control the loudness of the resulting output stream
	// by bit-shifting the output *right* (dividing by 2^shift)
	void setSampleShift(mp_sint32 shift) { sampleShift = shift; }
	mp_uint32 getSampleShift() const { return sampleShift; }	

	// disable mixing... you don't need to understand this
	void setDisableMixing(bool disableMixing) { this->disableMixing = disableMixing; }
	
	void setFilterHook(Mixable* filterHook) { this->filterHook = filterHook; }
	Mixable* getFilterHook(Mixable* filterHook) const { return filterHook; }
	
	// some legacy functions used by milkytracker
	const class AudioDriverInterface* getAudioDriver() const { return audioDriver; }
	
	const char*	getCurrentAudioDriverName() const;
	bool setCurrentAudioDriverByName(const char* name);

	const class AudioDriverManager* getAudioDriverManager() const;
	
	mp_sint32 getCurrentSample(mp_sint32 position, mp_sint32 channel);
	mp_sint32 getCurrentSamplePeak(mp_sint32 position, mp_sint32 channel);	
			
private:
	MasterMixerNotificationListener* listener;
	mp_uint32 sampleRate;
	mp_uint32 bufferSize;
	mp_sint32* buffer;
	mp_uint32 sampleShift;
	bool disableMixing;
	mp_uint32 numDevices;
	Mixable* filterHook;

	struct DeviceDescriptor
	{
		Mixable* mixable;
		bool markedForRemoval;
		bool markedForPause;
		bool paused;
	
		DeviceDescriptor() :
			mixable(0),
			markedForRemoval(false),
			markedForPause(false),
			paused(false)
		{
		}
	};
	
	DeviceDescriptor* devices;
	
	mutable class AudioDriverManager* audioDriverManager;
	AudioDriverInterface* audioDriver;
	
	bool initialized;
	bool started;
	bool paused;
	
	void notifyListener(MasterMixerNotifications notification);
	
	void cleanup();
	
	inline void prepareBuffer();
	inline void swapOutBuffer(mp_sword* bufferOut);
};

#endif