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selove / src / modules / audio / Audio.h

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/**
* Copyright (c) 2006-2012 LOVE Development Team
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented = 0; you must not
*    claim that you wrote the original software. If you use this software
*    in a product, an acknowledgment in the product documentation would be
*    appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/

#ifndef LOVE_AUDIO_AUDIO_H
#define LOVE_AUDIO_AUDIO_H

#include <common/Module.h>
#include <common/StringMap.h>
#include "Source.h"

namespace love
{
namespace sound
{
	class Decoder;
	class SoundData;
}
namespace audio
{
	/**
	* The Audio module is responsible for playing back raw sound samples.
	**/
	class Audio : public Module
	{
	public:

		/**
		* Attenuation by distance.
		*/
		enum DistanceModel
		{
			DISTANCE_NONE = 1,
			DISTANCE_INVERSE,
			DISTANCE_INVERSE_CLAMPED,
			DISTANCE_LINEAR,
			DISTANCE_LINEAR_CLAMPED,
			DISTANCE_EXPONENT,
			DISTANCE_EXPONENT_CLAMPED,
			DISTANCE_MAX_ENUM
		};
		
		static bool getConstant(const char * in, DistanceModel & out);
		static bool getConstant(DistanceModel in, const char *& out);

		/**
		* Destructor.
		**/
		virtual ~Audio(){};

		virtual Source * newSource(love::sound::Decoder * decoder) = 0;
		virtual Source * newSource(love::sound::SoundData * soundData) = 0;

		/**
		* Gets the current number of simultaneous playing sources.
		* @return The current number of simultaneous playing sources.
		**/
		virtual int getNumSources() const = 0;

		/**
		* Gets the maximum supported number of simultaneous playing sources.
		* @return The maximum supported number of simultaneous playing sources.
		**/
		virtual int getMaxSources() const = 0;

		/**
		* Play the specified Source.
		* @param source The Source to play.
		**/
		virtual void play(Source * source) = 0;

		/**
		* Stops playback on the specified source.
		* @param source The source on which to stop the playback.
		**/
		virtual void stop(Source * source) = 0;

		/**
		* Stops all playing audio.
		**/
		virtual void stop() = 0;

		/**
		* Pauses playback on the specified source.
		* @param source The source on which to pause the playback.
		**/
		virtual void pause(Source * source) = 0;

		/**
		* Pauses all audio.
		**/
		virtual void pause() = 0;

		/**
		* Resumes playback on the specified source.
		* @param source The source on which to resume the playback.
		**/
		virtual void resume(Source * source) = 0;

		/**
		* Resumes all audio.
		**/
		virtual void resume() = 0;

		/**
		* Rewinds the specified source. Whatever is playing on this
		* source gets rewound to the start.
		* @param source The source to rewind.
		**/
		virtual void rewind(Source * source) = 0;

		/**
		* Rewinds all playing audio.
		**/
		virtual void rewind() = 0;

		/**
		* Sets the master volume, where 0.0f is min (off) and 1.0f is max.
		* @param volume The new master volume.
		**/
		virtual void setVolume(float volume) = 0;

		/**
		* Gets the master volume.
		* @return The current master volume.
		**/
		virtual float getVolume() const = 0;

		/**
		* Gets the position of the listener.
		* @param v A float array of size 3 containing (x,y,z) in that order.
		**/
		virtual void getPosition(float * v) const = 0;

		/**
		* Sets the position of the listener.
		* @param v A float array of size 3 containing [x,y,z] in that order.
		**/
		virtual void setPosition(float * v) = 0;

		/**
		* Gets the orientation of the listener.
		* @param v A float array of size 6 containing [x,y,z] for the forward
		* vector, followed by [x,y,z] for the up vector.
		**/
		virtual void getOrientation(float * v) const = 0;

		/**
		* Sets the orientation of the listener.
		* @param v A float array of size 6 containing [x,y,z] for the forward
		* vector, followed by [x,y,z] for the up vector.
		**/
		virtual void setOrientation(float * v) = 0;

		/**
		* Gets the velocity of the listener.
		* @param v A float array of size 3 containing [x,y,z] in that order.
		**/
		virtual void getVelocity(float * v) const = 0;

		/**
		* Sets the velocity of the listener.
		* @param v A float array of size 3 containing [x,y,z] in that order.
		**/
		virtual void setVelocity(float * v) = 0;

		/**
		* Begins recording audio input from the microphone.
		**/
		virtual void record() = 0;

		/**
		* Gets a section of recorded audio.
		* Per OpenAL, the measurement begins from the start of the
		* audio data in memory, which is after the last time this function
		* was called. If this function has not been called yet this recording
		* session, it just grabs from the beginning.
		* @return All the recorded SoundData thus far.
		**/
		virtual love::sound::SoundData * getRecordedData() = 0;

		/**
		* Stops recording and, if passed true, returns all the recorded audio
		* not already gotten by getRecordedData.
		* @param returnData Whether to return recorded audio.
		* @return if returnData, all the recorded audio yet to be gotten,
		* otherwise NULL.
		**/
		virtual love::sound::SoundData * stopRecording(bool returnData) = 0;

		/**
		* Checks whether LOVE is able to record audio input.
		* @return hasMic Whether LOVE has a microphone enabled.
		**/
		virtual bool canRecord() = 0;

		/**
		* Gets the distance model used for attenuation.
		* @return Distance model.
		*/
		virtual DistanceModel getDistanceModel() const = 0;

		/**
		* Sets the distance model used for attenuation.
		* @param distanceModel Distance model.
		*/
		virtual void setDistanceModel(DistanceModel distanceModel) = 0;

	private:
			
		static StringMap<DistanceModel, DISTANCE_MAX_ENUM>::Entry distanceModelEntries[];
		static StringMap<DistanceModel, DISTANCE_MAX_ENUM> distanceModels;
	}; // Audio

} // audio
} // love

#endif // LOVE_AUDIO_AUDIO_H