audio.h
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audio.h
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	#ifndef _rtech1_audio_h
	#define _rtech1_audio_h

	/* Deals with audio conversion between any source format and any destination format.
	* A format consists of
	* byte encoding (8/16/32 bit, signed/unsigned, floating point/integer)
	* number of channels (mono/stereo)
	* frequency (22050hz, 44100hz, arbitrary hz)
	*/

	namespace Util{

	/* endianness is always native */
	enum Encoding{
	Unsigned8,
	Signed16,
	Unsigned16,
	Float32
	};

	class AudioConverter{
	public:
	AudioConverter(Encoding inputEncoding, int inputChannels, int inputFrequency,
	Encoding outputEncoding, int outputChannels, int outputFrequency);

	/* given some input length, return how long the converted output will be */
	unsigned int convertedLength(int length);

	/* convert the audio, put the output in the same buffer passed in -- 'input'
	* and returns the number of converted samples.
	* 'length' is the number of input samples in bytes
	* 'input' should be large enough to hold convertedLength(length) samples
	*/
	int convert(void * input, int length);

	virtual ~AudioConverter();

	protected:
	struct Format{
	Encoding bytes;
	int channels;
	int frequency;

	bool operator==(const Format & him) const;
	};

	int byteSize(const Format & what);
	int encodingBytes(Encoding what);

	Format input, output;
	double sizeRatio;
	char * buffer;
	int bufferSize;
	};

	}

	#endif