haiku.git

/*
 * Copyright 2000-2006 Ingo Weinhold <ingo_weinhold@gmx.de>
 * All rights reserved. Distributed under the terms of the MIT licensce.
 */
#ifndef AUDIO_RESAMPLER_H
#define AUDIO_RESAMPLER_H


/*! This AudioReader does both resampling an audio source to a different
	sample rate and rescaling the time, e.g. it is possible to convert the
	source data from 41.1 KHz to 96 KHz played backward twice as fast
	(time scale = -2).
*/


#include "AudioReader.h"


class AudioResampler : public AudioReader {
public:
								AudioResampler();
								AudioResampler(AudioReader* source,
									float frameRate, float timeScale = 1.0);
	virtual						~AudioResampler();

	virtual bigtime_t			InitialLatency() const;
	virtual	status_t			Read(void* buffer, int64 pos, int64 frames);

	virtual	status_t			InitCheck() const;

			void				SetSource(AudioReader* source);
			void				SetFrameRate(float frameRate);
			void				SetTimeScale(float timeScale);

			AudioReader*		Source() const;
			float				FrameRate() const;
			float				TimeScale() const;

			void				SetInOffset(int64 offset);
			int64				InOffset() const;

			int64				ConvertFromSource(int64 pos) const;
			int64				ConvertToSource(int64 pos) const;

private:
			status_t			_ReadLinear(void* buffer, int64 pos,
									int64 frames);

private:
			AudioReader*		fSource;
			float				fTimeScale;	// speed
			int64				fInOffset;
};

#endif	// AUDIO_RESAMPLER_H