/*
 * 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