rafixptresampler.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

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#ifndef _RAFIXPTRESAMPLER_H_
#define _RAFIXPTRESAMPLER_H_

#include "hxresult.h"
#include "hxassert.h"
#include "../../fixptresampler/resample.h"

class RAExactResampler
{
public:
    // resampler quality
    enum Quality {
        KResampleQualityVeryLow  = 0, 
        KResampleQualityLow      = 1, 
        KResampleQualityMedium   = 2, 
        KResampleQualityHigh     = 3 
    };

    // input data type
    enum {
        _INT16 = 0,
        _INT32 = 1,
        _FLOAT = 2
    };

    // Create a resampler with a given quality level.
    static HX_RESULT Create(RAExactResampler** pRes,
			    int inrate, int outrate,
			    int chans, int intype,
			    Quality quality = KResampleQualityLow) ;

    ~RAExactResampler();

    /*
     * insamps is the number of samples (not sample frames) you are
     * handing the resampler.  Note that in the case of stereo, this
     * must be divisible by two.
     */
    int Resample(void *inbuf, int insamps, signed short *outbuf);
    int Resample(void *inbuf, int insamps, signed int *outbuf);
    /*
     * The maximum output, in samples, that could be produced by
     * insamps input samples.
     */
    int GetMaxOutput(int insamps);
    /*
     * The minimum input, in samples, that will produce at least
     * outsamps output samples.
     */
    int GetMinInput(int outsamps);
    /*
     * The delay of this filter, in frames of output samples.
     */
    int GetDelay();

protected:
    RAExactResampler(); // make this protected -- use the Create() function!
    
private:
    void* m_pInst;
};

inline int
RAExactResampler::Resample(void *inbuf, int insamps, signed int *outbuf)
{
    HX_ASSERT(0 /* this resampler does not support 32 bit samples */);
    return 0;
}

inline int
RAExactResampler::Resample(void *inbuf, int insamps, signed short *outbuf)
{
    HX_ASSERT(m_pInst);
    return ::Resample((short*)inbuf, insamps, (short*)outbuf, m_pInst);
}

#endif // _RAFIXPTRESAMPLER_H_