xfade.h

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

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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#ifndef _XFADE_H_
#define _XFADE_H_

#include "hxtypes.h"

#ifdef __cplusplus
extern "C" {
#endif

/* 32 bit crossfader */

typedef struct XFADER_STATE XFADER_STATE ;
struct COEFF { INT32 gain,delta ; } ;

XFADER_STATE* XFader_init(int sampleRate, int nChannels, const struct COEFF* coeff) ;
void XFader_start(int nSamples, XFADER_STATE* instance) ;
void XFader_free(XFADER_STATE* instance) ;
int XFader_active(XFADER_STATE* instance) ;
int XFader_feed(const INT32* in, INT32* inout, int nSamples, XFADER_STATE* instance) ;
int Fader_feed(INT32 *inout, int nSamples, int fadeout, XFADER_STATE* instance) ;
struct COEFF *sintab(void) ;

extern const struct COEFF XFader_sin2tab[2*257] ;

#ifdef __cplusplus
}
#endif

#endif /* _XFADE_H_ */