allresamplers.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 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#ifndef _ALLRESAMPLERS_H_
#define _ALLRESAMPLERS_H_

#ifdef __cplusplus
extern "C" {
#endif

struct CVTSTATEMACHINE {
  struct CVTSTATEMACHINE *pNext ;
  int incInput, incOutput ;
} ;

typedef int (* cvtFunctionType)(void* dst, const void* src, int n, const struct CVTSTATEMACHINE *pState);

typedef struct
{
  cvtFunctionType pfCvt ;
  struct CVTSTATEMACHINE *pStateMachine ;
} tConverter ;

#define NBLOCK 2058

#define MONO	1
#define STEREO	2

#ifndef MAX
#define MAX(a,b) (((b) > (a)) ? (b) : (a))
#endif
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif

/* defaults */

#define DEF_ATTEN 90.0f

#define DEF_PASSBAND 0.88f
#define DEF_STOPBAND 1.0f
#define DEF_DCGAIN 1.0f

/*
 * Compute greatest common divisor.
 */
static int
gcd(int a, int b)
{
  while (a != b) {
      if (a > b)
        a -= b;
      else
        b -= a;
  }
  return a;
}

/* float to short, with rounding and clipping */
static
#if !defined(_AIX) && !defined(_SOLARIS) && !defined(_HPUX) && !defined(_OSF1)
__inline
#endif
short
RoundFtoS(float f) {
	long l;
#if defined(_M_IX86)
	__asm fld	f
	__asm fistp	l
#elif defined(__GNUC__) && defined(__i386__)
	__asm__ __volatile ("fistl %0" : "=m" (l) : "t" (f)) ;
#else
	l = (long)(f < 0.0f ? f - 0.5f : f + 0.5f);
#endif
	if (l > 32767) l = 32767;
	else if (l < -32768) l = -32768;
	return(short)l;
}

#ifndef _AIX
typedef unsigned char uchar;
#if !defined(_HPUX) && !defined(_LINUX) && !defined(_MAC_MACHO)
typedef unsigned int uint;
#endif
#endif

// Rational

void *
RAInitResamplerRat(int inrate, int outrate, int chans, float atten, float passband, float stopband, float dcgain);
void *
RAInitResamplerCopyRat(int nchans, const void *inst);
void
RAFreeResamplerRat(void *inst);

int
RAResampleMonoRat(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;
int
RAResampleStereoRat(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;

int
RAGetMaxOutputRat(int insamps, void *inst);
int
RAGetMinInputRat(int outsamps, void *inst);
int
RAGetDelayRat(void *inst);

// Arbitrary

void *
RAInitResamplerArb(int inrate, int outrate, int chans, float atten, float passband, float stopband, float dcgain);
void *
RAInitResamplerCopyArb(int nchans, const void *inst);
void
RAFreeResamplerArb(void *inst);

int
RAResampleMonoArb(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;
int
RAResampleStereoArb(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;

int
RAGetMaxOutputArb(int insamps, void *inst);
int
RAGetMinInputArb(int outsamps, void *inst);
int
RAGetDelayArb(void *inst);

// MMX resamplers

void *
RAInitResamplerMMX(int inrate, int outrate, int chans);
void *
RAInitResamplerCopyMMX(int nchans, const void *inst);
void
RAFreeResamplerMMX(void *inst);

int
RAResampleMonoMMX(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;
int
RAResampleStereoMMX(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst) ;

int
RAGetMaxOutputMMX(int insamps, void *inst);
int
RAGetMinInputMMX(int outsamps, void *inst);
int
RAGetDelayMMX(void *inst);


// Hermite interpolation

void *
RAInitResamplerHermite(int inrate, int outrate, int chans);
void *
RAInitResamplerCopyHermite(int nchans, const void *inst);
void
RAFreeResamplerHermite(void *inst);

int
RAResampleMonoHermite(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst);
int
RAResampleStereoHermite(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst);

int
RAGetMaxOutputHermite(int insamps, void *inst);
int
RAGetMinInputHermite(int outsamps, void *inst);
int
RAGetDelayHermite(void *inst);

#ifdef __cplusplus
}
#endif

#endif /* _ALLRESAMPLERS_H_ */