core.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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 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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/*
 * Fixed-point sampling rate conversion library
 * Developed by Ken Cooke ([e-mail])
 * May 2003
 *
 * Internal state.
 */

typedef unsigned int uint;

typedef struct state_t {
	int up;
	int dn;
	int nchans;
	int nwing;
	int nhist;
	int nstart;
	int offset;
	uint phasef;
	uint stepf;
	short *histbuf;
	short *filter;
	short *rwing;
	short *lwing;
	short *stepNptr;
	int stepNfwd[3];
	int stepNbak[3];
	short *step1ptr;
	int step1fwd[3];
	int step1bak[3];
	short *(*ResampleCore)(short *, short *, short *, struct state_t *);
} state_t;

/* core functions */
short *RATCoreMono(short *pcmptr, short *pcmend, short *outptr, state_t *s);
short *RATCoreStereo(short *pcmptr, short *pcmend, short *outptr, state_t *s);
short *ARBCoreMono(short *pcmptr, short *pcmend, short *outptr, state_t *s);
short *ARBCoreStereo(short *pcmptr, short *pcmend, short *outptr, state_t *s);