limiter.h
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上传日期:2007-06-06
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- /* ***** 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 ***** */
- /* structure definitions and prototypes for audio limiter */
- #ifndef _LIMITER_H_
- #define _LIMITER_H_
- #ifdef __cplusplus
- extern "C" {
- #endif
- typedef struct LIMSTATE {
- /* settings */
- int samprate;
- int channels;
- int headroom;
- double dbgain;
- /* derived */
- unsigned int threshold;
- int reltc;
- int rmsatktc;
- int rmsreltc;
- int outfract;
- int outshift;
- /* state */
- int idx;
- int peak_z;
- int rms_z;
- int acc1;
- int acc2;
- unsigned int randsave;
- int delay[512];
- /* release tables */
- int peaktab[256];
- int rmstab[256];
- } LIMSTATE;
- LIMSTATE *LimiterInit(int samprate, int channels, int headroom);
- void LimiterFree(LIMSTATE *lim);
- void LimiterProcess(int *pcmbuf, int nsamples, LIMSTATE *lim);
- void LimiterOutput16(int *pcmbuf, short *outbuf, int nsamples, LIMSTATE *lim);
- void LimiterSetGain(double dbgain, LIMSTATE *lim);
- void LimiterSetRelease(double release, LIMSTATE *lim);
- /* delay in sample frames */
- int LimiterGetDelay(LIMSTATE *lim);
- double LimiterGetAtten(LIMSTATE *lim);
- #ifdef __cplusplus
- /*extern "C"*/ }
- #endif
- #endif /* _LIMITER_H_ */