fir_filt.h
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上传日期:2007-02-02
资源大小:6116k
文件大小:2k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /**********************************************************************
- MPEG-4 Audio VM
- Common module
- This software module was originally developed by
- Bodo Teichmann (FhG)
- and edited by
- in the course of development of the MPEG-2 NBC/MPEG-4 Audio standard
- ISO/IEC 13818-7, 14496-1,2 and 3. This software module is an
- implementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio tools
- as specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC gives
- users of the MPEG-2 NBC/MPEG-4 Audio standards free license to this
- software module or modifications thereof for use in hardware or
- software products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audio
- standards. Those intending to use this software module in hardware or
- software products are advised that this use may infringe existing
- patents. The original developer of this software module and his/her
- company, the subsequent editors and their companies, and ISO/IEC have
- no liability for use of this software module or modifications thereof
- in an implementation. Copyright is not released for non MPEG-2
- NBC/MPEG-4 Audio conforming products. The original developer retains
- full right to use the code for his/her own purpose, assign or donate
- the code to a third party and to inhibit third party from using the
- code for non MPEG-2 NBC/MPEG-4 Audio conforming products. This
- copyright notice must be included in all copies or derivative works.
- Copyright (c) 1997.
- Source file: fir_filt.h
- $Id: fir_filt.h,v 1.2 2002/05/13 15:48:18 mvillari Exp $
- Authors:
- tmn Bodo Teichmann mailto:tmn@iis.fhg.de
- Changes:
- 05-may-98 HP added extern "C"
- **********************************************************************/
- #ifndef _fir_filt_h_
- #define _fir_filt_h_
- typedef struct
- {
- float *memoryPtr;
- int writeIdx;
- int readIdx;
- float *filtPtr;
- int filtLength;
- } FIR_FILT ;
- #ifdef __cplusplus
- extern "C" {
- #endif
- FIR_FILT *initFirLowPass(float stopBand,int taps);
- void firLowPass(float* inBuffer,float *outBuffer,int no, FIR_FILT *filter );
- void subSampl(float * inBuff, float * outBuff,int factor,int *noOfSampl);
- #ifdef __cplusplus
- }
- #endif
- #endif /* _fir_filt_h_ */