phi_apre.h
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上传日期:2007-02-02
资源大小:6116k
文件大小:5k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*====================================================================*/
- /* MPEG-4 Audio (ISO/IEC 14496-3) Copyright Header */
- /*====================================================================*/
- /*
- This software module was originally developed by Rakesh Taori and Andy
- Gerrits (Philips Research Laboratories, Eindhoven, The Netherlands) in
- the course of development of the MPEG-4 Audio (ISO/IEC 14496-3). This
- software module is an implementation of a part of one or more MPEG-4
- Audio (ISO/IEC 14496-3) tools as specified by the MPEG-4 Audio
- (ISO/IEC 14496-3). ISO/IEC gives users of the MPEG-4 Audio (ISO/IEC
- 14496-3) free license to this software module or modifications thereof
- for use in hardware or software products claiming conformance to the
- MPEG-4 Audio (ISO/IEC 14496-3). Those intending to use this software
- module in hardware or software products are advised that its 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-4 Audio (ISO/IEC 14496-3) conforming products.
- CN1 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 parties from
- using the code for non MPEG-4 Audio (ISO/IEC 14496-3) conforming
- products. This copyright notice must be included in all copies or
- derivative works. Copyright 1996.
- */
- /*====================================================================*/
- /*======================================================================*/
- /* */
- /* INCLUDE_FILE: PHI_APRE.H */
- /* PACKAGE: WDBxx */
- /* COMPONENT: Adaptive Codebook Preselection Module */
- /* */
- /*======================================================================*/
- #ifndef _phi_apre_h_
- #define _phi_apre_h_
- #ifdef __cplusplus
- extern "C" {
- #endif
- /*======================================================================*/
- /* Function Prototype: PHI_allocate_energy_table */
- /*======================================================================*/
- void PHI_allocate_energy_table
- (
- const long sbfrm_size, /* In: Subframe size in samples */
- const long acbk_size, /* In: Length of Adaptive Codebook */
- const long sac_search_step /* In: Try every $1-th sample */
- );
- /*======================================================================*/
- /* Function Prototype: PHI_cba_preselection */
- /*======================================================================*/
- void PHI_cba_preselection
- (
- const long nos, /* In: Number of samples to be processed */
- const long max_lag, /* In: Maximum Permitted Adapt cbk Lag */
- const long min_lag, /* In: Minimum Permitted Adapt cbk Lag */
- const long n_sbfrm_frm, /* In: Number of subframes in a frame */
- const long n_lags, /* In: Number of lag candidates */
- const float ca[], /* In: Segment from adaptive codebook */
- const float ta[], /* In: Backward filtered target signal */
- const float a, /* In: Lpc Coefficients (weighted) */
- long pi[], /* Out: Result preselection: Lag candidates */
- const long n /* In: Subframe Counter (we need this) */
- /* For explanation :see philips proposal*/
- );
- /*======================================================================*/
- /* Function Prototype: PHI_free_energy_table */
- /*======================================================================*/
- void
- PHI_free_energy_table
- (
- const long sbfrm_size, /* In: Subframe size in samples */
- const long acbk_size /* In: Length of Adaptive Codebook */
- );
- #ifdef __cplusplus
- }
- #endif
- #endif /* #ifndef _phi_apre_h_ */
- /*======================================================================*/
- /* H I S T O R Y */
- /*======================================================================*/
- /* 17-04-96 R. Taori Initial Version */