MPEG-4音频参考程序.gz_c6000_c语言编程_视频编解码_音频 视频

/*====================================================================*/ /* 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. */ /*====================================================================*/ /*======================================================================*/ /* */ /* SOURCE_FILE: PHI_LPC.C */ /* PACKAGE: WDBxx */ /* COMPONENT: Linear Prediction Subroutines */ /* */ /*======================================================================*/ /*======================================================================*/ /* I N C L U D E S */ /*======================================================================*/ #include <stdio.h> #include <stdlib.h> #include <math.h> #include <malloc.h> #include <float.h> #include <assert.h> #include "buffersHandle.h" /* handler, defines, enums */ #include "bitstream.h" #include "phi_cons.h" #include "phi_priv.h" #include "phi_lpc.h" #include "phi_lpcq.h" #include "phi_lsfr.h" #include "nec_abs_proto.h" #include "pan_celp_const.h" #include "pan_celp_proto.h" #include "att_proto.h" #include "nec_abs_const.h" #include "nec_lspnw20.tbl" #define NEC_PAI 3.141592 #define NEC_LSPPRDCT_ORDER 4 #define NEC_NUM_LSPSPLIT1 2 #define NEC_NUM_LSPSPLIT2 4 #define NEC_QLSP_CAND 2 #define NEC_LSP_MINWIDTH_FRQ16 0.028 #define NEC_MAX_LSPVQ_ORDER 20 #define DEBUG_YM /* flag for halting LPC analysis : '98/11/27 */ /*======================================================================*/ /* L O C A L F U N C T I O N S P R O T O T Y P E S */ /*======================================================================*/ /*======================================================================*/ /* Modified Panasonic/NEC functions */ /*======================================================================*/ static void mod_nec_lsp_sort( float x[], long order , PHI_PRIV_TYPE *PHI_Priv); /*======================================================================*/ static void mod_nec_psvq( float *, float *, float *, long, long, float *, long *, long ); /*======================================================================*/ static void mod_nb_abs_lsp_quantizer ( float current_lsp[], /* in: current LSP to be quantized */ float previous_Qlsp[], /* In: previous Quantised LSP */ float current_Qlsp[], /* out: quantized LSP */ long lpc_indices[], /* out: LPC code indices */ long lpc_order, /* in: order of LPC */ long num_lpc_indices, /* in: number of LPC indices */ long n_lpc_analysis /* in: number of LP analysis per frame */ ); /*======================================================================*/ static void mod_nec_bws_lsp_quantizer( float lsp[], /* input */ float qlsp8[], /* input */ float qlsp[], /* output */ long indices[], /* output */ long lpc_order, /* configuration input */ long lpc_order_8, /* configuration input */ long num_lpc_indices, /* configuration input */ float blsp[NEC_LSPPRDCT_ORDER][NEC_MAX_LSPVQ_ORDER], PHI_PRIV_TYPE *PHI_Priv /* In/Out: PHI private data (instance context) */ ); /*======================================================================*/ static void mod_nb_abs_lsp_decode( unsigned long lpc_indices[], /* in: LPC code indices */ float prev_Qlsp[], /* in: previous LSP vector */ float current_Qlsp[], /* out: quantized LSP vector */ long lpc_order, /* in: order of LPC */ long num_lpc_indices /* in: number of LPC indices */ ); /*======================================================================*/ static void mod_nec_bws_lsp_decoder( unsigned long indices[], /* input */ float qlsp8[], /* input */ float qlsp[], /* output */ long lpc_order, /* configuration input */ long lpc_order_8, /* configuration input */ long num_lpc_indices, /* configuration input */ float blsp[NEC_LSPPRDCT_ORDER][NEC_MAX_LSPVQ_ORDER], PHI_PRIV_TYPE *PHI_Priv /* In/Out: PHI private data (instance context) */ ); /*======================================================================*/ static void mod_wb_celp_lsp_quantizer ( float current_lsp[], /* in: current LSP to be quantized */ float previous_Qlsp[], /* In: previous Quantised LSP */ float current_Qlsp[], /* out: quantized LSP */ long lpc_indices[], /* out: LPC code indices */ long lpc_order, /* in: order of LPC */ long num_lpc_indices, /* in: number of LPC indices */ long n_lpc_analysis /* in: number of LP analysis per frame */ ); /*======================================================================*/ static void mod_wb_celp_lsp_decode( unsigned long lpc_indices[], /* in: LPC code indices */ float prev_Qlsp[], /* in: previous LSP vector */ float current_Qlsp[], /* out: quantized LSP vector */ long lpc_order, /* in: order of LPC */ long num_lpc_indices /* in: number of LPC indices */ ); /*======================================================================*/ /* Function Prototype: PHI_Apar2Rfc */ /*======================================================================*/ static void PHI_Apar2Rfc ( int P, /* In: LPC Order */ float ap[], /* In: Polynomial coefficients [0..P-1] */ float rfc[] /* Out: Reflection coefficients [0..P-1] */ ); /*======================================================================*/ /* Function Prototype: PHI_Rfc2Apar */ /*======================================================================*/ static void PHI_Rfc2Apar ( int P, /* In: LPC Order */ float rq[], /* In: Reflection coefficients [0..P-1] */ float aq[] /* Out: a-parameters [0..P-1] */ ); 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