www.pudn.com > AVS_M_ver10.rar > c_stereo_x.c

/* 
*********************************************************************** 
* COPYRIGHT AND WARRANTY INFORMATION 
* 
* Copyright 2007  Audio Video Coding Standard, Part ¢ú 
* 
* This software module was developed by AVS Audio sub-group 
* 
* DISCLAIMER OF WARRANTY 
* 
* These software programs are available to the users without any 
* license fee or royalty on an "as is" basis. The AVS disclaims 
* any and all warranties, whether express, implied, or statutory, 
* including any implied warranties of merchantability or of fitness 
* for a particular purpose. In no event shall the contributors or  
* the AVS be liable for any incidental, punitive, or consequential 
* damages of any kind whatsoever arising from the use of this program. 
* 
* This disclaimer of warranty extends to the user of this program 
* and user's customers, employees, agents, transferees, successors, 
* and assigns. 
* 
* The AVS does not represent or warrant that the program furnished 
* hereunder are free of infringement of any third-party patents. 
* Commercial implementations of AVS, including shareware, may be 
* subject to royalty fees to patent holders. Information regarding 
* the AVS patent policy is available from the AVS Web site at 
* http://www.avs.org.cn 
* 
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE AVS PATENT POLICY. 
************************************************************************ 
*/ 
 
#include  
#include  
#include  
#include  
#include "../include/amr_plus.h" 
#include "../include/cod_hi_stereo.h" 
#include "../include/cod_tcx_stereo.h" 
/*-----------------------------------------------------------------* 
* Funtion  init_coder_stereo                                      * 
* ~~~~~~~~~~~~~~~~~~~~~~~~~~                                      * 
*   ->Initialization of variables for the stereo coder.           * 
*-----------------------------------------------------------------*/ 
void init_coder_stereo_x(Coder_State_Plus *st) 
{ 
	init_cod_hi_stereo(st); 
	init_tcx_stereo_encoder(st); 
	return; 
} 
/*-----------------------------------------------------------------* 
* Funtion coder_stereo                                            * 
* ~~~~~~~~~~~~~~~~~~~~                                            * 
*   ->Principle stereo coder routine (working at fs=12.8kHz).     * 
*                                                                 * 
* Note: HF band are encoded twice (2 channels) using 0.8kbps BWE. * 
*       Usage of 2xBWE for stereo provide better time domain      * 
*       stereo definition in HF without increasing the bit-rate.  * 
*       Another advantage is that the stereo decoder is limited   * 
*       to the lower band (fs=12.8kHz) and this reduce the        * 
*       overall complexity of the AMR-WB+ codec.  Also, this      * 
*       solution is not dependent of the AMR-WB+ mode where many  * 
*       different sampling frequencies are used (16, 24, 32 kHz). * 
*-----------------------------------------------------------------*/ 
void coder_stereo_x(float speech_hi[],	/* (i)	: Mixed channel, hi	*/ 
					float chan_hi[],		/* (i)	: Right channel, hi	*/ 
					float speech_2k[],	/* (i)	: Mixed channel, lo */ 
					float chan_2k[],		/* (i)	: Right channel, lo	*/ 
					float AqLF[], 
					int brMode, 
					int param[],			/* (o)	: Encoded parameters*/	 
					int fscale, 
					Coder_State_Plus *st)		/* (i/o): Encoder states	*/ 
{	 
    int mod[4]; 
	int i; 
	/* param */ 
	/*-----------------------------------------------------------------* 
	* NPRM_STEREO_HI_X*NB_DIV + 4 (mode) + Rest (TCX)				   * 
	*-----------------------------------------------------------------*/ 
	if (StereoNbits[brMode]-4 > 300) 
	{ 
		st->filt_hi_pmsvq = &filt_hi_pmsvq7; 
		st->gain_hi_pmsvq = &gain_hi_pmsvq5; 
	} 
	else { 
		st->filt_hi_pmsvq = &filt_hi_pmsvq4; 
		st->gain_hi_pmsvq = &gain_hi_pmsvq2; 
	} 
	/* encode the high band */ 
	cod_hi_stereo(speech_hi,chan_hi,AqLF,param,st);  /* 64 echantillon look-ahead */ 
	/* encode the low band */ 
	cod_tcx_stereo(speech_2k,chan_2k,param+4+NPRM_STEREO_HI_X*NB_DIV,brMode,mod,fscale,st); 
	/* transmitt the mode in the parameters buffer*/ 
	for(i=0;i<4;i++){ 
		param[i+NPRM_STEREO_HI_X*NB_DIV] = mod[i]; 
	} 
	return; 
} 
static int unpack4bits_d(int nbits, int *prm, short *ptr) 
{ 
	int i; 
	i=0; 
	while (nbits > 4) 
	{ 
		int2bin(prm[i], 4, ptr); 
		ptr += 4; 
		nbits -= 4; 
		i++; 
	} 
	int2bin(prm[i], nbits, ptr); 
	i++; 
	return(i); 
} 
void enc_prm_stereo_x(int param[],       /* (i) : parameters                       */ 
					  short serial[],    /* (o) : serial bits stream               */ 
					  int nbits_pack,     /* (i) : number of bits per packet of 20ms*/ 
					  int nbits_bwe,	/* (i) : number of BWE bits per 20ms  */ 
					  int brMode 
					  ) 
{ 
	int nbits, *prm; 
	int k,j; 
	short *ptr; 
	int i; 
	int mod[NB_DIV],nbits_AVQ[NB_DIV]; 
	int mode,n_pack; 
	int prm_AVQ[(NBITS_MAX/4)+N_PACK_MAX]; 
	int hf_bits=0; 
      int hiband_mode; 
	/*----------------------------------------------------------* 
	* Set number of bits used for stereo (per packet of 20 ms) * 
	* When stereo is transmitted, the bit ordering is:         * 
	* serial: mode (2bits), core, stereo, 2xBWE(2x16bits)      * 
	*----------------------------------------------------------*/ 
	nbits = (StereoNbits[brMode] + (2*nbits_bwe))/4; 
    hiband_mode = 0; 
    if (StereoNbits[brMode]-4 > 300) { 
		hiband_mode = 1; 
	} 
   /*----------------------------------------------------------* 
	* Encode the high band parameters	 		   * 
	*----------------------------------------------------------*/ 
	for(k=0;k