g729a_lspdec.c

在DSP上实现的G.729优化代码 编译过的 大家快来下载啊

#include "../Common/typedef.h"
#include "../Include/G729A_ld8a.h"
#include "../Include/G729A_basic_op.h"
#include "../Include/G729A_tab_ld8a.h"

static Word16 G729Afreq_prev[G729A_MA_NP][G729A_M];   
static Word16 G729Afreq_prev_reset[G729A_M] = { 
	2339, 4679, 7018, 9358, 11698, 14037, 16377, 18717, 21056, 23396
}; 

static Word16 G729Aprev_ma;                  
static Word16 G729Aprev_lsp[G729A_M];                

void G729ALsp_decw_reset(void)
{
	Word16 i;
	
	for(i=0; i<G729A_MA_NP; i++)
		G729ACopy2( &G729Afreq_prev_reset[0], &G729Afreq_prev[i][0], G729A_M );
	
	G729Aprev_ma = 0;
	
	G729ACopy2( G729Afreq_prev_reset, G729Aprev_lsp, G729A_M);
}

void G729ALsp_iqua_cs(Word16 prm[], Word16 lsp_q[], Word16 erase)
{
	Word16 mode_index;
	Word16 code0;
	Word16 code1;
	Word16 code2;
	Word16 buf[G729A_M];     
	
	if( erase==0 ) 
	{  
		mode_index = G729Ashr_s(prm[0] ,G729A_NC0_B) & (Word16)1;
		code0 = prm[0] & (Word16)(G729A_NC0 - 1);
		code1 = G729Ashr_s(prm[1] ,G729A_NC1_B) & (Word16)(G729A_NC1 - 1);
		code2 = prm[1] & (Word16)(G729A_NC1 - 1);
		
		G729ALsp_get_quant(G729A_lspcb1, G729A_lspcb2, code0, code1, code2,
			G729A_fg[mode_index], G729Afreq_prev, lsp_q, G729A_fg_sum[mode_index]);
		
		G729ACopy2(lsp_q, G729Aprev_lsp, G729A_M);
		G729Aprev_ma = mode_index;
	}
	else 
	{         
		G729ACopy2(G729Aprev_lsp, lsp_q, G729A_M);
		
		G729ALsp_prev_extract(G729Aprev_lsp, buf,
			G729A_fg[G729Aprev_ma], G729Afreq_prev, G729A_fg_sum_inv[G729Aprev_ma]);
		G729ALsp_prev_update(buf, G729Afreq_prev);
	}
	
	return;
}

void G729AD_lsp(Word16 prm[], Word16 lsp_q[], Word16 erase)
{
	Word16 lsf_q[G729A_M];     
	
	
	G729ALsp_iqua_cs(prm, lsf_q, erase);
	
	G729ALsf_lsp2(lsf_q, lsp_q, G729A_M);
	
	return;
}