www.pudn.com > TalkG726.rar > g726.c

#include "stdio.h" 
#include "memory.h" 
#include "g72x.h" 
 
extern void g726_Encode(unsigned char *speech,char *bitstream) 
{ 
	g726_state state_ptr; 
	short temp[480]; 
	int i; 
	//char c; 
 
	g726_init_state(&state_ptr); 
	/*for(i=0;i<480;i++) 
	{ 
		c=*(speech+i*2); 
		*(speech+i*2)=*(speech+i*2+1); 
		*(speech+i*2+1)=c; 
	}*/ 
	memcpy(temp,speech,960); 
	 
	for(i=0;i<120;i++) 
	{ 
		*(bitstream+i)=(((char)(g726_16_encoder(temp[i*4],AUDIO_ENCODING_LINEAR,&state_ptr)))<<6)|(((char)(g726_16_encoder(temp[i*4+1],AUDIO_ENCODING_LINEAR,&state_ptr)))<<4)|(((char)(g726_16_encoder(temp[i*4+2],AUDIO_ENCODING_LINEAR,&state_ptr)))<<2)|(((char)(g726_16_encoder(temp[i*4+3],AUDIO_ENCODING_LINEAR,&state_ptr)))); 
	} 
} 
 
extern void g726_Decode(char *bitstream,unsigned char *speech) 
{ 
	g726_state state_ptr; 
	int i; 
	int in; 
	short temp; 
 
	g726_init_state(&state_ptr); 
	 
	for(i=0;i<120;i++) 
	{ 
		in=(int)(((*(bitstream+i))&(char)192)>>6); 
		temp=g726_16_decoder(in,AUDIO_ENCODING_LINEAR,&state_ptr); 
		memcpy(speech+i*8,&temp,2); 
		in=(int)(((*(bitstream+i))&(char)48)>>4); 
		temp=g726_16_decoder(in,AUDIO_ENCODING_LINEAR,&state_ptr); 
		memcpy(speech+i*8+2,&temp,2); 
		in=(int)(((*(bitstream+i))&(char)12)>>2); 
		temp=g726_16_decoder(in,AUDIO_ENCODING_LINEAR,&state_ptr); 
		memcpy(speech+i*8+4,&temp,2); 
		in=(int)(((*(bitstream+i))&(char)3)); 
		temp=g726_16_decoder(in,AUDIO_ENCODING_LINEAR,&state_ptr); 
		memcpy(speech+i*8+6,&temp,2); 
	} 
}