hi
we are trying to decode speech that was encoded on a ds'pic with a NB 8
Kb/sec.
we wrote a simple program using the API speex lib 1.2 beta 3:
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include "speex.h"
#include "speex_bits.h"
using namespace std;
char hex2ascii(char toconv);
#define FRAME_SIZE 160
#define nbBytes 20
int main(int argc, _TCHAR* argv[])
{
int mode = 3;
int i=0,j=0;
char ch=0;
int in=0,temp=0;
char out_ascii[640]={0};
float output[FRAME_SIZE];//the originals 160 words in float
short out[FRAME_SIZE];//the originals 160 words
char cbits[nbBytes];
void *state;//hold the state of the decoder
SpeexMode speex_nb_mode;
SpeexBits bits;
state=decoder_init_func(& speex_nb_mode);//initializing a speex decoder
speex_decoder_ctl(state,SPEEX_SET_MODE,&temp);
speex_bits_init(&bits);
we get the data throw RS232, and convert the decoded (supose to be the
original or close to it) to ASCII, so we can simply play it in MATLAB:
system("mode com1: baud=38400 parity=n data=8 stop=1");//opening the
rs232
FILE* mic=fopen("com1:", "w+" );
FILE *mic1 = fopen("mic.txt" , "wt");
while(1)
{
if (feof( mic ) == 0){
cbits[i]=fgetc(mic);
if(i==20)
{
speex_bits_read_from(&bits, cbits, nbBytes);
i=0;
speex_decode(state, &bits, output);
for (j=0;j<FRAME_SIZE;j++)
{
out[j]=output[j];
out_ascii[j*4]=hex2ascii((out[j] >> 12) & 0x000F);
out_ascii[j*4+1]=hex2ascii((out[j] >> 8) & 0x000F);
out_ascii[j*4+2]=hex2ascii((out[j] >> 4) & 0x000F);
out_ascii[j*4+3]=hex2ascii(out[j] & 0x000F);
}
fputs(out_ascii,mic1);
}
else{
i++;
}
}
fclose( mic );
fclose( mic1 );
return 0;
}
char hex2ascii(char toconv)
{
if (toconv<0x0A)
{
toconv += 0x30;
}
else
{
toconv += 0x37;
}
return (toconv);
}
the program give as an error message:
"*Unhandled exception at 0x1000b65a in new_speex.exe: 0xC0000005: Access
violation reading location 0xccccccfc.*"
we dont undersand why, maybe we are not on the correct NB mode?
we need help!
thanks
shlomo and eitan
EE students in israel
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