[Speex-dev] decode problem

[Stefano Falasca]

Hi 

I am using first time speex library, and this is my first problem. I need to
decode AMR-NB packet to PCM. I read all manual instruction and I wrote these
simple lines of code.

 

bool CMMediaObj::AmrInit()

{

            speex_bits_init(&bits);

            destate = speex_decoder_init(&speex_nb_mode);

            int tmp=1;

            speex_decoder_ctl(destate, SPEEX_SET_ENH, &tmp);

            return true;

}

void CMMediaObj::AmrFreeMemory()

{

            if (destate){

                        speex_bits_destroy(&bits);

                        speex_decoder_destroy(destate);

            }

}

#define FRAME_SIZE 320

int CMMediaObj::AmrDecodeOneFrame(char *src,char *dst) 

{

            speex_bits_read_from(&bits, src, 14);

            speex_decode_int(destate, &bits, (short*)dst);

            return FRAME_SIZE;

}

 

My problem is that I hear only strange sound. I receive packet of 14 bytes
for each frame and I call AmrDecodeOneFrame for each frame. Then 14 bytes
amr packet should be 320 bytes uncompress data. speex_decode_int return 0
then good result.

Where is the problem ????

 

Thanks

Stefano

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