Nothing but rhythm was left after encoding and decoding by speex on ipad(XCode 4.1 48110)

hi,

I tried to encode the voice data read from AudioQueue and then decode
it. There was nothing but rhythm left, it sounds like robot's voice,
but I cannot recognize any word.

The app was compiled by XCode 4.1. Speex 1.0.5 and 1.2.rc1 gave the
same result. When compiling speex 1.0.5, I  added them to Xcode
project, set the Header Search Paths, then compiled successfully. When
compiling speex 1.2.rc1, I included the config.h file generated by the
configure on Mac OS X 10.7.1（add "#include config.h" in arch.h) and
did the same thing with that on speex 1.0.5.

The following is the code I used to encode and decode, it works
properly in Android 3.0:

static int speexo_encode(const void *in_bytes, void *out_bytes, int size)
{
	if (!codec_open)
		return 0;

	int return_value;

	speex_bits_reset(&ebits);
	
	//speex_echo_capture(echo_state, (short*)in_bytes, (short*)in_bytes);
	
	//speex_preprocess_run(prep_state, (short*)in_bytes);
	
	speex_encode_int(enc_state, (short*)in_bytes, &ebits);
	if(speex_bits_nbytes(&ebits) >= (int)size) {
		return_value = 0;
	}
	else {
		return_value = (int)speex_bits_write(&ebits, (char*)out_bytes, size);
	}
	
	return return_value;
}

static int speexo_decode(const void *in_bytes, int in_len, void *out_bytes)
{
	if (!codec_open)
		return 0;

	int return_value;

	speex_bits_reset(&dbits);
	speex_bits_read_from(&dbits, (char *)in_bytes, in_len);
	if (0 != speex_decode_int(dec_state, &dbits, (short*)out_bytes)) {
		return_value = 0;
	}
	else {
		return_value = dec_frame_size*2;
	}

	return return_value;
}

Please give your suggestion, thanks.
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