public int speex_encode_native(object state, spx_word16_t[] inner, SpeexBits bits)
{
return (((SpeexMode)state)).enc(state, inner, bits);
}
int speex_decode_native(object state, SpeexBits bits, spx_word16_t[] outer)
{
return (((SpeexMode)state)).dec(state, bits, outer);
}
public void speex_encode_stereo_int(spx_int16_t[] data, int frame_size, SpeexBits bits)
{
int i, tmp;
spx_word32_t e_left=0, e_right=0, e_tot=0;
spx_word32_t balance, e_ratio;
spx_word32_t largest, smallest;
int balance_id;
/* In band marker */
bits.speex_bits_pack(14, 5);
/* Stereo marker */
bits.speex_bits_pack(SPEEX_INBAND_STEREO, 4);
for (i=0;i<frame_size;i++)
{
e_left += SHR32(MULT16_16(data[2*i],data[2*i]),8);
e_right += SHR32(MULT16_16(data[2*i+1],data[2*i+1]),8);
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
e_tot += SHR32(MULT16_16(data[i],data[i]),8);
}
if (e_left > e_right)
{
speex_bits_pack(bits, 0, 1);
largest = e_left;
smallest = e_right;
} else {
speex_bits_pack(bits, 1, 1);
largest = e_right;
smallest = e_left;
}
/* Balance quantization */
balance=(largest+1.0f)/(smallest+1.0f);
balance=4*log(balance);
balance_id=floor(.5+fabs(balance));
if (balance_id>30)
balance_id=31;
speex_bits_pack(bits, balance_id, 5);
/* "coherence" quantisation */
e_ratio = e_tot/(1.0f+e_left+e_right);
tmp=scal_quant(EXTRACT16(e_ratio), e_ratio_quant_bounds, 4);
/*fprintf (stderr, "%d %d %d %d\n", largest, smallest, balance_id, e_ratio);*/
speex_bits_pack(bits, tmp, 2);
}
public int speex_std_stereo_request_handler(SpeexBits bits, object state, object data)
{
RealSpeexStereoState stereo;
spx_word16_t sign=1, dexp;
int tmp;
stereo = (RealSpeexStereoState)data;
if (bits.speex_bits_unpack_unsigned(1))
sign=-1;
dexp = bits.speex_bits_unpack_unsigned(5);
stereo.balance = exp(sign*.25*dexp);
tmp = bits.speex_bits_unpack_unsigned(2);
stereo.e_ratio = e_ratio_quant[tmp];
return 0;
}
public void speex_encode_stereo(float[] data, int frame_size, SpeexBits bits)
{
int i, tmp;
float e_left=0, e_right=0, e_tot=0;
float balance, e_ratio;
for (i=0;i<frame_size;i++)
{
e_left += ((float)data[2*i])*data[2*i];
e_right += ((float)data[2*i+1])*data[2*i+1];
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
e_tot += ((float)data[i])*data[i];
}
balance=(e_left+1)/(e_right+1);
e_ratio = e_tot/(1+e_left+e_right);
/*Quantization*/
bits.speex_bits_pack(14, 5);
bits.speex_bits_pack(SPEEX_INBAND_STEREO, 4);
balance=4*log(balance);
/*Pack sign*/
if (balance>0)
bits.speex_bits_pack(0, 1);
else
bits.speex_bits_pack(1, 1);
balance=floor(.5+Math.Abs(balance));
if (balance>30)
balance=31;
bits.speex_bits_pack((int)balance, 5);
/* FIXME: this is a hack */
tmp=scal_quant(e_ratio*Q15_ONE, e_ratio_quant_bounds, 4);
bits.speex_bits_pack(tmp, 2);
}
