int melp_chn_read(struct melp_param *par, struct melp_param *prev_par)
{
int erase = 0;
int i, bit_cntr;
unsigned int *bit_ptr;
/* Read channel output buffer into bit buffer */
bit_ptr = bit_buffer;
for (i = 0; i < NUM_CH_BITS; i++) {
erase |= unpack_code(&par->chptr,&par->chbit,&bit_buffer[bit_order[i]],
1,CHWORDSIZE,ERASE_MASK);
bit_ptr++;
}
/* Read information from bit buffer */
bit_ptr = bit_buffer;
bit_cntr = 0;
unpack_code(&bit_ptr,&bit_cntr,&par->gain_index[1],5,1,0);
/* Read sync bit */
unpack_code(&bit_ptr,&bit_cntr,&i,1,1,0);
unpack_code(&bit_ptr,&bit_cntr,&par->gain_index[0],3,1,0);
unpack_code(&bit_ptr,&bit_cntr,&par->pitch_index,PIT_BITS,1,0);
unpack_code(&bit_ptr,&bit_cntr,&par->jit_index,1,1,0);
unpack_code(&bit_ptr,&bit_cntr,&par->bpvc_index,
NUM_BANDS-1,1,0);
for (i = 0; i < par->msvq_stages; i++)
unpack_code(&bit_ptr,&bit_cntr,&par->msvq_index[i],
par->msvq_bits[i],1,0);
unpack_code(&bit_ptr,&bit_cntr,&par->fsvq_index[0],
FS_BITS,1,0);
/* Clear unvoiced flag */
par->uv_flag = 0;
erase = fec_decode(par,erase);
/* Decode new frame if no erasures occurred */
if (erase) {
/* Erasure: frame repeat */
/* Save correct values of pointers */
prev_par->chptr = par->chptr;
prev_par->chbit = par->chbit;
*par = *prev_par;
/* Force all subframes to equal last one */
for (i = 0; i < NUM_GAINFR-1; i++) {
par->gain[i] = par->gain[NUM_GAINFR-1];
}
}
else {
/* Decode line spectrum frequencies */
vq_msd2(msvq_cb,&par->lsf[1],(float*)NULL,(float*)NULL,par->msvq_index,
par->msvq_levels,par->msvq_stages,LPC_ORD,0);
i = FS_LEVELS;
if (par->uv_flag)
fill(par->fs_mag,1.,NUM_HARM);
else
{
/* Decode Fourier magnitudes */
vq_msd2(fsvq_cb,par->fs_mag,(float*)NULL,(float*)NULL,
par->fsvq_index,&i,1,NUM_HARM,0);
}
/* Decode gain terms with uniform log quantizer */
q_gain_dec(par->gain, par->gain_index,GN_QLO,GN_QUP,GN_QLEV);
/* Fractional pitch: */
/* Decode logarithmic pitch period */
if (par->uv_flag)
par->pitch = UV_PITCH;
else
{
quant_u_dec(par->pitch_index,&par->pitch,PIT_QLO,PIT_QUP,
PIT_QLEV);
par->pitch = pow(10.0,par->pitch);
}
/* Decode jitter and bandpass voicing */
quant_u_dec(par->jit_index,&par->jitter,0.0,MAX_JITTER,2);
q_bpvc_dec(&par->bpvc[0],&par->bpvc_index,par->uv_flag,
NUM_BANDS);
}
/* Return erase flag */
return(erase);
}
BOOLEAN melp_chn_read(struct quant_param *qpar, struct melp_param *par,
struct melp_param *prev_par, unsigned char chbuf[])
{
register int16_t i;
unsigned char *bit_ptr;
BOOLEAN erase = FALSE;
int16_t index, bit_cntr, dontcare;
/* Read channel output buffer into bit buffer */
bit_ptr = bit_buffer;
qpar->chptr = chbuf;
qpar->chbit = 0;
for (i = 0; i < bitNum24; i++) {
erase |= unpack_code(&(qpar->chptr), &(qpar->chbit), &index, 1,
chwordsize, ERASE_MASK);
bit_buffer[bit_order[i]] = (unsigned char)index;
bit_ptr++;
}
/* Read information from bit buffer */
bit_ptr = bit_buffer;
bit_cntr = 0;
(void)unpack_code(&bit_ptr, &bit_cntr, &qpar->gain_index[1], 5, 1, 0);
/* Read sync bit */
(void)unpack_code(&bit_ptr, &bit_cntr, &dontcare, 1, 1, 0);
(void)unpack_code(&bit_ptr, &bit_cntr, &qpar->gain_index[0], 3, 1, 0);
(void)unpack_code(&bit_ptr, &bit_cntr, &(qpar->pitch_index), PIT_BITS,
1, 0);
(void)unpack_code(&bit_ptr, &bit_cntr, &qpar->jit_index[0], 1, 1, 0);
(void)unpack_code(&bit_ptr, &bit_cntr, &qpar->bpvc_index[0],
NUM_BANDS - 1, 1, 0);
for (i = 0; i < MSVQ_STAGES; i++)
(void)unpack_code(&bit_ptr, &bit_cntr, &(qpar->msvq_index[i]),
msvq_bits[i], 1, 0);
(void)unpack_code(&bit_ptr, &bit_cntr, &qpar->fsvq_index, FS_BITS, 1,
0);
/* Clear unvoiced flag */
qpar->uv_flag[0] = FALSE;
erase = (BOOLEAN) fec_decode(qpar, erase);
/* Decode new frame if no erasures occurred */
if (erase) { /* Erasure: frame repeat */
*par = *prev_par;
/* Force all subframes to equal last one */
fill(par->gain, par->gain[NUM_GAINFR - 1], NUM_GAINFR - 1);
} else {
/* Decode line spectrum frequencies */
vq_msd2(msvq_cb, par->lsf, msvq_cb_mean, qpar->msvq_index,
msvq_levels, MSVQ_STAGES, LPC_ORD, 2);
dontcare = FS_LEVELS;
if (qpar->uv_flag[0])
fill(par->fs_mag, ONE_Q13, NUM_HARM);
else /* Decode Fourier magnitudes */
vq_msd2(fsvq_cb, par->fs_mag, (int16_t *) NULL,
&(qpar->fsvq_index), &dontcare, 1, NUM_HARM, 0);
/* Decode gain terms with uniform log quantizer */
q_gain_dec(par->gain, qpar->gain_index, GN_QLO_Q8, GN_QUP_Q8,
GN_QLEV_M1_Q10, 5);
/* Decode voicing information */
par->uv_flag = qpar->uv_flag[0];
/* Fractional pitch: Decode logarithmic pitch period */
if (qpar->uv_flag[0])
par->pitch = UV_PITCH_Q7;
else {
quant_u_dec(qpar->pitch_index, &par->pitch, PIT_QLO_Q12,
PIT_QUP_Q12, PIT_QLEV_M1_Q8, 7);
par->pitch = pow10_fxp(par->pitch, 7);
}
/* Decode jitter */
/* quant_u_dec(par->jit_index, &par->jitter, 0.0, MAX_JITTER, 2); */
if (qpar->jit_index[0] == 0)
par->jitter = 0;
else
par->jitter = MAX_JITTER_Q15;
/* Decode bandpass voicing */
q_bpvc_dec(par->bpvc, qpar->bpvc_index[0], qpar->uv_flag[0],
NUM_BANDS);
}
/* Return erase flag */
return (erase);
}
