void codec2_decode_1200(struct CODEC2 *c2, short speech[], const unsigned char * bits)
{
MODEL model[4];
int lsp_indexes[LPC_ORD];
float lsps[4][LPC_ORD];
int WoE_index;
float e[4];
float snr;
float ak[4][LPC_ORD+1];
int i,j;
unsigned int nbit = 0;
float weight;
assert(c2 != NULL);
/* only need to zero these out due to (unused) snr calculation */
for(i=0; i<4; i++)
for(j=1; j<=MAX_AMP; j++)
model[i].A[j] = 0.0;
/* unpack bits from channel ------------------------------------*/
/* this will partially fill the model params for the 4 x 10ms
frames */
model[0].voiced = unpack(bits, &nbit, 1);
model[1].voiced = unpack(bits, &nbit, 1);
WoE_index = unpack(bits, &nbit, WO_E_BITS);
decode_WoE(&model[1], &e[1], c2->xq_dec, WoE_index);
model[2].voiced = unpack(bits, &nbit, 1);
model[3].voiced = unpack(bits, &nbit, 1);
WoE_index = unpack(bits, &nbit, WO_E_BITS);
decode_WoE(&model[3], &e[3], c2->xq_dec, WoE_index);
for(i=0; i<LSP_PRED_VQ_INDEXES; i++) {
lsp_indexes[i] = unpack(bits, &nbit, lsp_pred_vq_bits(i));
}
decode_lsps_vq(lsp_indexes, &lsps[3][0], LPC_ORD);
check_lsp_order(&lsps[3][0], LPC_ORD);
bw_expand_lsps(&lsps[3][0], LPC_ORD);
/* interpolate ------------------------------------------------*/
/* Wo and energy are sampled every 20ms, so we interpolate just 1
10ms frame between 20ms samples */
interp_Wo(&model[0], &c2->prev_model_dec, &model[1]);
e[0] = interp_energy(c2->prev_e_dec, e[1]);
interp_Wo(&model[2], &model[1], &model[3]);
e[2] = interp_energy(e[1], e[3]);
/* LSPs are sampled every 40ms so we interpolate the 3 frames in
between, then recover spectral amplitudes */
for(i=0, weight=0.25; i<3; i++, weight += 0.25) {
interpolate_lsp_ver2(&lsps[i][0], c2->prev_lsps_dec, &lsps[3][0], weight);
}
for(i=0; i<4; i++) {
lsp_to_lpc(&lsps[i][0], &ak[i][0], LPC_ORD);
aks_to_M2(c2->fft_fwd_cfg, &ak[i][0], LPC_ORD, &model[i], e[i], &snr, 0, 0,
c2->lpc_pf, c2->bass_boost, c2->beta, c2->gamma);
apply_lpc_correction(&model[i]);
}
/* synthesise ------------------------------------------------*/
for(i=0; i<4; i++)
synthesise_one_frame(c2, &speech[N*i], &model[i], &ak[i][0]);
/* update memories for next frame ----------------------------*/
c2->prev_model_dec = model[3];
c2->prev_e_dec = e[3];
for(i=0; i<LPC_ORD; i++)
c2->prev_lsps_dec[i] = lsps[3][i];
}
void codec2_decode_1300(struct CODEC2 *c2, short speech[], const unsigned char * bits, float ber_est)
{
MODEL model[4];
int lsp_indexes[LPC_ORD];
float lsps[4][LPC_ORD];
int Wo_index, e_index;
float e[4];
float snr;
float ak[4][LPC_ORD+1];
int i,j;
unsigned int nbit = 0;
float weight;
COMP Aw[FFT_ENC];
PROFILE_VAR(recover_start);
assert(c2 != NULL);
/* only need to zero these out due to (unused) snr calculation */
for(i=0; i<4; i++)
for(j=1; j<=MAX_AMP; j++)
model[i].A[j] = 0.0;
/* unpack bits from channel ------------------------------------*/
/* this will partially fill the model params for the 4 x 10ms
frames */
model[0].voiced = unpack_natural_or_gray(bits, &nbit, 1, c2->gray);
model[1].voiced = unpack_natural_or_gray(bits, &nbit, 1, c2->gray);
model[2].voiced = unpack_natural_or_gray(bits, &nbit, 1, c2->gray);
model[3].voiced = unpack_natural_or_gray(bits, &nbit, 1, c2->gray);
Wo_index = unpack_natural_or_gray(bits, &nbit, WO_BITS, c2->gray);
model[3].Wo = decode_Wo(Wo_index);
model[3].L = PI/model[3].Wo;
e_index = unpack_natural_or_gray(bits, &nbit, E_BITS, c2->gray);
e[3] = decode_energy(e_index);
for(i=0; i<LSP_SCALAR_INDEXES; i++) {
lsp_indexes[i] = unpack_natural_or_gray(bits, &nbit, lsp_bits(i), c2->gray);
}
decode_lsps_scalar(&lsps[3][0], lsp_indexes, LPC_ORD);
check_lsp_order(&lsps[3][0], LPC_ORD);
bw_expand_lsps(&lsps[3][0], LPC_ORD, 50.0, 100.0);
if (ber_est > 0.15) {
model[0].voiced = model[1].voiced = model[2].voiced = model[3].voiced = 0;
e[3] = decode_energy(10);
bw_expand_lsps(&lsps[3][0], LPC_ORD, 200.0, 200.0);
fprintf(stderr, "soft mute\n");
}
/* interpolate ------------------------------------------------*/
/* Wo, energy, and LSPs are sampled every 40ms so we interpolate
the 3 frames in between */
PROFILE_SAMPLE(recover_start);
for(i=0, weight=0.25; i<3; i++, weight += 0.25) {
interpolate_lsp_ver2(&lsps[i][0], c2->prev_lsps_dec, &lsps[3][0], weight);
interp_Wo2(&model[i], &c2->prev_model_dec, &model[3], weight);
e[i] = interp_energy2(c2->prev_e_dec, e[3],weight);
}
/* then recover spectral amplitudes */
for(i=0; i<4; i++) {
lsp_to_lpc(&lsps[i][0], &ak[i][0], LPC_ORD);
aks_to_M2(c2->fft_fwd_cfg, &ak[i][0], LPC_ORD, &model[i], e[i], &snr, 0, 0,
c2->lpc_pf, c2->bass_boost, c2->beta, c2->gamma, Aw);
apply_lpc_correction(&model[i]);
synthesise_one_frame(c2, &speech[N*i], &model[i], Aw);
}
PROFILE_SAMPLE_AND_LOG2(recover_start, " recover");
#ifdef DUMP
dump_lsp_(&lsps[3][0]);
dump_ak_(&ak[3][0], LPC_ORD);
#endif
/* update memories for next frame ----------------------------*/
c2->prev_model_dec = model[3];
c2->prev_e_dec = e[3];
for(i=0; i<LPC_ORD; i++)
c2->prev_lsps_dec[i] = lsps[3][i];
}
void codec2_decode_3200(struct CODEC2 *c2, short speech[], const unsigned char * bits)
{
MODEL model[2];
int lspd_indexes[LPC_ORD];
float lsps[2][LPC_ORD];
int Wo_index, e_index;
float e[2];
float snr;
float ak[2][LPC_ORD+1];
int i,j;
unsigned int nbit = 0;
assert(c2 != NULL);
/* only need to zero these out due to (unused) snr calculation */
for(i=0; i<2; i++)
for(j=1; j<=MAX_AMP; j++)
model[i].A[j] = 0.0;
/* unpack bits from channel ------------------------------------*/
/* this will partially fill the model params for the 2 x 10ms
frames */
model[0].voiced = unpack(bits, &nbit, 1);
model[1].voiced = unpack(bits, &nbit, 1);
Wo_index = unpack(bits, &nbit, WO_BITS);
model[1].Wo = decode_Wo(Wo_index);
model[1].L = PI/model[1].Wo;
e_index = unpack(bits, &nbit, E_BITS);
e[1] = decode_energy(e_index);
for(i=0; i<LSPD_SCALAR_INDEXES; i++) {
lspd_indexes[i] = unpack(bits, &nbit, lspd_bits(i));
}
decode_lspds_scalar(&lsps[1][0], lspd_indexes, LPC_ORD);
/* interpolate ------------------------------------------------*/
/* Wo and energy are sampled every 20ms, so we interpolate just 1
10ms frame between 20ms samples */
interp_Wo(&model[0], &c2->prev_model_dec, &model[1]);
e[0] = interp_energy(c2->prev_e_dec, e[1]);
/* LSPs are sampled every 20ms so we interpolate the frame in
between, then recover spectral amplitudes */
interpolate_lsp_ver2(&lsps[0][0], c2->prev_lsps_dec, &lsps[1][0], 0.5);
for(i=0; i<2; i++) {
lsp_to_lpc(&lsps[i][0], &ak[i][0], LPC_ORD);
aks_to_M2(c2->fft_fwd_cfg, &ak[i][0], LPC_ORD, &model[i], e[i], &snr, 0, 0,
c2->lpc_pf, c2->bass_boost, c2->beta, c2->gamma);
apply_lpc_correction(&model[i]);
}
/* synthesise ------------------------------------------------*/
for(i=0; i<2; i++)
synthesise_one_frame(c2, &speech[N*i], &model[i], &ak[i][0]);
/* update memories for next frame ----------------------------*/
c2->prev_model_dec = model[1];
c2->prev_e_dec = e[1];
for(i=0; i<LPC_ORD; i++)
c2->prev_lsps_dec[i] = lsps[1][i];
}
void codec2_decode(void *codec2_state, short speech[],
const unsigned char * bits)
{
CODEC2 *c2;
MODEL model;
int voiced1, voiced2;
int lsp_indexes[LPC_ORD];
float lsps[LPC_ORD];
int energy_index;
float energy;
int Wo_index;
float ak[LPC_ORD+1];
float ak_interp[LPC_ORD+1];
int i;
unsigned int nbit = 0;
MODEL model_interp;
assert(codec2_state != NULL);
c2 = (CODEC2*)codec2_state;
/* unpack bit stream to integer codes */
Wo_index = unpack(bits, &nbit, WO_BITS);
for(i=0; i<LPC_ORD; i++) {
lsp_indexes[i] = unpack(bits, &nbit, lsp_bits(i));
}
energy_index = unpack(bits, &nbit, E_BITS);
voiced1 = unpack(bits, &nbit, 1);
voiced2 = unpack(bits, &nbit, 1);
assert(nbit == CODEC2_BITS_PER_FRAME);
/* decode integer codes to model parameters */
model.Wo = decode_Wo(Wo_index);
model.L = PI/model.Wo;
memset(&model.A, 0, (model.L+1)*sizeof(model.A[0]));
decode_amplitudes(&model,
ak,
lsp_indexes,
energy_index,
lsps,
&energy);
model.voiced = voiced2;
model_interp.voiced = voiced1;
model_interp.Wo = P_MAX/2;
memset(&model_interp.A, 0, MAX_AMP*sizeof(model_interp.A[0]));
/* interpolate middle frame's model parameters for adjacent frames */
interpolate_lsp(&model_interp, &c2->prev_model, &model,
c2->prev_lsps, c2->prev_energy, lsps, energy, ak_interp);
apply_lpc_correction(&model_interp);
/* synthesis two 10ms frames */
synthesise_one_frame(c2, speech, &model_interp, ak_interp);
synthesise_one_frame(c2, &speech[N], &model, ak);
/* update memories (decode states) for next time */
memcpy(&c2->prev_model, &model, sizeof(MODEL));
memcpy(c2->prev_lsps, lsps, sizeof(lsps));
c2->prev_energy = energy;
}
