ref: 94c7cb322517928839dde6a263783b773e2629c3
dir: /amr-wb/qpisf_2s.c/
/*-------------------------------------------------------------------*
* QPISF_2S.C *
*-------------------------------------------------------------------*
* Coding/Decoding of ISF parameters with prediction. *
* *
* The ISF vector is quantized using two-stage VQ with split-by-2 *
* in 1st stage and split-by-5 (or 3)in the second stage. *
*-------------------------------------------------------------------*/
#include "typedef.h"
#include "basic_op.h"
#include "cnst.h"
#include "acelp.h"
#include "count.h"
#include "qpisf_2s.tab" /* Codebooks of isfs */
#define MU 10923 /* Prediction factor (1.0/3.0) in Q15 */
#define N_SURV_MAX 4 /* 4 survivors max */
#define ALPHA 29491 /* 0. 9 in Q15 */
#define ONE_ALPHA (32768-ALPHA) /* (1.0 - ALPHA) in Q15 */
/* local functions */
static void VQ_stage1(
Word16 * x, /* input : ISF residual vector */
Word16 * dico, /* input : quantization codebook */
Word16 dim, /* input : dimention of vector */
Word16 dico_size, /* input : size of quantization codebook */
Word16 * index, /* output: indices of survivors */
Word16 surv /* input : number of survivor */
);
/*-------------------------------------------------------------------*
* Function Qpisf_2s_46B() *
* ~~~~~~~~~ *
* Quantization of isf parameters with prediction. (46 bits) *
* *
* The isf vector is quantized using two-stage VQ with split-by-2 in *
* 1st stage and split-by-5 in the second stage. *
*-------------------------------------------------------------------*/
void Qpisf_2s_46b(
Word16 * isf1, /* (i) Q15 : ISF in the frequency domain (0..0.5) */
Word16 * isf_q, /* (o) Q15 : quantized ISF (0..0.5) */
Word16 * past_isfq, /* (io)Q15 : past ISF quantizer */
Word16 * indice, /* (o) : quantization indices */
Word16 nb_surv /* (i) : number of survivor (1, 2, 3 or 4) */
)
{
Word16 i, k, tmp_ind[5];
Word16 surv1[N_SURV_MAX]; /* indices of survivors from 1st stage */
Word32 temp, min_err, distance;
Word16 isf[ORDER];
Word16 isf_stage2[ORDER];
for (i = 0; i < ORDER; i++)
{
/* isf[i] = isf1[i] - mean_isf[i] - MU*past_isfq[i] */
isf[i] = sub(isf1[i], mean_isf[i]);move16();
isf[i] = sub(isf[i], mult(MU, past_isfq[i])); move16();
}
VQ_stage1(&isf[0], dico1_isf, 9, SIZE_BK1, surv1, nb_surv);
distance = MAX_32; move32();
for (k = 0; k < nb_surv; k++)
{
for (i = 0; i < 9; i++)
{
isf_stage2[i] = sub(isf[i], dico1_isf[i + surv1[k] * 9]); move16();
}
tmp_ind[0] = Sub_VQ(&isf_stage2[0], dico21_isf, 3, SIZE_BK21, &min_err); move16();
temp = min_err; move32();
tmp_ind[1] = Sub_VQ(&isf_stage2[3], dico22_isf, 3, SIZE_BK22, &min_err); move16();
temp = L_add(temp, min_err);
tmp_ind[2] = Sub_VQ(&isf_stage2[6], dico23_isf, 3, SIZE_BK23, &min_err); move16();
temp = L_add(temp, min_err);
test();
if (L_sub(temp, distance) < (Word32) 0)
{
distance = temp; move32();
indice[0] = surv1[k]; move16();
for (i = 0; i < 3; i++)
{
indice[i + 2] = tmp_ind[i];move16();
}
}
}
VQ_stage1(&isf[9], dico2_isf, 7, SIZE_BK2, surv1, nb_surv);
distance = MAX_32; move32();
for (k = 0; k < nb_surv; k++)
{
for (i = 0; i < 7; i++)
{
isf_stage2[i] = sub(isf[9 + i], dico2_isf[i + surv1[k] * 7]); move16();
}
tmp_ind[0] = Sub_VQ(&isf_stage2[0], dico24_isf, 3, SIZE_BK24, &min_err); move16();
temp = min_err; move32();
tmp_ind[1] = Sub_VQ(&isf_stage2[3], dico25_isf, 4, SIZE_BK25, &min_err); move16();
temp = L_add(temp, min_err);
test();
if (L_sub(temp, distance) < (Word32) 0)
{
distance = temp; move32();
indice[1] = surv1[k]; move16();
for (i = 0; i < 2; i++)
{
indice[i + 5] = tmp_ind[i];move16();
}
}
}
Dpisf_2s_46b(indice, isf_q, past_isfq, isf_q, isf_q, 0, 0);
return;
}
/*-------------------------------------------------------------------*
* Function Qpisf_2s_36B() *
* ~~~~~~~~~ *
* Quantization of isf parameters with prediction. (36 bits) *
* *
* The isf vector is quantized using two-stage VQ with split-by-2 in *
* 1st stage and split-by-3 in the second stage. *
*-------------------------------------------------------------------*/
void Qpisf_2s_36b(
Word16 * isf1, /* (i) Q15 : ISF in the frequency domain (0..0.5) */
Word16 * isf_q, /* (o) Q15 : quantized ISF (0..0.5) */
Word16 * past_isfq, /* (io)Q15 : past ISF quantizer */
Word16 * indice, /* (o) : quantization indices */
Word16 nb_surv /* (i) : number of survivor (1, 2, 3 or 4) */
)
{
Word16 i, k, tmp_ind[5];
Word16 surv1[N_SURV_MAX]; /* indices of survivors from 1st stage */
Word32 temp, min_err, distance;
Word16 isf[ORDER];
Word16 isf_stage2[ORDER];
for (i = 0; i < ORDER; i++)
{
/* isf[i] = isf1[i] - mean_isf[i] - MU*past_isfq[i] */
isf[i] = sub(isf1[i], mean_isf[i]);move16();
isf[i] = sub(isf[i], mult(MU, past_isfq[i])); move16();
}
VQ_stage1(&isf[0], dico1_isf, 9, SIZE_BK1, surv1, nb_surv);
distance = MAX_32; move32();
for (k = 0; k < nb_surv; k++)
{
for (i = 0; i < 9; i++)
{
isf_stage2[i] = sub(isf[i], dico1_isf[i + surv1[k] * 9]); move16();
}
tmp_ind[0] = Sub_VQ(&isf_stage2[0], dico21_isf_36b, 5, SIZE_BK21_36b, &min_err); move16();
temp = min_err; move32();
tmp_ind[1] = Sub_VQ(&isf_stage2[5], dico22_isf_36b, 4, SIZE_BK22_36b, &min_err); move16();
temp = L_add(temp, min_err);
test();
if (L_sub(temp, distance) < (Word32) 0)
{
distance = temp; move32();
indice[0] = surv1[k]; move16();
for (i = 0; i < 2; i++)
{
indice[i + 2] = tmp_ind[i];move16();
}
}
}
VQ_stage1(&isf[9], dico2_isf, 7, SIZE_BK2, surv1, nb_surv);
distance = MAX_32; move32();
for (k = 0; k < nb_surv; k++)
{
for (i = 0; i < 7; i++)
{
isf_stage2[i] = sub(isf[9 + i], dico2_isf[i + surv1[k] * 7]); move16();
}
tmp_ind[0] = Sub_VQ(&isf_stage2[0], dico23_isf_36b, 7, SIZE_BK23_36b, &min_err); move16();
temp = min_err; move32();
test();
if (L_sub(temp, distance) < (Word32) 0)
{
distance = temp; move32();
indice[1] = surv1[k]; move16();
indice[4] = tmp_ind[0]; move16();
}
}
Dpisf_2s_36b(indice, isf_q, past_isfq, isf_q, isf_q, 0, 0);
return;
}
/*-------------------------------------------------------------------*
* routine: Disf_2s_46b() *
* ~~~~~~~~~ *
* Decoding of ISF parameters *
*-------------------------------------------------------------------*/
void Dpisf_2s_46b(
Word16 * indice, /* input: quantization indices */
Word16 * isf_q, /* output: quantized ISF in frequency domain (0..0.5) */
Word16 * past_isfq, /* i/0 : past ISF quantizer */
Word16 * isfold, /* input : past quantized ISF */
Word16 * isf_buf, /* input : isf buffer */
Word16 bfi, /* input : Bad frame indicator */
Word16 enc_dec
)
{
Word16 ref_isf[M];
Word16 i, j, tmp;
Word32 L_tmp;
test();
if (bfi == 0) /* Good frame */
{
for (i = 0; i < 9; i++)
{
isf_q[i] = dico1_isf[indice[0] * 9 + i]; move16();
}
for (i = 0; i < 7; i++)
{
isf_q[i + 9] = dico2_isf[indice[1] * 7 + i]; move16();
}
for (i = 0; i < 3; i++)
{
isf_q[i] = add(isf_q[i], dico21_isf[indice[2] * 3 + i]); move16();
}
for (i = 0; i < 3; i++)
{
isf_q[i + 3] = add(isf_q[i + 3], dico22_isf[indice[3] * 3 + i]); move16();
}
for (i = 0; i < 3; i++)
{
isf_q[i + 6] = add(isf_q[i + 6], dico23_isf[indice[4] * 3 + i]); move16();
}
for (i = 0; i < 3; i++)
{
isf_q[i + 9] = add(isf_q[i + 9], dico24_isf[indice[5] * 3 + i]); move16();
}
for (i = 0; i < 4; i++)
{
isf_q[i + 12] = add(isf_q[i + 12], dico25_isf[indice[6] * 4 + i]); move16();
}
for (i = 0; i < ORDER; i++)
{
tmp = isf_q[i]; move16();
isf_q[i] = add(tmp, mean_isf[i]); move16();
isf_q[i] = add(isf_q[i], mult(MU, past_isfq[i])); move16();
past_isfq[i] = tmp; move16();
}
test();
if (enc_dec)
{
for (i = 0; i < M; i++)
{
for (j = (L_MEANBUF - 1); j > 0; j--)
{
isf_buf[j * M + i] = isf_buf[(j - 1) * M + i]; move16();
}
isf_buf[i] = isf_q[i]; move16();
}
}
} else
{ /* bad frame */
for (i = 0; i < M; i++)
{
L_tmp = L_mult(mean_isf[i], 8192);
for (j = 0; j < L_MEANBUF; j++)
{
L_tmp = L_mac(L_tmp, isf_buf[j * M + i], 8192);
}
ref_isf[i] = round(L_tmp); move16();
}
/* use the past ISFs slightly shifted towards their mean */
for (i = 0; i < ORDER; i++)
{
isf_q[i] = add(mult(ALPHA, isfold[i]), mult(ONE_ALPHA, ref_isf[i])); move16();
}
/* estimate past quantized residual to be used in next frame */
for (i = 0; i < ORDER; i++)
{
tmp = add(ref_isf[i], mult(past_isfq[i], MU)); /* predicted ISF */
past_isfq[i] = sub(isf_q[i], tmp); move16();
past_isfq[i] = shr(past_isfq[i], 1); move16(); /* past_isfq[i] *= 0.5 */
}
}
Reorder_isf(isf_q, ISF_GAP, ORDER);
return;
}
/*-------------------------------------------------------------------*
* routine: Disf_2s_36b() *
* ~~~~~~~~~ *
* Decoding of ISF parameters *
*-------------------------------------------------------------------*/
void Dpisf_2s_36b(
Word16 * indice, /* input: quantization indices */
Word16 * isf_q, /* output: quantized ISF in frequency domain (0..0.5) */
Word16 * past_isfq, /* i/0 : past ISF quantizer */
Word16 * isfold, /* input : past quantized ISF */
Word16 * isf_buf, /* input : isf buffer */
Word16 bfi, /* input : Bad frame indicator */
Word16 enc_dec
)
{
Word16 ref_isf[M];
Word16 i, j, tmp;
Word32 L_tmp;
test();
if (bfi == 0) /* Good frame */
{
for (i = 0; i < 9; i++)
{
isf_q[i] = dico1_isf[indice[0] * 9 + i]; move16();
}
for (i = 0; i < 7; i++)
{
isf_q[i + 9] = dico2_isf[indice[1] * 7 + i]; move16();
}
for (i = 0; i < 5; i++)
{
isf_q[i] = add(isf_q[i], dico21_isf_36b[indice[2] * 5 + i]); move16();
}
for (i = 0; i < 4; i++)
{
isf_q[i + 5] = add(isf_q[i + 5], dico22_isf_36b[indice[3] * 4 + i]); move16();
}
for (i = 0; i < 7; i++)
{
isf_q[i + 9] = add(isf_q[i + 9], dico23_isf_36b[indice[4] * 7 + i]); move16();
}
for (i = 0; i < ORDER; i++)
{
tmp = isf_q[i];
isf_q[i] = add(tmp, mean_isf[i]); move16();
isf_q[i] = add(isf_q[i], mult(MU, past_isfq[i])); move16();
past_isfq[i] = tmp; move16();
}
test();
if (enc_dec)
{
for (i = 0; i < M; i++)
{
for (j = (L_MEANBUF - 1); j > 0; j--)
{
isf_buf[j * M + i] = isf_buf[(j - 1) * M + i]; move16();
}
isf_buf[i] = isf_q[i]; move16();
}
}
} else
{ /* bad frame */
for (i = 0; i < M; i++)
{
L_tmp = L_mult(mean_isf[i], 8192);
for (j = 0; j < L_MEANBUF; j++)
{
L_tmp = L_mac(L_tmp, isf_buf[j * M + i], 8192);
}
ref_isf[i] = round(L_tmp); move16();
}
/* use the past ISFs slightly shifted towards their mean */
for (i = 0; i < ORDER; i++)
{
isf_q[i] = add(mult(ALPHA, isfold[i]), mult(ONE_ALPHA, ref_isf[i])); move16();
}
/* estimate past quantized residual to be used in next frame */
for (i = 0; i < ORDER; i++)
{
tmp = add(ref_isf[i], mult(past_isfq[i], MU)); /* predicted ISF */
past_isfq[i] = sub(isf_q[i], tmp); move16();
past_isfq[i] = shr(past_isfq[i], 1); move16(); /* past_isfq[i] *= 0.5 */
}
}
Reorder_isf(isf_q, ISF_GAP, ORDER);
return;
}
/*--------------------------------------------------------------------------*
* procedure Reorder_isf() *
* ~~~~~~~~~~~~~ *
* To make sure that the isfs are properly order and to keep a certain *
* minimum distance between consecutive isfs. *
*--------------------------------------------------------------------------*
* Argument description in/out *
* ~~~~~~~~ ~~~~~~~~~~~ ~~~~~~ *
* isf[] vector of isfs i/o *
* min_dist minimum required distance i *
* n LPC order i *
*--------------------------------------------------------------------------*/
void Reorder_isf(
Word16 * isf, /* (i/o) Q15: ISF in the frequency domain (0..0.5) */
Word16 min_dist, /* (i) Q15 : minimum distance to keep */
Word16 n /* (i) : number of ISF */
)
{
Word16 i, isf_min;
isf_min = min_dist; move16();
for (i = 0; i < n - 1; i++)
{
test();
if (sub(isf[i], isf_min) < 0)
{
isf[i] = isf_min; move16();
}
isf_min = add(isf[i], min_dist);
}
return;
}
Word16 Sub_VQ( /* output: return quantization index */
Word16 * x, /* input : ISF residual vector */
Word16 * dico, /* input : quantization codebook */
Word16 dim, /* input : dimention of vector */
Word16 dico_size, /* input : size of quantization codebook */
Word32 * distance /* output: error of quantization */
)
{
Word16 i, j, index, temp, *p_dico;
Word32 dist_min, dist;
dist_min = MAX_32; move32();
p_dico = dico; move16();
index = 0; move16();
for (i = 0; i < dico_size; i++)
{
dist = 0; move32();
for (j = 0; j < dim; j++)
{
temp = sub(x[j], *p_dico++);
dist = L_mac(dist, temp, temp);
}
test();
if (L_sub(dist, dist_min) < (Word32) 0)
{
dist_min = dist; move32();
index = i; move16();
}
}
*distance = dist_min; move32();
/* Reading the selected vector */
p_dico = &dico[index * dim]; move16();
for (j = 0; j < dim; j++)
{
x[j] = *p_dico++; move16();
}
return index;
}
static void VQ_stage1(
Word16 * x, /* input : ISF residual vector */
Word16 * dico, /* input : quantization codebook */
Word16 dim, /* input : dimention of vector */
Word16 dico_size, /* input : size of quantization codebook */
Word16 * index, /* output: indices of survivors */
Word16 surv /* input : number of survivor */
)
{
Word16 i, j, k, l, temp, *p_dico;
Word32 dist_min[N_SURV_MAX], dist;
for (i = 0; i < surv; i++)
{
dist_min[i] = MAX_32; move32();
index[i] = i; move16();
}
p_dico = dico; move16();
for (i = 0; i < dico_size; i++)
{
dist = 0; move32();
for (j = 0; j < dim; j++)
{
temp = sub(x[j], *p_dico++);
dist = L_mac(dist, temp, temp);
}
for (k = 0; k < surv; k++)
{
test();
if (L_sub(dist, dist_min[k]) < (Word32) 0)
{
for (l = sub(surv, 1); l > k; l--)
{
dist_min[l] = dist_min[l - 1]; move32();
index[l] = index[l - 1]; move16();
}
dist_min[k] = dist; move32();
index[k] = i; move16();
break;
}
}
}
return;
}