ref: bf8577992e69de9182d29fe37739dbd6b5ac7354
dir: /src_common/SKP_Silk_NLSF_VQ_sum_error.c/
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#include "SKP_Silk_main.h"
/* Compute weighted quantization errors for an LPC_order element input vector, over one codebook stage */
void SKP_Silk_NLSF_VQ_sum_error(
SKP_int32 *err_Q19, /* O Weighted quantization errors [N*K] */
const SKP_int16 *in_Q15, /* I Input vectors to be quantized [N*LPC_order] */
const SKP_int *w_Q5, /* I Weighting vectors [LPC_order] */
const SKP_int8 *pCB_Q8, /* I Codebook vectors [K*LPC_order] */
const SKP_int N, /* I Number of input vectors */
const SKP_int K, /* I Number of codebook vectors */
const SKP_int stage, /* I Stage number */
const SKP_int LPC_order /* I Number of LPCs */
)
{
SKP_int i, n, m;
SKP_int32 diff_Q15, sum_error, Wtmp_Q5;
SKP_int32 Wcpy_Q5[ MAX_LPC_ORDER / 2 ];
const SKP_int8 *cb_vec_Q8;
SKP_assert( LPC_order <= 16 );
SKP_assert( ( LPC_order & 1 ) == 0 );
/* Copy to local stack and pack two weights per int32 */
for( m = 0; m < SKP_RSHIFT( LPC_order, 1 ); m++ ) {
Wcpy_Q5[ m ] = w_Q5[ 2 * m ] | SKP_LSHIFT( ( SKP_int32 )w_Q5[ 2 * m + 1 ], 16 );
}
if( stage == 0 ) {
/* Loop over input vectors */
for( n = 0; n < N; n++ ) {
/* Loop over codebook */
cb_vec_Q8 = pCB_Q8;
for( i = 0; i < K; i++ ) {
sum_error = 0;
for( m = 0; m < LPC_order; m += 2 ) {
/* Get two weights packed in an int32 */
Wtmp_Q5 = Wcpy_Q5[ m >> 1 ];
/* Compute weighted squared quantization error for index m */
diff_Q15 = in_Q15[ m ] - SKP_LSHIFT16( ( SKP_int16 )( *cb_vec_Q8++ ), 15 - NLSF_Q_DOMAIN_STAGE_0 ); // range: [ -32767 : 32767 ]
sum_error = SKP_SMLAWB( sum_error, SKP_SMULBB( diff_Q15, diff_Q15 ), Wtmp_Q5 );
/* Compute weighted squared quantization error for index m + 1 */
diff_Q15 = in_Q15[m + 1] - SKP_LSHIFT16( ( SKP_int16 )( *cb_vec_Q8++ ), 15 - NLSF_Q_DOMAIN_STAGE_0 ); // range: [ -32767 : 32767 ]
sum_error = SKP_SMLAWT( sum_error, SKP_SMULBB( diff_Q15, diff_Q15 ), Wtmp_Q5 );
}
SKP_assert( sum_error >= 0 );
err_Q19[ i ] = sum_error;
}
err_Q19 += K;
in_Q15 += LPC_order;
}
} else {
/* Loop over input vectors */
for( n = 0; n < N; n++ ) {
/* Loop over codebook */
cb_vec_Q8 = pCB_Q8;
for( i = 0; i < K; i++ ) {
sum_error = 0;
for( m = 0; m < LPC_order; m += 2 ) {
/* Get two weights packed in an int32 */
Wtmp_Q5 = Wcpy_Q5[ m >> 1 ];
/* Compute weighted squared quantization error for index m */
diff_Q15 = in_Q15[ m ] - SKP_LSHIFT16( ( SKP_int16 )( *cb_vec_Q8++ ), 15 - NLSF_Q_DOMAIN_STAGE_2_TO_LAST ); // range: [ -32767 : 32767 ]
sum_error = SKP_SMLAWB( sum_error, SKP_SMULBB( diff_Q15, diff_Q15 ), Wtmp_Q5 );
/* Compute weighted squared quantization error for index m + 1 */
diff_Q15 = in_Q15[m + 1] - SKP_LSHIFT16( ( SKP_int16 )( *cb_vec_Q8++ ), 15 - NLSF_Q_DOMAIN_STAGE_2_TO_LAST ); // range: [ -32767 : 32767 ]
sum_error = SKP_SMLAWT( sum_error, SKP_SMULBB( diff_Q15, diff_Q15 ), Wtmp_Q5 );
}
SKP_assert( sum_error >= 0 );
err_Q19[ i ] = sum_error;
}
err_Q19 += K;
in_Q15 += LPC_order;
}
}
}