ref: 52ded42ad9da32119c86e836ed603fe5c3d29f9f
dir: /silk/NLSF_VQ.c/
/***********************************************************************
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main.h"
/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
void silk_NLSF_VQ(
opus_int32 err_Q24[], /* O Quantization errors [K] */
const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
const opus_int16 pWght_Q9[], /* I Codebook weights [K*LPC_order] */
const opus_int K, /* I Number of codebook vectors */
const opus_int LPC_order /* I Number of LPCs */
)
{
opus_int i, m;
opus_int32 diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24;
const opus_int16 *w_Q9_ptr;
const opus_uint8 *cb_Q8_ptr;
silk_assert( ( LPC_order & 1 ) == 0 );
/* Loop over codebook */
cb_Q8_ptr = pCB_Q8;
w_Q9_ptr = pWght_Q9;
for( i = 0; i < K; i++ ) {
sum_error_Q24 = 0;
pred_Q24 = 0;
for( m = LPC_order-2; m >= 0; m -= 2 ) {
/* Compute weighted absolute predictive quantization error for index m + 1 */
diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/
diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] );
sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
pred_Q24 = diffw_Q24;
/* Compute weighted absolute predictive quantization error for index m */
diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/
diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] );
sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
pred_Q24 = diffw_Q24;
silk_assert( sum_error_Q24 >= 0 );
}
err_Q24[ i ] = sum_error_Q24;
cb_Q8_ptr += LPC_order;
w_Q9_ptr += LPC_order;
}
}