ref: 52cfffe5793f5b69d4ecb762726dca16e2beb7ea
dir: /silk/quant_LTP_gains.c/
/***********************************************************************
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main.h"
void silk_quant_LTP_gains(
opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* O Quantized LTP gains */
opus_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */
opus_int8 *periodicity_index, /* O Periodicity Index */
opus_int *pred_gain_dB_Q7, /* O LTP prediction gain */
const opus_int32 XX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Correlation matrix in Q18 */
const opus_int32 xX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Correlation vector in Q18 */
const opus_int subfr_len, /* I Number of samples per subframe */
const opus_int nb_subfr, /* I Number of subframes */
int arch /* I Run-time architecture */
)
{
opus_int j, k, cbk_size;
opus_int8 temp_idx[ MAX_NB_SUBFR ];
const opus_uint8 *cl_ptr_Q5;
const opus_int8 *cbk_ptr_Q7;
const opus_int16 *b_Q14_ptr;
const opus_int32 *XX_Q17_ptr, *xX_Q17_ptr;
opus_int32 res_nrg_Q15_subfr, res_nrg_Q15, rate_dist_Q7_subfr, rate_dist_Q7, min_rate_dist_Q7;
/***************************************************/
/* iterate over different codebooks with different */
/* rates/distortions, and choose best */
/***************************************************/
min_rate_dist_Q7 = silk_int32_MAX;
for( k = 0; k < 3; k++ ) {
cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ];
cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ];
cbk_size = silk_LTP_vq_sizes[ k ];
/* Set up pointer to first subframe */
XX_Q17_ptr = XX_Q17;
xX_Q17_ptr = xX_Q17;
b_Q14_ptr = B_Q14;
res_nrg_Q15 = 0;
rate_dist_Q7 = 0;
for( j = 0; j < nb_subfr; j++ ) {
silk_VQ_WMat_EC(
&temp_idx[ j ], /* O index of best codebook vector */
&res_nrg_Q15_subfr, /* O residual energy */
&rate_dist_Q7_subfr, /* O best weighted quantization error + mu * rate */
XX_Q17_ptr, /* I correlation matrix */
xX_Q17_ptr, /* I correlation vector */
cbk_ptr_Q7, /* I codebook */
cl_ptr_Q5, /* I code length for each codebook vector */
subfr_len, /* I number of samples per subframe */
cbk_size, /* I number of vectors in codebook */
arch /* I Run-time architecture */
);
res_nrg_Q15 = silk_ADD_POS_SAT32( res_nrg_Q15, res_nrg_Q15_subfr );
rate_dist_Q7 = silk_ADD_POS_SAT32( rate_dist_Q7, rate_dist_Q7_subfr );
b_Q14_ptr += LTP_ORDER;
XX_Q17_ptr += LTP_ORDER * LTP_ORDER;
xX_Q17_ptr += LTP_ORDER;
}
if( rate_dist_Q7 <= min_rate_dist_Q7 ) {
min_rate_dist_Q7 = rate_dist_Q7;
*periodicity_index = (opus_int8)k;
silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
}
}
cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
for( j = 0; j < nb_subfr; j++ ) {
for( k = 0; k < LTP_ORDER; k++ ) {
B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
}
}
if( nb_subfr == 2 ) {
res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 1 );
} else {
res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 2 );
}
*pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) );
}