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- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include "main.h"
- #define OFFSET ( ( MIN_QGAIN_DB * 128 ) / 6 + 16 * 128 )
- #define SCALE_Q16 ( ( 65536 * ( N_LEVELS_QGAIN - 1 ) ) / ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) )
- #define INV_SCALE_Q16 ( ( 65536 * ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) ) / ( N_LEVELS_QGAIN - 1 ) )
- void silk_gains_quant(
- opus_int8 ind[ MAX_NB_SUBFR ],
- opus_int32 gain_Q16[ MAX_NB_SUBFR ],
- opus_int8 *prev_ind,
- const opus_int conditional,
- const opus_int nb_subfr
- )
- {
- opus_int k, double_step_size_threshold;
- for( k = 0; k < nb_subfr; k++ ) {
-
- ind[ k ] = silk_SMULWB( SCALE_Q16, silk_lin2log( gain_Q16[ k ] ) - OFFSET );
-
- if( ind[ k ] < *prev_ind ) {
- ind[ k ]++;
- }
- ind[ k ] = silk_LIMIT_int( ind[ k ], 0, N_LEVELS_QGAIN - 1 );
-
- if( k == 0 && conditional == 0 ) {
-
- ind[ k ] = silk_LIMIT_int( ind[ k ], *prev_ind + MIN_DELTA_GAIN_QUANT, N_LEVELS_QGAIN - 1 );
- *prev_ind = ind[ k ];
- } else {
-
- ind[ k ] = ind[ k ] - *prev_ind;
-
- double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
- if( ind[ k ] > double_step_size_threshold ) {
- ind[ k ] = double_step_size_threshold + silk_RSHIFT( ind[ k ] - double_step_size_threshold + 1, 1 );
- }
- ind[ k ] = silk_LIMIT_int( ind[ k ], MIN_DELTA_GAIN_QUANT, MAX_DELTA_GAIN_QUANT );
-
- if( ind[ k ] > double_step_size_threshold ) {
- *prev_ind += silk_LSHIFT( ind[ k ], 1 ) - double_step_size_threshold;
- } else {
- *prev_ind += ind[ k ];
- }
-
- ind[ k ] -= MIN_DELTA_GAIN_QUANT;
- }
-
- gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) );
- }
- }
- void silk_gains_dequant(
- opus_int32 gain_Q16[ MAX_NB_SUBFR ],
- const opus_int8 ind[ MAX_NB_SUBFR ],
- opus_int8 *prev_ind,
- const opus_int conditional,
- const opus_int nb_subfr
- )
- {
- opus_int k, ind_tmp, double_step_size_threshold;
- for( k = 0; k < nb_subfr; k++ ) {
- if( k == 0 && conditional == 0 ) {
-
- *prev_ind = silk_max_int( ind[ k ], *prev_ind - 16 );
- } else {
-
- ind_tmp = ind[ k ] + MIN_DELTA_GAIN_QUANT;
-
- double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
- if( ind_tmp > double_step_size_threshold ) {
- *prev_ind += silk_LSHIFT( ind_tmp, 1 ) - double_step_size_threshold;
- } else {
- *prev_ind += ind_tmp;
- }
- }
- *prev_ind = silk_LIMIT_int( *prev_ind, 0, N_LEVELS_QGAIN - 1 );
-
- gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) );
- }
- }
- opus_int32 silk_gains_ID(
- const opus_int8 ind[ MAX_NB_SUBFR ],
- const opus_int nb_subfr
- )
- {
- opus_int k;
- opus_int32 gainsID;
- gainsID = 0;
- for( k = 0; k < nb_subfr; k++ ) {
- gainsID = silk_ADD_LSHIFT32( ind[ k ], gainsID, 8 );
- }
- return gainsID;
- }
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