| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132 |
- /***********************************************************************
- Copyright (c) 2006-2011, Skype Limited. All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- - Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- - Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- - Neither the name of Internet Society, IETF or IETF Trust, nor the
- names of specific contributors, may be used to endorse or promote
- products derived from this software without specific prior written
- permission.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
- ***********************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include "main.h"
- #include "tuning_parameters.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_int32 *sum_log_gain_Q7, /* I/O Cumulative max prediction gain */
- 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 ], /* 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_uint8 *cbk_gain_ptr_Q7;
- 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;
- opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7;
- opus_int gain_Q7;
- /***************************************************/
- /* iterate over different codebooks with different */
- /* rates/distortions, and choose best */
- /***************************************************/
- min_rate_dist_Q7 = silk_int32_MAX;
- best_sum_log_gain_Q7 = 0;
- for( k = 0; k < 3; k++ ) {
- /* Safety margin for pitch gain control, to take into account factors
- such as state rescaling/rewhitening. */
- opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );
- cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ];
- cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ];
- cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];
- cbk_size = silk_LTP_vq_sizes[ k ];
- /* Set up pointers to first subframe */
- XX_Q17_ptr = XX_Q17;
- xX_Q17_ptr = xX_Q17;
- res_nrg_Q15 = 0;
- rate_dist_Q7 = 0;
- sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;
- for( j = 0; j < nb_subfr; j++ ) {
- max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 )
- + SILK_FIX_CONST( 7, 7 ) ) - gain_safety;
- 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 */
- &gain_Q7, /* O sum of absolute LTP coefficients */
- XX_Q17_ptr, /* I correlation matrix */
- xX_Q17_ptr, /* I correlation vector */
- cbk_ptr_Q7, /* I codebook */
- cbk_gain_ptr_Q7, /* I codebook effective gains */
- cl_ptr_Q5, /* I code length for each codebook vector */
- subfr_len, /* I number of samples per subframe */
- max_gain_Q7, /* I maximum sum of absolute LTP coefficients */
- 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 );
- sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7
- + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ));
- 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 ) );
- best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;
- }
- }
- 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 );
- }
- *sum_log_gain_Q7 = best_sum_log_gain_Q7;
- *pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) );
- }
|
