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- /***********************************************************************
- 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"
- /* 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;
- celt_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;
- }
- }
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