Line data Source code
1 : /***********************************************************************
2 : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 : Redistribution and use in source and binary forms, with or without
4 : modification, are permitted provided that the following conditions
5 : are met:
6 : - Redistributions of source code must retain the above copyright notice,
7 : this list of conditions and the following disclaimer.
8 : - Redistributions in binary form must reproduce the above copyright
9 : notice, this list of conditions and the following disclaimer in the
10 : documentation and/or other materials provided with the distribution.
11 : - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 : names of specific contributors, may be used to endorse or promote
13 : products derived from this software without specific prior written
14 : permission.
15 : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 : POSSIBILITY OF SUCH DAMAGE.
26 : ***********************************************************************/
27 :
28 : #ifdef HAVE_CONFIG_H
29 : #include "config.h"
30 : #endif
31 :
32 : #include "main.h"
33 :
34 : /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
35 0 : void silk_NLSF_VQ(
36 : opus_int32 err_Q24[], /* O Quantization errors [K] */
37 : const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
38 : const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
39 : const opus_int16 pWght_Q9[], /* I Codebook weights [K*LPC_order] */
40 : const opus_int K, /* I Number of codebook vectors */
41 : const opus_int LPC_order /* I Number of LPCs */
42 : )
43 : {
44 : opus_int i, m;
45 : opus_int32 diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24;
46 : const opus_int16 *w_Q9_ptr;
47 : const opus_uint8 *cb_Q8_ptr;
48 :
49 0 : silk_assert( ( LPC_order & 1 ) == 0 );
50 :
51 : /* Loop over codebook */
52 0 : cb_Q8_ptr = pCB_Q8;
53 0 : w_Q9_ptr = pWght_Q9;
54 0 : for( i = 0; i < K; i++ ) {
55 0 : sum_error_Q24 = 0;
56 0 : pred_Q24 = 0;
57 0 : for( m = LPC_order-2; m >= 0; m -= 2 ) {
58 : /* Compute weighted absolute predictive quantization error for index m + 1 */
59 0 : diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/
60 0 : diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] );
61 0 : sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
62 0 : pred_Q24 = diffw_Q24;
63 :
64 : /* Compute weighted absolute predictive quantization error for index m */
65 0 : diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/
66 0 : diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] );
67 0 : sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
68 0 : pred_Q24 = diffw_Q24;
69 :
70 0 : silk_assert( sum_error_Q24 >= 0 );
71 : }
72 0 : err_Q24[ i ] = sum_error_Q24;
73 0 : cb_Q8_ptr += LPC_order;
74 0 : w_Q9_ptr += LPC_order;
75 : }
76 0 : }
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