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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 | | 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 | 0 | { |
44 | 0 | opus_int i, m; |
45 | 0 | opus_int32 diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24; |
46 | 0 | const opus_int16 *w_Q9_ptr; |
47 | 0 | const opus_uint8 *cb_Q8_ptr; |
48 | |
|
49 | 0 | celt_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 | 0 | } |
72 | 0 | err_Q24[ i ] = sum_error_Q24; |
73 | 0 | cb_Q8_ptr += LPC_order; |
74 | 0 | w_Q9_ptr += LPC_order; |
75 | 0 | } |
76 | 0 | } |