/src/opus/silk/stereo_quant_pred.c
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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 |
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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 | | /* Quantize mid/side predictors */ |
35 | | void silk_stereo_quant_pred( |
36 | | opus_int32 pred_Q13[], /* I/O Predictors (out: quantized) */ |
37 | | opus_int8 ix[ 2 ][ 3 ] /* O Quantization indices */ |
38 | | ) |
39 | 0 | { |
40 | 0 | opus_int i, j, n; |
41 | 0 | opus_int32 low_Q13, step_Q13, lvl_Q13, err_min_Q13, err_Q13, quant_pred_Q13 = 0; |
42 | | |
43 | | /* Quantize */ |
44 | 0 | for( n = 0; n < 2; n++ ) { |
45 | | /* Brute-force search over quantization levels */ |
46 | 0 | err_min_Q13 = silk_int32_MAX; |
47 | 0 | for( i = 0; i < STEREO_QUANT_TAB_SIZE - 1; i++ ) { |
48 | 0 | low_Q13 = silk_stereo_pred_quant_Q13[ i ]; |
49 | 0 | step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ i + 1 ] - low_Q13, |
50 | 0 | SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) ); |
51 | 0 | for( j = 0; j < STEREO_QUANT_SUB_STEPS; j++ ) { |
52 | 0 | lvl_Q13 = silk_SMLABB( low_Q13, step_Q13, 2 * j + 1 ); |
53 | 0 | err_Q13 = silk_abs( pred_Q13[ n ] - lvl_Q13 ); |
54 | 0 | if( err_Q13 < err_min_Q13 ) { |
55 | 0 | err_min_Q13 = err_Q13; |
56 | 0 | quant_pred_Q13 = lvl_Q13; |
57 | 0 | ix[ n ][ 0 ] = i; |
58 | 0 | ix[ n ][ 1 ] = j; |
59 | 0 | } else { |
60 | | /* Error increasing, so we're past the optimum */ |
61 | 0 | goto done; |
62 | 0 | } |
63 | 0 | } |
64 | 0 | } |
65 | 0 | done: |
66 | 0 | ix[ n ][ 2 ] = silk_DIV32_16( ix[ n ][ 0 ], 3 ); |
67 | 0 | ix[ n ][ 0 ] -= ix[ n ][ 2 ] * 3; |
68 | 0 | pred_Q13[ n ] = quant_pred_Q13; |
69 | 0 | } |
70 | | |
71 | | /* Subtract second from first predictor (helps when actually applying these) */ |
72 | 0 | pred_Q13[ 0 ] -= pred_Q13[ 1 ]; |
73 | 0 | } |