Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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_Q26[], /* 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_int K, /* I Number of codebook vectors */ |
| 40 | const opus_int LPC_order /* I Number of LPCs */ |
| 41 | ) |
| 42 | { |
| 43 | opus_int i, m; |
| 44 | opus_int32 diff_Q15, sum_error_Q30, sum_error_Q26; |
| 45 | |
| 46 | silk_assert( LPC_order <= 16 ); |
| 47 | silk_assert( ( LPC_order & 1 ) == 0 ); |
| 48 | |
| 49 | /* Loop over codebook */ |
| 50 | for( i = 0; i < K; i++ ) { |
| 51 | sum_error_Q26 = 0; |
| 52 | for( m = 0; m < LPC_order; m += 2 ) { |
| 53 | /* Compute weighted squared quantization error for index m */ |
| 54 | diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ |
| 55 | sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 ); |
| 56 | |
| 57 | /* Compute weighted squared quantization error for index m + 1 */ |
| 58 | diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ |
| 59 | sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 ); |
| 60 | |
| 61 | sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 ); |
| 62 | |
| 63 | silk_assert( sum_error_Q26 >= 0 ); |
| 64 | silk_assert( sum_error_Q30 >= 0 ); |
| 65 | } |
| 66 | err_Q26[ i ] = sum_error_Q26; |
| 67 | } |
| 68 | } |