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comparison: media/libopus/silk/NLSF_VQ.c
media/libopus/silk/NLSF_VQ.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:8850d7133237 |
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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_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 } |
