media/libopus/silk/NLSF_VQ.c@ac0c01689b40 (annotated)
media/libopus/silk/NLSF_VQ.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "main.h" |
| michael@0 | 33 | |
| michael@0 | 34 | /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */ |
| michael@0 | 35 | void silk_NLSF_VQ( |
| michael@0 | 36 | opus_int32 err_Q26[], /* O Quantization errors [K] */ |
| michael@0 | 37 | const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */ |
| michael@0 | 38 | const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */ |
| michael@0 | 39 | const opus_int K, /* I Number of codebook vectors */ |
| michael@0 | 40 | const opus_int LPC_order /* I Number of LPCs */ |
| michael@0 | 41 | ) |
| michael@0 | 42 | { |
| michael@0 | 43 | opus_int i, m; |
| michael@0 | 44 | opus_int32 diff_Q15, sum_error_Q30, sum_error_Q26; |
| michael@0 | 45 | |
| michael@0 | 46 | silk_assert( LPC_order <= 16 ); |
| michael@0 | 47 | silk_assert( ( LPC_order & 1 ) == 0 ); |
| michael@0 | 48 | |
| michael@0 | 49 | /* Loop over codebook */ |
| michael@0 | 50 | for( i = 0; i < K; i++ ) { |
| michael@0 | 51 | sum_error_Q26 = 0; |
| michael@0 | 52 | for( m = 0; m < LPC_order; m += 2 ) { |
| michael@0 | 53 | /* Compute weighted squared quantization error for index m */ |
| michael@0 | 54 | diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ |
| michael@0 | 55 | sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 ); |
| michael@0 | 56 | |
| michael@0 | 57 | /* Compute weighted squared quantization error for index m + 1 */ |
| michael@0 | 58 | diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ |
| michael@0 | 59 | sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 ); |
| michael@0 | 60 | |
| michael@0 | 61 | sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 ); |
| michael@0 | 62 | |
| michael@0 | 63 | silk_assert( sum_error_Q26 >= 0 ); |
| michael@0 | 64 | silk_assert( sum_error_Q30 >= 0 ); |
| michael@0 | 65 | } |
| michael@0 | 66 | err_Q26[ i ] = sum_error_Q26; |
| michael@0 | 67 | } |
| michael@0 | 68 | } |
