media/libopus/silk/process_NLSFs.c@ac0c01689b40 (annotated)
media/libopus/silk/process_NLSFs.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 | /* Limit, stabilize, convert and quantize NLSFs */ |
| michael@0 | 35 | void silk_process_NLSFs( |
| michael@0 | 36 | silk_encoder_state *psEncC, /* I/O Encoder state */ |
| michael@0 | 37 | opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */ |
| michael@0 | 38 | opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */ |
| michael@0 | 39 | const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */ |
| michael@0 | 40 | ) |
| michael@0 | 41 | { |
| michael@0 | 42 | opus_int i, doInterpolate; |
| michael@0 | 43 | opus_int NLSF_mu_Q20; |
| michael@0 | 44 | opus_int32 i_sqr_Q15; |
| michael@0 | 45 | opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ]; |
| michael@0 | 46 | opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ]; |
| michael@0 | 47 | opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ]; |
| michael@0 | 48 | |
| michael@0 | 49 | silk_assert( psEncC->speech_activity_Q8 >= 0 ); |
| michael@0 | 50 | silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) ); |
| michael@0 | 51 | silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) ); |
| michael@0 | 52 | |
| michael@0 | 53 | /***********************/ |
| michael@0 | 54 | /* Calculate mu values */ |
| michael@0 | 55 | /***********************/ |
| michael@0 | 56 | /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */ |
| michael@0 | 57 | NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 ); |
| michael@0 | 58 | if( psEncC->nb_subfr == 2 ) { |
| michael@0 | 59 | /* Multiply by 1.5 for 10 ms packets */ |
| michael@0 | 60 | NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 ); |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | silk_assert( NLSF_mu_Q20 > 0 ); |
| michael@0 | 64 | silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) ); |
| michael@0 | 65 | |
| michael@0 | 66 | /* Calculate NLSF weights */ |
| michael@0 | 67 | silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder ); |
| michael@0 | 68 | |
| michael@0 | 69 | /* Update NLSF weights for interpolated NLSFs */ |
| michael@0 | 70 | doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 ); |
| michael@0 | 71 | if( doInterpolate ) { |
| michael@0 | 72 | /* Calculate the interpolated NLSF vector for the first half */ |
| michael@0 | 73 | silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, |
| michael@0 | 74 | psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); |
| michael@0 | 75 | |
| michael@0 | 76 | /* Calculate first half NLSF weights for the interpolated NLSFs */ |
| michael@0 | 77 | silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder ); |
| michael@0 | 78 | |
| michael@0 | 79 | /* Update NLSF weights with contribution from first half */ |
| michael@0 | 80 | i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 ); |
| michael@0 | 81 | for( i = 0; i < psEncC->predictLPCOrder; i++ ) { |
| michael@0 | 82 | pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 ); |
| michael@0 | 83 | silk_assert( pNLSFW_QW[ i ] >= 1 ); |
| michael@0 | 84 | } |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW, |
| michael@0 | 88 | NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType ); |
| michael@0 | 89 | |
| michael@0 | 90 | /* Convert quantized NLSFs back to LPC coefficients */ |
| michael@0 | 91 | silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder ); |
| michael@0 | 92 | |
| michael@0 | 93 | if( doInterpolate ) { |
| michael@0 | 94 | /* Calculate the interpolated, quantized LSF vector for the first half */ |
| michael@0 | 95 | silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, |
| michael@0 | 96 | psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); |
| michael@0 | 97 | |
| michael@0 | 98 | /* Convert back to LPC coefficients */ |
| michael@0 | 99 | silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder ); |
| michael@0 | 100 | |
| michael@0 | 101 | } else { |
| michael@0 | 102 | /* Copy LPC coefficients for first half from second half */ |
| michael@0 | 103 | silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) ); |
| michael@0 | 104 | } |
| michael@0 | 105 | } |
