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media/libopus/silk/fixed/process_gains_FIX.c@6474c204b198 (annotated)

media/libopus/silk/fixed/process_gains_FIX.c

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

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_FIX.h"
michael@0 33 #include "tuning_parameters.h"
michael@0 34
michael@0 35 /* Processing of gains */
michael@0 36 void silk_process_gains_FIX(
michael@0 37 silk_encoder_state_FIX *psEnc, /* I/O Encoder state */
michael@0 38 silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control */
michael@0 39 opus_int condCoding /* I The type of conditional coding to use */
michael@0 40 )
michael@0 41 {
michael@0 42 silk_shape_state_FIX *psShapeSt = &psEnc->sShape;
michael@0 43 opus_int k;
michael@0 44 opus_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10;
michael@0 45
michael@0 46 /* Gain reduction when LTP coding gain is high */
michael@0 47 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
michael@0 48 /*s = -0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */
michael@0 49 s_Q16 = -silk_sigm_Q15( silk_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) );
michael@0 50 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
michael@0 51 psEncCtrl->Gains_Q16[ k ] = silk_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 );
michael@0 52 }
michael@0 53 }
michael@0 54
michael@0 55 /* Limit the quantized signal */
michael@0 56 /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */
michael@0 57 InvMaxSqrVal_Q16 = silk_DIV32_16( silk_log2lin(
michael@0 58 silk_SMULWB( SILK_FIX_CONST( 21 + 16 / 0.33, 7 ) - psEnc->sCmn.SNR_dB_Q7, SILK_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length );
michael@0 59
michael@0 60 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
michael@0 61 /* Soft limit on ratio residual energy and squared gains */
michael@0 62 ResNrg = psEncCtrl->ResNrg[ k ];
michael@0 63 ResNrgPart = silk_SMULWW( ResNrg, InvMaxSqrVal_Q16 );
michael@0 64 if( psEncCtrl->ResNrgQ[ k ] > 0 ) {
michael@0 65 ResNrgPart = silk_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] );
michael@0 66 } else {
michael@0 67 if( ResNrgPart >= silk_RSHIFT( silk_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) {
michael@0 68 ResNrgPart = silk_int32_MAX;
michael@0 69 } else {
michael@0 70 ResNrgPart = silk_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] );
michael@0 71 }
michael@0 72 }
michael@0 73 gain = psEncCtrl->Gains_Q16[ k ];
michael@0 74 gain_squared = silk_ADD_SAT32( ResNrgPart, silk_SMMUL( gain, gain ) );
michael@0 75 if( gain_squared < silk_int16_MAX ) {
michael@0 76 /* recalculate with higher precision */
michael@0 77 gain_squared = silk_SMLAWW( silk_LSHIFT( ResNrgPart, 16 ), gain, gain );
michael@0 78 silk_assert( gain_squared > 0 );
michael@0 79 gain = silk_SQRT_APPROX( gain_squared ); /* Q8 */
michael@0 80 gain = silk_min( gain, silk_int32_MAX >> 8 );
michael@0 81 psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 8 ); /* Q16 */
michael@0 82 } else {
michael@0 83 gain = silk_SQRT_APPROX( gain_squared ); /* Q0 */
michael@0 84 gain = silk_min( gain, silk_int32_MAX >> 16 );
michael@0 85 psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 16 ); /* Q16 */
michael@0 86 }
michael@0 87 }
michael@0 88
michael@0 89 /* Save unquantized gains and gain Index */
michael@0 90 silk_memcpy( psEncCtrl->GainsUnq_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
michael@0 91 psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
michael@0 92
michael@0 93 /* Quantize gains */
michael@0 94 silk_gains_quant( psEnc->sCmn.indices.GainsIndices, psEncCtrl->Gains_Q16,
michael@0 95 &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
michael@0 96
michael@0 97 /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
michael@0 98 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
michael@0 99 if( psEncCtrl->LTPredCodGain_Q7 + silk_RSHIFT( psEnc->sCmn.input_tilt_Q15, 8 ) > SILK_FIX_CONST( 1.0, 7 ) ) {
michael@0 100 psEnc->sCmn.indices.quantOffsetType = 0;
michael@0 101 } else {
michael@0 102 psEnc->sCmn.indices.quantOffsetType = 1;
michael@0 103 }
michael@0 104 }
michael@0 105
michael@0 106 /* Quantizer boundary adjustment */
michael@0 107 quant_offset_Q10 = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ];
michael@0 108 psEncCtrl->Lambda_Q10 = SILK_FIX_CONST( LAMBDA_OFFSET, 10 )
michael@0 109 + silk_SMULBB( SILK_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision )
michael@0 110 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_SPEECH_ACT, 18 ), psEnc->sCmn.speech_activity_Q8 )
michael@0 111 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_INPUT_QUALITY, 12 ), psEncCtrl->input_quality_Q14 )
michael@0 112 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_CODING_QUALITY, 12 ), psEncCtrl->coding_quality_Q14 )
michael@0 113 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_QUANT_OFFSET, 16 ), quant_offset_Q10 );
michael@0 114
michael@0 115 silk_assert( psEncCtrl->Lambda_Q10 > 0 );
michael@0 116 silk_assert( psEncCtrl->Lambda_Q10 < SILK_FIX_CONST( 2, 10 ) );
michael@0 117 }

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