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