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comparison: media/libopus/silk/float/process_gains_FLP.c
media/libopus/silk/float/process_gains_FLP.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:d6b9daab26fe |
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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_FLP.h" | |
| 33 #include "tuning_parameters.h" | |
| 34 | |
| 35 /* Processing of gains */ | |
| 36 void silk_process_gains_FLP( | |
| 37 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ | |
| 38 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ | |
| 39 opus_int condCoding /* I The type of conditional coding to use */ | |
| 40 ) | |
| 41 { | |
| 42 silk_shape_state_FLP *psShapeSt = &psEnc->sShape; | |
| 43 opus_int k; | |
| 44 opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; | |
| 45 silk_float s, InvMaxSqrVal, gain, quant_offset; | |
| 46 | |
| 47 /* Gain reduction when LTP coding gain is high */ | |
| 48 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { | |
| 49 s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); | |
| 50 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { | |
| 51 psEncCtrl->Gains[ k ] *= s; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 /* Limit the quantized signal */ | |
| 56 InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length ); | |
| 57 | |
| 58 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { | |
| 59 /* Soft limit on ratio residual energy and squared gains */ | |
| 60 gain = psEncCtrl->Gains[ k ]; | |
| 61 gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal ); | |
| 62 psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f ); | |
| 63 } | |
| 64 | |
| 65 /* Prepare gains for noise shaping quantization */ | |
| 66 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { | |
| 67 pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f ); | |
| 68 } | |
| 69 | |
| 70 /* Save unquantized gains and gain Index */ | |
| 71 silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); | |
| 72 psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; | |
| 73 | |
| 74 /* Quantize gains */ | |
| 75 silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, | |
| 76 &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); | |
| 77 | |
| 78 /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ | |
| 79 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { | |
| 80 psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f; | |
| 81 } | |
| 82 | |
| 83 /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ | |
| 84 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { | |
| 85 if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) { | |
| 86 psEnc->sCmn.indices.quantOffsetType = 0; | |
| 87 } else { | |
| 88 psEnc->sCmn.indices.quantOffsetType = 1; | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 /* Quantizer boundary adjustment */ | |
| 93 quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f; | |
| 94 psEncCtrl->Lambda = LAMBDA_OFFSET | |
| 95 + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision | |
| 96 + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ) | |
| 97 + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality | |
| 98 + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality | |
| 99 + LAMBDA_QUANT_OFFSET * quant_offset; | |
| 100 | |
| 101 silk_assert( psEncCtrl->Lambda > 0.0f ); | |
| 102 silk_assert( psEncCtrl->Lambda < 2.0f ); | |
| 103 } |
