media/libopus/silk/float/process_gains_FLP.c@b8a032363ba2 (annotated)
media/libopus/silk/float/process_gains_FLP.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| 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_FLP.h" |
| michael@0 | 33 | #include "tuning_parameters.h" |
| michael@0 | 34 | |
| michael@0 | 35 | /* Processing of gains */ |
| michael@0 | 36 | void silk_process_gains_FLP( |
| michael@0 | 37 | silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ |
| michael@0 | 38 | silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ |
| 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_FLP *psShapeSt = &psEnc->sShape; |
| michael@0 | 43 | opus_int k; |
| michael@0 | 44 | opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; |
| michael@0 | 45 | silk_float s, InvMaxSqrVal, gain, quant_offset; |
| michael@0 | 46 | |
| michael@0 | 47 | /* Gain reduction when LTP coding gain is high */ |
| michael@0 | 48 | if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| michael@0 | 49 | s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); |
| michael@0 | 50 | for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| michael@0 | 51 | psEncCtrl->Gains[ k ] *= s; |
| michael@0 | 52 | } |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | /* Limit the quantized signal */ |
| michael@0 | 56 | InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length ); |
| michael@0 | 57 | |
| michael@0 | 58 | for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| michael@0 | 59 | /* Soft limit on ratio residual energy and squared gains */ |
| michael@0 | 60 | gain = psEncCtrl->Gains[ k ]; |
| michael@0 | 61 | gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal ); |
| michael@0 | 62 | psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f ); |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | /* Prepare gains for noise shaping quantization */ |
| michael@0 | 66 | for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| michael@0 | 67 | pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f ); |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | /* Save unquantized gains and gain Index */ |
| michael@0 | 71 | silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); |
| michael@0 | 72 | psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; |
| michael@0 | 73 | |
| michael@0 | 74 | /* Quantize gains */ |
| michael@0 | 75 | silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, |
| michael@0 | 76 | &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); |
| michael@0 | 77 | |
| michael@0 | 78 | /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ |
| michael@0 | 79 | for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| michael@0 | 80 | psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f; |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ |
| michael@0 | 84 | if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| michael@0 | 85 | if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) { |
| michael@0 | 86 | psEnc->sCmn.indices.quantOffsetType = 0; |
| michael@0 | 87 | } else { |
| michael@0 | 88 | psEnc->sCmn.indices.quantOffsetType = 1; |
| michael@0 | 89 | } |
| michael@0 | 90 | } |
| michael@0 | 91 | |
| michael@0 | 92 | /* Quantizer boundary adjustment */ |
| michael@0 | 93 | quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f; |
| michael@0 | 94 | psEncCtrl->Lambda = LAMBDA_OFFSET |
| michael@0 | 95 | + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision |
| michael@0 | 96 | + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ) |
| michael@0 | 97 | + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality |
| michael@0 | 98 | + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality |
| michael@0 | 99 | + LAMBDA_QUANT_OFFSET * quant_offset; |
| michael@0 | 100 | |
| michael@0 | 101 | silk_assert( psEncCtrl->Lambda > 0.0f ); |
| michael@0 | 102 | silk_assert( psEncCtrl->Lambda < 2.0f ); |
| michael@0 | 103 | } |
