1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/float/process_gains_FLP.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,103 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main_FLP.h"
1.36 +#include "tuning_parameters.h"
1.37 +
1.38 +/* Processing of gains */
1.39 +void silk_process_gains_FLP(
1.40 + silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
1.41 + silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
1.42 + opus_int condCoding /* I The type of conditional coding to use */
1.43 +)
1.44 +{
1.45 + silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
1.46 + opus_int k;
1.47 + opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
1.48 + silk_float s, InvMaxSqrVal, gain, quant_offset;
1.49 +
1.50 + /* Gain reduction when LTP coding gain is high */
1.51 + if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
1.52 + s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
1.53 + for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
1.54 + psEncCtrl->Gains[ k ] *= s;
1.55 + }
1.56 + }
1.57 +
1.58 + /* Limit the quantized signal */
1.59 + InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
1.60 +
1.61 + for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
1.62 + /* Soft limit on ratio residual energy and squared gains */
1.63 + gain = psEncCtrl->Gains[ k ];
1.64 + gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
1.65 + psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );
1.66 + }
1.67 +
1.68 + /* Prepare gains for noise shaping quantization */
1.69 + for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
1.70 + pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );
1.71 + }
1.72 +
1.73 + /* Save unquantized gains and gain Index */
1.74 + silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
1.75 + psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
1.76 +
1.77 + /* Quantize gains */
1.78 + silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
1.79 + &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
1.80 +
1.81 + /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
1.82 + for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
1.83 + psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
1.84 + }
1.85 +
1.86 + /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
1.87 + if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
1.88 + if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
1.89 + psEnc->sCmn.indices.quantOffsetType = 0;
1.90 + } else {
1.91 + psEnc->sCmn.indices.quantOffsetType = 1;
1.92 + }
1.93 + }
1.94 +
1.95 + /* Quantizer boundary adjustment */
1.96 + quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
1.97 + psEncCtrl->Lambda = LAMBDA_OFFSET
1.98 + + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
1.99 + + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f )
1.100 + + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality
1.101 + + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality
1.102 + + LAMBDA_QUANT_OFFSET * quant_offset;
1.103 +
1.104 + silk_assert( psEncCtrl->Lambda > 0.0f );
1.105 + silk_assert( psEncCtrl->Lambda < 2.0f );
1.106 +}
