You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
5.0 KiB
103 lines
5.0 KiB
/*********************************************************************** |
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
|
Redistribution and use in source and binary forms, with or without |
|
modification, are permitted provided that the following conditions |
|
are met: |
|
- Redistributions of source code must retain the above copyright notice, |
|
this list of conditions and the following disclaimer. |
|
- Redistributions in binary form must reproduce the above copyright |
|
notice, this list of conditions and the following disclaimer in the |
|
documentation and/or other materials provided with the distribution. |
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the |
|
names of specific contributors, may be used to endorse or promote |
|
products derived from this software without specific prior written |
|
permission. |
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
|
POSSIBILITY OF SUCH DAMAGE. |
|
***********************************************************************/ |
|
|
|
#ifdef HAVE_CONFIG_H |
|
#include "config.h" |
|
#endif |
|
|
|
#include "main_FLP.h" |
|
#include "tuning_parameters.h" |
|
|
|
/* Processing of gains */ |
|
void silk_process_gains_FLP( |
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ |
|
silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ |
|
opus_int condCoding /* I The type of conditional coding to use */ |
|
) |
|
{ |
|
silk_shape_state_FLP *psShapeSt = &psEnc->sShape; |
|
opus_int k; |
|
opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; |
|
silk_float s, InvMaxSqrVal, gain, quant_offset; |
|
|
|
/* Gain reduction when LTP coding gain is high */ |
|
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
|
s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); |
|
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
|
psEncCtrl->Gains[ k ] *= s; |
|
} |
|
} |
|
|
|
/* Limit the quantized signal */ |
|
InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length ); |
|
|
|
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
|
/* Soft limit on ratio residual energy and squared gains */ |
|
gain = psEncCtrl->Gains[ k ]; |
|
gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal ); |
|
psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f ); |
|
} |
|
|
|
/* Prepare gains for noise shaping quantization */ |
|
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
|
pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f ); |
|
} |
|
|
|
/* Save unquantized gains and gain Index */ |
|
silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); |
|
psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; |
|
|
|
/* Quantize gains */ |
|
silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, |
|
&psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); |
|
|
|
/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ |
|
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
|
psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f; |
|
} |
|
|
|
/* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ |
|
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
|
if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) { |
|
psEnc->sCmn.indices.quantOffsetType = 0; |
|
} else { |
|
psEnc->sCmn.indices.quantOffsetType = 1; |
|
} |
|
} |
|
|
|
/* Quantizer boundary adjustment */ |
|
quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f; |
|
psEncCtrl->Lambda = LAMBDA_OFFSET |
|
+ LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision |
|
+ LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ) |
|
+ LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality |
|
+ LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality |
|
+ LAMBDA_QUANT_OFFSET * quant_offset; |
|
|
|
silk_assert( psEncCtrl->Lambda > 0.0f ); |
|
silk_assert( psEncCtrl->Lambda < 2.0f ); |
|
}
|
|
|