diff options
Diffstat (limited to 'src/opus-1.0.2/silk/fixed/noise_shape_analysis_FIX.c')
| -rw-r--r-- | src/opus-1.0.2/silk/fixed/noise_shape_analysis_FIX.c | 440 |
1 files changed, 0 insertions, 440 deletions
diff --git a/src/opus-1.0.2/silk/fixed/noise_shape_analysis_FIX.c b/src/opus-1.0.2/silk/fixed/noise_shape_analysis_FIX.c deleted file mode 100644 index d230e48d..00000000 --- a/src/opus-1.0.2/silk/fixed/noise_shape_analysis_FIX.c +++ /dev/null @@ -1,440 +0,0 @@ -/*********************************************************************** -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_FIX.h" -#include "tuning_parameters.h" - -/* Compute gain to make warped filter coefficients have a zero mean log frequency response on a */ -/* non-warped frequency scale. (So that it can be implemented with a minimum-phase monic filter.) */ -/* Note: A monic filter is one with the first coefficient equal to 1.0. In Silk we omit the first */ -/* coefficient in an array of coefficients, for monic filters. */ -static inline opus_int32 warped_gain( /* gain in Q16*/ - const opus_int32 *coefs_Q24, - opus_int lambda_Q16, - opus_int order -) { - opus_int i; - opus_int32 gain_Q24; - - lambda_Q16 = -lambda_Q16; - gain_Q24 = coefs_Q24[ order - 1 ]; - for( i = order - 2; i >= 0; i-- ) { - gain_Q24 = silk_SMLAWB( coefs_Q24[ i ], gain_Q24, lambda_Q16 ); - } - gain_Q24 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), gain_Q24, -lambda_Q16 ); - return silk_INVERSE32_varQ( gain_Q24, 40 ); -} - -/* Convert warped filter coefficients to monic pseudo-warped coefficients and limit maximum */ -/* amplitude of monic warped coefficients by using bandwidth expansion on the true coefficients */ -static inline void limit_warped_coefs( - opus_int32 *coefs_syn_Q24, - opus_int32 *coefs_ana_Q24, - opus_int lambda_Q16, - opus_int32 limit_Q24, - opus_int order -) { - opus_int i, iter, ind = 0; - opus_int32 tmp, maxabs_Q24, chirp_Q16, gain_syn_Q16, gain_ana_Q16; - opus_int32 nom_Q16, den_Q24; - - /* Convert to monic coefficients */ - lambda_Q16 = -lambda_Q16; - for( i = order - 1; i > 0; i-- ) { - coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); - coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); - } - lambda_Q16 = -lambda_Q16; - nom_Q16 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16, lambda_Q16 ); - den_Q24 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 ); - gain_syn_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 ); - den_Q24 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 ); - gain_ana_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 ); - for( i = 0; i < order; i++ ) { - coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); - coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); - } - - for( iter = 0; iter < 10; iter++ ) { - /* Find maximum absolute value */ - maxabs_Q24 = -1; - for( i = 0; i < order; i++ ) { - tmp = silk_max( silk_abs_int32( coefs_syn_Q24[ i ] ), silk_abs_int32( coefs_ana_Q24[ i ] ) ); - if( tmp > maxabs_Q24 ) { - maxabs_Q24 = tmp; - ind = i; - } - } - if( maxabs_Q24 <= limit_Q24 ) { - /* Coefficients are within range - done */ - return; - } - - /* Convert back to true warped coefficients */ - for( i = 1; i < order; i++ ) { - coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); - coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); - } - gain_syn_Q16 = silk_INVERSE32_varQ( gain_syn_Q16, 32 ); - gain_ana_Q16 = silk_INVERSE32_varQ( gain_ana_Q16, 32 ); - for( i = 0; i < order; i++ ) { - coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); - coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); - } - - /* Apply bandwidth expansion */ - chirp_Q16 = SILK_FIX_CONST( 0.99, 16 ) - silk_DIV32_varQ( - silk_SMULWB( maxabs_Q24 - limit_Q24, silk_SMLABB( SILK_FIX_CONST( 0.8, 10 ), SILK_FIX_CONST( 0.1, 10 ), iter ) ), - silk_MUL( maxabs_Q24, ind + 1 ), 22 ); - silk_bwexpander_32( coefs_syn_Q24, order, chirp_Q16 ); - silk_bwexpander_32( coefs_ana_Q24, order, chirp_Q16 ); - - /* Convert to monic warped coefficients */ - lambda_Q16 = -lambda_Q16; - for( i = order - 1; i > 0; i-- ) { - coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); - coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); - } - lambda_Q16 = -lambda_Q16; - nom_Q16 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16, lambda_Q16 ); - den_Q24 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 ); - gain_syn_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 ); - den_Q24 = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 ); - gain_ana_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 ); - for( i = 0; i < order; i++ ) { - coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); - coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); - } - } - silk_assert( 0 ); -} - -/**************************************************************/ -/* Compute noise shaping coefficients and initial gain values */ -/**************************************************************/ -void silk_noise_shape_analysis_FIX( - silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */ - silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control FIX */ - const opus_int16 *pitch_res, /* I LPC residual from pitch analysis */ - const opus_int16 *x /* I Input signal [ frame_length + la_shape ] */ -) -{ - silk_shape_state_FIX *psShapeSt = &psEnc->sShape; - opus_int k, i, nSamples, Qnrg, b_Q14, warping_Q16, scale = 0; - opus_int32 SNR_adj_dB_Q7, HarmBoost_Q16, HarmShapeGain_Q16, Tilt_Q16, tmp32; - opus_int32 nrg, pre_nrg_Q30, log_energy_Q7, log_energy_prev_Q7, energy_variation_Q7; - opus_int32 delta_Q16, BWExp1_Q16, BWExp2_Q16, gain_mult_Q16, gain_add_Q16, strength_Q16, b_Q8; - opus_int32 auto_corr[ MAX_SHAPE_LPC_ORDER + 1 ]; - opus_int32 refl_coef_Q16[ MAX_SHAPE_LPC_ORDER ]; - opus_int32 AR1_Q24[ MAX_SHAPE_LPC_ORDER ]; - opus_int32 AR2_Q24[ MAX_SHAPE_LPC_ORDER ]; - opus_int16 x_windowed[ SHAPE_LPC_WIN_MAX ]; - const opus_int16 *x_ptr, *pitch_res_ptr; - - /* Point to start of first LPC analysis block */ - x_ptr = x - psEnc->sCmn.la_shape; - - /****************/ - /* GAIN CONTROL */ - /****************/ - SNR_adj_dB_Q7 = psEnc->sCmn.SNR_dB_Q7; - - /* Input quality is the average of the quality in the lowest two VAD bands */ - psEncCtrl->input_quality_Q14 = ( opus_int )silk_RSHIFT( (opus_int32)psEnc->sCmn.input_quality_bands_Q15[ 0 ] - + psEnc->sCmn.input_quality_bands_Q15[ 1 ], 2 ); - - /* Coding quality level, between 0.0_Q0 and 1.0_Q0, but in Q14 */ - psEncCtrl->coding_quality_Q14 = silk_RSHIFT( silk_sigm_Q15( silk_RSHIFT_ROUND( SNR_adj_dB_Q7 - - SILK_FIX_CONST( 20.0, 7 ), 4 ) ), 1 ); - - /* Reduce coding SNR during low speech activity */ - if( psEnc->sCmn.useCBR == 0 ) { - b_Q8 = SILK_FIX_CONST( 1.0, 8 ) - psEnc->sCmn.speech_activity_Q8; - b_Q8 = silk_SMULWB( silk_LSHIFT( b_Q8, 8 ), b_Q8 ); - SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, - silk_SMULBB( SILK_FIX_CONST( -BG_SNR_DECR_dB, 7 ) >> ( 4 + 1 ), b_Q8 ), /* Q11*/ - silk_SMULWB( SILK_FIX_CONST( 1.0, 14 ) + psEncCtrl->input_quality_Q14, psEncCtrl->coding_quality_Q14 ) ); /* Q12*/ - } - - if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* Reduce gains for periodic signals */ - SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, SILK_FIX_CONST( HARM_SNR_INCR_dB, 8 ), psEnc->LTPCorr_Q15 ); - } else { - /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */ - SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, - silk_SMLAWB( SILK_FIX_CONST( 6.0, 9 ), -SILK_FIX_CONST( 0.4, 18 ), psEnc->sCmn.SNR_dB_Q7 ), - SILK_FIX_CONST( 1.0, 14 ) - psEncCtrl->input_quality_Q14 ); - } - - /*************************/ - /* SPARSENESS PROCESSING */ - /*************************/ - /* Set quantizer offset */ - if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* Initially set to 0; may be overruled in process_gains(..) */ - psEnc->sCmn.indices.quantOffsetType = 0; - psEncCtrl->sparseness_Q8 = 0; - } else { - /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */ - nSamples = silk_LSHIFT( psEnc->sCmn.fs_kHz, 1 ); - energy_variation_Q7 = 0; - log_energy_prev_Q7 = 0; - pitch_res_ptr = pitch_res; - for( k = 0; k < silk_SMULBB( SUB_FRAME_LENGTH_MS, psEnc->sCmn.nb_subfr ) / 2; k++ ) { - silk_sum_sqr_shift( &nrg, &scale, pitch_res_ptr, nSamples ); - nrg += silk_RSHIFT( nSamples, scale ); /* Q(-scale)*/ - - log_energy_Q7 = silk_lin2log( nrg ); - if( k > 0 ) { - energy_variation_Q7 += silk_abs( log_energy_Q7 - log_energy_prev_Q7 ); - } - log_energy_prev_Q7 = log_energy_Q7; - pitch_res_ptr += nSamples; - } - - psEncCtrl->sparseness_Q8 = silk_RSHIFT( silk_sigm_Q15( silk_SMULWB( energy_variation_Q7 - - SILK_FIX_CONST( 5.0, 7 ), SILK_FIX_CONST( 0.1, 16 ) ) ), 7 ); - - /* Set quantization offset depending on sparseness measure */ - if( psEncCtrl->sparseness_Q8 > SILK_FIX_CONST( SPARSENESS_THRESHOLD_QNT_OFFSET, 8 ) ) { - psEnc->sCmn.indices.quantOffsetType = 0; - } else { - psEnc->sCmn.indices.quantOffsetType = 1; - } - - /* Increase coding SNR for sparse signals */ - SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, SILK_FIX_CONST( SPARSE_SNR_INCR_dB, 15 ), psEncCtrl->sparseness_Q8 - SILK_FIX_CONST( 0.5, 8 ) ); - } - - /*******************************/ - /* Control bandwidth expansion */ - /*******************************/ - /* More BWE for signals with high prediction gain */ - strength_Q16 = silk_SMULWB( psEncCtrl->predGain_Q16, SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ); - BWExp1_Q16 = BWExp2_Q16 = silk_DIV32_varQ( SILK_FIX_CONST( BANDWIDTH_EXPANSION, 16 ), - silk_SMLAWW( SILK_FIX_CONST( 1.0, 16 ), strength_Q16, strength_Q16 ), 16 ); - delta_Q16 = silk_SMULWB( SILK_FIX_CONST( 1.0, 16 ) - silk_SMULBB( 3, psEncCtrl->coding_quality_Q14 ), - SILK_FIX_CONST( LOW_RATE_BANDWIDTH_EXPANSION_DELTA, 16 ) ); - BWExp1_Q16 = silk_SUB32( BWExp1_Q16, delta_Q16 ); - BWExp2_Q16 = silk_ADD32( BWExp2_Q16, delta_Q16 ); - /* BWExp1 will be applied after BWExp2, so make it relative */ - BWExp1_Q16 = silk_DIV32_16( silk_LSHIFT( BWExp1_Q16, 14 ), silk_RSHIFT( BWExp2_Q16, 2 ) ); - - if( psEnc->sCmn.warping_Q16 > 0 ) { - /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */ - warping_Q16 = silk_SMLAWB( psEnc->sCmn.warping_Q16, (opus_int32)psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( 0.01, 18 ) ); - } else { - warping_Q16 = 0; - } - - /********************************************/ - /* Compute noise shaping AR coefs and gains */ - /********************************************/ - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - /* Apply window: sine slope followed by flat part followed by cosine slope */ - opus_int shift, slope_part, flat_part; - flat_part = psEnc->sCmn.fs_kHz * 3; - slope_part = silk_RSHIFT( psEnc->sCmn.shapeWinLength - flat_part, 1 ); - - silk_apply_sine_window( x_windowed, x_ptr, 1, slope_part ); - shift = slope_part; - silk_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(opus_int16) ); - shift += flat_part; - silk_apply_sine_window( x_windowed + shift, x_ptr + shift, 2, slope_part ); - - /* Update pointer: next LPC analysis block */ - x_ptr += psEnc->sCmn.subfr_length; - - if( psEnc->sCmn.warping_Q16 > 0 ) { - /* Calculate warped auto correlation */ - silk_warped_autocorrelation_FIX( auto_corr, &scale, x_windowed, warping_Q16, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder ); - } else { - /* Calculate regular auto correlation */ - silk_autocorr( auto_corr, &scale, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1 ); - } - - /* Add white noise, as a fraction of energy */ - auto_corr[0] = silk_ADD32( auto_corr[0], silk_max_32( silk_SMULWB( silk_RSHIFT( auto_corr[ 0 ], 4 ), - SILK_FIX_CONST( SHAPE_WHITE_NOISE_FRACTION, 20 ) ), 1 ) ); - - /* Calculate the reflection coefficients using schur */ - nrg = silk_schur64( refl_coef_Q16, auto_corr, psEnc->sCmn.shapingLPCOrder ); - silk_assert( nrg >= 0 ); - - /* Convert reflection coefficients to prediction coefficients */ - silk_k2a_Q16( AR2_Q24, refl_coef_Q16, psEnc->sCmn.shapingLPCOrder ); - - Qnrg = -scale; /* range: -12...30*/ - silk_assert( Qnrg >= -12 ); - silk_assert( Qnrg <= 30 ); - - /* Make sure that Qnrg is an even number */ - if( Qnrg & 1 ) { - Qnrg -= 1; - nrg >>= 1; - } - - tmp32 = silk_SQRT_APPROX( nrg ); - Qnrg >>= 1; /* range: -6...15*/ - - psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( tmp32, 16 - Qnrg ); - - if( psEnc->sCmn.warping_Q16 > 0 ) { - /* Adjust gain for warping */ - gain_mult_Q16 = warped_gain( AR2_Q24, warping_Q16, psEnc->sCmn.shapingLPCOrder ); - silk_assert( psEncCtrl->Gains_Q16[ k ] >= 0 ); - if ( silk_SMULWW( silk_RSHIFT_ROUND( psEncCtrl->Gains_Q16[ k ], 1 ), gain_mult_Q16 ) >= ( silk_int32_MAX >> 1 ) ) { - psEncCtrl->Gains_Q16[ k ] = silk_int32_MAX; - } else { - psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 ); - } - } - - /* Bandwidth expansion for synthesis filter shaping */ - silk_bwexpander_32( AR2_Q24, psEnc->sCmn.shapingLPCOrder, BWExp2_Q16 ); - - /* Compute noise shaping filter coefficients */ - silk_memcpy( AR1_Q24, AR2_Q24, psEnc->sCmn.shapingLPCOrder * sizeof( opus_int32 ) ); - - /* Bandwidth expansion for analysis filter shaping */ - silk_assert( BWExp1_Q16 <= SILK_FIX_CONST( 1.0, 16 ) ); - silk_bwexpander_32( AR1_Q24, psEnc->sCmn.shapingLPCOrder, BWExp1_Q16 ); - - /* Ratio of prediction gains, in energy domain */ - pre_nrg_Q30 = silk_LPC_inverse_pred_gain_Q24( AR2_Q24, psEnc->sCmn.shapingLPCOrder ); - nrg = silk_LPC_inverse_pred_gain_Q24( AR1_Q24, psEnc->sCmn.shapingLPCOrder ); - - /*psEncCtrl->GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg ) = 0.3f + 0.7f * pre_nrg / nrg;*/ - pre_nrg_Q30 = silk_LSHIFT32( silk_SMULWB( pre_nrg_Q30, SILK_FIX_CONST( 0.7, 15 ) ), 1 ); - psEncCtrl->GainsPre_Q14[ k ] = ( opus_int ) SILK_FIX_CONST( 0.3, 14 ) + silk_DIV32_varQ( pre_nrg_Q30, nrg, 14 ); - - /* Convert to monic warped prediction coefficients and limit absolute values */ - limit_warped_coefs( AR2_Q24, AR1_Q24, warping_Q16, SILK_FIX_CONST( 3.999, 24 ), psEnc->sCmn.shapingLPCOrder ); - - /* Convert from Q24 to Q13 and store in int16 */ - for( i = 0; i < psEnc->sCmn.shapingLPCOrder; i++ ) { - psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( AR1_Q24[ i ], 11 ) ); - psEncCtrl->AR2_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( AR2_Q24[ i ], 11 ) ); - } - } - - /*****************/ - /* Gain tweaking */ - /*****************/ - /* Increase gains during low speech activity and put lower limit on gains */ - gain_mult_Q16 = silk_log2lin( -silk_SMLAWB( -SILK_FIX_CONST( 16.0, 7 ), SNR_adj_dB_Q7, SILK_FIX_CONST( 0.16, 16 ) ) ); - gain_add_Q16 = silk_log2lin( silk_SMLAWB( SILK_FIX_CONST( 16.0, 7 ), SILK_FIX_CONST( MIN_QGAIN_DB, 7 ), SILK_FIX_CONST( 0.16, 16 ) ) ); - silk_assert( gain_mult_Q16 > 0 ); - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 ); - silk_assert( psEncCtrl->Gains_Q16[ k ] >= 0 ); - psEncCtrl->Gains_Q16[ k ] = silk_ADD_POS_SAT32( psEncCtrl->Gains_Q16[ k ], gain_add_Q16 ); - } - - gain_mult_Q16 = SILK_FIX_CONST( 1.0, 16 ) + silk_RSHIFT_ROUND( silk_MLA( SILK_FIX_CONST( INPUT_TILT, 26 ), - psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( HIGH_RATE_INPUT_TILT, 12 ) ), 10 ); - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->GainsPre_Q14[ k ] = silk_SMULWB( gain_mult_Q16, psEncCtrl->GainsPre_Q14[ k ] ); - } - - /************************************************/ - /* Control low-frequency shaping and noise tilt */ - /************************************************/ - /* Less low frequency shaping for noisy inputs */ - strength_Q16 = silk_MUL( SILK_FIX_CONST( LOW_FREQ_SHAPING, 4 ), silk_SMLAWB( SILK_FIX_CONST( 1.0, 12 ), - SILK_FIX_CONST( LOW_QUALITY_LOW_FREQ_SHAPING_DECR, 13 ), psEnc->sCmn.input_quality_bands_Q15[ 0 ] - SILK_FIX_CONST( 1.0, 15 ) ) ); - strength_Q16 = silk_RSHIFT( silk_MUL( strength_Q16, psEnc->sCmn.speech_activity_Q8 ), 8 ); - if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* Reduce low frequencies quantization noise for periodic signals, depending on pitch lag */ - /*f = 400; freqz([1, -0.98 + 2e-4 * f], [1, -0.97 + 7e-4 * f], 2^12, Fs); axis([0, 1000, -10, 1])*/ - opus_int fs_kHz_inv = silk_DIV32_16( SILK_FIX_CONST( 0.2, 14 ), psEnc->sCmn.fs_kHz ); - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - b_Q14 = fs_kHz_inv + silk_DIV32_16( SILK_FIX_CONST( 3.0, 14 ), psEncCtrl->pitchL[ k ] ); - /* Pack two coefficients in one int32 */ - psEncCtrl->LF_shp_Q14[ k ] = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 - silk_SMULWB( strength_Q16, b_Q14 ), 16 ); - psEncCtrl->LF_shp_Q14[ k ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) ); - } - silk_assert( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ) < SILK_FIX_CONST( 0.5, 24 ) ); /* Guarantees that second argument to SMULWB() is within range of an opus_int16*/ - Tilt_Q16 = - SILK_FIX_CONST( HP_NOISE_COEF, 16 ) - - silk_SMULWB( SILK_FIX_CONST( 1.0, 16 ) - SILK_FIX_CONST( HP_NOISE_COEF, 16 ), - silk_SMULWB( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ), psEnc->sCmn.speech_activity_Q8 ) ); - } else { - b_Q14 = silk_DIV32_16( 21299, psEnc->sCmn.fs_kHz ); /* 1.3_Q0 = 21299_Q14*/ - /* Pack two coefficients in one int32 */ - psEncCtrl->LF_shp_Q14[ 0 ] = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 - - silk_SMULWB( strength_Q16, silk_SMULWB( SILK_FIX_CONST( 0.6, 16 ), b_Q14 ) ), 16 ); - psEncCtrl->LF_shp_Q14[ 0 ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) ); - for( k = 1; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->LF_shp_Q14[ k ] = psEncCtrl->LF_shp_Q14[ 0 ]; - } - Tilt_Q16 = -SILK_FIX_CONST( HP_NOISE_COEF, 16 ); - } - - /****************************/ - /* HARMONIC SHAPING CONTROL */ - /****************************/ - /* Control boosting of harmonic frequencies */ - HarmBoost_Q16 = silk_SMULWB( silk_SMULWB( SILK_FIX_CONST( 1.0, 17 ) - silk_LSHIFT( psEncCtrl->coding_quality_Q14, 3 ), - psEnc->LTPCorr_Q15 ), SILK_FIX_CONST( LOW_RATE_HARMONIC_BOOST, 16 ) ); - - /* More harmonic boost for noisy input signals */ - HarmBoost_Q16 = silk_SMLAWB( HarmBoost_Q16, - SILK_FIX_CONST( 1.0, 16 ) - silk_LSHIFT( psEncCtrl->input_quality_Q14, 2 ), SILK_FIX_CONST( LOW_INPUT_QUALITY_HARMONIC_BOOST, 16 ) ); - - if( USE_HARM_SHAPING && psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* More harmonic noise shaping for high bitrates or noisy input */ - HarmShapeGain_Q16 = silk_SMLAWB( SILK_FIX_CONST( HARMONIC_SHAPING, 16 ), - SILK_FIX_CONST( 1.0, 16 ) - silk_SMULWB( SILK_FIX_CONST( 1.0, 18 ) - silk_LSHIFT( psEncCtrl->coding_quality_Q14, 4 ), - psEncCtrl->input_quality_Q14 ), SILK_FIX_CONST( HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING, 16 ) ); - - /* Less harmonic noise shaping for less periodic signals */ - HarmShapeGain_Q16 = silk_SMULWB( silk_LSHIFT( HarmShapeGain_Q16, 1 ), - silk_SQRT_APPROX( silk_LSHIFT( psEnc->LTPCorr_Q15, 15 ) ) ); - } else { - HarmShapeGain_Q16 = 0; - } - - /*************************/ - /* Smooth over subframes */ - /*************************/ - for( k = 0; k < MAX_NB_SUBFR; k++ ) { - psShapeSt->HarmBoost_smth_Q16 = - silk_SMLAWB( psShapeSt->HarmBoost_smth_Q16, HarmBoost_Q16 - psShapeSt->HarmBoost_smth_Q16, SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) ); - psShapeSt->HarmShapeGain_smth_Q16 = - silk_SMLAWB( psShapeSt->HarmShapeGain_smth_Q16, HarmShapeGain_Q16 - psShapeSt->HarmShapeGain_smth_Q16, SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) ); - psShapeSt->Tilt_smth_Q16 = - silk_SMLAWB( psShapeSt->Tilt_smth_Q16, Tilt_Q16 - psShapeSt->Tilt_smth_Q16, SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) ); - - psEncCtrl->HarmBoost_Q14[ k ] = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->HarmBoost_smth_Q16, 2 ); - psEncCtrl->HarmShapeGain_Q14[ k ] = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->HarmShapeGain_smth_Q16, 2 ); - psEncCtrl->Tilt_Q14[ k ] = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->Tilt_smth_Q16, 2 ); - } -} |