diff options
author | Christian Schneppe <christian@pix-art.de> | 2016-09-07 21:36:30 +0200 |
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committer | Christian Schneppe <christian@pix-art.de> | 2016-09-07 21:36:30 +0200 |
commit | 685341457b310d2b22f4b3048ea50e35e4f6be26 (patch) | |
tree | 047fe68b8c81d62a0e00f5e76c1930a9bdfcc7cb /src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c | |
parent | 2fa492c3eea4ae1050f4458b9e887b4f9780e2f5 (diff) |
optimized imports
Diffstat (limited to 'src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c')
-rw-r--r-- | src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c | 365 |
1 files changed, 0 insertions, 365 deletions
diff --git a/src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c b/src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c deleted file mode 100644 index 65f6ea587..000000000 --- a/src/main/jni/opus/silk/float/noise_shape_analysis_FLP.c +++ /dev/null @@ -1,365 +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_FLP.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 OPUS_INLINE silk_float warped_gain( - const silk_float *coefs, - silk_float lambda, - opus_int order -) { - opus_int i; - silk_float gain; - - lambda = -lambda; - gain = coefs[ order - 1 ]; - for( i = order - 2; i >= 0; i-- ) { - gain = lambda * gain + coefs[ i ]; - } - return (silk_float)( 1.0f / ( 1.0f - lambda * gain ) ); -} - -/* 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 OPUS_INLINE void warped_true2monic_coefs( - silk_float *coefs_syn, - silk_float *coefs_ana, - silk_float lambda, - silk_float limit, - opus_int order -) { - opus_int i, iter, ind = 0; - silk_float tmp, maxabs, chirp, gain_syn, gain_ana; - - /* Convert to monic coefficients */ - for( i = order - 1; i > 0; i-- ) { - coefs_syn[ i - 1 ] -= lambda * coefs_syn[ i ]; - coefs_ana[ i - 1 ] -= lambda * coefs_ana[ i ]; - } - gain_syn = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_syn[ 0 ] ); - gain_ana = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_ana[ 0 ] ); - for( i = 0; i < order; i++ ) { - coefs_syn[ i ] *= gain_syn; - coefs_ana[ i ] *= gain_ana; - } - - /* Limit */ - for( iter = 0; iter < 10; iter++ ) { - /* Find maximum absolute value */ - maxabs = -1.0f; - for( i = 0; i < order; i++ ) { - tmp = silk_max( silk_abs_float( coefs_syn[ i ] ), silk_abs_float( coefs_ana[ i ] ) ); - if( tmp > maxabs ) { - maxabs = tmp; - ind = i; - } - } - if( maxabs <= limit ) { - /* Coefficients are within range - done */ - return; - } - - /* Convert back to true warped coefficients */ - for( i = 1; i < order; i++ ) { - coefs_syn[ i - 1 ] += lambda * coefs_syn[ i ]; - coefs_ana[ i - 1 ] += lambda * coefs_ana[ i ]; - } - gain_syn = 1.0f / gain_syn; - gain_ana = 1.0f / gain_ana; - for( i = 0; i < order; i++ ) { - coefs_syn[ i ] *= gain_syn; - coefs_ana[ i ] *= gain_ana; - } - - /* Apply bandwidth expansion */ - chirp = 0.99f - ( 0.8f + 0.1f * iter ) * ( maxabs - limit ) / ( maxabs * ( ind + 1 ) ); - silk_bwexpander_FLP( coefs_syn, order, chirp ); - silk_bwexpander_FLP( coefs_ana, order, chirp ); - - /* Convert to monic warped coefficients */ - for( i = order - 1; i > 0; i-- ) { - coefs_syn[ i - 1 ] -= lambda * coefs_syn[ i ]; - coefs_ana[ i - 1 ] -= lambda * coefs_ana[ i ]; - } - gain_syn = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_syn[ 0 ] ); - gain_ana = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_ana[ 0 ] ); - for( i = 0; i < order; i++ ) { - coefs_syn[ i ] *= gain_syn; - coefs_ana[ i ] *= gain_ana; - } - } - silk_assert( 0 ); -} - -/* Compute noise shaping coefficients and initial gain values */ -void silk_noise_shape_analysis_FLP( - silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ - silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ - const silk_float *pitch_res, /* I LPC residual from pitch analysis */ - const silk_float *x /* I Input signal [frame_length + la_shape] */ -) -{ - silk_shape_state_FLP *psShapeSt = &psEnc->sShape; - opus_int k, nSamples; - silk_float SNR_adj_dB, HarmBoost, HarmShapeGain, Tilt; - silk_float nrg, pre_nrg, log_energy, log_energy_prev, energy_variation; - silk_float delta, BWExp1, BWExp2, gain_mult, gain_add, strength, b, warping; - silk_float x_windowed[ SHAPE_LPC_WIN_MAX ]; - silk_float auto_corr[ MAX_SHAPE_LPC_ORDER + 1 ]; - const silk_float *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 = psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ); - - /* Input quality is the average of the quality in the lowest two VAD bands */ - psEncCtrl->input_quality = 0.5f * ( psEnc->sCmn.input_quality_bands_Q15[ 0 ] + psEnc->sCmn.input_quality_bands_Q15[ 1 ] ) * ( 1.0f / 32768.0f ); - - /* Coding quality level, between 0.0 and 1.0 */ - psEncCtrl->coding_quality = silk_sigmoid( 0.25f * ( SNR_adj_dB - 20.0f ) ); - - if( psEnc->sCmn.useCBR == 0 ) { - /* Reduce coding SNR during low speech activity */ - b = 1.0f - psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); - SNR_adj_dB -= BG_SNR_DECR_dB * psEncCtrl->coding_quality * ( 0.5f + 0.5f * psEncCtrl->input_quality ) * b * b; - } - - if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* Reduce gains for periodic signals */ - SNR_adj_dB += HARM_SNR_INCR_dB * psEnc->LTPCorr; - } else { - /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */ - SNR_adj_dB += ( -0.4f * psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) + 6.0f ) * ( 1.0f - psEncCtrl->input_quality ); - } - - /*************************/ - /* 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 = 0.0f; - } else { - /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */ - nSamples = 2 * psEnc->sCmn.fs_kHz; - energy_variation = 0.0f; - log_energy_prev = 0.0f; - pitch_res_ptr = pitch_res; - for( k = 0; k < silk_SMULBB( SUB_FRAME_LENGTH_MS, psEnc->sCmn.nb_subfr ) / 2; k++ ) { - nrg = ( silk_float )nSamples + ( silk_float )silk_energy_FLP( pitch_res_ptr, nSamples ); - log_energy = silk_log2( nrg ); - if( k > 0 ) { - energy_variation += silk_abs_float( log_energy - log_energy_prev ); - } - log_energy_prev = log_energy; - pitch_res_ptr += nSamples; - } - psEncCtrl->sparseness = silk_sigmoid( 0.4f * ( energy_variation - 5.0f ) ); - - /* Set quantization offset depending on sparseness measure */ - if( psEncCtrl->sparseness > SPARSENESS_THRESHOLD_QNT_OFFSET ) { - psEnc->sCmn.indices.quantOffsetType = 0; - } else { - psEnc->sCmn.indices.quantOffsetType = 1; - } - - /* Increase coding SNR for sparse signals */ - SNR_adj_dB += SPARSE_SNR_INCR_dB * ( psEncCtrl->sparseness - 0.5f ); - } - - /*******************************/ - /* Control bandwidth expansion */ - /*******************************/ - /* More BWE for signals with high prediction gain */ - strength = FIND_PITCH_WHITE_NOISE_FRACTION * psEncCtrl->predGain; /* between 0.0 and 1.0 */ - BWExp1 = BWExp2 = BANDWIDTH_EXPANSION / ( 1.0f + strength * strength ); - delta = LOW_RATE_BANDWIDTH_EXPANSION_DELTA * ( 1.0f - 0.75f * psEncCtrl->coding_quality ); - BWExp1 -= delta; - BWExp2 += delta; - /* BWExp1 will be applied after BWExp2, so make it relative */ - BWExp1 /= BWExp2; - - if( psEnc->sCmn.warping_Q16 > 0 ) { - /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */ - warping = (silk_float)psEnc->sCmn.warping_Q16 / 65536.0f + 0.01f * psEncCtrl->coding_quality; - } else { - warping = 0.0f; - } - - /********************************************/ - /* 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 = ( psEnc->sCmn.shapeWinLength - flat_part ) / 2; - - silk_apply_sine_window_FLP( x_windowed, x_ptr, 1, slope_part ); - shift = slope_part; - silk_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(silk_float) ); - shift += flat_part; - silk_apply_sine_window_FLP( 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_FLP( auto_corr, x_windowed, warping, - psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder ); - } else { - /* Calculate regular auto correlation */ - silk_autocorrelation_FLP( auto_corr, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1 ); - } - - /* Add white noise, as a fraction of energy */ - auto_corr[ 0 ] += auto_corr[ 0 ] * SHAPE_WHITE_NOISE_FRACTION; - - /* Convert correlations to prediction coefficients, and compute residual energy */ - nrg = silk_levinsondurbin_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], auto_corr, psEnc->sCmn.shapingLPCOrder ); - psEncCtrl->Gains[ k ] = ( silk_float )sqrt( nrg ); - - if( psEnc->sCmn.warping_Q16 > 0 ) { - /* Adjust gain for warping */ - psEncCtrl->Gains[ k ] *= warped_gain( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], warping, psEnc->sCmn.shapingLPCOrder ); - } - - /* Bandwidth expansion for synthesis filter shaping */ - silk_bwexpander_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder, BWExp2 ); - - /* Compute noise shaping filter coefficients */ - silk_memcpy( - &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], - &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], - psEnc->sCmn.shapingLPCOrder * sizeof( silk_float ) ); - - /* Bandwidth expansion for analysis filter shaping */ - silk_bwexpander_FLP( &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder, BWExp1 ); - - /* Ratio of prediction gains, in energy domain */ - pre_nrg = silk_LPC_inverse_pred_gain_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder ); - nrg = silk_LPC_inverse_pred_gain_FLP( &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder ); - psEncCtrl->GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg ); - - /* Convert to monic warped prediction coefficients and limit absolute values */ - warped_true2monic_coefs( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], - warping, 3.999f, psEnc->sCmn.shapingLPCOrder ); - } - - /*****************/ - /* Gain tweaking */ - /*****************/ - /* Increase gains during low speech activity */ - gain_mult = (silk_float)pow( 2.0f, -0.16f * SNR_adj_dB ); - gain_add = (silk_float)pow( 2.0f, 0.16f * MIN_QGAIN_DB ); - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->Gains[ k ] *= gain_mult; - psEncCtrl->Gains[ k ] += gain_add; - } - - gain_mult = 1.0f + INPUT_TILT + psEncCtrl->coding_quality * HIGH_RATE_INPUT_TILT; - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->GainsPre[ k ] *= gain_mult; - } - - /************************************************/ - /* Control low-frequency shaping and noise tilt */ - /************************************************/ - /* Less low frequency shaping for noisy inputs */ - strength = LOW_FREQ_SHAPING * ( 1.0f + LOW_QUALITY_LOW_FREQ_SHAPING_DECR * ( psEnc->sCmn.input_quality_bands_Q15[ 0 ] * ( 1.0f / 32768.0f ) - 1.0f ) ); - strength *= psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); - 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])*/ - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - b = 0.2f / psEnc->sCmn.fs_kHz + 3.0f / psEncCtrl->pitchL[ k ]; - psEncCtrl->LF_MA_shp[ k ] = -1.0f + b; - psEncCtrl->LF_AR_shp[ k ] = 1.0f - b - b * strength; - } - Tilt = - HP_NOISE_COEF - - (1 - HP_NOISE_COEF) * HARM_HP_NOISE_COEF * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); - } else { - b = 1.3f / psEnc->sCmn.fs_kHz; - psEncCtrl->LF_MA_shp[ 0 ] = -1.0f + b; - psEncCtrl->LF_AR_shp[ 0 ] = 1.0f - b - b * strength * 0.6f; - for( k = 1; k < psEnc->sCmn.nb_subfr; k++ ) { - psEncCtrl->LF_MA_shp[ k ] = psEncCtrl->LF_MA_shp[ 0 ]; - psEncCtrl->LF_AR_shp[ k ] = psEncCtrl->LF_AR_shp[ 0 ]; - } - Tilt = -HP_NOISE_COEF; - } - - /****************************/ - /* HARMONIC SHAPING CONTROL */ - /****************************/ - /* Control boosting of harmonic frequencies */ - HarmBoost = LOW_RATE_HARMONIC_BOOST * ( 1.0f - psEncCtrl->coding_quality ) * psEnc->LTPCorr; - - /* More harmonic boost for noisy input signals */ - HarmBoost += LOW_INPUT_QUALITY_HARMONIC_BOOST * ( 1.0f - psEncCtrl->input_quality ); - - if( USE_HARM_SHAPING && psEnc->sCmn.indices.signalType == TYPE_VOICED ) { - /* Harmonic noise shaping */ - HarmShapeGain = HARMONIC_SHAPING; - - /* More harmonic noise shaping for high bitrates or noisy input */ - HarmShapeGain += HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING * - ( 1.0f - ( 1.0f - psEncCtrl->coding_quality ) * psEncCtrl->input_quality ); - - /* Less harmonic noise shaping for less periodic signals */ - HarmShapeGain *= ( silk_float )sqrt( psEnc->LTPCorr ); - } else { - HarmShapeGain = 0.0f; - } - - /*************************/ - /* Smooth over subframes */ - /*************************/ - for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { - psShapeSt->HarmBoost_smth += SUBFR_SMTH_COEF * ( HarmBoost - psShapeSt->HarmBoost_smth ); - psEncCtrl->HarmBoost[ k ] = psShapeSt->HarmBoost_smth; - psShapeSt->HarmShapeGain_smth += SUBFR_SMTH_COEF * ( HarmShapeGain - psShapeSt->HarmShapeGain_smth ); - psEncCtrl->HarmShapeGain[ k ] = psShapeSt->HarmShapeGain_smth; - psShapeSt->Tilt_smth += SUBFR_SMTH_COEF * ( Tilt - psShapeSt->Tilt_smth ); - psEncCtrl->Tilt[ k ] = psShapeSt->Tilt_smth; - } -} |