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132 lines
6.3 KiB
132 lines
6.3 KiB
/*********************************************************************** |
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Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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- Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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- Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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- Neither the name of Internet Society, IETF or IETF Trust, nor the |
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names of specific contributors, may be used to endorse or promote |
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products derived from this software without specific prior written |
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permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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POSSIBILITY OF SUCH DAMAGE. |
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***********************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include <stdlib.h> |
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#include "main_FLP.h" |
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#include "tuning_parameters.h" |
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void silk_find_pitch_lags_FLP( |
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silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ |
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silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ |
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silk_float res[], /* O Residual */ |
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const silk_float x[], /* I Speech signal */ |
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int arch /* I Run-time architecture */ |
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) |
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{ |
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opus_int buf_len; |
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silk_float thrhld, res_nrg; |
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const silk_float *x_buf_ptr, *x_buf; |
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silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ]; |
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silk_float A[ MAX_FIND_PITCH_LPC_ORDER ]; |
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silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ]; |
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silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ]; |
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silk_float *Wsig_ptr; |
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/******************************************/ |
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/* Set up buffer lengths etc based on Fs */ |
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/******************************************/ |
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buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length; |
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/* Safety check */ |
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celt_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length ); |
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x_buf = x - psEnc->sCmn.ltp_mem_length; |
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/******************************************/ |
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/* Estimate LPC AR coefficients */ |
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/******************************************/ |
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/* Calculate windowed signal */ |
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/* First LA_LTP samples */ |
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x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length; |
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Wsig_ptr = Wsig; |
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silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch ); |
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/* Middle non-windowed samples */ |
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Wsig_ptr += psEnc->sCmn.la_pitch; |
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x_buf_ptr += psEnc->sCmn.la_pitch; |
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silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) ); |
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/* Last LA_LTP samples */ |
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Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); |
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x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); |
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silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch ); |
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/* Calculate autocorrelation sequence */ |
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silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch ); |
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/* Add white noise, as a fraction of the energy */ |
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auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1; |
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/* Calculate the reflection coefficients using Schur */ |
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res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder ); |
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/* Prediction gain */ |
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psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f ); |
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/* Convert reflection coefficients to prediction coefficients */ |
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silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder ); |
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/* Bandwidth expansion */ |
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silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION ); |
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/*****************************************/ |
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/* LPC analysis filtering */ |
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/*****************************************/ |
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silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder ); |
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if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) { |
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/* Threshold for pitch estimator */ |
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thrhld = 0.6f; |
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thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder; |
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thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); |
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thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1); |
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thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ); |
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/*****************************************/ |
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/* Call Pitch estimator */ |
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/*****************************************/ |
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if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, |
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&psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f, |
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thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 ) |
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{ |
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psEnc->sCmn.indices.signalType = TYPE_VOICED; |
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} else { |
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psEnc->sCmn.indices.signalType = TYPE_UNVOICED; |
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} |
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} else { |
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silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) ); |
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psEnc->sCmn.indices.lagIndex = 0; |
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psEnc->sCmn.indices.contourIndex = 0; |
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psEnc->LTPCorr = 0; |
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} |
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}
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