1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/float/find_pitch_lags_FLP.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,132 @@
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 <stdlib.h>
1.36 +#include "main_FLP.h"
1.37 +#include "tuning_parameters.h"
1.38 +
1.39 +void silk_find_pitch_lags_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 + silk_float res[], /* O Residual */
1.43 + const silk_float x[], /* I Speech signal */
1.44 + int arch /* I Run-time architecture */
1.45 +)
1.46 +{
1.47 + opus_int buf_len;
1.48 + silk_float thrhld, res_nrg;
1.49 + const silk_float *x_buf_ptr, *x_buf;
1.50 + silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
1.51 + silk_float A[ MAX_FIND_PITCH_LPC_ORDER ];
1.52 + silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
1.53 + silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ];
1.54 + silk_float *Wsig_ptr;
1.55 +
1.56 + /******************************************/
1.57 + /* Set up buffer lengths etc based on Fs */
1.58 + /******************************************/
1.59 + buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
1.60 +
1.61 + /* Safety check */
1.62 + silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
1.63 +
1.64 + x_buf = x - psEnc->sCmn.ltp_mem_length;
1.65 +
1.66 + /******************************************/
1.67 + /* Estimate LPC AR coeficients */
1.68 + /******************************************/
1.69 +
1.70 + /* Calculate windowed signal */
1.71 +
1.72 + /* First LA_LTP samples */
1.73 + x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
1.74 + Wsig_ptr = Wsig;
1.75 + silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
1.76 +
1.77 + /* Middle non-windowed samples */
1.78 + Wsig_ptr += psEnc->sCmn.la_pitch;
1.79 + x_buf_ptr += psEnc->sCmn.la_pitch;
1.80 + silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
1.81 +
1.82 + /* Last LA_LTP samples */
1.83 + Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
1.84 + x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
1.85 + silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
1.86 +
1.87 + /* Calculate autocorrelation sequence */
1.88 + silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
1.89 +
1.90 + /* Add white noise, as a fraction of the energy */
1.91 + auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
1.92 +
1.93 + /* Calculate the reflection coefficients using Schur */
1.94 + res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
1.95 +
1.96 + /* Prediction gain */
1.97 + psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
1.98 +
1.99 + /* Convert reflection coefficients to prediction coefficients */
1.100 + silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
1.101 +
1.102 + /* Bandwidth expansion */
1.103 + silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
1.104 +
1.105 + /*****************************************/
1.106 + /* LPC analysis filtering */
1.107 + /*****************************************/
1.108 + silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
1.109 +
1.110 + if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
1.111 + /* Threshold for pitch estimator */
1.112 + thrhld = 0.6f;
1.113 + thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
1.114 + thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f );
1.115 + thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1);
1.116 + thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
1.117 +
1.118 + /*****************************************/
1.119 + /* Call Pitch estimator */
1.120 + /*****************************************/
1.121 + if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
1.122 + &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
1.123 + thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 )
1.124 + {
1.125 + psEnc->sCmn.indices.signalType = TYPE_VOICED;
1.126 + } else {
1.127 + psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
1.128 + }
1.129 + } else {
1.130 + silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
1.131 + psEnc->sCmn.indices.lagIndex = 0;
1.132 + psEnc->sCmn.indices.contourIndex = 0;
1.133 + psEnc->LTPCorr = 0;
1.134 + }
1.135 +}
