зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
6.2 KiB
C
132 строки
6.2 KiB
C
/***********************************************************************
|
|
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 <stdlib.h>
|
|
#include "main_FLP.h"
|
|
#include "tuning_parameters.h"
|
|
|
|
void silk_find_pitch_lags_FLP(
|
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
|
|
silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
|
|
silk_float res[], /* O Residual */
|
|
const silk_float x[] /* I Speech signal */
|
|
)
|
|
{
|
|
opus_int buf_len;
|
|
silk_float thrhld, res_nrg;
|
|
const silk_float *x_buf_ptr, *x_buf;
|
|
silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
|
|
silk_float A[ MAX_FIND_PITCH_LPC_ORDER ];
|
|
silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
|
|
silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ];
|
|
silk_float *Wsig_ptr;
|
|
|
|
/******************************************/
|
|
/* Set up buffer lengths etc based on Fs */
|
|
/******************************************/
|
|
buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
|
|
|
|
/* Safety check */
|
|
silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
|
|
|
|
x_buf = x - psEnc->sCmn.ltp_mem_length;
|
|
|
|
/******************************************/
|
|
/* Estimate LPC AR coeficients */
|
|
/******************************************/
|
|
|
|
/* Calculate windowed signal */
|
|
|
|
/* First LA_LTP samples */
|
|
x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
|
|
Wsig_ptr = Wsig;
|
|
silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
|
|
|
|
/* Middle non-windowed samples */
|
|
Wsig_ptr += psEnc->sCmn.la_pitch;
|
|
x_buf_ptr += psEnc->sCmn.la_pitch;
|
|
silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
|
|
|
|
/* Last LA_LTP samples */
|
|
Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
|
|
x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
|
|
silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
|
|
|
|
/* Calculate autocorrelation sequence */
|
|
silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
|
|
|
|
/* Add white noise, as a fraction of the energy */
|
|
auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
|
|
|
|
/* Calculate the reflection coefficients using Schur */
|
|
res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
|
|
|
|
/* Prediction gain */
|
|
psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
|
|
|
|
/* Convert reflection coefficients to prediction coefficients */
|
|
silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
|
|
|
|
/* Bandwidth expansion */
|
|
silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
|
|
|
|
/*****************************************/
|
|
/* LPC analysis filtering */
|
|
/*****************************************/
|
|
silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
|
|
|
|
if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
|
|
/* Threshold for pitch estimator */
|
|
thrhld = 0.6f;
|
|
thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
|
|
thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f );
|
|
thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1);
|
|
thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
|
|
|
|
/*****************************************/
|
|
/* Call Pitch estimator */
|
|
/*****************************************/
|
|
if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
|
|
&psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
|
|
thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr ) == 0 )
|
|
{
|
|
psEnc->sCmn.indices.signalType = TYPE_VOICED;
|
|
} else {
|
|
psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
|
|
}
|
|
} else {
|
|
silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
|
|
psEnc->sCmn.indices.lagIndex = 0;
|
|
psEnc->sCmn.indices.contourIndex = 0;
|
|
psEnc->LTPCorr = 0;
|
|
}
|
|
}
|