117 lines
5.9 KiB
C
Executable file
117 lines
5.9 KiB
C
Executable file
/***********************************************************************
|
|
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"
|
|
|
|
/* Find LPC and LTP coefficients */
|
|
void silk_find_pred_coefs_FLP(
|
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
|
|
silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
|
|
const silk_float res_pitch[], /* I Residual from pitch analysis */
|
|
const silk_float x[], /* I Speech signal */
|
|
opus_int condCoding /* I The type of conditional coding to use */
|
|
)
|
|
{
|
|
opus_int i;
|
|
silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
|
|
silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
|
|
opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
|
|
const silk_float *x_ptr;
|
|
silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
|
|
silk_float minInvGain;
|
|
|
|
/* Weighting for weighted least squares */
|
|
for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
|
|
silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
|
|
invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
|
|
Wght[ i ] = invGains[ i ] * invGains[ i ];
|
|
}
|
|
|
|
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
|
|
/**********/
|
|
/* VOICED */
|
|
/**********/
|
|
silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
|
|
|
|
/* LTP analysis */
|
|
silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
|
|
psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
|
|
|
|
/* Quantize LTP gain parameters */
|
|
silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
|
|
&psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr );
|
|
|
|
/* Control LTP scaling */
|
|
silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
|
|
|
|
/* Create LTP residual */
|
|
silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
|
|
psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
|
|
} else {
|
|
/************/
|
|
/* UNVOICED */
|
|
/************/
|
|
/* Create signal with prepended subframes, scaled by inverse gains */
|
|
x_ptr = x - psEnc->sCmn.predictLPCOrder;
|
|
x_pre_ptr = LPC_in_pre;
|
|
for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
|
|
silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
|
|
psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
|
|
x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
|
|
x_ptr += psEnc->sCmn.subfr_length;
|
|
}
|
|
silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
|
|
psEncCtrl->LTPredCodGain = 0.0f;
|
|
psEnc->sCmn.sum_log_gain_Q7 = 0;
|
|
}
|
|
|
|
/* Limit on total predictive coding gain */
|
|
if( psEnc->sCmn.first_frame_after_reset ) {
|
|
minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
|
|
} else {
|
|
minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
|
|
minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
|
|
}
|
|
|
|
/* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
|
|
silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
|
|
|
|
/* Quantize LSFs */
|
|
silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
|
|
|
|
/* Calculate residual energy using quantized LPC coefficients */
|
|
silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
|
|
psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
|
|
|
|
/* Copy to prediction struct for use in next frame for interpolation */
|
|
silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
|
|
}
|
|
|