995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
145 lines
7.2 KiB
C
145 lines
7.2 KiB
C
/***********************************************************************
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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 "main_FIX.h"
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#include "stack_alloc.h"
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#include "tuning_parameters.h"
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/* Find pitch lags */
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void silk_find_pitch_lags_FIX(
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silk_encoder_state_FIX *psEnc, /* I/O encoder state */
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silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
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opus_int16 res[], /* O residual */
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const opus_int16 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, i, scale;
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opus_int32 thrhld_Q13, res_nrg;
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const opus_int16 *x_buf, *x_buf_ptr;
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VARDECL( opus_int16, Wsig );
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opus_int16 *Wsig_ptr;
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opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
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opus_int16 rc_Q15[ MAX_FIND_PITCH_LPC_ORDER ];
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opus_int32 A_Q24[ MAX_FIND_PITCH_LPC_ORDER ];
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opus_int16 A_Q12[ MAX_FIND_PITCH_LPC_ORDER ];
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SAVE_STACK;
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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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silk_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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ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 );
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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( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
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/* Middle un - 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 - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
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/* Last LA_LTP samples */
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Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
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x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
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silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
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/* Calculate autocorrelation sequence */
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silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch );
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/* Add white noise, as fraction of energy */
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auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
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/* Calculate the reflection coefficients using schur */
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res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Prediction gain */
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psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
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/* Convert reflection coefficients to prediction coefficients */
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silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Convert From 32 bit Q24 to 16 bit Q12 coefs */
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for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
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A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
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}
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/* Do BWE */
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silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
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/*****************************************/
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/* LPC analysis filtering */
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/*****************************************/
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silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder, psEnc->sCmn.arch );
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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_Q13 = SILK_FIX_CONST( 0.6, 13 );
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thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder );
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thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 21 ), psEnc->sCmn.speech_activity_Q8 );
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thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15, 13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
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thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 14 ), psEnc->sCmn.input_tilt_Q15 );
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thrhld_Q13 = silk_SAT16( thrhld_Q13 );
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/*****************************************/
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/* Call pitch estimator */
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/*****************************************/
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if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
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&psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
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(opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
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psEnc->sCmn.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_Q15 = 0;
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}
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RESTORE_STACK;
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}
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