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path: root/src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c
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Diffstat (limited to 'src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c')
-rw-r--r--src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c b/src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c
new file mode 100644
index 00000000..620f8dcd
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+++ b/src/opus-1.1/silk/fixed/find_pitch_lags_FIX.c
@@ -0,0 +1,145 @@
+/***********************************************************************
+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_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Find pitch lags */
+void silk_find_pitch_lags_FIX(
+ silk_encoder_state_FIX *psEnc, /* I/O encoder state */
+ silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
+ opus_int16 res[], /* O residual */
+ const opus_int16 x[], /* I Speech signal */
+ int arch /* I Run-time architecture */
+)
+{
+ opus_int buf_len, i, scale;
+ opus_int32 thrhld_Q13, res_nrg;
+ const opus_int16 *x_buf, *x_buf_ptr;
+ VARDECL( opus_int16, Wsig );
+ opus_int16 *Wsig_ptr;
+ opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
+ opus_int16 rc_Q15[ MAX_FIND_PITCH_LPC_ORDER ];
+ opus_int32 A_Q24[ MAX_FIND_PITCH_LPC_ORDER ];
+ opus_int16 A_Q12[ MAX_FIND_PITCH_LPC_ORDER ];
+ SAVE_STACK;
+
+ /******************************************/
+ /* 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 coefficients */
+ /*************************************/
+
+ /* Calculate windowed signal */
+
+ ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 );
+
+ /* First LA_LTP samples */
+ x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
+ Wsig_ptr = Wsig;
+ silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
+
+ /* Middle un - 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 - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
+
+ /* Last LA_LTP samples */
+ Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
+ x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
+ silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
+
+ /* Calculate autocorrelation sequence */
+ silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch );
+
+ /* Add white noise, as fraction of energy */
+ auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
+
+ /* Calculate the reflection coefficients using schur */
+ res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
+
+ /* Prediction gain */
+ psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
+
+ /* Convert reflection coefficients to prediction coefficients */
+ silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
+
+ /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
+ for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
+ A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
+ }
+
+ /* Do BWE */
+ silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
+
+ /*****************************************/
+ /* LPC analysis filtering */
+ /*****************************************/
+ silk_LPC_analysis_filter( res, x_buf, A_Q12, 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_Q13 = SILK_FIX_CONST( 0.6, 13 );
+ thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder );
+ thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 21 ), psEnc->sCmn.speech_activity_Q8 );
+ thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15, 13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
+ thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 14 ), psEnc->sCmn.input_tilt_Q15 );
+ thrhld_Q13 = silk_SAT16( thrhld_Q13 );
+
+ /*****************************************/
+ /* Call pitch estimator */
+ /*****************************************/
+ if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
+ &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
+ (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
+ psEnc->sCmn.arch) == 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_Q15 = 0;
+ }
+ RESTORE_STACK;
+}
generated by cgit (git 2.34.1) at 2024-11-15 09:19:16 +0000