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comparison: media/libopus/silk/fixed/find_pitch_lags_FIX.c
media/libopus/silk/fixed/find_pitch_lags_FIX.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:a4d9bcdd80ca |
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| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "main_FIX.h" | |
| 33 #include "stack_alloc.h" | |
| 34 #include "tuning_parameters.h" | |
| 35 | |
| 36 /* Find pitch lags */ | |
| 37 void silk_find_pitch_lags_FIX( | |
| 38 silk_encoder_state_FIX *psEnc, /* I/O encoder state */ | |
| 39 silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */ | |
| 40 opus_int16 res[], /* O residual */ | |
| 41 const opus_int16 x[], /* I Speech signal */ | |
| 42 int arch /* I Run-time architecture */ | |
| 43 ) | |
| 44 { | |
| 45 opus_int buf_len, i, scale; | |
| 46 opus_int32 thrhld_Q13, res_nrg; | |
| 47 const opus_int16 *x_buf, *x_buf_ptr; | |
| 48 VARDECL( opus_int16, Wsig ); | |
| 49 opus_int16 *Wsig_ptr; | |
| 50 opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ]; | |
| 51 opus_int16 rc_Q15[ MAX_FIND_PITCH_LPC_ORDER ]; | |
| 52 opus_int32 A_Q24[ MAX_FIND_PITCH_LPC_ORDER ]; | |
| 53 opus_int16 A_Q12[ MAX_FIND_PITCH_LPC_ORDER ]; | |
| 54 SAVE_STACK; | |
| 55 | |
| 56 /******************************************/ | |
| 57 /* Set up buffer lengths etc based on Fs */ | |
| 58 /******************************************/ | |
| 59 buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length; | |
| 60 | |
| 61 /* Safety check */ | |
| 62 silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length ); | |
| 63 | |
| 64 x_buf = x - psEnc->sCmn.ltp_mem_length; | |
| 65 | |
| 66 /*************************************/ | |
| 67 /* Estimate LPC AR coefficients */ | |
| 68 /*************************************/ | |
| 69 | |
| 70 /* Calculate windowed signal */ | |
| 71 | |
| 72 ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 ); | |
| 73 | |
| 74 /* First LA_LTP samples */ | |
| 75 x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length; | |
| 76 Wsig_ptr = Wsig; | |
| 77 silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch ); | |
| 78 | |
| 79 /* Middle un - windowed samples */ | |
| 80 Wsig_ptr += psEnc->sCmn.la_pitch; | |
| 81 x_buf_ptr += psEnc->sCmn.la_pitch; | |
| 82 silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) ); | |
| 83 | |
| 84 /* Last LA_LTP samples */ | |
| 85 Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ); | |
| 86 x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ); | |
| 87 silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch ); | |
| 88 | |
| 89 /* Calculate autocorrelation sequence */ | |
| 90 silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch ); | |
| 91 | |
| 92 /* Add white noise, as fraction of energy */ | |
| 93 auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1; | |
| 94 | |
| 95 /* Calculate the reflection coefficients using schur */ | |
| 96 res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 97 | |
| 98 /* Prediction gain */ | |
| 99 psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 ); | |
| 100 | |
| 101 /* Convert reflection coefficients to prediction coefficients */ | |
| 102 silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 103 | |
| 104 /* Convert From 32 bit Q24 to 16 bit Q12 coefs */ | |
| 105 for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) { | |
| 106 A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) ); | |
| 107 } | |
| 108 | |
| 109 /* Do BWE */ | |
| 110 silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) ); | |
| 111 | |
| 112 /*****************************************/ | |
| 113 /* LPC analysis filtering */ | |
| 114 /*****************************************/ | |
| 115 silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 116 | |
| 117 if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) { | |
| 118 /* Threshold for pitch estimator */ | |
| 119 thrhld_Q13 = SILK_FIX_CONST( 0.6, 13 ); | |
| 120 thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 121 thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 21 ), psEnc->sCmn.speech_activity_Q8 ); | |
| 122 thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15, 13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) ); | |
| 123 thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1, 14 ), psEnc->sCmn.input_tilt_Q15 ); | |
| 124 thrhld_Q13 = silk_SAT16( thrhld_Q13 ); | |
| 125 | |
| 126 /*****************************************/ | |
| 127 /* Call pitch estimator */ | |
| 128 /*****************************************/ | |
| 129 if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex, | |
| 130 &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16, | |
| 131 (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, | |
| 132 psEnc->sCmn.arch) == 0 ) | |
| 133 { | |
| 134 psEnc->sCmn.indices.signalType = TYPE_VOICED; | |
| 135 } else { | |
| 136 psEnc->sCmn.indices.signalType = TYPE_UNVOICED; | |
| 137 } | |
| 138 } else { | |
| 139 silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) ); | |
| 140 psEnc->sCmn.indices.lagIndex = 0; | |
| 141 psEnc->sCmn.indices.contourIndex = 0; | |
| 142 psEnc->LTPCorr_Q15 = 0; | |
| 143 } | |
| 144 RESTORE_STACK; | |
| 145 } |
