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comparison: media/libopus/silk/float/find_pitch_lags_FLP.c
media/libopus/silk/float/find_pitch_lags_FLP.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:c69190489adc |
|---|---|
| 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 <stdlib.h> | |
| 33 #include "main_FLP.h" | |
| 34 #include "tuning_parameters.h" | |
| 35 | |
| 36 void silk_find_pitch_lags_FLP( | |
| 37 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ | |
| 38 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ | |
| 39 silk_float res[], /* O Residual */ | |
| 40 const silk_float x[], /* I Speech signal */ | |
| 41 int arch /* I Run-time architecture */ | |
| 42 ) | |
| 43 { | |
| 44 opus_int buf_len; | |
| 45 silk_float thrhld, res_nrg; | |
| 46 const silk_float *x_buf_ptr, *x_buf; | |
| 47 silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ]; | |
| 48 silk_float A[ MAX_FIND_PITCH_LPC_ORDER ]; | |
| 49 silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ]; | |
| 50 silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ]; | |
| 51 silk_float *Wsig_ptr; | |
| 52 | |
| 53 /******************************************/ | |
| 54 /* Set up buffer lengths etc based on Fs */ | |
| 55 /******************************************/ | |
| 56 buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length; | |
| 57 | |
| 58 /* Safety check */ | |
| 59 silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length ); | |
| 60 | |
| 61 x_buf = x - psEnc->sCmn.ltp_mem_length; | |
| 62 | |
| 63 /******************************************/ | |
| 64 /* Estimate LPC AR coeficients */ | |
| 65 /******************************************/ | |
| 66 | |
| 67 /* Calculate windowed signal */ | |
| 68 | |
| 69 /* First LA_LTP samples */ | |
| 70 x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length; | |
| 71 Wsig_ptr = Wsig; | |
| 72 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch ); | |
| 73 | |
| 74 /* Middle non-windowed samples */ | |
| 75 Wsig_ptr += psEnc->sCmn.la_pitch; | |
| 76 x_buf_ptr += psEnc->sCmn.la_pitch; | |
| 77 silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) ); | |
| 78 | |
| 79 /* Last LA_LTP samples */ | |
| 80 Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); | |
| 81 x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); | |
| 82 silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch ); | |
| 83 | |
| 84 /* Calculate autocorrelation sequence */ | |
| 85 silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 ); | |
| 86 | |
| 87 /* Add white noise, as a fraction of the energy */ | |
| 88 auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1; | |
| 89 | |
| 90 /* Calculate the reflection coefficients using Schur */ | |
| 91 res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 92 | |
| 93 /* Prediction gain */ | |
| 94 psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f ); | |
| 95 | |
| 96 /* Convert reflection coefficients to prediction coefficients */ | |
| 97 silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 98 | |
| 99 /* Bandwidth expansion */ | |
| 100 silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION ); | |
| 101 | |
| 102 /*****************************************/ | |
| 103 /* LPC analysis filtering */ | |
| 104 /*****************************************/ | |
| 105 silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder ); | |
| 106 | |
| 107 if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) { | |
| 108 /* Threshold for pitch estimator */ | |
| 109 thrhld = 0.6f; | |
| 110 thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder; | |
| 111 thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); | |
| 112 thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1); | |
| 113 thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ); | |
| 114 | |
| 115 /*****************************************/ | |
| 116 /* Call Pitch estimator */ | |
| 117 /*****************************************/ | |
| 118 if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, | |
| 119 &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f, | |
| 120 thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 ) | |
| 121 { | |
| 122 psEnc->sCmn.indices.signalType = TYPE_VOICED; | |
| 123 } else { | |
| 124 psEnc->sCmn.indices.signalType = TYPE_UNVOICED; | |
| 125 } | |
| 126 } else { | |
| 127 silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) ); | |
| 128 psEnc->sCmn.indices.lagIndex = 0; | |
| 129 psEnc->sCmn.indices.contourIndex = 0; | |
| 130 psEnc->LTPCorr = 0; | |
| 131 } | |
| 132 } |
