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comparison: media/libopus/silk/float/find_LTP_FLP.c
media/libopus/silk/float/find_LTP_FLP.c
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:10fcf3ec9a9a |
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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_FLP.h" | |
| 33 #include "tuning_parameters.h" | |
| 34 | |
| 35 void silk_find_LTP_FLP( | |
| 36 silk_float b[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */ | |
| 37 silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */ | |
| 38 silk_float *LTPredCodGain, /* O LTP coding gain */ | |
| 39 const silk_float r_lpc[], /* I LPC residual */ | |
| 40 const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */ | |
| 41 const silk_float Wght[ MAX_NB_SUBFR ], /* I Weights */ | |
| 42 const opus_int subfr_length, /* I Subframe length */ | |
| 43 const opus_int nb_subfr, /* I number of subframes */ | |
| 44 const opus_int mem_offset /* I Number of samples in LTP memory */ | |
| 45 ) | |
| 46 { | |
| 47 opus_int i, k; | |
| 48 silk_float *b_ptr, temp, *WLTP_ptr; | |
| 49 silk_float LPC_res_nrg, LPC_LTP_res_nrg; | |
| 50 silk_float d[ MAX_NB_SUBFR ], m, g, delta_b[ LTP_ORDER ]; | |
| 51 silk_float w[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], regu; | |
| 52 silk_float Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ]; | |
| 53 const silk_float *r_ptr, *lag_ptr; | |
| 54 | |
| 55 b_ptr = b; | |
| 56 WLTP_ptr = WLTP; | |
| 57 r_ptr = &r_lpc[ mem_offset ]; | |
| 58 for( k = 0; k < nb_subfr; k++ ) { | |
| 59 lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 ); | |
| 60 | |
| 61 silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, WLTP_ptr ); | |
| 62 silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr ); | |
| 63 | |
| 64 rr[ k ] = ( silk_float )silk_energy_FLP( r_ptr, subfr_length ); | |
| 65 regu = 1.0f + rr[ k ] + | |
| 66 matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ) + | |
| 67 matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER ); | |
| 68 regu *= LTP_DAMPING / 3; | |
| 69 silk_regularize_correlations_FLP( WLTP_ptr, &rr[ k ], regu, LTP_ORDER ); | |
| 70 silk_solve_LDL_FLP( WLTP_ptr, LTP_ORDER, Rr, b_ptr ); | |
| 71 | |
| 72 /* Calculate residual energy */ | |
| 73 nrg[ k ] = silk_residual_energy_covar_FLP( b_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER ); | |
| 74 | |
| 75 temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length ); | |
| 76 silk_scale_vector_FLP( WLTP_ptr, temp, LTP_ORDER * LTP_ORDER ); | |
| 77 w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER / 2, LTP_ORDER / 2, LTP_ORDER ); | |
| 78 | |
| 79 r_ptr += subfr_length; | |
| 80 b_ptr += LTP_ORDER; | |
| 81 WLTP_ptr += LTP_ORDER * LTP_ORDER; | |
| 82 } | |
| 83 | |
| 84 /* Compute LTP coding gain */ | |
| 85 if( LTPredCodGain != NULL ) { | |
| 86 LPC_LTP_res_nrg = 1e-6f; | |
| 87 LPC_res_nrg = 0.0f; | |
| 88 for( k = 0; k < nb_subfr; k++ ) { | |
| 89 LPC_res_nrg += rr[ k ] * Wght[ k ]; | |
| 90 LPC_LTP_res_nrg += nrg[ k ] * Wght[ k ]; | |
| 91 } | |
| 92 | |
| 93 silk_assert( LPC_LTP_res_nrg > 0 ); | |
| 94 *LTPredCodGain = 3.0f * silk_log2( LPC_res_nrg / LPC_LTP_res_nrg ); | |
| 95 } | |
| 96 | |
| 97 /* Smoothing */ | |
| 98 /* d = sum( B, 1 ); */ | |
| 99 b_ptr = b; | |
| 100 for( k = 0; k < nb_subfr; k++ ) { | |
| 101 d[ k ] = 0; | |
| 102 for( i = 0; i < LTP_ORDER; i++ ) { | |
| 103 d[ k ] += b_ptr[ i ]; | |
| 104 } | |
| 105 b_ptr += LTP_ORDER; | |
| 106 } | |
| 107 /* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */ | |
| 108 temp = 1e-3f; | |
| 109 for( k = 0; k < nb_subfr; k++ ) { | |
| 110 temp += w[ k ]; | |
| 111 } | |
| 112 m = 0; | |
| 113 for( k = 0; k < nb_subfr; k++ ) { | |
| 114 m += d[ k ] * w[ k ]; | |
| 115 } | |
| 116 m = m / temp; | |
| 117 | |
| 118 b_ptr = b; | |
| 119 for( k = 0; k < nb_subfr; k++ ) { | |
| 120 g = LTP_SMOOTHING / ( LTP_SMOOTHING + w[ k ] ) * ( m - d[ k ] ); | |
| 121 temp = 0; | |
| 122 for( i = 0; i < LTP_ORDER; i++ ) { | |
| 123 delta_b[ i ] = silk_max_float( b_ptr[ i ], 0.1f ); | |
| 124 temp += delta_b[ i ]; | |
| 125 } | |
| 126 temp = g / temp; | |
| 127 for( i = 0; i < LTP_ORDER; i++ ) { | |
| 128 b_ptr[ i ] = b_ptr[ i ] + delta_b[ i ] * temp; | |
| 129 } | |
| 130 b_ptr += LTP_ORDER; | |
| 131 } | |
| 132 } |
