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comparison: media/libopus/silk/float/find_pred_coefs_FLP.c
media/libopus/silk/float/find_pred_coefs_FLP.c
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:a4ace755f848 |
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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 | |
| 34 /* Find LPC and LTP coefficients */ | |
| 35 void silk_find_pred_coefs_FLP( | |
| 36 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ | |
| 37 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ | |
| 38 const silk_float res_pitch[], /* I Residual from pitch analysis */ | |
| 39 const silk_float x[], /* I Speech signal */ | |
| 40 opus_int condCoding /* I The type of conditional coding to use */ | |
| 41 ) | |
| 42 { | |
| 43 opus_int i; | |
| 44 silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ]; | |
| 45 silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ]; | |
| 46 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; | |
| 47 const silk_float *x_ptr; | |
| 48 silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ]; | |
| 49 silk_float minInvGain; | |
| 50 | |
| 51 /* Weighting for weighted least squares */ | |
| 52 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { | |
| 53 silk_assert( psEncCtrl->Gains[ i ] > 0.0f ); | |
| 54 invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ]; | |
| 55 Wght[ i ] = invGains[ i ] * invGains[ i ]; | |
| 56 } | |
| 57 | |
| 58 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { | |
| 59 /**********/ | |
| 60 /* VOICED */ | |
| 61 /**********/ | |
| 62 silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); | |
| 63 | |
| 64 /* LTP analysis */ | |
| 65 silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch, | |
| 66 psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length ); | |
| 67 | |
| 68 /* Quantize LTP gain parameters */ | |
| 69 silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, | |
| 70 &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr ); | |
| 71 | |
| 72 /* Control LTP scaling */ | |
| 73 silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding ); | |
| 74 | |
| 75 /* Create LTP residual */ | |
| 76 silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef, | |
| 77 psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); | |
| 78 } else { | |
| 79 /************/ | |
| 80 /* UNVOICED */ | |
| 81 /************/ | |
| 82 /* Create signal with prepended subframes, scaled by inverse gains */ | |
| 83 x_ptr = x - psEnc->sCmn.predictLPCOrder; | |
| 84 x_pre_ptr = LPC_in_pre; | |
| 85 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { | |
| 86 silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ], | |
| 87 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); | |
| 88 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; | |
| 89 x_ptr += psEnc->sCmn.subfr_length; | |
| 90 } | |
| 91 silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) ); | |
| 92 psEncCtrl->LTPredCodGain = 0.0f; | |
| 93 psEnc->sCmn.sum_log_gain_Q7 = 0; | |
| 94 } | |
| 95 | |
| 96 /* Limit on total predictive coding gain */ | |
| 97 if( psEnc->sCmn.first_frame_after_reset ) { | |
| 98 minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET; | |
| 99 } else { | |
| 100 minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN; | |
| 101 minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality; | |
| 102 } | |
| 103 | |
| 104 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ | |
| 105 silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain ); | |
| 106 | |
| 107 /* Quantize LSFs */ | |
| 108 silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); | |
| 109 | |
| 110 /* Calculate residual energy using quantized LPC coefficients */ | |
| 111 silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains, | |
| 112 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); | |
| 113 | |
| 114 /* Copy to prediction struct for use in next frame for interpolation */ | |
| 115 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); | |
| 116 } | |
| 117 |
