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media/libopus/silk/fixed/find_pred_coefs_FIX.c@6474c204b198 (annotated)

media/libopus/silk/fixed/find_pred_coefs_FIX.c

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1 /***********************************************************************
michael@0 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0 3 Redistribution and use in source and binary forms, with or without
michael@0 4 modification, are permitted provided that the following conditions
michael@0 5 are met:
michael@0 6 - Redistributions of source code must retain the above copyright notice,
michael@0 7 this list of conditions and the following disclaimer.
michael@0 8 - Redistributions in binary form must reproduce the above copyright
michael@0 9 notice, this list of conditions and the following disclaimer in the
michael@0 10 documentation and/or other materials provided with the distribution.
michael@0 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0 12 names of specific contributors, may be used to endorse or promote
michael@0 13 products derived from this software without specific prior written
michael@0 14 permission.
michael@0 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0 25 POSSIBILITY OF SUCH DAMAGE.
michael@0 26 ***********************************************************************/
michael@0 27
michael@0 28 #ifdef HAVE_CONFIG_H
michael@0 29 #include "config.h"
michael@0 30 #endif
michael@0 31
michael@0 32 #include "main_FIX.h"
michael@0 33 #include "stack_alloc.h"
michael@0 34
michael@0 35 void silk_find_pred_coefs_FIX(
michael@0 36 silk_encoder_state_FIX *psEnc, /* I/O encoder state */
michael@0 37 silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
michael@0 38 const opus_int16 res_pitch[], /* I Residual from pitch analysis */
michael@0 39 const opus_int16 x[], /* I Speech signal */
michael@0 40 opus_int condCoding /* I The type of conditional coding to use */
michael@0 41 )
michael@0 42 {
michael@0 43 opus_int i;
michael@0 44 opus_int32 invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ];
michael@0 45 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
michael@0 46 const opus_int16 *x_ptr;
michael@0 47 opus_int16 *x_pre_ptr;
michael@0 48 VARDECL( opus_int16, LPC_in_pre );
michael@0 49 opus_int32 tmp, min_gain_Q16, minInvGain_Q30;
michael@0 50 opus_int LTP_corrs_rshift[ MAX_NB_SUBFR ];
michael@0 51 SAVE_STACK;
michael@0 52
michael@0 53 /* weighting for weighted least squares */
michael@0 54 min_gain_Q16 = silk_int32_MAX >> 6;
michael@0 55 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
michael@0 56 min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] );
michael@0 57 }
michael@0 58 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
michael@0 59 /* Divide to Q16 */
michael@0 60 silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 );
michael@0 61 /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */
michael@0 62 invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 );
michael@0 63
michael@0 64 /* Ensure Wght_Q15 a minimum value 1 */
michael@0 65 invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 );
michael@0 66
michael@0 67 /* Square the inverted gains */
michael@0 68 silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) );
michael@0 69 tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] );
michael@0 70 Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 );
michael@0 71
michael@0 72 /* Invert the inverted and normalized gains */
michael@0 73 local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] );
michael@0 74 }
michael@0 75
michael@0 76 ALLOC( LPC_in_pre,
michael@0 77 psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder
michael@0 78 + psEnc->sCmn.frame_length, opus_int16 );
michael@0 79 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
michael@0 80 VARDECL( opus_int32, WLTP );
michael@0 81
michael@0 82 /**********/
michael@0 83 /* VOICED */
michael@0 84 /**********/
michael@0 85 silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
michael@0 86
michael@0 87 ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 );
michael@0 88
michael@0 89 /* LTP analysis */
michael@0 90 silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7,
michael@0 91 res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length,
michael@0 92 psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift );
michael@0 93
michael@0 94 /* Quantize LTP gain parameters */
michael@0 95 silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
michael@0 96 &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr);
michael@0 97
michael@0 98 /* Control LTP scaling */
michael@0 99 silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding );
michael@0 100
michael@0 101 /* Create LTP residual */
michael@0 102 silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14,
michael@0 103 psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
michael@0 104
michael@0 105 } else {
michael@0 106 /************/
michael@0 107 /* UNVOICED */
michael@0 108 /************/
michael@0 109 /* Create signal with prepended subframes, scaled by inverse gains */
michael@0 110 x_ptr = x - psEnc->sCmn.predictLPCOrder;
michael@0 111 x_pre_ptr = LPC_in_pre;
michael@0 112 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
michael@0 113 silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ],
michael@0 114 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
michael@0 115 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
michael@0 116 x_ptr += psEnc->sCmn.subfr_length;
michael@0 117 }
michael@0 118
michael@0 119 silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) );
michael@0 120 psEncCtrl->LTPredCodGain_Q7 = 0;
michael@0 121 psEnc->sCmn.sum_log_gain_Q7 = 0;
michael@0 122 }
michael@0 123
michael@0 124 /* Limit on total predictive coding gain */
michael@0 125 if( psEnc->sCmn.first_frame_after_reset ) {
michael@0 126 minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 );
michael@0 127 } else {
michael@0 128 minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) ); /* Q16 */
michael@0 129 minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30,
michael@0 130 silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ),
michael@0 131 silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 );
michael@0 132 }
michael@0 133
michael@0 134 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
michael@0 135 silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 );
michael@0 136
michael@0 137 /* Quantize LSFs */
michael@0 138 silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
michael@0 139
michael@0 140 /* Calculate residual energy using quantized LPC coefficients */
michael@0 141 silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains,
michael@0 142 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
michael@0 143
michael@0 144 /* Copy to prediction struct for use in next frame for interpolation */
michael@0 145 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
michael@0 146 RESTORE_STACK;
michael@0 147 }

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