| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| - Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| names of specific contributors, may be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. |
| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main_FIX.h" |
| #include "stack_alloc.h" |
| |
| void silk_find_pred_coefs_FIX( |
| silk_encoder_state_FIX *psEnc, /* I/O encoder state */ |
| silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */ |
| const opus_int16 res_pitch[], /* I Residual from pitch analysis */ |
| const opus_int16 x[], /* I Speech signal */ |
| opus_int condCoding /* I The type of conditional coding to use */ |
| ) |
| { |
| opus_int i; |
| opus_int32 invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ]; |
| opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; |
| const opus_int16 *x_ptr; |
| opus_int16 *x_pre_ptr; |
| VARDECL( opus_int16, LPC_in_pre ); |
| opus_int32 tmp, min_gain_Q16, minInvGain_Q30; |
| opus_int LTP_corrs_rshift[ MAX_NB_SUBFR ]; |
| SAVE_STACK; |
| |
| /* weighting for weighted least squares */ |
| min_gain_Q16 = silk_int32_MAX >> 6; |
| for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { |
| min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] ); |
| } |
| for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { |
| /* Divide to Q16 */ |
| silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 ); |
| /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */ |
| invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 ); |
| |
| /* Ensure Wght_Q15 a minimum value 1 */ |
| invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 ); |
| |
| /* Square the inverted gains */ |
| silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) ); |
| tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] ); |
| Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 ); |
| |
| /* Invert the inverted and normalized gains */ |
| local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] ); |
| } |
| |
| ALLOC( LPC_in_pre, |
| psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder |
| + psEnc->sCmn.frame_length, opus_int16 ); |
| if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| VARDECL( opus_int32, WLTP ); |
| |
| /**********/ |
| /* VOICED */ |
| /**********/ |
| silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); |
| |
| ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 ); |
| |
| /* LTP analysis */ |
| silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7, |
| res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length, |
| psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift, psEnc->sCmn.arch ); |
| |
| /* Quantize LTP gain parameters */ |
| silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, |
| &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr, |
| psEnc->sCmn.arch); |
| |
| /* Control LTP scaling */ |
| silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding ); |
| |
| /* Create LTP residual */ |
| silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14, |
| psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); |
| |
| } else { |
| /************/ |
| /* UNVOICED */ |
| /************/ |
| /* Create signal with prepended subframes, scaled by inverse gains */ |
| x_ptr = x - psEnc->sCmn.predictLPCOrder; |
| x_pre_ptr = LPC_in_pre; |
| for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { |
| silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ], |
| psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); |
| x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; |
| x_ptr += psEnc->sCmn.subfr_length; |
| } |
| |
| silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) ); |
| psEncCtrl->LTPredCodGain_Q7 = 0; |
| psEnc->sCmn.sum_log_gain_Q7 = 0; |
| } |
| |
| /* Limit on total predictive coding gain */ |
| if( psEnc->sCmn.first_frame_after_reset ) { |
| minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 ); |
| } else { |
| minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) ); /* Q16 */ |
| minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30, |
| silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ), |
| silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 ); |
| } |
| |
| /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ |
| silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 ); |
| |
| /* Quantize LSFs */ |
| silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); |
| |
| /* Calculate residual energy using quantized LPC coefficients */ |
| silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains, |
| psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.arch ); |
| |
| /* Copy to prediction struct for use in next frame for interpolation */ |
| silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); |
| RESTORE_STACK; |
| } |