/* Generates excitation for CNG LPC synthesis */ SKP_INLINE void SKP_Silk_CNG_exc( SKP_int16 residual[], /* O CNG residual signal Q0 */ SKP_int32 exc_buf_Q10[], /* I Random samples buffer Q10 */ SKP_int32 Gain_Q16, /* I Gain to apply */ SKP_int length, /* I Length */ SKP_int32 *rand_seed /* I/O Seed to random index generator */ ) { SKP_int32 seed; SKP_int i, idx, exc_mask; exc_mask = CNG_BUF_MASK_MAX; while( exc_mask > length ) { exc_mask = SKP_RSHIFT( exc_mask, 1 ); } seed = *rand_seed; for( i = 0; i < length; i++ ) { seed = SKP_RAND( seed ); idx = ( SKP_int )( SKP_RSHIFT( seed, 24 ) & exc_mask ); SKP_assert( idx >= 0 ); SKP_assert( idx <= CNG_BUF_MASK_MAX ); residual[ i ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND( SKP_SMULWW( exc_buf_Q10[ idx ], Gain_Q16 ), 10 ) ); } *rand_seed = seed; }
/* Processing of gains */ void silk_process_gains_FIX( silk_encoder_state_FIX *psEnc, /* I/O Encoder state_FIX */ silk_encoder_control_FIX *psEncCtrl /* I/O Encoder control_FIX */ ) { silk_shape_state_FIX *psShapeSt = &psEnc->sShape; opus_int k; opus_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10; /* Gain reduction when LTP coding gain is high */ if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { /*s = -0.5f * SKP_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */ s_Q16 = -silk_sigm_Q15( SKP_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) ); for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { psEncCtrl->Gains_Q16[ k ] = SKP_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 ); } } /* Limit the quantized signal */ /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */ InvMaxSqrVal_Q16 = SKP_DIV32_16( silk_log2lin( SKP_SMULWB( SILK_FIX_CONST( 21 + 16 / 0.33, 7 ) - psEnc->sCmn.SNR_dB_Q7, SILK_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length ); for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { /* Soft limit on ratio residual energy and squared gains */ ResNrg = psEncCtrl->ResNrg[ k ]; ResNrgPart = SKP_SMULWW( ResNrg, InvMaxSqrVal_Q16 ); if( psEncCtrl->ResNrgQ[ k ] > 0 ) { ResNrgPart = SKP_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] ); } else { if( ResNrgPart >= SKP_RSHIFT( SKP_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) { ResNrgPart = SKP_int32_MAX; } else { ResNrgPart = SKP_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] ); } } gain = psEncCtrl->Gains_Q16[ k ]; gain_squared = SKP_ADD_SAT32( ResNrgPart, SKP_SMMUL( gain, gain ) ); if( gain_squared < SKP_int16_MAX ) { /* recalculate with higher precision */ gain_squared = SKP_SMLAWW( SKP_LSHIFT( ResNrgPart, 16 ), gain, gain ); SKP_assert( gain_squared > 0 ); gain = silk_SQRT_APPROX( gain_squared ); /* Q8 */ gain = SKP_min( gain, SKP_int32_MAX >> 8 ); psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( gain, 8 ); /* Q16 */ } else {
SKP_INLINE void SKP_Silk_LS_divide_Q16_FIX( SKP_int32 T[], /* I/O Numenator vector */ inv_D_t *inv_D, /* I 1 / D vector */ SKP_int M /* I Order */ ) { SKP_int i; SKP_int32 tmp_32; SKP_int32 one_div_diag_Q36, one_div_diag_Q48; for( i = 0; i < M; i++ ) { one_div_diag_Q36 = inv_D[ i ].Q36_part; one_div_diag_Q48 = inv_D[ i ].Q48_part; tmp_32 = T[ i ]; T[ i ] = SKP_ADD32( SKP_SMMUL( tmp_32, one_div_diag_Q48 ), SKP_RSHIFT( SKP_SMULWW( tmp_32, one_div_diag_Q36 ), 4 ) ); } }
/* amplitude of monic warped coefficients by using bandwidth expansion on the true coefficients */ SKP_INLINE void limit_warped_coefs( SKP_int32 *coefs_syn_Q24, SKP_int32 *coefs_ana_Q24, SKP_int lambda_Q16, SKP_int32 limit_Q24, SKP_int order ) { SKP_int i, iter, ind = 0; SKP_int32 tmp, maxabs_Q24, chirp_Q16, gain_syn_Q16, gain_ana_Q16; SKP_int32 nom_Q16, den_Q24; /* Convert to monic coefficients */ lambda_Q16 = -lambda_Q16; for( i = order - 1; i > 0; i-- ) { coefs_syn_Q24[ i - 1 ] = SKP_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); coefs_ana_Q24[ i - 1 ] = SKP_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); } lambda_Q16 = -lambda_Q16; nom_Q16 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 16 ), -lambda_Q16, lambda_Q16 ); den_Q24 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 ); gain_syn_Q16 = SKP_DIV32_varQ( nom_Q16, den_Q24, 24 ); den_Q24 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 ); gain_ana_Q16 = SKP_DIV32_varQ( nom_Q16, den_Q24, 24 ); for( i = 0; i < order; i++ ) { coefs_syn_Q24[ i ] = SKP_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); coefs_ana_Q24[ i ] = SKP_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); } for( iter = 0; iter < 10; iter++ ) { /* Find maximum absolute value */ maxabs_Q24 = -1; for( i = 0; i < order; i++ ) { tmp = SKP_max( SKP_abs_int32( coefs_syn_Q24[ i ] ), SKP_abs_int32( coefs_ana_Q24[ i ] ) ); if( tmp > maxabs_Q24 ) { maxabs_Q24 = tmp; ind = i; } } if( maxabs_Q24 <= limit_Q24 ) { /* Coefficients are within range - done */ return; } /* Convert back to true warped coefficients */ for( i = 1; i < order; i++ ) { coefs_syn_Q24[ i - 1 ] = SKP_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); coefs_ana_Q24[ i - 1 ] = SKP_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); } gain_syn_Q16 = SKP_INVERSE32_varQ( gain_syn_Q16, 32 ); gain_ana_Q16 = SKP_INVERSE32_varQ( gain_ana_Q16, 32 ); for( i = 0; i < order; i++ ) { coefs_syn_Q24[ i ] = SKP_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); coefs_ana_Q24[ i ] = SKP_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); } /* Apply bandwidth expansion */ chirp_Q16 = SKP_FIX_CONST( 0.99, 16 ) - SKP_DIV32_varQ( SKP_SMULWB( maxabs_Q24 - limit_Q24, SKP_SMLABB( SKP_FIX_CONST( 0.8, 10 ), SKP_FIX_CONST( 0.1, 10 ), iter ) ), SKP_MUL( maxabs_Q24, ind + 1 ), 22 ); SKP_Silk_bwexpander_32( coefs_syn_Q24, order, chirp_Q16 ); SKP_Silk_bwexpander_32( coefs_ana_Q24, order, chirp_Q16 ); /* Convert to monic warped coefficients */ lambda_Q16 = -lambda_Q16; for( i = order - 1; i > 0; i-- ) { coefs_syn_Q24[ i - 1 ] = SKP_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 ); coefs_ana_Q24[ i - 1 ] = SKP_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 ); } lambda_Q16 = -lambda_Q16; nom_Q16 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 16 ), -lambda_Q16, lambda_Q16 ); den_Q24 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 ); gain_syn_Q16 = SKP_DIV32_varQ( nom_Q16, den_Q24, 24 ); den_Q24 = SKP_SMLAWB( SKP_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 ); gain_ana_Q16 = SKP_DIV32_varQ( nom_Q16, den_Q24, 24 ); for( i = 0; i < order; i++ ) { coefs_syn_Q24[ i ] = SKP_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] ); coefs_ana_Q24[ i ] = SKP_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] ); } } SKP_assert( 0 ); }
/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */ void SKP_Silk_HP_variable_cutoff_FIX( SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */ SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control FIX */ SKP_int16 *out, /* O high-pass filtered output signal */ const SKP_int16 *in /* I input signal */ ) { SKP_int quality_Q15; SKP_int32 B_Q28[ 3 ], A_Q28[ 2 ]; SKP_int32 Fc_Q19, r_Q28, r_Q22; SKP_int32 pitch_freq_Hz_Q16, pitch_freq_log_Q7, delta_freq_Q7; /*********************************************/ /* Estimate Low End of Pitch Frequency Range */ /*********************************************/ if( psEnc->sCmn.prev_sigtype == SIG_TYPE_VOICED ) { /* difference, in log domain */ pitch_freq_Hz_Q16 = SKP_DIV32_16( SKP_LSHIFT( SKP_MUL( psEnc->sCmn.fs_kHz, 1000 ), 16 ), psEnc->sCmn.prevLag ); pitch_freq_log_Q7 = SKP_Silk_lin2log( pitch_freq_Hz_Q16 ) - ( 16 << 7 ); //0x70 /* adjustment based on quality */ quality_Q15 = psEncCtrl->input_quality_bands_Q15[ 0 ]; pitch_freq_log_Q7 = SKP_SUB32( pitch_freq_log_Q7, SKP_SMULWB( SKP_SMULWB( SKP_LSHIFT( quality_Q15, 2 ), quality_Q15 ), pitch_freq_log_Q7 - SKP_LOG2_VARIABLE_HP_MIN_FREQ_Q7 ) ); pitch_freq_log_Q7 = SKP_ADD32( pitch_freq_log_Q7, SKP_RSHIFT( SKP_FIX_CONST( 0.6, 15 ) - quality_Q15, 9 ) ); //delta_freq = pitch_freq_log - psEnc->variable_HP_smth1; delta_freq_Q7 = pitch_freq_log_Q7 - SKP_RSHIFT( psEnc->variable_HP_smth1_Q15, 8 ); if( delta_freq_Q7 < 0 ) { /* less smoothing for decreasing pitch frequency, to track something close to the minimum */ delta_freq_Q7 = SKP_MUL( delta_freq_Q7, 3 ); } /* limit delta, to reduce impact of outliers */ delta_freq_Q7 = SKP_LIMIT_32( delta_freq_Q7, -SKP_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ), SKP_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ) ); /* update smoother */ psEnc->variable_HP_smth1_Q15 = SKP_SMLAWB( psEnc->variable_HP_smth1_Q15, SKP_MUL( SKP_LSHIFT( psEnc->speech_activity_Q8, 1 ), delta_freq_Q7 ), SKP_FIX_CONST( VARIABLE_HP_SMTH_COEF1, 16 ) ); } /* second smoother */ psEnc->variable_HP_smth2_Q15 = SKP_SMLAWB( psEnc->variable_HP_smth2_Q15, psEnc->variable_HP_smth1_Q15 - psEnc->variable_HP_smth2_Q15, SKP_FIX_CONST( VARIABLE_HP_SMTH_COEF2, 16 ) ); /* convert from log scale to Hertz */ psEncCtrl->pitch_freq_low_Hz = SKP_Silk_log2lin( SKP_RSHIFT( psEnc->variable_HP_smth2_Q15, 8 ) ); /* limit frequency range */ psEncCtrl->pitch_freq_low_Hz = SKP_LIMIT_32( psEncCtrl->pitch_freq_low_Hz, SKP_FIX_CONST( VARIABLE_HP_MIN_FREQ, 0 ), SKP_FIX_CONST( VARIABLE_HP_MAX_FREQ, 0 ) ); /********************************/ /* Compute Filter Coefficients */ /********************************/ /* compute cut-off frequency, in radians */ //Fc_num = (SKP_float)( 0.45f * 2.0f * 3.14159265359 * psEncCtrl->pitch_freq_low_Hz ); //Fc_denom = (SKP_float)( 1e3f * psEnc->sCmn.fs_kHz ); SKP_assert( psEncCtrl->pitch_freq_low_Hz <= SKP_int32_MAX / SKP_RADIANS_CONSTANT_Q19 ); Fc_Q19 = SKP_DIV32_16( SKP_SMULBB( SKP_RADIANS_CONSTANT_Q19, psEncCtrl->pitch_freq_low_Hz ), psEnc->sCmn.fs_kHz ); // range: 3704 - 27787, 11-15 bits SKP_assert( Fc_Q19 >= 3704 ); SKP_assert( Fc_Q19 <= 27787 ); r_Q28 = SKP_FIX_CONST( 1.0, 28 ) - SKP_MUL( SKP_FIX_CONST( 0.92, 9 ), Fc_Q19 ); SKP_assert( r_Q28 >= 255347779 ); SKP_assert( r_Q28 <= 266690872 ); /* b = r * [ 1; -2; 1 ]; */ /* a = [ 1; -2 * r * ( 1 - 0.5 * Fc^2 ); r^2 ]; */ B_Q28[ 0 ] = r_Q28; B_Q28[ 1 ] = SKP_LSHIFT( -r_Q28, 1 ); B_Q28[ 2 ] = r_Q28; // -r * ( 2 - Fc * Fc ); r_Q22 = SKP_RSHIFT( r_Q28, 6 ); A_Q28[ 0 ] = SKP_SMULWW( r_Q22, SKP_SMULWW( Fc_Q19, Fc_Q19 ) - SKP_FIX_CONST( 2.0, 22 ) ); A_Q28[ 1 ] = SKP_SMULWW( r_Q22, r_Q22 ); /********************************/ /* High-Pass Filter */ /********************************/ SKP_Silk_biquad_alt( in, B_Q28, A_Q28, psEnc->sCmn.In_HP_State, out, psEnc->sCmn.frame_length ); }
SKP_INLINE void SKP_Silk_LDL_factorize_FIX( SKP_int32 *A, /* I Pointer to Symetric Square Matrix */ SKP_int M, /* I Size of Matrix */ SKP_int32 *L_Q16, /* I/O Pointer to Square Upper triangular Matrix */ inv_D_t *inv_D /* I/O Pointer to vector holding inverted diagonal elements of D */ ) { SKP_int i, j, k, status, loop_count; const SKP_int32 *ptr1, *ptr2; SKP_int32 diag_min_value, tmp_32, err; SKP_int32 v_Q0[ MAX_MATRIX_SIZE ], D_Q0[ MAX_MATRIX_SIZE ]; SKP_int32 one_div_diag_Q36, one_div_diag_Q40, one_div_diag_Q48; SKP_assert( M <= MAX_MATRIX_SIZE ); status = 1; diag_min_value = SKP_max_32( SKP_SMMUL( SKP_ADD_SAT32( A[ 0 ], A[ SKP_SMULBB( M, M ) - 1 ] ), SKP_FIX_CONST( FIND_LTP_COND_FAC, 31 ) ), 1 << 9 ); for( loop_count = 0; loop_count < M && status == 1; loop_count++ ) { status = 0; for( j = 0; j < M; j++ ) { ptr1 = matrix_adr( L_Q16, j, 0, M ); tmp_32 = 0; for( i = 0; i < j; i++ ) { v_Q0[ i ] = SKP_SMULWW( D_Q0[ i ], ptr1[ i ] ); /* Q0 */ tmp_32 = SKP_SMLAWW( tmp_32, v_Q0[ i ], ptr1[ i ] ); /* Q0 */ } tmp_32 = SKP_SUB32( matrix_ptr( A, j, j, M ), tmp_32 ); if( tmp_32 < diag_min_value ) { tmp_32 = SKP_SUB32( SKP_SMULBB( loop_count + 1, diag_min_value ), tmp_32 ); /* Matrix not positive semi-definite, or ill conditioned */ for( i = 0; i < M; i++ ) { matrix_ptr( A, i, i, M ) = SKP_ADD32( matrix_ptr( A, i, i, M ), tmp_32 ); } status = 1; break; } D_Q0[ j ] = tmp_32; /* always < max(Correlation) */ /* two-step division */ one_div_diag_Q36 = SKP_INVERSE32_varQ( tmp_32, 36 ); /* Q36 */ one_div_diag_Q40 = SKP_LSHIFT( one_div_diag_Q36, 4 ); /* Q40 */ err = SKP_SUB32( 1 << 24, SKP_SMULWW( tmp_32, one_div_diag_Q40 ) ); /* Q24 */ one_div_diag_Q48 = SKP_SMULWW( err, one_div_diag_Q40 ); /* Q48 */ /* Save 1/Ds */ inv_D[ j ].Q36_part = one_div_diag_Q36; inv_D[ j ].Q48_part = one_div_diag_Q48; matrix_ptr( L_Q16, j, j, M ) = 65536; /* 1.0 in Q16 */ ptr1 = matrix_adr( A, j, 0, M ); ptr2 = matrix_adr( L_Q16, j + 1, 0, M ); for( i = j + 1; i < M; i++ ) { tmp_32 = 0; for( k = 0; k < j; k++ ) { tmp_32 = SKP_SMLAWW( tmp_32, v_Q0[ k ], ptr2[ k ] ); /* Q0 */ } tmp_32 = SKP_SUB32( ptr1[ i ], tmp_32 ); /* always < max(Correlation) */ /* tmp_32 / D_Q0[j] : Divide to Q16 */ matrix_ptr( L_Q16, i, j, M ) = SKP_ADD32( SKP_SMMUL( tmp_32, one_div_diag_Q48 ), SKP_RSHIFT( SKP_SMULWW( tmp_32, one_div_diag_Q36 ), 4 ) ); /* go to next column */ ptr2 += M; } } } SKP_assert( status == 0 ); }
void SKP_Silk_PLC_conceal( SKP_Silk_decoder_state *psDec, /* I/O Decoder state */ SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */ SKP_int16 signal[], /* O concealed signal */ SKP_int length /* I length of residual */ ) { SKP_int i, j, k; SKP_int16 *B_Q14, exc_buf[ MAX_FRAME_LENGTH ], *exc_buf_ptr; SKP_int16 rand_scale_Q14, A_Q12_tmp[ MAX_LPC_ORDER ]; SKP_int32 rand_seed, harm_Gain_Q15, rand_Gain_Q15; SKP_int lag, idx, shift1, shift2; SKP_int32 energy1, energy2, *rand_ptr, *pred_lag_ptr, Atmp; SKP_int32 sig_Q10[ MAX_FRAME_LENGTH ], *sig_Q10_ptr, LPC_exc_Q10, LPC_pred_Q10, LTP_pred_Q14; SKP_Silk_PLC_struct *psPLC; psPLC = &psDec->sPLC; /* Update LTP buffer */ SKP_memcpy( psDec->sLTP_Q16, &psDec->sLTP_Q16[ psDec->frame_length ], psDec->frame_length * sizeof( SKP_int32 ) ); /* LPC concealment. Apply BWE to previous LPC */ SKP_Silk_bwexpander( psPLC->prevLPC_Q12, psDec->LPC_order, BWE_COEF_Q16 ); /* Find random noise component */ /* Scale previous excitation signal */ exc_buf_ptr = exc_buf; for( k = ( NB_SUBFR >> 1 ); k < NB_SUBFR; k++ ) { for( i = 0; i < psDec->subfr_length; i++ ) { exc_buf_ptr[ i ] = ( SKP_int16 )SKP_RSHIFT( SKP_SMULWW( psDec->exc_Q10[ i + k * psDec->subfr_length ], psPLC->prevGain_Q16[ k ] ), 10 ); } exc_buf_ptr += psDec->subfr_length; } /* Find the subframe with lowest energy of the last two and use that as random noise generator */ SKP_Silk_sum_sqr_shift( &energy1, &shift1, exc_buf, psDec->subfr_length ); SKP_Silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psDec->subfr_length ], psDec->subfr_length ); if( SKP_RSHIFT( energy1, shift2 ) < SKP_RSHIFT( energy1, shift2 ) ) { /* First sub-frame has lowest energy */ rand_ptr = &psDec->exc_Q10[ SKP_max_int( 0, 3 * psDec->subfr_length - RAND_BUF_SIZE ) ]; } else { /* Second sub-frame has lowest energy */ rand_ptr = &psDec->exc_Q10[ SKP_max_int( 0, psDec->frame_length - RAND_BUF_SIZE ) ]; } /* Setup Gain to random noise component */ B_Q14 = psPLC->LTPCoef_Q14; rand_scale_Q14 = psPLC->randScale_Q14; /* Setup attenuation gains */ harm_Gain_Q15 = HARM_ATT_Q15[ SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ]; if( psDec->prev_sigtype == SIG_TYPE_VOICED ) { rand_Gain_Q15 = PLC_RAND_ATTENUATE_V_Q15[ SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ]; } else { rand_Gain_Q15 = PLC_RAND_ATTENUATE_UV_Q15[ SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ]; } /* First Lost frame */ if( psDec->lossCnt == 0 ) { rand_scale_Q14 = (1 << 14 ); /* Reduce random noise Gain for voiced frames */ if( psDec->prev_sigtype == SIG_TYPE_VOICED ) { for( i = 0; i < LTP_ORDER; i++ ) { rand_scale_Q14 -= B_Q14[ i ]; } rand_scale_Q14 = SKP_max_16( 3277, rand_scale_Q14 ); /* 0.2 */ rand_scale_Q14 = ( SKP_int16 )SKP_RSHIFT( SKP_SMULBB( rand_scale_Q14, psPLC->prevLTP_scale_Q14 ), 14 ); } /* Reduce random noise for unvoiced frames with high LPC gain */ if( psDec->prev_sigtype == SIG_TYPE_UNVOICED ) { SKP_int32 invGain_Q30, down_scale_Q30; SKP_Silk_LPC_inverse_pred_gain( &invGain_Q30, psPLC->prevLPC_Q12, psDec->LPC_order ); down_scale_Q30 = SKP_min_32( SKP_RSHIFT( ( 1 << 30 ), LOG2_INV_LPC_GAIN_HIGH_THRES ), invGain_Q30 ); down_scale_Q30 = SKP_max_32( SKP_RSHIFT( ( 1 << 30 ), LOG2_INV_LPC_GAIN_LOW_THRES ), down_scale_Q30 ); down_scale_Q30 = SKP_LSHIFT( down_scale_Q30, LOG2_INV_LPC_GAIN_HIGH_THRES ); rand_Gain_Q15 = SKP_RSHIFT( SKP_SMULWB( down_scale_Q30, rand_Gain_Q15 ), 14 ); } } rand_seed = psPLC->rand_seed; lag = SKP_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 ); psDec->sLTP_buf_idx = psDec->frame_length; /***************************/ /* LTP synthesis filtering */ /***************************/ sig_Q10_ptr = sig_Q10; for( k = 0; k < NB_SUBFR; k++ ) { /* Setup pointer */ pred_lag_ptr = &psDec->sLTP_Q16[ psDec->sLTP_buf_idx - lag + LTP_ORDER / 2 ]; for( i = 0; i < psDec->subfr_length; i++ ) { rand_seed = SKP_RAND( rand_seed ); idx = SKP_RSHIFT( rand_seed, 25 ) & RAND_BUF_MASK; /* Unrolled loop */ LTP_pred_Q14 = SKP_SMULWB( pred_lag_ptr[ 0 ], B_Q14[ 0 ] ); LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -1 ], B_Q14[ 1 ] ); LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -2 ], B_Q14[ 2 ] ); LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -3 ], B_Q14[ 3 ] ); LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -4 ], B_Q14[ 4 ] ); pred_lag_ptr++; /* Generate LPC residual */ LPC_exc_Q10 = SKP_LSHIFT( SKP_SMULWB( rand_ptr[ idx ], rand_scale_Q14 ), 2 ); /* Random noise part */ LPC_exc_Q10 = SKP_ADD32( LPC_exc_Q10, SKP_RSHIFT_ROUND( LTP_pred_Q14, 4 ) ); /* Harmonic part */ /* Update states */ psDec->sLTP_Q16[ psDec->sLTP_buf_idx ] = SKP_LSHIFT( LPC_exc_Q10, 6 ); psDec->sLTP_buf_idx++; /* Save LPC residual */ sig_Q10_ptr[ i ] = LPC_exc_Q10; } sig_Q10_ptr += psDec->subfr_length; /* Gradually reduce LTP gain */ for( j = 0; j < LTP_ORDER; j++ ) { B_Q14[ j ] = SKP_RSHIFT( SKP_SMULBB( harm_Gain_Q15, B_Q14[ j ] ), 15 ); } /* Gradually reduce excitation gain */ rand_scale_Q14 = SKP_RSHIFT( SKP_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 ); /* Slowly increase pitch lag */ psPLC->pitchL_Q8 += SKP_SMULWB( psPLC->pitchL_Q8, PITCH_DRIFT_FAC_Q16 ); psPLC->pitchL_Q8 = SKP_min_32( psPLC->pitchL_Q8, SKP_LSHIFT( SKP_SMULBB( MAX_PITCH_LAG_MS, psDec->fs_kHz ), 8 ) ); lag = SKP_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 ); } /***************************/ /* LPC synthesis filtering */ /***************************/ sig_Q10_ptr = sig_Q10; /* Preload LPC coeficients to array on stack. Gives small performance gain */ SKP_memcpy( A_Q12_tmp, psPLC->prevLPC_Q12, psDec->LPC_order * sizeof( SKP_int16 ) ); SKP_assert( psDec->LPC_order >= 10 ); /* check that unrolling works */ for( k = 0; k < NB_SUBFR; k++ ) { for( i = 0; i < psDec->subfr_length; i++ ){ /* unrolled */ Atmp = *( ( SKP_int32* )&A_Q12_tmp[ 0 ] ); /* read two coefficients at once */ LPC_pred_Q10 = SKP_SMULWB( psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 1 ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 2 ], Atmp ); Atmp = *( ( SKP_int32* )&A_Q12_tmp[ 2 ] ); LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 3 ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 4 ], Atmp ); Atmp = *( ( SKP_int32* )&A_Q12_tmp[ 4 ] ); LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 5 ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 6 ], Atmp ); Atmp = *( ( SKP_int32* )&A_Q12_tmp[ 6 ] ); LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 7 ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 8 ], Atmp ); Atmp = *( ( SKP_int32* )&A_Q12_tmp[ 8 ] ); LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 9 ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], Atmp ); for( j = 10 ; j < psDec->LPC_order ; j+=2 ) { Atmp = *( ( SKP_int32* )&A_Q12_tmp[ j ] ); LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 1 - j ], Atmp ); LPC_pred_Q10 = SKP_SMLAWT( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 2 - j ], Atmp ); } /* Add prediction to LPC residual */ sig_Q10_ptr[ i ] = SKP_ADD32( sig_Q10_ptr[ i ], LPC_pred_Q10 ); /* Update states */ psDec->sLPC_Q14[ MAX_LPC_ORDER + i ] = SKP_LSHIFT( sig_Q10_ptr[ i ], 4 ); } sig_Q10_ptr += psDec->subfr_length; /* Update LPC filter state */ SKP_memcpy( psDec->sLPC_Q14, &psDec->sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( SKP_int32 ) ); } /* Scale with Gain */ for( i = 0; i < psDec->frame_length; i++ ) { signal[ i ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND( SKP_SMULWW( sig_Q10[ i ], psPLC->prevGain_Q16[ NB_SUBFR - 1 ] ), 10 ) ); } /**************************************/ /* Update states */ /**************************************/ psPLC->rand_seed = rand_seed; psPLC->randScale_Q14 = rand_scale_Q14; for( i = 0; i < NB_SUBFR; i++ ) { psDecCtrl->pitchL[ i ] = lag; } }
void SKP_Silk_noise_shape_analysis_FIX( SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */ SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control FIX */ const SKP_int16 *pitch_res, /* I LPC residual from pitch analysis */ const SKP_int16 *x /* I Input signal [ frame_length + la_shape ] */ ) { SKP_Silk_shape_state_FIX *psShapeSt = &psEnc->sShape; SKP_int k, i, nSamples, Qnrg, b_Q14, warping_Q16, scale = 0; SKP_int32 SNR_adj_dB_Q7, HarmBoost_Q16, HarmShapeGain_Q16, Tilt_Q16, tmp32; SKP_int32 nrg, pre_nrg_Q30, log_energy_Q7, log_energy_prev_Q7, energy_variation_Q7; SKP_int32 delta_Q16, BWExp1_Q16, BWExp2_Q16, gain_mult_Q16, gain_add_Q16, strength_Q16, b_Q8; SKP_int32 auto_corr[ MAX_SHAPE_LPC_ORDER + 1 ]; SKP_int32 refl_coef_Q16[ MAX_SHAPE_LPC_ORDER ]; SKP_int32 AR1_Q24[ MAX_SHAPE_LPC_ORDER ]; SKP_int32 AR2_Q24[ MAX_SHAPE_LPC_ORDER ]; SKP_int16 x_windowed[ SHAPE_LPC_WIN_MAX ]; const SKP_int16 *x_ptr, *pitch_res_ptr; SKP_int32 sqrt_nrg[ NB_SUBFR ], Qnrg_vec[ NB_SUBFR ]; /* Point to start of first LPC analysis block */ x_ptr = x - psEnc->sCmn.la_shape; /****************/ /* CONTROL SNR */ /****************/ /* Reduce SNR_dB values if recent bitstream has exceeded TargetRate */ psEncCtrl->current_SNR_dB_Q7 = psEnc->SNR_dB_Q7 - SKP_SMULWB( SKP_LSHIFT( ( SKP_int32 )psEnc->BufferedInChannel_ms, 7 ), SKP_FIX_CONST( 0.05, 16 ) ); /* Reduce SNR_dB if inband FEC used */ if( psEnc->speech_activity_Q8 > SKP_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) { psEncCtrl->current_SNR_dB_Q7 -= SKP_RSHIFT( psEnc->inBandFEC_SNR_comp_Q8, 1 ); } /****************/ /* GAIN CONTROL */ /****************/ /* Input quality is the average of the quality in the lowest two VAD bands */ psEncCtrl->input_quality_Q14 = ( SKP_int )SKP_RSHIFT( ( SKP_int32 )psEncCtrl->input_quality_bands_Q15[ 0 ] + psEncCtrl->input_quality_bands_Q15[ 1 ], 2 ); /* Coding quality level, between 0.0_Q0 and 1.0_Q0, but in Q14 */ psEncCtrl->coding_quality_Q14 = SKP_RSHIFT( SKP_Silk_sigm_Q15( SKP_RSHIFT_ROUND( psEncCtrl->current_SNR_dB_Q7 - SKP_FIX_CONST( 18.0, 7 ), 4 ) ), 1 ); /* Reduce coding SNR during low speech activity */ b_Q8 = SKP_FIX_CONST( 1.0, 8 ) - psEnc->speech_activity_Q8; b_Q8 = SKP_SMULWB( SKP_LSHIFT( b_Q8, 8 ), b_Q8 ); SNR_adj_dB_Q7 = SKP_SMLAWB( psEncCtrl->current_SNR_dB_Q7, SKP_SMULBB( SKP_FIX_CONST( -BG_SNR_DECR_dB, 7 ) >> ( 4 + 1 ), b_Q8 ), // Q11 SKP_SMULWB( SKP_FIX_CONST( 1.0, 14 ) + psEncCtrl->input_quality_Q14, psEncCtrl->coding_quality_Q14 ) ); // Q12 if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { /* Reduce gains for periodic signals */ SNR_adj_dB_Q7 = SKP_SMLAWB( SNR_adj_dB_Q7, SKP_FIX_CONST( HARM_SNR_INCR_dB, 8 ), psEnc->LTPCorr_Q15 ); } else { /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */ SNR_adj_dB_Q7 = SKP_SMLAWB( SNR_adj_dB_Q7, SKP_SMLAWB( SKP_FIX_CONST( 6.0, 9 ), -SKP_FIX_CONST( 0.4, 18 ), psEncCtrl->current_SNR_dB_Q7 ), SKP_FIX_CONST( 1.0, 14 ) - psEncCtrl->input_quality_Q14 ); } /*************************/ /* SPARSENESS PROCESSING */ /*************************/ /* Set quantizer offset */ if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { /* Initally set to 0; may be overruled in process_gains(..) */ psEncCtrl->sCmn.QuantOffsetType = 0; psEncCtrl->sparseness_Q8 = 0; } else { /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */ nSamples = SKP_LSHIFT( psEnc->sCmn.fs_kHz, 1 ); energy_variation_Q7 = 0; log_energy_prev_Q7 = 0; pitch_res_ptr = pitch_res; for( k = 0; k < FRAME_LENGTH_MS / 2; k++ ) { SKP_Silk_sum_sqr_shift( &nrg, &scale, pitch_res_ptr, nSamples ); nrg += SKP_RSHIFT( nSamples, scale ); // Q(-scale) log_energy_Q7 = SKP_Silk_lin2log( nrg ); if( k > 0 ) { energy_variation_Q7 += SKP_abs( log_energy_Q7 - log_energy_prev_Q7 ); } log_energy_prev_Q7 = log_energy_Q7; pitch_res_ptr += nSamples; } psEncCtrl->sparseness_Q8 = SKP_RSHIFT( SKP_Silk_sigm_Q15( SKP_SMULWB( energy_variation_Q7 - SKP_FIX_CONST( 5.0, 7 ), SKP_FIX_CONST( 0.1, 16 ) ) ), 7 ); /* Set quantization offset depending on sparseness measure */ if( psEncCtrl->sparseness_Q8 > SKP_FIX_CONST( SPARSENESS_THRESHOLD_QNT_OFFSET, 8 ) ) { psEncCtrl->sCmn.QuantOffsetType = 0; } else { psEncCtrl->sCmn.QuantOffsetType = 1; } /* Increase coding SNR for sparse signals */ SNR_adj_dB_Q7 = SKP_SMLAWB( SNR_adj_dB_Q7, SKP_FIX_CONST( SPARSE_SNR_INCR_dB, 15 ), psEncCtrl->sparseness_Q8 - SKP_FIX_CONST( 0.5, 8 ) ); } /*******************************/ /* Control bandwidth expansion */ /*******************************/ /* More BWE for signals with high prediction gain */ strength_Q16 = SKP_SMULWB( psEncCtrl->predGain_Q16, SKP_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ); BWExp1_Q16 = BWExp2_Q16 = SKP_DIV32_varQ( SKP_FIX_CONST( BANDWIDTH_EXPANSION, 16 ), SKP_SMLAWW( SKP_FIX_CONST( 1.0, 16 ), strength_Q16, strength_Q16 ), 16 ); delta_Q16 = SKP_SMULWB( SKP_FIX_CONST( 1.0, 16 ) - SKP_SMULBB( 3, psEncCtrl->coding_quality_Q14 ), SKP_FIX_CONST( LOW_RATE_BANDWIDTH_EXPANSION_DELTA, 16 ) ); BWExp1_Q16 = SKP_SUB32( BWExp1_Q16, delta_Q16 ); BWExp2_Q16 = SKP_ADD32( BWExp2_Q16, delta_Q16 ); /* BWExp1 will be applied after BWExp2, so make it relative */ BWExp1_Q16 = SKP_DIV32_16( SKP_LSHIFT( BWExp1_Q16, 14 ), SKP_RSHIFT( BWExp2_Q16, 2 ) ); if( psEnc->sCmn.warping_Q16 > 0 ) { /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */ warping_Q16 = SKP_SMLAWB( psEnc->sCmn.warping_Q16, psEncCtrl->coding_quality_Q14, SKP_FIX_CONST( 0.01, 18 ) ); } else { warping_Q16 = 0; } /********************************************/ /* Compute noise shaping AR coefs and gains */ /********************************************/ for( k = 0; k < NB_SUBFR; k++ ) { /* Apply window: sine slope followed by flat part followed by cosine slope */ SKP_int shift, slope_part, flat_part; flat_part = psEnc->sCmn.fs_kHz * 5; slope_part = SKP_RSHIFT( psEnc->sCmn.shapeWinLength - flat_part, 1 ); SKP_Silk_apply_sine_window_new( x_windowed, x_ptr, 1, slope_part ); shift = slope_part; SKP_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(SKP_int16) ); shift += flat_part; SKP_Silk_apply_sine_window_new( x_windowed + shift, x_ptr + shift, 2, slope_part ); /* Update pointer: next LPC analysis block */ x_ptr += psEnc->sCmn.subfr_length; if( psEnc->sCmn.warping_Q16 > 0 ) { /* Calculate warped auto correlation */ SKP_Silk_warped_autocorrelation_FIX( auto_corr, &scale, x_windowed, warping_Q16, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder ); } else { /* Calculate regular auto correlation */ SKP_Silk_autocorr( auto_corr, &scale, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1 ); } /* Add white noise, as a fraction of energy */ auto_corr[0] = SKP_ADD32( auto_corr[0], SKP_max_32( SKP_SMULWB( SKP_RSHIFT( auto_corr[ 0 ], 4 ), SKP_FIX_CONST( SHAPE_WHITE_NOISE_FRACTION, 20 ) ), 1 ) ); /* Calculate the reflection coefficients using schur */ nrg = SKP_Silk_schur64( refl_coef_Q16, auto_corr, psEnc->sCmn.shapingLPCOrder ); SKP_assert( nrg >= 0 ); /* Convert reflection coefficients to prediction coefficients */ SKP_Silk_k2a_Q16( AR2_Q24, refl_coef_Q16, psEnc->sCmn.shapingLPCOrder ); Qnrg = -scale; // range: -12...30 SKP_assert( Qnrg >= -12 ); SKP_assert( Qnrg <= 30 ); /* Make sure that Qnrg is an even number */ if( Qnrg & 1 ) { Qnrg -= 1; nrg >>= 1; } tmp32 = SKP_Silk_SQRT_APPROX( nrg ); Qnrg >>= 1; // range: -6...15 sqrt_nrg[ k ] = tmp32; Qnrg_vec[ k ] = Qnrg; psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( tmp32, 16 - Qnrg ); if( psEnc->sCmn.warping_Q16 > 0 ) { /* Adjust gain for warping */ gain_mult_Q16 = warped_gain( AR2_Q24, warping_Q16, psEnc->sCmn.shapingLPCOrder ); SKP_assert( psEncCtrl->Gains_Q16[ k ] >= 0 ); psEncCtrl->Gains_Q16[ k ] = SKP_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 ); if( psEncCtrl->Gains_Q16[ k ] < 0 ) { psEncCtrl->Gains_Q16[ k ] = SKP_int32_MAX; } } /* Bandwidth expansion for synthesis filter shaping */ SKP_Silk_bwexpander_32( AR2_Q24, psEnc->sCmn.shapingLPCOrder, BWExp2_Q16 ); /* Compute noise shaping filter coefficients */ SKP_memcpy( AR1_Q24, AR2_Q24, psEnc->sCmn.shapingLPCOrder * sizeof( SKP_int32 ) ); /* Bandwidth expansion for analysis filter shaping */ SKP_assert( BWExp1_Q16 <= SKP_FIX_CONST( 1.0, 16 ) ); SKP_Silk_bwexpander_32( AR1_Q24, psEnc->sCmn.shapingLPCOrder, BWExp1_Q16 ); /* Ratio of prediction gains, in energy domain */ SKP_Silk_LPC_inverse_pred_gain_Q24( &pre_nrg_Q30, AR2_Q24, psEnc->sCmn.shapingLPCOrder ); SKP_Silk_LPC_inverse_pred_gain_Q24( &nrg, AR1_Q24, psEnc->sCmn.shapingLPCOrder ); //psEncCtrl->GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg ) = 0.3f + 0.7f * pre_nrg / nrg; pre_nrg_Q30 = SKP_LSHIFT32( SKP_SMULWB( pre_nrg_Q30, SKP_FIX_CONST( 0.7, 15 ) ), 1 ); psEncCtrl->GainsPre_Q14[ k ] = ( SKP_int ) SKP_FIX_CONST( 0.3, 14 ) + SKP_DIV32_varQ( pre_nrg_Q30, nrg, 14 ); /* Convert to monic warped prediction coefficients and limit absolute values */ limit_warped_coefs( AR2_Q24, AR1_Q24, warping_Q16, SKP_FIX_CONST( 3.999, 24 ), psEnc->sCmn.shapingLPCOrder ); /* Convert from Q24 to Q13 and store in int16 */ for( i = 0; i < psEnc->sCmn.shapingLPCOrder; i++ ) { psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT_ROUND( AR1_Q24[ i ], 11 ) ); psEncCtrl->AR2_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT_ROUND( AR2_Q24[ i ], 11 ) ); } }
/* Convert from Q24 to Q13 and store in int16 */ for( i = 0; i < psEnc->sCmn.shapingLPCOrder; i++ ) { psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT_ROUND( AR1_Q24[ i ], 11 ) ); psEncCtrl->AR2_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (SKP_int16)SKP_SAT16( SKP_RSHIFT_ROUND( AR2_Q24[ i ], 11 ) ); } } /*****************/ /* Gain tweaking */ /*****************/ /* Increase gains during low speech activity and put lower limit on gains */ gain_mult_Q16 = SKP_Silk_log2lin( -SKP_SMLAWB( -SKP_FIX_CONST( 16.0, 7 ), SNR_adj_dB_Q7, SKP_FIX_CONST( 0.16, 16 ) ) ); gain_add_Q16 = SKP_Silk_log2lin( SKP_SMLAWB( SKP_FIX_CONST( 16.0, 7 ), SKP_FIX_CONST( NOISE_FLOOR_dB, 7 ), SKP_FIX_CONST( 0.16, 16 ) ) ); tmp32 = SKP_Silk_log2lin( SKP_SMLAWB( SKP_FIX_CONST( 16.0, 7 ), SKP_FIX_CONST( RELATIVE_MIN_GAIN_dB, 7 ), SKP_FIX_CONST( 0.16, 16 ) ) ); tmp32 = SKP_SMULWW( psEnc->avgGain_Q16, tmp32 ); gain_add_Q16 = SKP_ADD_SAT32( gain_add_Q16, tmp32 ); SKP_assert( gain_mult_Q16 >= 0 ); for( k = 0; k < NB_SUBFR; k++ ) { psEncCtrl->Gains_Q16[ k ] = SKP_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 ); if( psEncCtrl->Gains_Q16[ k ] < 0 ) { psEncCtrl->Gains_Q16[ k ] = SKP_int32_MAX; } } for( k = 0; k < NB_SUBFR; k++ ) { psEncCtrl->Gains_Q16[ k ] = SKP_ADD_POS_SAT32( psEncCtrl->Gains_Q16[ k ], gain_add_Q16 ); psEnc->avgGain_Q16 = SKP_ADD_SAT32( psEnc->avgGain_Q16, SKP_SMULWB(
/* Processing of gains */ void SKP_Silk_process_gains_FIX( SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state_FIX */ SKP_Silk_encoder_control_FIX *psEncCtrl /* I/O Encoder control_FIX */ ) { SKP_Silk_shape_state_FIX *psShapeSt = &psEnc->sShape; SKP_int k; SKP_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart; /* Gain reduction when LTP coding gain is high */ if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { /*s = -0.5f * SKP_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */ s_Q16 = -SKP_Silk_sigm_Q15( SKP_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - (12 << 7), 4 ) ); for( k = 0; k < NB_SUBFR; k++ ) { psEncCtrl->Gains_Q16[ k ] = SKP_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 ); } } /* Limit the quantized signal */ /* 69 = 21.0f + 16/0.33 */ InvMaxSqrVal_Q16 = SKP_DIV32_16( SKP_Silk_log2lin( SKP_SMULWB( (69 << 7) - psEncCtrl->current_SNR_dB_Q7, SKP_FIX_CONST( 0.33, 16 )) ), psEnc->sCmn.subfr_length ); for( k = 0; k < NB_SUBFR; k++ ) { /* Soft limit on ratio residual energy and squared gains */ ResNrg = psEncCtrl->ResNrg[ k ]; ResNrgPart = SKP_SMULWW( ResNrg, InvMaxSqrVal_Q16 ); if( psEncCtrl->ResNrgQ[ k ] > 0 ) { if( psEncCtrl->ResNrgQ[ k ] < 32 ) { ResNrgPart = SKP_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] ); } else { ResNrgPart = 0; } } else if( psEncCtrl->ResNrgQ[k] != 0 ) { if( ResNrgPart > SKP_RSHIFT( SKP_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) { ResNrgPart = SKP_int32_MAX; } else { ResNrgPart = SKP_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] ); } } gain = psEncCtrl->Gains_Q16[ k ]; gain_squared = SKP_ADD_SAT32( ResNrgPart, SKP_SMMUL( gain, gain ) ); if( gain_squared < SKP_int16_MAX ) { /* recalculate with higher precision */ gain_squared = SKP_SMLAWW( SKP_LSHIFT( ResNrgPart, 16 ), gain, gain ); SKP_assert( gain_squared > 0 ); gain = SKP_Silk_SQRT_APPROX( gain_squared ); /* Q8 */ psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( gain, 8 ); /* Q16 */ } else { gain = SKP_Silk_SQRT_APPROX( gain_squared ); /* Q0 */ psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( gain, 16 ); /* Q16 */ } } /* Noise shaping quantization */ SKP_Silk_gains_quant( psEncCtrl->sCmn.GainsIndices, psEncCtrl->Gains_Q16, &psShapeSt->LastGainIndex, psEnc->sCmn.nFramesInPayloadBuf ); /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { if( psEncCtrl->LTPredCodGain_Q7 + SKP_RSHIFT( psEncCtrl->input_tilt_Q15, 8 ) > ( 1 << 7 ) ) { psEncCtrl->sCmn.QuantOffsetType = 0; } else { psEncCtrl->sCmn.QuantOffsetType = 1; } } /* Quantizer boundary adjustment */ if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) { psEncCtrl->Lambda_Q10 = SKP_FIX_CONST( 1.3, 10 ) - SKP_SMULWB( SKP_FIX_CONST( 0.5, 18 ), psEnc->speech_activity_Q8 ) - SKP_SMULWB( SKP_FIX_CONST( 0.3, 12 ), psEncCtrl->input_quality_Q14 ) + SKP_SMULBB( SKP_FIX_CONST( 0.2, 10 ), psEncCtrl->sCmn.QuantOffsetType ) - SKP_SMULWB( SKP_FIX_CONST( 0.1, 12 ), psEncCtrl->coding_quality_Q14 ); } else { psEncCtrl->Lambda_Q10 = SKP_FIX_CONST( 1.3, 10 ) - SKP_SMULWB( SKP_FIX_CONST( 0.5, 18 ), psEnc->speech_activity_Q8 ) - SKP_SMULWB( SKP_FIX_CONST( 0.4, 12 ), psEncCtrl->input_quality_Q14 ) + SKP_SMULBB( SKP_FIX_CONST( 0.4, 10 ), psEncCtrl->sCmn.QuantOffsetType ) - SKP_SMULWB( SKP_FIX_CONST( 0.1, 12 ), psEncCtrl->coding_quality_Q14 ); } SKP_assert( psEncCtrl->Lambda_Q10 >= 0 ); SKP_assert( psEncCtrl->Lambda_Q10 < SKP_FIX_CONST( 2, 10 ) ); }