cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main_FIX.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: /* Processing of gains */ cannam@154: void silk_process_gains_FIX( cannam@154: silk_encoder_state_FIX *psEnc, /* I/O Encoder state */ cannam@154: silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control */ cannam@154: opus_int condCoding /* I The type of conditional coding to use */ cannam@154: ) cannam@154: { cannam@154: silk_shape_state_FIX *psShapeSt = &psEnc->sShape; cannam@154: opus_int k; cannam@154: opus_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10; cannam@154: cannam@154: /* Gain reduction when LTP coding gain is high */ cannam@154: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { cannam@154: /*s = -0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */ cannam@154: s_Q16 = -silk_sigm_Q15( silk_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) ); cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: psEncCtrl->Gains_Q16[ k ] = silk_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 ); cannam@154: } cannam@154: } cannam@154: cannam@154: /* Limit the quantized signal */ cannam@154: /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */ cannam@154: InvMaxSqrVal_Q16 = silk_DIV32_16( silk_log2lin( cannam@154: silk_SMULWB( SILK_FIX_CONST( 21 + 16 / 0.33, 7 ) - psEnc->sCmn.SNR_dB_Q7, SILK_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length ); cannam@154: cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: /* Soft limit on ratio residual energy and squared gains */ cannam@154: ResNrg = psEncCtrl->ResNrg[ k ]; cannam@154: ResNrgPart = silk_SMULWW( ResNrg, InvMaxSqrVal_Q16 ); cannam@154: if( psEncCtrl->ResNrgQ[ k ] > 0 ) { cannam@154: ResNrgPart = silk_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] ); cannam@154: } else { cannam@154: if( ResNrgPart >= silk_RSHIFT( silk_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) { cannam@154: ResNrgPart = silk_int32_MAX; cannam@154: } else { cannam@154: ResNrgPart = silk_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] ); cannam@154: } cannam@154: } cannam@154: gain = psEncCtrl->Gains_Q16[ k ]; cannam@154: gain_squared = silk_ADD_SAT32( ResNrgPart, silk_SMMUL( gain, gain ) ); cannam@154: if( gain_squared < silk_int16_MAX ) { cannam@154: /* recalculate with higher precision */ cannam@154: gain_squared = silk_SMLAWW( silk_LSHIFT( ResNrgPart, 16 ), gain, gain ); cannam@154: silk_assert( gain_squared > 0 ); cannam@154: gain = silk_SQRT_APPROX( gain_squared ); /* Q8 */ cannam@154: gain = silk_min( gain, silk_int32_MAX >> 8 ); cannam@154: psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 8 ); /* Q16 */ cannam@154: } else { cannam@154: gain = silk_SQRT_APPROX( gain_squared ); /* Q0 */ cannam@154: gain = silk_min( gain, silk_int32_MAX >> 16 ); cannam@154: psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 16 ); /* Q16 */ cannam@154: } cannam@154: } cannam@154: cannam@154: /* Save unquantized gains and gain Index */ cannam@154: silk_memcpy( psEncCtrl->GainsUnq_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); cannam@154: psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; cannam@154: cannam@154: /* Quantize gains */ cannam@154: silk_gains_quant( psEnc->sCmn.indices.GainsIndices, psEncCtrl->Gains_Q16, cannam@154: &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ cannam@154: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { cannam@154: if( psEncCtrl->LTPredCodGain_Q7 + silk_RSHIFT( psEnc->sCmn.input_tilt_Q15, 8 ) > SILK_FIX_CONST( 1.0, 7 ) ) { cannam@154: psEnc->sCmn.indices.quantOffsetType = 0; cannam@154: } else { cannam@154: psEnc->sCmn.indices.quantOffsetType = 1; cannam@154: } cannam@154: } cannam@154: cannam@154: /* Quantizer boundary adjustment */ cannam@154: quant_offset_Q10 = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ]; cannam@154: psEncCtrl->Lambda_Q10 = SILK_FIX_CONST( LAMBDA_OFFSET, 10 ) cannam@154: + silk_SMULBB( SILK_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision ) cannam@154: + silk_SMULWB( SILK_FIX_CONST( LAMBDA_SPEECH_ACT, 18 ), psEnc->sCmn.speech_activity_Q8 ) cannam@154: + silk_SMULWB( SILK_FIX_CONST( LAMBDA_INPUT_QUALITY, 12 ), psEncCtrl->input_quality_Q14 ) cannam@154: + silk_SMULWB( SILK_FIX_CONST( LAMBDA_CODING_QUALITY, 12 ), psEncCtrl->coding_quality_Q14 ) cannam@154: + silk_SMULWB( SILK_FIX_CONST( LAMBDA_QUANT_OFFSET, 16 ), quant_offset_Q10 ); cannam@154: cannam@154: silk_assert( psEncCtrl->Lambda_Q10 > 0 ); cannam@154: silk_assert( psEncCtrl->Lambda_Q10 < SILK_FIX_CONST( 2, 10 ) ); cannam@154: }