67 lines
3.1 KiB
C#
67 lines
3.1 KiB
C#
/* Copyright (c) 2006-2011 Skype Limited. All Rights Reserved
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Ported to C# by Logan Stromberg
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Concentus.Silk
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{
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using Concentus.Common;
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using Concentus.Common.CPlusPlus;
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using Concentus.Silk.Enums;
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using Concentus.Silk.Structs;
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using System.Diagnostics;
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internal static class LTPScaleControl
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{
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/* Calculation of LTP state scaling */
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internal static void silk_LTP_scale_ctrl(
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SilkChannelEncoder psEnc, /* I/O encoder state */
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SilkEncoderControl psEncCtrl, /* I/O encoder control */
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int condCoding /* I The type of conditional coding to use */
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)
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{
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int round_loss;
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if (condCoding == SilkConstants.CODE_INDEPENDENTLY)
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{
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/* Only scale if first frame in packet */
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round_loss = psEnc.PacketLoss_perc + psEnc.nFramesPerPacket;
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psEnc.indices.LTP_scaleIndex = (sbyte)Inlines.silk_LIMIT(
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Inlines.silk_SMULWB(Inlines.silk_SMULBB(round_loss, psEncCtrl.LTPredCodGain_Q7), ((int)((0.1f) * ((long)1 << (9)) + 0.5))/*Inlines.SILK_CONST(0.1f, 9)*/), 0, 2);
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}
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else {
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/* Default is minimum scaling */
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psEnc.indices.LTP_scaleIndex = 0;
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}
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psEncCtrl.LTP_scale_Q14 = Tables.silk_LTPScales_table_Q14[psEnc.indices.LTP_scaleIndex];
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}
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}
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}
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