115 lines
4.5 KiB
C#
115 lines
4.5 KiB
C#
using System;
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using System.IO;
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// This file is part of the ANX.Framework and originally taken from
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// the AC.AL OpenAL library, released under the MIT License.
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// For details see: http://acal.codeplex.com/license
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namespace WaveUtils
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{
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/// <summary>
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/// http://www.threejacks.com/?q=node/176
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/// </summary>
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internal static class MuLaw
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{
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#region Decode Table
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private static readonly short[] DecodeTable =
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{
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-32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
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-23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
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-15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
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-11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
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-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
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-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
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-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
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-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
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-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
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-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
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-876, -844, -812, -780, -748, -716, -684, -652,
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-620, -588, -556, -524, -492, -460, -428, -396,
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-372, -356, -340, -324, -308, -292, -276, -260,
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-244, -228, -212, -196, -180, -164, -148, -132,
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-120, -112, -104, -96, -88, -80, -72, -64,
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-56, -48, -40, -32, -24, -16, -8, -1,
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32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
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23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
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15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
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11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
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7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
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5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
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3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
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2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
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1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
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1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
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876, 844, 812, 780, 748, 716, 684, 652,
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620, 588, 556, 524, 492, 460, 428, 396,
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372, 356, 340, 324, 308, 292, 276, 260,
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244, 228, 212, 196, 180, 164, 148, 132,
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120, 112, 104, 96, 88, 80, 72, 64,
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56, 48, 40, 32, 24, 16, 8, 0
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};
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#endregion
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#region Encode Table
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private static readonly byte[] EncodeTable =
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{
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0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
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};
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#endregion
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#region ConvertToMuLaw (TODO)
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private static void ConvertToMuLaw(WaveInfo info)
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{
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//int sign = (sample >> 8) & 0x80;
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//if (sign)
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// sample = (short)-sample;
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//if (sample > cClip)
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// sample = cClip;
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//sample = (short)(sample + cBias);
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//int exponent = (int)MuLawCompressTable[(sample>>7) & 0xFF];
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//int mantissa = (sample >> (exponent+3)) & 0x0F;
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//int compressedByte = ~ (sign | (exponent << 4) | mantissa);
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//return (unsigned char)compressedByte;
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}
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#endregion
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#region ConvertToPcm
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public static void ConvertToPcm(WaveInfo info, int resultChannelCount)
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{
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using (MemoryStream destStream = new MemoryStream())
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{
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BinaryWriter destWriter = new BinaryWriter(destStream);
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int increment = 1;
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if (info.Channels == 2 && resultChannelCount == 1)
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increment = 2;
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info.Channels = resultChannelCount;
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info.ALFormat = info.Channels == 1 ? ALFormat.Mono16 : ALFormat.Stereo16;
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for (int index = 0; index < info.Data.Length; index += increment)
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destWriter.Write(DecodeTable[info.Data[index]]);
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info.Data = destStream.ToArray();
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}
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}
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#endregion
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}
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}
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