mirror of
https://github.com/Gericom/EveryFileExplorer.git
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381ef84ce5
Also, added an error when trying to open a dll from external sources (instead of an exception). Auto creates Plugins directory, and copies the libraries.
83 lines
2.8 KiB
C#
83 lines
2.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace NDS.SND
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{
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//Tempoarly from mkdscm
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//I need to rewrite this all
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public class ADPCM
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{
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private static int[] indexTable =
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{ -1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8 };
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private static int[] stepsizeTable =
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{ 7, 8, 9, 10, 11, 12, 13, 14,
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16, 17, 19, 21, 23, 25, 28,
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31, 34, 37, 41, 45, 50, 55,
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60, 66, 73, 80, 88, 97, 107,
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118, 130, 143, 157, 173, 190, 209,
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230, 253, 279, 307, 337, 371, 408,
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449, 494, 544, 598, 658, 724, 796,
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876, 963, 1060, 1166, 1282, 1411, 1552,
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1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026,
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4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630,
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9493, 10442, 11487, 12635, 13899, 15289, 16818,
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18500, 20350, 22385, 24623, 27086, 29794, 32767 };
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public unsafe static void ConvertImaAdpcm(byte* buf, int length, byte* outbuffer)
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{
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int a = ((short*)buf)[0];
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int b = ((short*)buf)[1] & 0x7F;
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((short*)outbuffer)[0] = (short)a;
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ConvertImaAdpcm(buf + 4, length - 4, outbuffer + 2, ref a, ref b);
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}
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public unsafe static void ConvertImaAdpcm(byte* buf, int length, byte* outbuffer, ref int decompSample, ref int stepIndex)
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{
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uint destOff = 0;
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uint curOffset = 0;
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byte compByte;
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while (curOffset < length)
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{
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compByte = buf[curOffset++];
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process_nibble(compByte, ref stepIndex, ref decompSample);
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((short*)outbuffer)[destOff++] = (short)decompSample;
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process_nibble((byte)((compByte & 0xF0) >> 4), ref stepIndex, ref decompSample);
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((short*)outbuffer)[destOff++] = (short)decompSample;
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}
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}
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private static int IMAMax(int samp) { return (samp > 0x7FFF) ? ((short)0x7FFF) : samp; }
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private static int IMAMin(int samp) { return (samp < -0x7FFF) ? ((short)-0x7FFF) : samp; }
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private static int IMAIndexMinMax(int index, int min, int max) { return (index > max) ? max : ((index < min) ? min : index); }
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private static void process_nibble(byte data4bit, ref int Index, ref int Pcm16bit)
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{
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int Diff = stepsizeTable[Index] / 8;
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if ((data4bit & 1) != 0) Diff = Diff + stepsizeTable[Index] / 4;
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if ((data4bit & 2) != 0) Diff = Diff + stepsizeTable[Index] / 2;
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if ((data4bit & 4) != 0) Diff = Diff + stepsizeTable[Index] / 1;
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if ((data4bit & 8) == 0) Pcm16bit = IMAMax(Pcm16bit + Diff);
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if ((data4bit & 8) == 8) Pcm16bit = IMAMin(Pcm16bit - Diff);
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Index = IMAIndexMinMax(Index + indexTable[data4bit & 7], 0, 88);
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}
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private static void clamp_step_index(ref int stepIndex)
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{
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if (stepIndex < 0) stepIndex = 0;
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if (stepIndex > 88) stepIndex = 88;
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}
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private static void clamp_sample(ref int decompSample)
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{
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if (decompSample < -32768) decompSample = -32768;
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if (decompSample > 32767) decompSample = 32767;
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}
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}
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}
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