| 1 | using System;
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| 2 | using System.Collections.Generic;
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| 3 | using System.Text;
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| 4 | using System.IO;
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| 5 |
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| 6 | namespace Oni.Sound
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| 7 | {
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| 8 | internal class SoundData
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| 9 | {
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| 10 | public bool IsPCM;
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| 11 | public bool IsIMA4;
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| 12 | public int SampleRate;
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| 13 | public int ChannelCount;
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| 14 | public byte[] Data;
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| 15 |
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| 16 | public UInt16 nGameTicks;
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| 17 |
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| 18 | public int SampleCount; // calculated
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| 19 |
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| 20 | //MS WAV variables
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| 21 | public int AverageDataRate;
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| 22 | public int BlockAlignment;
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| 23 | public int BitsPerSample;
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| 24 | public int HeaderSizeADPCM;
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| 25 |
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| 26 | // optional MSADPCM values
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| 27 | public UInt16 SamplesPerBlock;
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| 28 | public UInt16 nCoefPairs;
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| 29 | public Int16[] CoefADPCMa;
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| 30 | public Int16[] CoefADPCMb;
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| 31 |
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| 32 | public static SoundData Read(InstanceDescriptor sndd, bool do_pc_demo_test)
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| 33 | {
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| 34 | if (sndd.Template.Tag != TemplateTag.SNDD)
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| 35 | throw new ArgumentException("descriptor");
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| 36 |
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| 37 | var sound = new SoundData();
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| 38 |
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| 39 | int dataSize;
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| 40 | int dataOffset;
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| 41 |
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| 42 | using (var reader = sndd.OpenRead())
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| 43 | {
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| 44 | // sample rate
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| 45 | // duration in frames
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| 46 |
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| 47 | // IMA4 or
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| 48 | // MS ADPCM: block size (default 512 for mono, 1024 for stereo, interruptible)
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| 49 |
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| 50 | // sample count (automatic for IMA4 and PC demo)
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| 51 |
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| 52 |
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| 53 | // size in raw / offset in raw
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| 54 | if (sndd.IsMacFile)
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| 55 | {
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| 56 | sound.ChannelCount = (reader.ReadInt32() >> 1) + 1; // TODO: interpret the low bit? (uncompressed/compressed?)
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| 57 | sound.SampleRate = 22050;
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| 58 | sound.nGameTicks = (UInt16)reader.ReadInt32();
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| 59 |
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| 60 | sound.IsIMA4 = true;
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| 61 | sound.IsPCM = false;
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| 62 | }
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| 63 | else
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| 64 | {
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| 65 | sound.IsPCM = false;
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| 66 | reader.Skip(4); // flags (1=?, 2=?, 4=?, 8=compressed) TODO: Try uncompressed (even for demo?)
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| 67 | reader.Skip(2); // Int16; format ID (2= ADPCM, 1=PCM?) TODO: Try uncompressed (even for demo?)
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| 68 | sound.ChannelCount = reader.ReadInt16();
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| 69 | sound.SampleRate = reader.ReadInt32();
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| 70 | sound.AverageDataRate = reader.ReadInt32(); // in B/s (2 or 4 for PCM; 11155, 22311 or 22179 for Vanilla ADPCM)
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| 71 | sound.BlockAlignment = reader.ReadInt16(); // 2 or 4 bytes per block for PCM; 512 or 1024 for Vanilla ADPCM
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| 72 | sound.BitsPerSample = reader.ReadInt16(); // bits per sample per channel (4 bits per sample for ADPCM, 16 bits for PCM)
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| 73 | sound.HeaderSizeADPCM = reader.ReadInt16(); // size of additional (ADPCM) header (zero for PCM); typically 32 bytes
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| 74 |
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| 75 | sound.SamplesPerBlock = reader.ReadUInt16(); // UInt16; samples per block (can be inferred from block alignment etc)
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| 76 |
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| 77 | sound.nCoefPairs = reader.ReadUInt16(); // usually 7
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| 78 | sound.CoefADPCMa = new Int16[sound.nCoefPairs]; // usually 256 512 0 192 240 460 392
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| 79 | sound.CoefADPCMb = new Int16[sound.nCoefPairs]; // usually 0 -256 0 64 0 -208 -232
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| 80 | for (int coefPair = 0; coefPair < sound.nCoefPairs; ++coefPair)
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| 81 | {
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| 82 | sound.CoefADPCMa[coefPair] = reader.ReadInt16();
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| 83 | sound.CoefADPCMb[coefPair] = reader.ReadInt16();
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| 84 | }
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| 85 |
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| 86 | sound.nGameTicks = reader.ReadUInt16(); // UInt16; number of game ticks (truncated to lower value)
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| 87 | sound.IsIMA4 = false;
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| 88 | }
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| 89 |
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| 90 | dataSize = reader.ReadInt32();
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| 91 | dataOffset = reader.ReadInt32();
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| 92 | }
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| 93 |
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| 94 | using (var rawReader = sndd.GetRawReader(dataOffset))
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| 95 | sound.Data = rawReader.ReadBytes(dataSize);
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| 96 |
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| 97 | if (sound.IsIMA4 && do_pc_demo_test) // check if the raw data actually looks like IMA4
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| 98 | {
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| 99 | int nIMABlocks = sound.Data.Length / 34;
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| 100 | int remainder = sound.Data.Length - nIMABlocks * 34;
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| 101 | if (remainder == 0 && (nIMABlocks % sound.ChannelCount) == 0)
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| 102 | {
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| 103 | bool stepIndexAbove88 = false;
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| 104 | for (int ii = 0; ii < nIMABlocks; ii++)
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| 105 | {
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| 106 | Byte cc = sound.Data[ii * 34 + 1];
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| 107 | if ((cc & 0x7F) > 88)
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| 108 | stepIndexAbove88 = true;
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| 109 | }
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| 110 | if (stepIndexAbove88)
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| 111 | sound.IsIMA4 = false;
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| 112 | }
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| 113 | else
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| 114 | sound.IsIMA4 = false;
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| 115 | if (!(sound.IsIMA4)) // fill in default values of WAV (MS ADCPM) header
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| 116 | {
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| 117 | sound.IsPCM = false;
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| 118 | Console.WriteLine("PC-demo MS ADPCM detected; use -nodemo flag to treat as Mac IMA4.");
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| 119 | sound.AverageDataRate = (sound.ChannelCount == 1) ? 11155 : 22311;
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| 120 | sound.BlockAlignment = (sound.ChannelCount == 1) ? 512 : 1024;
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| 121 | sound.BitsPerSample = 4;
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| 122 | sound.SamplesPerBlock = 1012;
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| 123 | sound.HeaderSizeADPCM = 32;
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| 124 | sound.nCoefPairs = 7;
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| 125 | sound.CoefADPCMa = new Int16[7]; // usually 256 512 0 192 240 460 392
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| 126 | sound.CoefADPCMb = new Int16[7]; // usually 0 -256 0 64 0 -208 -232
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| 127 | sound.CoefADPCMa[0] = 256; sound.CoefADPCMb[0] = 0;
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| 128 | sound.CoefADPCMa[1] = 512; sound.CoefADPCMb[1] = -256;
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| 129 | sound.CoefADPCMa[2] = 0; sound.CoefADPCMb[2] = 0;
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| 130 | sound.CoefADPCMa[3] = 192; sound.CoefADPCMb[3] = 64;
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| 131 | sound.CoefADPCMa[4] = 240; sound.CoefADPCMb[4] = 0;
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| 132 | sound.CoefADPCMa[5] = 460; sound.CoefADPCMb[5] = -208;
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| 133 | sound.CoefADPCMa[6] = 392; sound.CoefADPCMb[6] = -232;
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| 134 | }
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| 135 | }
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| 136 | // validate data and calculate sample count
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| 137 | if(sound.IsIMA4) // get the sample count
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| 138 | {
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| 139 | int nIMABlocks = sound.Data.Length / 34 / sound.ChannelCount;
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| 140 | if(sound.Data.Length - nIMABlocks * 34 * sound.ChannelCount > 0)
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| 141 | throw new InvalidDataException("IMA4 data shouldn't have incomplete blocks.");
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| 142 | sound.SampleCount = nIMABlocks * 64;
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| 143 | }
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| 144 | else
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| 145 | {
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| 146 | // TODO: validate all the parameters: resolve conflicts if any, or bail out
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| 147 | // TODO: handle PCM (the following assumes MS ADPCM)
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| 148 | if (sound.IsPCM)
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| 149 | {
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| 150 | }
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| 151 | else
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| 152 | {
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| 153 | int wholeBlocks = sound.Data.Length / sound.BlockAlignment;
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| 154 | int leftoverBytes = sound.Data.Length - (wholeBlocks * sound.BlockAlignment);
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| 155 | int leftoverSamples = 8 * (leftoverBytes - 7 * sound.ChannelCount)
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| 156 | / sound.BitsPerSample / sound.ChannelCount + 2; // assuming 4 bits per sample
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| 157 | sound.SampleCount = wholeBlocks * sound.SamplesPerBlock + leftoverSamples;
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| 158 | }
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| 159 | }
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| 160 | return sound;
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| 161 | }
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| 162 | }
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| 163 | }
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