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using System; |
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using System.Collections.Generic; |
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using System.Text; |
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|
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namespace Oni.Sound |
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{ |
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internal class SoundData |
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{ |
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public bool IsIMA4; |
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public int SampleRate; |
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public int ChannelCount; |
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public byte[] Data; |
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|
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public static SoundData Read(InstanceDescriptor sndd, bool do_pc_demo_test) |
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{ |
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if (sndd.Template.Tag != TemplateTag.SNDD) |
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throw new ArgumentException("descriptor"); |
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|
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var sound = new SoundData(); |
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|
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int dataSize; |
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int dataOffset; |
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|
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using (var reader = sndd.OpenRead()) |
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{ |
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if (sndd.IsMacFile) |
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{ |
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sound.ChannelCount = (reader.ReadInt32() >> 1) + 1; |
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sound.SampleRate = 22050; |
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reader.Skip(4); |
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sound.IsIMA4 = true; |
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} |
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else |
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{ |
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reader.Skip(6); // ADPCM format identifiers (change to support PCM?) |
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sound.ChannelCount = reader.ReadInt16(); |
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sound.SampleRate = reader.ReadInt32(); |
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reader.Skip(44); |
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sound.IsIMA4 = false; |
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} |
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|
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dataSize = reader.ReadInt32(); |
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dataOffset = reader.ReadInt32(); |
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} |
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|
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using (var rawReader = sndd.GetRawReader(dataOffset)) |
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sound.Data = rawReader.ReadBytes(dataSize); |
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|
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if (sound.IsIMA4 && do_pc_demo_test) // check if the raw data actually looks like IMA4 |
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{ |
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int nIMABlocks = sound.Data.Length / 34; |
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int remainder = sound.Data.Length - nIMABlocks * 34; |
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if (remainder == 0 && (nIMABlocks % sound.ChannelCount) == 0) |
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{ |
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bool stepIndexAbove88 = false; |
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for (int ii = 0; ii < nIMABlocks; ii++) |
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{ |
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Byte cc = sound.Data[ii * 34 + 1]; |
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if ((cc & 0x7F) > 88) |
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stepIndexAbove88 = true; |
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} |
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if (stepIndexAbove88) |
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sound.IsIMA4 = false; |
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} |
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else |
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sound.IsIMA4 = false; |
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if (!(sound.IsIMA4)) |
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Console.WriteLine("PC-demo MS ADPCM detected; use -nodemo flag to treat as IMA4."); |
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} |
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|
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return sound; |
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} |
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} |
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} |
