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using System; |
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using System.IO; |
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|
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namespace Oni.Sound |
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{ |
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internal class AifExporter : SoundExporter |
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{ |
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#region Private data |
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private const int fcc_FORM = 0x464f524d; |
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private const int fcc_AIFC = 0x41494643; |
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private const int fcc_COMM = 0x434f4d4d; |
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private const int fcc_ima4 = 0x696d6134; |
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private const int fcc_SSND = 0x53534e44; |
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|
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private static readonly byte[] sampleRate = new byte[10] |
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{ |
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0x40, 0x0d, 0xac, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
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}; |
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|
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#endregion |
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|
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public AifExporter(InstanceFileManager fileManager, string outputDirPath) |
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: base(fileManager, outputDirPath) |
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{ |
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} |
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|
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protected override void ExportInstance(InstanceDescriptor descriptor) |
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{ |
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var sound = SoundData.Read(descriptor); |
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|
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using (var stream = File.Create(Path.Combine(OutputDirPath, descriptor.FullName + ".aif"))) |
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using (var writer = new BinaryWriter(stream)) |
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{ |
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if (!(sound.IsIMA4)) |
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{ |
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throw new NotSupportedException("Transcoding from PC ADPCM to Mac/demo ADPCM not supported!"); |
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} |
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writer.Write(Utils.ByteSwap(fcc_FORM)); |
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writer.Write(Utils.ByteSwap(50 + sound.Data.Length)); |
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writer.Write(Utils.ByteSwap(fcc_AIFC)); |
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|
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// |
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// write COMM chunk |
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// |
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|
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writer.Write(Utils.ByteSwap(fcc_COMM)); |
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writer.Write(Utils.ByteSwap(22)); // chunk size |
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writer.Write(Utils.ByteSwap((short)sound.ChannelCount)); |
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writer.Write(Utils.ByteSwap(sound.Data.Length / (sound.ChannelCount * 34))); // numSampleFrames |
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writer.Write(Utils.ByteSwap((short)16)); // sampleSize |
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writer.Write(sampleRate); // sampleRate |
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writer.Write(Utils.ByteSwap(fcc_ima4)); |
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|
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// |
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// write SSND chunk |
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// |
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|
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writer.Write(Utils.ByteSwap(fcc_SSND)); |
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writer.Write(Utils.ByteSwap(8 + sound.Data.Length)); // chunk size |
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writer.Write(0); |
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writer.Write(0); |
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writer.Write(sound.Data); |
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} |
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} |
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|
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} |
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} |
