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#region Copyright & License Information | ||
/* | ||
* Copyright 2007-2021 The OpenRA Developers (see AUTHORS) | ||
* This file is part of OpenRA, which is free software. It is made | ||
* available to you under the terms of the GNU General Public License | ||
* as published by the Free Software Foundation, either version 3 of | ||
* the License, or (at your option) any later version. For more | ||
* information, see COPYING. | ||
*/ | ||
#endregion | ||
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using System; | ||
using System.IO; | ||
using NVorbis; | ||
using OpenRA.Primitives; | ||
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namespace OpenRA.Mods.Common.AudioLoaders | ||
{ | ||
public class OggLoader : ISoundLoader | ||
{ | ||
bool ISoundLoader.TryParseSound(Stream stream, out ISoundFormat sound) | ||
{ | ||
try | ||
{ | ||
sound = new OggFormat(stream); | ||
return true; | ||
} | ||
catch | ||
{ | ||
// Unsupported file | ||
} | ||
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sound = null; | ||
return false; | ||
} | ||
} | ||
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public sealed class OggFormat : ISoundFormat | ||
{ | ||
public int SampleBits => 16; | ||
public int Channels => reader.Channels; | ||
public int SampleRate => reader.SampleRate; | ||
public float LengthInSeconds => (float)reader.TotalTime.TotalSeconds; | ||
public Stream GetPCMInputStream() { return new OggStream(new OggFormat(this)); } | ||
public void Dispose() { reader.Dispose(); } | ||
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readonly VorbisReader reader; | ||
readonly Stream stream; | ||
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public OggFormat(Stream stream) | ||
{ | ||
this.stream = stream; | ||
reader = new VorbisReader(stream); | ||
} | ||
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OggFormat(OggFormat cloneFrom) | ||
{ | ||
stream = SegmentStream.CreateWithoutOwningStream(cloneFrom.stream, 0, (int)cloneFrom.stream.Length); | ||
reader = new VorbisReader(stream) | ||
{ | ||
// Tell NVorbis to clip samples so we don't have to range-check during reading. | ||
ClipSamples = true | ||
}; | ||
} | ||
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public class OggStream : Stream | ||
{ | ||
readonly OggFormat format; | ||
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// This buffer can be static because it can only be used by 1 instance per thread. | ||
[ThreadStatic] | ||
static float[] conversionBuffer = null; | ||
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public OggStream(OggFormat format) | ||
{ | ||
this.format = format; | ||
} | ||
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public override bool CanRead => true; | ||
public override bool CanSeek => false; | ||
public override bool CanWrite => false; | ||
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public override long Length => format.reader.TotalSamples; | ||
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public override long Position | ||
{ | ||
get => format.reader.SamplePosition; | ||
set => throw new NotImplementedException(); | ||
} | ||
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public override int Read(byte[] buffer, int offset, int count) | ||
{ | ||
// Adjust count so it is in 16-bit samples instead of bytes. | ||
count /= 2; | ||
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// Make sure we don't have an odd count. | ||
count -= count % format.reader.Channels; | ||
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// Get the buffer, creating a new one if none exists or the existing one is too small. | ||
var floatBuffer = conversionBuffer ?? (conversionBuffer = new float[count]); | ||
if (floatBuffer.Length < count) | ||
floatBuffer = conversionBuffer = new float[count]; | ||
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// Let NVorbis do the actual reading. | ||
var samples = format.reader.ReadSamples(floatBuffer, offset, count); | ||
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// Move the data back to the request buffer and convert to 16-bit signed samples for OpenAL. | ||
for (var i = 0; i < samples; i++) | ||
{ | ||
var conversion = (short)(floatBuffer[i] * 32767); | ||
buffer[offset++] = (byte)(conversion & 255); | ||
buffer[offset++] = (byte)(conversion >> 8); | ||
} | ||
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// Adjust count back to bytes. | ||
return samples * 2; | ||
} | ||
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public override void Flush() { throw new NotImplementedException(); } | ||
public override long Seek(long offset, SeekOrigin origin) { throw new NotImplementedException(); } | ||
public override void SetLength(long value) { throw new NotImplementedException(); } | ||
public override void Write(byte[] buffer, int offset, int count) { throw new NotImplementedException(); } | ||
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protected override void Dispose(bool disposing) | ||
{ | ||
if (disposing) | ||
format.reader.Dispose(); | ||
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base.Dispose(disposing); | ||
} | ||
} | ||
} | ||
} |
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