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76 lines
3.1 KiB
C#
76 lines
3.1 KiB
C#
//! \file AudioEZS.cs
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//! \date 2019 Jan 04
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//! \brief Studio B-Room audio format.
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//
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// Copyright (C) 2019 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System.ComponentModel.Composition;
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namespace GameRes.Formats.BRoom
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{
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[Export(typeof(AudioFormat))]
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public class EzsAudio : AudioFormat
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{
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public override string Tag { get { return "EZS"; } }
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public override string Description { get { return "Studio B-Room audio format"; } }
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public override uint Signature { get { return 0; } }
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public override bool CanWrite { get { return false; } }
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const byte DefaultKey = 0xDD;
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public override SoundInput TryOpen (IBinaryStream file)
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{
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if (!file.Name.HasExtension ("EZS"))
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return null;
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var header = file.ReadHeader (0x1B);
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uint pcm_size = header.ToUInt32 (0);
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if (pcm_size > file.Length)
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return null;
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byte key = header[4];
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var format = new WaveFormat {
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FormatTag = header.ToUInt16 (5),
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Channels = header.ToUInt16 (7),
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SamplesPerSecond = header.ToUInt32 (9),
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AverageBytesPerSecond = header.ToUInt32 (13),
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BlockAlign = header.ToUInt16 (17),
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BitsPerSample = header.ToUInt16 (19),
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};
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ushort cbSize = header.ToUInt16 (21);
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// key ^= DefaultKey;
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key = (byte)cbSize;
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cbSize ^= key;
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format.BitsPerSample ^= key;
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if (format.BitsPerSample != 8 && format.BitsPerSample != 16)
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return null;
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format.AverageBytesPerSecond ^= cbSize;
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format.BlockAlign ^= (ushort)format.AverageBytesPerSecond;
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format.Channels ^= format.BlockAlign;
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if (format.Channels < 1 || format.Channels > 2)
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return null;
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format.SamplesPerSecond ^= format.Channels;
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format.FormatTag ^= format.BitsPerSample;
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var input = new StreamRegion (file.AsStream, 0x1B);
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return new RawPcmInput (input, format);
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}
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}
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}
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