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mirror of https://github.com/crskycode/GARbro.git synced 2024-12-23 03:14:13 +08:00

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3.1 KiB
C#

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