GARbro-mirror/ArcFormats/AnimeGameSystem/AudioPCM.cs

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//! \file AudioPCM.cs
//! \date Thu Nov 05 05:33:48 2015
//! \brief AnimeGameSystem raw PCM audio.
//
// Copyright (C) 2015 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;
using System.ComponentModel.Composition;
using System.IO;
namespace GameRes.Formats.Ags
{
[Export(typeof(AudioFormat))]
public class PcmAudio : AudioFormat
{
public override string Tag { get { return "PCM/AGS"; } }
public override string Description { get { return "AnimeGameSystem PCM audio"; } }
public override uint Signature { get { return 0; } }
public PcmAudio ()
{
Extensions = new string[] { "pcm" };
}
public override SoundInput TryOpen (Stream file)
{
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uint signature = FormatCatalog.ReadSignature (file) & 0xF0FFFFFF;
if (0x564157 != signature) // 'WAV'
return null;
return new PcmInput (file);
}
}
public class PcmInput : SoundInput
{
public override string SourceFormat { get { return "raw"; } }
public override int SourceBitrate
{
get { return (int)Format.AverageBytesPerSecond * 8; }
}
public PcmInput (Stream file) : base (null)
{
file.Position = 3;
int type = file.ReadByte();
int data_length = (int)file.Length - 4;
var format = new WaveFormat();
format.FormatTag = 1;
format.Channels = (ushort)((type & 1) + 1);
type &= ~1;
if (0xA == type)
{
format.SamplesPerSecond = 44100;
format.BitsPerSample = 16;
}
else if (6 == type)
{
format.SamplesPerSecond = 22050;
format.BitsPerSample = 16;
}
else if (4 == type)
{
format.SamplesPerSecond = 22050;
format.BitsPerSample = 8;
}
else
throw new NotSupportedException ("Not supported PCM format");
format.BlockAlign = (ushort)(format.Channels*format.BitsPerSample/8);
format.AverageBytesPerSecond = format.SamplesPerSecond*format.BlockAlign;
this.Format = format;
this.PcmSize = data_length;
this.Source = new StreamRegion (file, 4, data_length);
}
#region IO.Stream methods
public override long Position
{
get { return Source.Position; }
set { Source.Position = value; }
}
public override bool CanSeek { get { return Source.CanSeek; } }
public override long Seek (long offset, SeekOrigin origin)
{
return Source.Seek (offset, origin);
}
public override int Read (byte[] buffer, int offset, int count)
{
return Source.Read (buffer, offset, count);
}
public override int ReadByte ()
{
return Source.ReadByte();
}
#endregion
}
}