GARbro-mirror/GameRes/AudioWAV.cs

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//! \file AudioWAV.cs
//! \date Tue Nov 04 18:22:37 2014
//! \brief WAVE audio format implementation.
//
// Copyright (C) 2014-2015 by morkt
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//
// 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;
using System.IO;
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using System.Text;
using NAudio.Wave;
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namespace GameRes
{
public class WaveInput : SoundInput
{
WaveStream m_reader;
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public override long Position
{
get { return m_reader.Position; }
set { m_reader.Position = value; }
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}
public override bool CanSeek { get { return m_reader.CanSeek; } }
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public override int SourceBitrate
{
get { return (int)Format.AverageBytesPerSecond * 8; }
}
public override string SourceFormat { get { return "wav"; } }
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public WaveInput (Stream file) : base (file)
{
m_reader = new WaveFileReader (file);
var wf = m_reader.WaveFormat;
if (WaveFormatEncoding.Adpcm == wf.Encoding || WaveFormatEncoding.MuLaw == wf.Encoding) // 2 || 7
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{
var wav = WaveFormatConversionStream.CreatePcmStream (m_reader);
wf = wav.WaveFormat;
m_reader = wav;
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}
var format = new GameRes.WaveFormat();
format.FormatTag = (ushort)wf.Encoding;
format.Channels = (ushort)wf.Channels;
format.SamplesPerSecond = (uint)wf.SampleRate;
format.BitsPerSample = (ushort)wf.BitsPerSample;
format.BlockAlign = (ushort)wf.BlockAlign;
format.AverageBytesPerSecond = (uint)wf.AverageBytesPerSecond;
this.Format = format;
this.PcmSize = m_reader.Length;
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}
public override int Read (byte[] buffer, int offset, int count)
{
return m_reader.Read (buffer, offset, count);
}
#region IDisposable Members
protected override void Dispose (bool disposing)
{
if (null != m_reader)
{
if (disposing)
{
m_reader.Dispose();
}
m_reader = null;
base.Dispose (disposing);
}
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}
#endregion
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}
[Export(typeof(AudioFormat))]
public class WaveAudio : AudioFormat
{
public override string Tag { get { return "WAV"; } }
public override string Description { get { return "Wave audio format"; } }
public override uint Signature { get { return 0x46464952; } } // 'RIFF'
public override SoundInput TryOpen (Stream file)
{
SoundInput sound = new WaveInput (file);
if (0x674f == sound.Format.FormatTag || 0x6771 == sound.Format.FormatTag // Vorbis
|| 0x0055 == sound.Format.FormatTag) // MpegLayer3
{
try
{
var embedded = AudioFormat.Read (sound);
if (null != embedded)
{
sound.Dispose();
sound = embedded;
}
}
catch { /* ignore errors */ }
}
return sound;
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}
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public override void Write (SoundInput source, Stream output)
{
using (var buffer = new BinaryWriter (output, Encoding.ASCII, true))
{
uint total_size = (uint)(0x2e - 8 + source.PcmSize);
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buffer.Write (Signature);
buffer.Write (total_size);
buffer.Write (0x45564157); // 'WAVE'
buffer.Write (0x20746d66); // 'fmt '
buffer.Write (0x12);
buffer.Write (source.Format.FormatTag);
buffer.Write (source.Format.Channels);
buffer.Write (source.Format.SamplesPerSecond);
buffer.Write (source.Format.AverageBytesPerSecond);
buffer.Write (source.Format.BlockAlign);
buffer.Write (source.Format.BitsPerSample);
buffer.Write ((ushort)0);
buffer.Write (0x61746164); // 'data'
buffer.Write (source.PcmSize);
source.Position = 0;
source.CopyTo (output);
}
}
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}
}