mirror of
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205 lines
6.2 KiB
C#
205 lines
6.2 KiB
C#
//! \file Audio.cs
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//! \date Tue Nov 04 17:35:54 2014
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//! \brief audio format class.
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//
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// Copyright (C) 2014 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;
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using System.IO;
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using System.Linq;
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namespace GameRes
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{
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public struct WaveFormat
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{
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public ushort FormatTag;
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public ushort Channels;
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public uint SamplesPerSecond;
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public uint AverageBytesPerSecond;
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public ushort BlockAlign;
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public ushort BitsPerSample;
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public ushort ExtraSize;
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public void SetBPS ()
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{
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AverageBytesPerSecond = (uint)(SamplesPerSecond * Channels * BitsPerSample / 8);
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}
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}
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public abstract class SoundInput : Stream
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{
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public abstract int SourceBitrate { get; }
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public abstract string SourceFormat { get; }
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public WaveFormat Format { get; protected set; }
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public Stream Source { get; protected set; }
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public long PcmSize { get; protected set; }
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protected SoundInput (Stream input)
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{
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Source = input;
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}
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public virtual void Reset ()
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{
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Position = 0;
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}
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#region System.IO.Stream methods
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public override bool CanRead { get { return Source.CanRead; } }
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public override bool CanWrite { get { return false; } }
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public override long Length { get { return PcmSize; } }
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public override void Flush()
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{
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Source.Flush();
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}
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public override long Seek(long offset, SeekOrigin origin)
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{
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if (origin == SeekOrigin.Begin)
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Position = offset;
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else if (origin == SeekOrigin.Current)
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Position += offset;
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else
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Position = Length + offset;
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return Position;
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}
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public override void SetLength (long length)
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{
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throw new System.NotSupportedException ("SoundInput.SetLength method is not supported");
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new System.NotSupportedException ("SoundInput.Write method is not supported");
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}
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public override void WriteByte (byte value)
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{
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throw new System.NotSupportedException ("SoundInput.WriteByte method is not supported");
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}
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#endregion
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#region IDisposable Members
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bool disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing)
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{
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Source.Dispose();
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}
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disposed = true;
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base.Dispose (disposing);
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}
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}
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#endregion
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}
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/// <summary>
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/// Class representing raw PCM sound input.
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/// </summary>
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public class RawPcmInput : SoundInput
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{
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public override string SourceFormat { get { return "raw"; } }
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public override int SourceBitrate
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{
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get { return (int)Format.AverageBytesPerSecond * 8; }
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}
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public RawPcmInput (Stream file, WaveFormat format) : base (file)
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{
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this.Format = format;
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this.PcmSize = file.Length;
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}
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#region IO.Stream methods
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public override long Position
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{
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get { return Source.Position; }
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set { Source.Position = value; }
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}
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public override bool CanSeek { get { return Source.CanSeek; } }
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public override long Seek (long offset, SeekOrigin origin)
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{
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return Source.Seek (offset, origin);
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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return Source.Read (buffer, offset, count);
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}
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public override int ReadByte ()
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{
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return Source.ReadByte();
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}
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#endregion
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}
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public abstract class AudioFormat : IResource
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{
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public override string Type { get { return "audio"; } }
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public abstract SoundInput TryOpen (IBinaryStream file);
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public virtual void Write (SoundInput source, Stream output)
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{
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throw new System.NotImplementedException ("AudioFormat.Write not implemenented");
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}
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public static SoundInput Read (IBinaryStream file)
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{
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foreach (var impl in FormatCatalog.Instance.FindFormats<AudioFormat> (file.Name, file.Signature))
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{
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try
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{
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file.Position = 0;
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SoundInput sound = impl.TryOpen (file);
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if (null != sound)
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return sound;
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}
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catch (OperationCanceledException)
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{
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throw;
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}
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catch (System.Exception X)
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{
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FormatCatalog.Instance.LastError = X;
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}
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}
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return null;
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}
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public static AudioFormat Wav { get { return s_WavFormat.Value; } }
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static readonly Lazy<AudioFormat> s_WavFormat = new Lazy<AudioFormat> (() => FormatCatalog.Instance.AudioFormats.FirstOrDefault (x => x.Tag == "WAV"));
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}
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}
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