180 lines
6.7 KiB
C#

//! \file AudioOGG.cs
//! \date Fri Nov 07 00:32:15 2014
//! \brief NVorbis wrapper for GameRes.
//
// Copyright (C) 2014 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;
using System.Linq;
using NVorbis;
namespace GameRes.Formats
{
public class OggInput : SoundInput
{
VorbisReader m_reader;
public override long Position
{
get
{
return (long)(m_reader.DecodedTime.TotalSeconds * m_reader.SampleRate * m_reader.Channels * sizeof(float));
}
set
{
if (value < 0 || value > Length) throw new ArgumentOutOfRangeException("value");
m_reader.DecodedTime = TimeSpan.FromSeconds((double)value / m_reader.SampleRate / m_reader.Channels / sizeof(float));
}
}
public override bool CanSeek { get { return Source.CanSeek; } }
public override int SourceBitrate
{
get { return m_reader.NominalBitrate; }
}
public override string SourceFormat { get { return "ogg"; } }
public OggInput (Stream file) : base (file)
{
m_reader = new VorbisReader (Source, false);
var format = new GameRes.WaveFormat();
format.FormatTag = 3; // WAVE_FORMAT_IEEE_FLOAT
format.Channels = (ushort)m_reader.Channels;
format.SamplesPerSecond = (uint)m_reader.SampleRate;
format.BitsPerSample = 32;
format.BlockAlign = (ushort)(4 * format.Channels);
format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlign;
this.Format = format;
this.PcmSize = (long)(m_reader.TotalTime.TotalSeconds * format.SamplesPerSecond * format.Channels * sizeof(float));
}
public override void Reset ()
{
m_reader.DecodedTime = TimeSpan.FromSeconds (0);
}
// This buffer can be static because it can only be used by 1 instance per thread
[ThreadStatic]
static float[] _conversionBuffer = null;
public override int Read(byte[] buffer, int offset, int count)
{
// adjust count so it is in floats instead of bytes
count /= sizeof(float);
// make sure we don't have an odd count
count -= count % m_reader.Channels;
// get the buffer, creating a new one if none exists or the existing one is too small
var cb = _conversionBuffer ?? (_conversionBuffer = new float[count]);
if (cb.Length < count)
{
cb = (_conversionBuffer = new float[count]);
}
// let ReadSamples(float[], int, int) do the actual reading; adjust count back to bytes
int cnt = m_reader.ReadSamples (cb, 0, count) * sizeof(float);
// move the data back to the request buffer
Buffer.BlockCopy (cb, 0, buffer, offset, cnt);
// done!
return cnt;
}
#region IDisposable Members
bool _ogg_disposed = false;
protected override void Dispose (bool disposing)
{
if (!_ogg_disposed)
{
if (disposing)
{
m_reader.Dispose();
}
_ogg_disposed = true;
base.Dispose (disposing);
}
}
#endregion
}
[Export(typeof(AudioFormat))]
public class OggAudio : AudioFormat
{
public override string Tag { get { return "OGG"; } }
public override string Description { get { return "Ogg/Vorbis audio format"; } }
public override uint Signature { get { return 0x5367674f; } } // 'OggS'
public override bool CanWrite { get { return false; } }
public OggAudio ()
{
Signatures = new uint[] { 0x5367674F, 0 };
}
public override SoundInput TryOpen (IBinaryStream file)
{
Stream input = file.AsStream;
if (file.Signature == Wav.Signature)
{
var header = file.ReadHeader (0x14);
if (!header.AsciiEqual (8, "WAVEfmt "))
return null;
uint fmt_size = header.ToUInt32 (0x10);
long fmt_pos = file.Position;
ushort format = file.ReadUInt16();
if (format != 0x676F && format != 0x6770 && format != 0x6771)
return null;
// interpret WAVE 'data' section as Ogg stream
file.Position = fmt_pos + ((fmt_size + 1) & ~1);
for (;;) // ended by end-of-stream exception
{
uint section_id = file.ReadUInt32();
uint section_size = file.ReadUInt32();
if (section_id == 0x61746164) // 'data'
{
long ogg_pos = file.Position;
uint id = file.ReadUInt32();
if (id != Signature)
return null;
input = new StreamRegion (input, ogg_pos, section_size);
break;
}
file.Seek ((section_size + 1) & ~1u, SeekOrigin.Current);
}
}
else if (file.Signature != this.Signature)
return null;
return new OggInput (input);
}
public static AudioFormat Instance { get { return s_OggFormat.Value; } }
static readonly ResourceInstance<AudioFormat> s_OggFormat = new ResourceInstance<AudioFormat> ("OGG");
}
}