/// <summary>
/// Returns a fully initialized <see cref="IWaveSource" /> instance which is able to decode the specified file. If the
/// specified file can not be decoded, this method throws an <see cref="NotSupportedException" />.
/// </summary>
/// <param name="filename">Filename of the specified file.</param>
/// <returns>Fully initialized <see cref="IWaveSource" /> instance which is able to decode the specified file.</returns>
/// <exception cref="NotSupportedException">The codec of the specified file is not supported.</exception>
public IWaveSource GetCodec(string filename)
{
if (String.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
if (!File.Exists(filename))
{
throw new FileNotFoundException("File not found.", filename);
}
string extension = Path.GetExtension(filename).Remove(0, 1); //get the extension without the "dot".
IWaveSource source = null;
if (File.Exists(filename))
{
Stream stream = File.OpenRead(filename);
try
{
foreach (var codecEntry in _codecs)
{
try
{
if (
codecEntry.Value.FileExtensions.Any(
x => x.Equals(extension, StringComparison.OrdinalIgnoreCase)))
{
source = codecEntry.Value.GetCodecAction(stream);
if (source != null)
{
break;
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
}
finally
{
if (source == null)
{
stream.Dispose();
}
else
{
source = new DisposeFileStreamSource(source, stream);
}
}
}
if (source != null)
{
return(source);
}
return(Default(filename));
}
/// <summary>
/// Returns a fully initialized <see cref="IWaveSource" /> instance which is able to decode the specified file. If the
/// specified file can not be decoded, this method throws an <see cref="NotSupportedException" />.
/// </summary>
/// <param name="filename">Filename of the specified file.</param>
/// <returns>Fully initialized <see cref="IWaveSource" /> instance which is able to decode the specified file.</returns>
/// <exception cref="NotSupportedException">The codec of the specified file is not supported.</exception>
public IWaveSource GetCodec(string filename)
{
if (String.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
if (!File.Exists(filename))
{
throw new FileNotFoundException("File not found.", filename);
}
string extension = Path.GetExtension(filename).Remove(0, 1); //get the extension without the "dot".
IWaveSource source = null;
if (File.Exists(filename))
{
Log.Verbose("Processing {0}", filename);
Stream stream = File.OpenRead(filename);
try
{
// test for some predefined headers
// to support audio files that have the wrong exension
// i.e. aiff files that are really wav files etc.
using (var reader = new BinaryReader(stream, Encoding.ASCII, true))
{
var fileChunkId = new String(reader.ReadChars(4));
var lowerCaseExtension = extension.ToLowerInvariant();
// wav files have RIFF
if (fileChunkId.Equals("RIFF") && !lowerCaseExtension.Contains("wav"))
{
extension = "wav";
}
// aif files have FORM
if (fileChunkId.Equals("FORM") && !lowerCaseExtension.Contains("aif"))
{
extension = "aif";
}
// ogg files have OggS
if (fileChunkId.Equals("OggS") && !lowerCaseExtension.Contains("ogg"))
{
extension = "ogg";
}
// mp3 files have ID3 and end of text character (\u0003)
if (fileChunkId.Equals("ID3\u0003") && !lowerCaseExtension.Contains("mp3"))
{
extension = "mp3";
}
// flac files have fLaC
if (fileChunkId.Equals("fLaC") && !lowerCaseExtension.Contains("fla"))
{
extension = "flac";
}
stream.Position -= 4;
}
foreach (var codecEntry in _codecs)
{
try
{
if (
codecEntry.Value.FileExtensions.Any(
x => x.Equals(extension, StringComparison.OrdinalIgnoreCase)))
{
source = codecEntry.Value.GetCodecAction(stream);
if (source != null)
{
break;
}
}
}
catch (Exception ex)
{
Log.Warning(ex.Message);
}
}
}
finally
{
if (source == null)
{
stream.Dispose();
}
else
{
source = new DisposeFileStreamSource(source, stream);
}
}
}
if (source != null)
{
return(source);
}
throw new ArgumentException("No codecs found that could process the source.");
}
