/// <summary>
/// Decode a signal from the specified file.
/// </summary>
///
/// <param name="fileName">File name to read signal from.</param>
/// <param name="frameInfo">Information about the decoded signal.</param>
///
/// <returns>Return decoded signal.</returns>
///
public static Signal DecodeFromFile(string fileName, out FrameInfo frameInfo)
{
string fileExtension = FormatDecoderAttribute.GetNormalizedExtension(fileName);
IAudioDecoder decoder = FormatDecoderAttribute.GetDecoders(fileExtension, decoderTypes, decoders.Value);
if (decoder != null)
{
// open stream
using (FileStream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
// open decoder
decoder.Open(stream);
// read all audio frames
Signal signal = decoder.Decode();
decoder.Close();
frameInfo = new FrameInfo(signal.NumberOfChannels, signal.SampleRate, Signal.GetSampleSize(signal.SampleFormat), 0, signal.Length);
return(signal);
}
}
throw new ArgumentException(String.Format("No suitable decoder has been found for the file format {0}. If ", fileExtension) +
"you are trying to decode .wav files, please add a reference to Accord.Audio.DirectSound. You might need to instantiate" +
"at least one type from this assembly to make sure it has been loaded in the AppDomain of your applicatoin.", "fileName");
}
/// <summary>
/// Decode first frame for the specified file.
/// </summary>
///
/// <param name="fileName">File name to read image from.</param>
/// <param name="imageInfo">Information about the decoded image.</param>
///
/// <returns>Return decoded image. In the case if file format support multiple
/// frames, the method return the first frame.</returns>
///
/// <remarks><para>The method uses table of registered image decoders to find the one,
/// which should be used for the specified file. If there is not appropriate decoder
/// found, the method uses default .NET's image decoding routine (see
/// <see cref="System.Drawing.Image.FromFile(string)"/>).</para></remarks>
///
public static Bitmap DecodeFromFile(string fileName, out ImageInfo imageInfo)
{
string fileExtension = FormatDecoderAttribute.GetNormalizedExtension(fileName);
IImageDecoder decoder = FormatDecoderAttribute.GetDecoders(fileExtension, decoderTypes, decoders.Value);
if (decoder != null)
{
// open stream
using (FileStream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
// open decoder
decoder.Open(stream);
// read the first frame from the image
Bitmap bitmap = decoder.DecodeFrame(0, out imageInfo);
// close the decoder and return the bitmap
decoder.Close();
return(bitmap);
}
}
else
{
// use default .NET's image decoding routine
Bitmap bitmap = FromFile(fileName);
decoderTypes[fileExtension] = null; // mark that the file could be loaded using default .NET decoders
imageInfo = new ImageInfo(bitmap.Width, bitmap.Height, Image.GetPixelFormatSize(bitmap.PixelFormat), 0, 1);
return(bitmap);
}
}