static void ValidateSettings(SettingsDictionary settings, ISampleEncoder encoder)
{
Contract.Requires(settings != null);
Contract.Requires(encoder != null);
foreach (string unsupportedKey in settings.Keys.Where(setting =>
!encoder.EncoderInfo.AvailableSettings.Contains(setting, StringComparer.OrdinalIgnoreCase)))
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
Resources.ExportableAudioFileSettingsError, unsupportedKey));
}
}
void DoExport(ISampleEncoder encoder, Stream outputStream, SettingsDictionary settings, CancellationToken cancelToken)
{
Contract.Requires(encoder != null);
Contract.Requires(outputStream != null);
Contract.Requires(settings != null);
encoder.Initialize(outputStream, AudioInfo, Metadata, settings);
using (FileStream inputStream = FileInfo.OpenRead())
{
// Try each decoder that supports this file extension:
foreach (ExportFactory <ISampleDecoder> decoderFactory in
ExtensionProvider.GetFactories <ISampleDecoder>("Extension", FileInfo.Extension))
{
try
{
using (ExportLifetimeContext <ISampleDecoder> decoderLifetime = decoderFactory.CreateExport())
{
ISampleDecoder sampleDecoder = decoderLifetime.Value;
sampleDecoder.Initialize(inputStream);
sampleDecoder.ReadWriteParallel(encoder, cancelToken, encoder.ManuallyFreesSamples);
return;
}
}
catch (UnsupportedAudioException)
{
// If a decoder wasn't supported, rewind the stream and try another:
inputStream.Position = 0;
}
}
throw new UnsupportedAudioException(Resources.AudioFileDecodeError);
}
}
static FileInfo GetOutputFileInfo(FileInfo inputFileInfo, DirectoryInfo outputDirectory, string outputFileName, ISampleEncoder sampleEncoder)
{
Contract.Requires(inputFileInfo != null);
Contract.Requires(sampleEncoder != null);
Contract.Ensures(Contract.Result <FileInfo>() != null);
// Use the input file name if the output name wasn't specified:
if (string.IsNullOrEmpty(outputFileName))
{
outputFileName = Path.GetFileNameWithoutExtension(inputFileInfo.Name);
}
// Use the input file's directory if the output directory wasn't specified:
if (outputDirectory == null)
{
outputDirectory = new DirectoryInfo(inputFileInfo.DirectoryName ?? string.Empty);
}
else
{
outputDirectory.Create();
}
return(new FileInfo(Path.Combine(outputDirectory.FullName, outputFileName + sampleEncoder.EncoderInfo.FileExtension)));
}
