public void ChangeNumberOfAudioChannels_CreatesFile()
{
using (var file = TempFile.FromResource(Resources._2Channel, ".wav"))
{
var outputPath = file.Path.Replace(".wav", "1ch.wav");
FFmpegRunner.ChangeNumberOfAudioChannels(file.Path, outputPath, 1, new NullProgress());
Assert.IsTrue(File.Exists(outputPath));
}
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// It's up to the caller to close and dispose of the stream.
/// </summary>
/// ------------------------------------------------------------------------------------
public static WaveStream GetOneChannelStreamFromAudio(string audioFilePath,
out Exception error, IProgress progress)
{
error = null;
try
{
var stream = new WaveFileReader(audioFilePath);
if (stream.WaveFormat.Channels == 1 || !FFmpegRunner.HaveNecessaryComponents)
{
return(stream);
}
}
catch (Exception e)
{
error = e;
return(null);
}
var tmpFile = Path.Combine(Path.GetTempPath(), Path.GetFileName(audioFilePath));
if (File.Exists(tmpFile))
{
File.Delete(tmpFile);
}
try
{
FFmpegRunner.ChangeNumberOfAudioChannels(audioFilePath, tmpFile, 1, progress);
// WaveFileReader does not read the entire file into a buffer right away. Therefore,
// the file will remain open but we want to delete it right away. So read it
// into our own stream and pass that to WaveFileReader so the file is no longer
// needed and can be deleted.
return(new WaveFileReader(new MemoryStream(File.ReadAllBytes(tmpFile))));
}
catch (Exception e)
{
error = e;
return(null);
}
finally
{
if (File.Exists(tmpFile))
{
try { File.Delete(tmpFile); }
catch { }
}
}
}