public Stream ConvertToMP3(string inputFile, ConvertOptions options)
{
var temp = Path.GetTempFileName();
TemporaryFiles.Add(temp);
Convert(inputFile, ".mp3", "-f mp3 " + options + " -y", temp);
return(File.OpenRead(temp));
}
public Stream ConvertToHeaderlessWav(string inputFile, ConvertOptions options)
{
var temp = Path.GetTempFileName();
TemporaryFiles.Add(temp);
Convert(inputFile, ".wav", "-f s16le " + options + " -y", temp);
return(File.OpenRead(temp));
}
public void ConvertToMP3Async(string inputFile, ConvertOptions options, object userState = null)
{
if (_async != null)
{
throw new InvalidOperationException("Conversion is already in progress.");
}
_async = AsyncOperationManager.CreateOperation(userState);
ThreadPool.QueueUserWorkItem(x => OnConversionCompleted(new ConversionCompletedEventArgs {
Output = ConvertToMP3(inputFile, options), State = _async.UserSuppliedState
}));
}
public Stream ConvertToFLAC(string inputFile, ConvertOptions options)
{
// Convering to FLAC is a 2-way step. First we convert to WAV.
var output = Convert(inputFile, ".wav", "-f wav -sample_fmt s16 " + options, null);
if (output.Length == 0)
{
return(output);
}
FormatRepair.RepairWAVStream(output);
// Offset the memory to temp folder.
var temp = Path.GetTempFileName();
var fs = File.Open(temp, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
TemporaryFiles.Add(temp);
// Next we encode using libFLAC's native encoder because FFmpeg unfortunately
// does not support --no-padding and --no-seektable at the moment. *sigh*
using (var reader = new WavReader(output))
using (var writer = new FlacWriter(fs, reader.BitDepth, reader.Channels, reader.SampleRate))
{
// Buffer for 1 second's worth of audio data
var buffer = new byte[1 * reader.Bitrate / 8];
int read;
do
{
OnConversionProgressChanged(new ConversionProgressChangedEventArgs {
SourceFormat = ".wav",
TargetFormat = ".flac",
Progress = (int)(reader.InputStream.Position * 100 / reader.InputStream.Length)
});
read = reader.InputStream.Read(buffer, 0, buffer.Length);
writer.Write(buffer, 0, read);
} while (read > 0);
}
output.Close();
return(fs);
}
