public FlacStream(Stream baseStream, bool keepOpen, int bitsPerSample)
{
this.baseStream = baseStream;
this.keepOpen = keepOpen;
this.bitsPerSample = bitsPerSample;
reader = new FlacReader(baseStream, true);
reader.RecordType = FlacBox.FlacRecordType.FrameFooter;
writer = new FlacWriter(baseStream, true);
}
/**
* If a FlacWriter object currently exists, stops it and removes the
* InProgress suffix from its file name.
*/
private void MaybeEndCurrentFlacWriter()
{
lock (flacLock)
{
if (flacWriter == null)
{
return;
}
flacWriter.EndStream();
flacStream.Close();
File.Move(
flacFilePath,
FileNaming.RemoveInProgressSuffix(flacFilePath));
flacFilePath = null;
flacStream = null;
flacWriter = null;
}
}
/** Creates a FlacWriter object if none currently exists. */
private void MaybeCreateFlacWriter()
{
if (flacWriter != null)
{
return;
}
flacFilePath = flacFilePath = FileNaming.AddInProgressSuffix(
FileNaming.GetMicWavInFilePath(dataDir));
flacStream = File.Create(flacFilePath);
flacWriter = new FlacWriter(flacStream);
FlacStreaminfo streamInfo = new()
{
ChannelsCount = AUDIO_NUM_CHANNELS,
BitsPerSample = AUDIO_BITS_PER_SAMPLE,
SampleRate = AUDIO_SAMPLE_RATE_HZ,
MaxBlockSize = AUDIO_SAMPLE_RATE_HZ,
};
flacWriter.StartStream(streamInfo);
}
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);
}
