public void Initialize(Stream stream, AudioInfo info, AudioMetadata metadata, SettingDictionary settings)
{
InitializeReplayGainFilter(info, metadata, settings);
_oggStream = new OggStream(settings.TryGetValue("SerialNumber", out int serialNumber)
? serialNumber
: new Random().Next());
// Default to a quality setting of 5
if (settings.TryGetValue("BitRate", out int bitRate))
{
if (settings.TryGetValue("ForceCBR", out bool cbr) && cbr)
{
_encoder = new VorbisEncoder(info.Channels, info.SampleRate,
bitRate * 1000, bitRate * 1000, bitRate * 1000);
}
else
{
_encoder = new VorbisEncoder(info.Channels, info.SampleRate,
-1, bitRate * 1000, -1);
}
}
else
{
_encoder = new VorbisEncoder(info.Channels, info.SampleRate,
settings.TryGetValue("Quality", out int quality)
? quality / 10f
: 0.5f);
}
// Generate the header
using (var comment = new MetadataToVorbisCommentAdapter(metadata))
{
comment.HeaderOut(_encoder.DspState, out var first, out var second, out var third);
_oggStream.PacketIn(first);
_oggStream.PacketIn(second);
_oggStream.PacketIn(third);
}
// Buffer the header in memory
using (var tempStream = new MemoryStream())
{
_outputStream = tempStream;
// ReSharper disable once PossibleNullReferenceException
while (_oggStream.Flush(out var page))
{
WritePage(page);
}
// Pre-allocate the whole stream (estimate worst case of 500kbps, plus the header)
stream.SetLength(0xFA00 * (long)info.PlayLength.TotalSeconds + tempStream.Length);
// Flush the headers to the output stream
tempStream.WriteTo(stream);
}
_outputStream = stream;
}
void WriteFrames(int frames)
{
// ReSharper disable once PossibleNullReferenceException
_encoder.Wrote(frames);
while (_encoder.BlockOut())
{
_encoder.Analysis(IntPtr.Zero);
_encoder.AddBlock();
// ReSharper disable once PossibleNullReferenceException
while (_encoder.FlushPacket(out var packet))
{
// ReSharper disable once PossibleNullReferenceException
_oggStream.PacketIn(packet);
// ReSharper disable once PossibleNullReferenceException
while (_oggStream.PageOut(out var page))
{
WritePage(page);
}
}
}
}