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; }
public void Initialize(Stream stream, AudioInfo info, AudioMetadata metadata, SettingDictionary settings) { InitializeReplayGainFilter(info, metadata, settings); if (!settings.TryGetValue("SerialNumber", out int serialNumber)) #if NETSTANDARD2_0 { using (var random = RandomNumberGenerator.Create()) { var buffer = new byte[sizeof(int)]; random.GetNonZeroBytes(buffer); serialNumber = BitConverter.ToInt32(buffer, 0); } } #else { serialNumber = RandomNumberGenerator.GetInt32(int.MaxValue); } #endif _oggStream = new(serialNumber); // Default to a quality setting of 5 if (settings.TryGetValue("BitRate", out int bitRate)) { if (settings.TryGetValue("ForceCBR", out bool cbr) && cbr) { _encoder = new(info.Channels, info.SampleRate, bitRate * 1000, bitRate * 1000, bitRate * 1000); } else { _encoder = new(info.Channels, info.SampleRate, -1, bitRate * 1000, -1); } } else { _encoder = new(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; 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; }
public unsafe void WriteMetadata(Stream stream, AudioMetadata metadata, SettingDictionary settings) { using (var tempStream = new TempFileStream()) { OggStream inputOggStream = null; OggStream outputOggStream = null; #if NETSTANDARD2_0 var buffer = ArrayPool <byte> .Shared.Rent(4096); #else Span <byte> buffer = stackalloc byte[4096]; #endif try { using (var sync = new OggSync()) { var headerWritten = false; OggPage page; var pagesWritten = 0u; do { // Read from the buffer into a page while (!sync.PageOut(out page)) { #if NETSTANDARD2_0 var bytesRead = stream.Read(buffer, 0, buffer.Length); #else var bytesRead = stream.Read(buffer); #endif if (bytesRead == 0) { throw new AudioInvalidException("No Ogg stream was found."); } var nativeBuffer = new Span <byte>(sync.Buffer(bytesRead).ToPointer(), bytesRead); #if NETSTANDARD2_0 buffer.AsSpan().Slice(0, bytesRead).CopyTo(nativeBuffer); #else buffer.Slice(0, bytesRead).CopyTo(nativeBuffer); #endif sync.Wrote(bytesRead); } if (inputOggStream == null) { inputOggStream = new OggStream(SafeNativeMethods.OggPageSerialNo(page)); } if (outputOggStream == null) { outputOggStream = new OggStream(inputOggStream.SerialNumber); } // Write new header page(s) using a modified comment packet if (!headerWritten) { inputOggStream.PageIn(page); while (inputOggStream.PacketOut(out var packet)) { switch (packet.PacketNumber) { case 0: outputOggStream.PacketIn(packet); break; // Substitute the new comment packet case 1: using (var adapter = new MetadataToVorbisCommentAdapter(metadata)) { adapter.HeaderOut(out var commentPacket); outputOggStream.PacketIn(commentPacket); } break; // Flush at the end of the header case 2: outputOggStream.PacketIn(packet); while (outputOggStream.Flush(out var outPage)) { WritePage(outPage, tempStream); pagesWritten++; } headerWritten = true; break; default: throw new AudioInvalidException("Missing header packet."); } } } else { // Copy the existing data pages verbatim, with updated sequence numbers UpdateSequenceNumber(ref page, pagesWritten); WritePage(page, tempStream); pagesWritten++; } } while (!SafeNativeMethods.OggPageEos(page)); // Once the end of the input is reached, overwrite the original file and return stream.Position = 0; stream.SetLength(tempStream.Length); tempStream.Position = 0; tempStream.CopyTo(stream); } } finally { #if NETSTANDARD2_0 ArrayPool <byte> .Shared.Return(buffer); #endif inputOggStream?.Dispose(); outputOggStream?.Dispose(); } } }