static OggPacket GetCommentPacket(MetadataDictionary metadata)
{
Contract.Requires(metadata != null);
var comment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out comment);
foreach (var item in new MetadataToVorbisCommentAdapter(metadata))
{
// The key and value need to be marshaled as null-terminated UTF-8 strings:
var keyBytes = new byte[Encoding.UTF8.GetByteCount(item.Key) + 1];
Encoding.UTF8.GetBytes(item.Key, 0, item.Key.Length, keyBytes, 0);
var valueBytes = new byte[Encoding.UTF8.GetByteCount(item.Value) + 1];
Encoding.UTF8.GetBytes(item.Value, 0, item.Value.Length, valueBytes, 0);
SafeNativeMethods.VorbisCommentAddTag(ref comment, keyBytes, valueBytes);
}
OggPacket result;
if (SafeNativeMethods.VorbisCommentHeaderOut(ref comment, out result) != 0)
{
throw new IOException(Resources.MetadataEncoderHeaderOutError);
}
return(result);
}
finally
{
SafeNativeMethods.VorbisCommentClear(ref comment);
}
}
void WriteHeader(MetadataDictionary metadata, Stream stream)
{
Contract.Requires(metadata != null);
Contract.Requires(stream != null);
Contract.Requires(stream.CanWrite);
var vorbisComment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out vorbisComment);
foreach (var item in new MetadataToVorbisCommentAdapter(metadata))
{
// The key and value need to be marshaled as null-terminated UTF-8 strings:
var keyBytes = new byte[Encoding.UTF8.GetByteCount(item.Key) + 1];
Encoding.UTF8.GetBytes(item.Key, 0, item.Key.Length, keyBytes, 0);
var valueBytes = new byte[Encoding.UTF8.GetByteCount(item.Value) + 1];
Encoding.UTF8.GetBytes(item.Value, 0, item.Value.Length, valueBytes, 0);
SafeNativeMethods.VorbisCommentAddTag(ref vorbisComment, keyBytes, valueBytes);
}
OggPacket first;
OggPacket second;
OggPacket third;
_encoder.HeaderOut(ref vorbisComment, out first, out second, out third);
_oggStream.PacketIn(ref first);
_oggStream.PacketIn(ref second);
_oggStream.PacketIn(ref third);
}
finally
{
SafeNativeMethods.VorbisCommentClear(ref vorbisComment);
}
OggPage page;
while (_oggStream.Flush(out page))
{
WritePage(page, stream);
}
}
public AudioInfo ReadAudioInfo(Stream stream)
{
Contract.Ensures(Contract.Result <AudioInfo>() != null);
var buffer = new byte[4096];
using (var decoder = new NativeVorbisDecoder())
{
NativeOggStream oggStream = null;
var vorbisComment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out vorbisComment);
using (var sync = new NativeOggSync())
{
OggPage page;
do
{
// Read from the buffer into a page:
while (sync.PageOut(out page) != 1)
{
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
{
throw new IOException(Resources.ReadError);
}
IntPtr nativeBuffer = sync.Buffer(bytesRead);
Marshal.Copy(buffer, 0, nativeBuffer, bytesRead);
sync.Wrote(bytesRead);
}
if (oggStream == null)
{
oggStream = new NativeOggStream(SafeNativeMethods.OggPageGetSerialNumber(ref page));
}
oggStream.PageIn(ref page);
OggPacket packet;
while (oggStream.PacketOut(out packet) == 1)
{
decoder.HeaderIn(ref vorbisComment, ref packet);
VorbisInfo info = decoder.GetInfo();
return(new AudioInfo(string.Format(CultureInfo.CurrentCulture,
"{0}kbps Ogg Vorbis", info.BitrateNominal / 1000), info.Channels, 0, info.Rate, 0));
}
} while (SafeNativeMethods.OggPageEndOfStream(ref page) == 0);
throw new IOException(Resources.EndOfStreamError);
}
}
finally
{
oggStream?.Dispose();
SafeNativeMethods.VorbisCommentClear(ref vorbisComment);
}
}
}
public MetadataDictionary ReadMetadata(Stream stream)
{
Contract.Ensures(Contract.Result <MetadataDictionary>() != null);
var buffer = new byte[4096];
using (var decoder = new NativeVorbisDecoder())
{
NativeOggStream oggStream = null;
var vorbisComment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out vorbisComment);
using (var sync = new NativeOggSync())
{
OggPage page;
do
{
// Read from the buffer into a page:
while (sync.PageOut(out page) != 1)
{
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
{
throw new IOException(Resources.ReadError);
}
IntPtr nativeBuffer = sync.Buffer(bytesRead);
Marshal.Copy(buffer, 0, nativeBuffer, bytesRead);
sync.Wrote(bytesRead);
}
if (oggStream == null)
{
oggStream = new NativeOggStream(SafeNativeMethods.OggPageGetSerialNumber(ref page));
}
oggStream.PageIn(ref page);
OggPacket packet;
while (oggStream.PacketOut(out packet) == 1)
{
decoder.HeaderIn(ref vorbisComment, ref packet);
if (packet.PacketNumber == 1)
{
return(new VorbisCommentToMetadataAdapter(vorbisComment));
}
}
} while (SafeNativeMethods.OggPageEndOfStream(ref page) == 0);
throw new IOException(Resources.EndOfStreamError);
}
}
finally
{
oggStream?.Dispose();
SafeNativeMethods.VorbisCommentClear(ref vorbisComment);
}
}
}
