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 void WriteMetadata(Stream stream, MetadataDictionary metadata, SettingsDictionary settings)
{
// This buffer is used for both reading and writing:
var buffer = new byte[4096];
using (var tempStream = new MemoryStream())
{
NativeOggStream inputOggStream = null;
NativeOggStream outputOggStream = null;
try
{
using (var sync = new NativeOggSync())
{
OggPage inPage;
do
{
// Read from the buffer into a page:
while (sync.PageOut(out inPage) != 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);
}
// Initialize the input and output streams, if necessary:
if (inputOggStream == null)
{
inputOggStream = new NativeOggStream(SafeNativeMethods.OggPageGetSerialNumber(ref inPage));
}
if (outputOggStream == null)
{
outputOggStream = new NativeOggStream(inputOggStream.SerialNumber);
}
inputOggStream.PageIn(ref inPage);
OggPacket packet;
while (inputOggStream.PacketOut(out packet) == 1)
{
// Substitute the new comment packet:
if (packet.PacketNumber == 1)
{
OggPacket commentPacket = GetCommentPacket(metadata);
outputOggStream.PacketIn(ref commentPacket);
}
else
{
outputOggStream.PacketIn(ref packet);
}
// Page out each packet, flushing at the end of the header:
OggPage outPage;
if (packet.PacketNumber == 2)
{
while (outputOggStream.Flush(out outPage))
{
WritePage(outPage, tempStream, buffer);
}
}
else
{
while (outputOggStream.PageOut(out outPage))
{
WritePage(outPage, tempStream, buffer);
}
}
}
} while (SafeNativeMethods.OggPageEndOfStream(ref inPage) == 0);
// If the end of the stream is reached, overwrite the original file and return:
Overwrite(stream, tempStream);
}
}
finally
{
inputOggStream?.Dispose();
outputOggStream?.Dispose();
}
}
}
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);
}
}
}