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);
}
}
internal void HeaderOut(ref VorbisComment comment, out OggPacket first, out OggPacket second, out OggPacket third)
{
Result result = SafeNativeMethods.VorbisAnalysisHeaderOut(_dspState, ref comment,
out first, out second, out third);
if (result != Result.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.NativeVorbisEncoderHeaderOutError, result));
}
}
internal void HeaderIn(ref VorbisComment comment, ref OggPacket packet)
{
Result result = SafeNativeMethods.VorbisSynthesisHeaderIn(_info, ref comment, ref packet);
switch (result)
{
case Result.Ok:
return;
case Result.NotVorbisError:
throw new UnsupportedAudioException(Resources.NativeVorbisDecoderNotVorbisError);
default:
throw new IOException(string.Format(CultureInfo.CurrentCulture, Resources.NativeVorbisDecoderHeaderInError, result));
}
}
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);
}
}
internal VorbisCommentToMetadataAdapter(VorbisComment vorbisComment)
{
var commentLengths = new int[vorbisComment.Comments];
Marshal.Copy(vorbisComment.CommentLengths, commentLengths, 0, commentLengths.Length);
var commentPtrs = new IntPtr[vorbisComment.Comments];
Marshal.Copy(vorbisComment.UserComments, commentPtrs, 0, commentPtrs.Length);
for (var i = 0; i < vorbisComment.Comments; i++)
{
var commentBytes = new byte[commentLengths[i]];
Marshal.Copy(commentPtrs[i], commentBytes, 0, commentLengths[i]);
string[] comment = Encoding.UTF8.GetString(commentBytes).Split(new[] { '=' }, 2);
Contract.Assert(comment.Length == 2);
// The track number and count may be packed into the same comment:
switch (comment[0])
{
case "TRACKNUMBER":
string[] segments = comment[1].Split('/');
base["TrackNumber"] = segments[0];
if (segments.Length > 1)
{
base["TrackCount"] = segments[1];
}
break;
case "DATE":
case "YEAR":
// The DATE comment may contain a full date, or only the year:
DateTime result;
if (DateTime.TryParse(comment[1], CultureInfo.CurrentCulture,
DateTimeStyles.NoCurrentDateDefault, out result) && result.Year >= 1000)
{
base["Day"] = result.Day.ToString(CultureInfo.InvariantCulture);
base["Month"] = result.Month.ToString(CultureInfo.InvariantCulture);
base["Year"] = result.Year.ToString(CultureInfo.InvariantCulture);
}
else
{
base["Year"] = comment[1];
}
break;
case "METADATA_BLOCK_PICTURE":
var picture = new MetadataBlockPicture(comment[1]);
if (picture.Type == PictureType.CoverFront || picture.Type == PictureType.Other)
{
try
{
CoverArt = new CoverArt(picture.Data);
}
catch (UnsupportedCoverArtException)
{ }
}
break;
case "COVERART":
try
{
// Deprecated way to store cover art:
CoverArt = new CoverArt(Convert.FromBase64String(comment[1]));
}
catch (UnsupportedCoverArtException)
{ }
break;
default:
string mappedKey;
if (_map.TryGetValue(comment[0], out mappedKey))
{
base[mappedKey] = comment[1];
}
break;
}
}
}
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);
}
}
}
internal static extern void VorbisCommentInitialize(out VorbisComment comment);
internal static extern Result VorbisAnalysisHeaderOut(IntPtr dspState, ref VorbisComment comment, out OggPacket first, out OggPacket second, out OggPacket third);
internal static extern Result VorbisSynthesisHeaderIn(IntPtr info, ref VorbisComment comment, ref OggPacket packet);
internal static extern void VorbisCommentClear(ref VorbisComment comment);
internal static extern int VorbisCommentHeaderOut(ref VorbisComment comment, out OggPacket packet);
internal static extern void VorbisCommentAddTag(ref VorbisComment comment, byte[] tag, byte[] contents);
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);
}
}
}
