internal Encoder(
Stream stream,
int sampleRate,
int channels,
int totalSeconds,
OpusCommentsHandle comments)
{
_realStream = stream;
_outputStream = new MemoryStream();
_channels = channels;
_totalSeconds = totalSeconds;
_callbacks = InitializeCallbacks();
_handle = SafeNativeMethods.OpusEncoderCreateCallbacks(
ref _callbacks,
IntPtr.Zero,
comments,
sampleRate,
channels,
0,
out var error);
if (error != 0)
{
throw new AudioEncodingException($"Opus encountered error '{error}' during initialization.");
}
}
internal unsafe MetadataToOpusCommentAdapter([NotNull] AudioMetadata metadata)
{
Handle = SafeNativeMethods.OpusEncoderCommentsCreate();
if (!string.IsNullOrEmpty(metadata.Title))
{
AddTag("TITLE", metadata.Title);
}
if (!string.IsNullOrEmpty(metadata.Artist))
{
AddTag("ARTIST", metadata.Artist);
}
if (!string.IsNullOrEmpty(metadata.Album))
{
AddTag("ALBUM", metadata.Album);
}
if (!string.IsNullOrEmpty(metadata.AlbumArtist))
{
AddTag("ALBUMARTIST", metadata.AlbumArtist);
}
if (!string.IsNullOrEmpty(metadata.Composer))
{
AddTag("COMPOSER", metadata.Composer);
}
if (!string.IsNullOrEmpty(metadata.Genre))
{
AddTag("GENRE", metadata.Genre);
}
if (!string.IsNullOrEmpty(metadata.Comment))
{
AddTag("DESCRIPTION", metadata.Comment);
}
if (!string.IsNullOrEmpty(metadata.Day) &&
!string.IsNullOrEmpty(metadata.Month) &&
!string.IsNullOrEmpty(metadata.Year))
{
AddTag("DATE", $"{metadata.Year}-{metadata.Month}-{metadata.Day}");
}
else if (!string.IsNullOrEmpty(metadata.Year))
{
AddTag("YEAR", metadata.Year);
}
if (!string.IsNullOrEmpty(metadata.TrackNumber))
{
AddTag("TRACKNUMBER", !string.IsNullOrEmpty(metadata.TrackCount)
? $"{metadata.TrackNumber}/{metadata.TrackCount}"
: metadata.TrackNumber);
}
if (!string.IsNullOrEmpty(metadata.TrackGain))
{
AddTag("R128_TRACK_GAIN", ConvertGain(metadata.TrackGain));
}
if (!string.IsNullOrEmpty(metadata.AlbumGain))
{
AddTag("R128_ALBUM_GAIN", ConvertGain(metadata.AlbumGain));
}
if (metadata.CoverArt == null)
{
return;
}
// Always store images in JPEG format since Vorbis is also lossy
var coverArt = CoverArtFactory.ConvertToLossy(metadata.CoverArt);
fixed(byte *coverArtAddress = coverArt.Data)
{
var error = SafeNativeMethods.OpusEncoderCommentsAddPictureFromMemory(
Handle,
coverArtAddress,
new IntPtr(coverArt.Data.Length),
-1,
IntPtr.Zero);
if (error != 0)
{
throw new AudioEncodingException($"Opus encountered error {error} writing the cover art.");
}
}
}
