/// <summary>
/// Determines the correct codec to use for a stream header
/// packet.
/// </summary>
/// <param name="packet">
/// A <see cref="ByteVector" /> object containing the first
/// packet of an Ogg logical bitstream.
/// </param>
/// <returns>
/// A <see cref="Codec" /> object capable of handling
/// <paramref name="packet" /> and subsequent packets from
/// the same stream.
/// </returns>
/// <exception cref="UnsupportedFormatException">
/// No registered codec capable of processing
/// <paramref
/// name="packet" />
/// could be found.
/// </exception>
/// <remarks>
/// This method will first use <see cref="CodecProvider" />
/// delegates registered with <see cref="AddCodecProvider" />
/// and then attempt to use the built-in codecs.
/// </remarks>
public static Codec GetCodec(ByteVector packet)
{
Codec c = null;
foreach (var p in providers)
{
c = p(packet);
if (c != null)
{
return(c);
}
}
c = Vorbis.FromPacket(packet);
if (c != null)
{
return(c);
}
c = Theora.FromPacket(packet);
if (c != null)
{
return(c);
}
c = Opus.FromPacket(packet);
if (c != null)
{
return(c);
}
throw new UnsupportedFormatException("Unknown codec.");
}
public override void ExtractAsWav(IApplicationLogger logger, MaterialSection.MaterialEntry entry, byte[] fullFileBytes, string wavPath)
{
var rawContentBytes = fullFileBytes.SubArray(entry.InnerStreamStartPosition, entry.InnerStreamSize);
var vorbis = Vorbis.FromMemory(rawContentBytes);
WavWriterLoopPoint[] loopPoints = null;
if (entry.IsLooping)
{
loopPoints = new[] { new WavWriterLoopPoint {
StartSample = entry.LoopStart, EndSample = entry.LoopEnd
} }
}
;
var wavWriter = new CustomWavWriter();
wavWriter.WriteWav(new CustomWavWriterRequest()
{
WavPath = wavPath,
Channels = vorbis.Channels,
SampleRate = vorbis.SampleRate,
WavSampleWriter = new OggVorbisToWavSampleWriter(vorbis),
LoopPoints = loopPoints,
});
logger.Log($"Created wav audio track at: {wavPath}");
}
private void LoadSong()
{
var path = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
path = Path.Combine(path, "music.ogg");
var buffer = File.ReadAllBytes(path);
_vorbis = Vorbis.FromMemory(buffer);
_effect = new DynamicSoundEffectInstance(_vorbis.SampleRate, (AudioChannels)_vorbis.Channels)
{
Volume = 0.5f
};
_effect.BufferNeeded += (s, a) => SubmitBuffer();
SubmitBuffer();
}
public OggVorbisToWavSampleWriter(Vorbis vorbis)
{
_vorbis = vorbis;
}
