/// <summary>
/// Decodes one audio frame
/// </summary>
/// <param name="output">The MemoryStream to put the PCM encoded data</param>
/// <param name="f">Wether to add the flush flag or not</param>
/// <returns>Error number</returns>
public unsafe int Decode(MemoryStream output, bool f)
{
if (disposed)
{
throw new ObjectDisposedException("AACDecoder");
}
int res;
byte[] buffer = output.GetBuffer();
int flags = f ? 2 : 0;
fixed(byte *buf = buffer)
{
IntPtr outbuf = new IntPtr((void *)buf);
res = AACLibrary.Decode(_decoder, outbuf, flags);
}
if (res != 0)
{
throw new InvalidOperationException("Decoding frame returned error, " + res);
}
return(res);
}
/// <summary>
/// Fill the decoder with AAC encoded data
/// </summary>
/// <param name="input">The MemoryStream which the encoded bytes are in</param>
/// <returns>The amount of bytes added</returns>
public unsafe int Fill(MemoryStream input)
{
if (disposed)
{
throw new ObjectDisposedException("AACDecoder");
}
int read;
byte[] buffer = input.GetBuffer();
fixed(byte *buf = buffer)
{
IntPtr inbuf = new IntPtr((void *)buf);
read = AACLibrary.Fill(_decoder, inbuf, Convert.ToUInt32(input.Position), Convert.ToUInt32(input.Length - input.Position));
}
if (read != 0) // error happened
{
throw new InvalidOperationException("Error filling decoder, errors - " + read);
}
input.Position += read;
return(read);
}
public void Dispose()
{
if (disposed)
{
return;
}
GC.SuppressFinalize(this);
if (_decoder != IntPtr.Zero)
{
AACLibrary.Close(_decoder);
_decoder = IntPtr.Zero;
}
disposed = true;
}
/// <summary>
/// Used to configure the decoder.
/// Must be done before start of decoding
/// </summary>
/// <param name="config">Raw configuration (ASC format)</param>
public unsafe void Config(byte[] config)
{
if (config.Length > 8)
{
throw new InvalidOperationException("Error! Header is larger than 8!");
}
int error;
fixed(byte *conf = config)
{
IntPtr ptr = new IntPtr((void *)conf);
error = AACLibrary.ConfigRaw(_decoder, ptr, Convert.ToUInt32(config.Length));
}
if (error != 0)
{
throw new InvalidOperationException("Got an error configuring the decoder, " + error);
}
}
public AACDecoder()
{
_decoder = AACLibrary.Open(0, 1); // the layer will be 1 for now, maybe will need to check some stuff later.
}
