/// <summary>Initializes the FLAC stream decoder</summary>
/// <param name="stream">Stream that will be decoded</param>
public void InitStream(FlacStream stream)
{
// Explanation for the GCHandle stuff: The only reference to the FlacStream instance
// will very likely remain in unmanaged code. Since the garbage collector cannot
// see this reference, given no other references to it exist, the FlacStream instance
// would then become a candidate for garbage collection. The GCHandle avoids this.
// It will ensure the FlacStream instance is kept alive until it the FLAC stream decoder
// is destroyed (at which point we are responsible for invoking its Free() method)
GCHandle streamHandle = GCHandle.Alloc(stream, GCHandleType.Normal);
try {
int result = UnsafeNativeMethods.FLAC__stream_decoder_init_stream(
this.decoderHandle,
stream.ReadCallbackDelegate,
stream.SeekCallbackDelegate,
stream.TellCallbackDelegate,
stream.LengthCallbackDelegate,
stream.EofCallbackDelegate,
stream.WriteCallbackDelegate,
stream.MetadataCallbackDelegate,
stream.ErrorCallbackDelegate,
GCHandle.ToIntPtr(streamHandle)
);
int goodResult = (int)UnsafeNativeMethods.FLAC__StreamDecoderInitStatus.
FLAC__STREAM_DECODER_INIT_STATUS_OK;
if (result != goodResult)
{
// TODO: Transform the error code into an appropriate exception
throw new Exception("FLAC__stream_decoder_init_stream() has failed");
}
}
catch (Exception) {
streamHandle.Free();
throw;
}
}
/// <summary>Initializes the FLAC stream decoder</summary>
/// <param name="stream">Stream that will be decoded</param>
public void InitStream(FlacStream stream) {
// Explanation for the GCHandle stuff: The only reference to the FlacStream instance
// will very likely remain in unmanaged code. Since the garbage collector cannot
// see this reference, given no other references to it exist, the FlacStream instance
// would then become a candidate for garbage collection. The GCHandle avoids this.
// It will ensure the FlacStream instance is kept alive until it the FLAC stream decoder
// is destroyed (at which point we are responsible for invoking its Free() method)
GCHandle streamHandle = GCHandle.Alloc(stream, GCHandleType.Normal);
try {
int result = UnsafeNativeMethods.FLAC__stream_decoder_init_stream(
this.decoderHandle,
stream.ReadCallbackDelegate,
stream.SeekCallbackDelegate,
stream.TellCallbackDelegate,
stream.LengthCallbackDelegate,
stream.EofCallbackDelegate,
stream.WriteCallbackDelegate,
stream.MetadataCallbackDelegate,
stream.ErrorCallbackDelegate,
GCHandle.ToIntPtr(streamHandle)
);
int goodResult = (int)UnsafeNativeMethods.FLAC__StreamDecoderInitStatus.
FLAC__STREAM_DECODER_INIT_STATUS_OK;
if(result != goodResult) {
// TODO: Transform the error code into an appropriate exception
throw new Exception("FLAC__stream_decoder_init_stream() has failed");
}
}
catch(Exception) {
streamHandle.Free();
throw;
}
}
