major move of all glib specific bindings and extendable objects from go runtime to go-glib package

gst/gst_errors.go

@@ -97,3 +97,37 @@ const (
 	StreamErrorDecrypt        ErrorCode = C.GST_STREAM_ERROR_DECRYPT         // (12) – used when the stream is encrypted and can't be decrypted because this is not supported by the element.
 	StreamErrorDecryptNoKey   ErrorCode = C.GST_STREAM_ERROR_DECRYPT_NOKEY   // (13) – used when the stream is encrypted and can't be decrypted because no suitable key is available.
 )
+
+// GError is a Go wrapper for a C GError in the context of GStreamer. It implements the error interface
+// and provides additional functions for retrieving debug strings and details.
+type GError struct {
+	errMsg, debugStr string
+	structure        *Structure
+
+	// used for message constructors
+	code ErrorCode
+}
+
+// Message is an alias to `Error()`. It's for clarity when this object
+// is parsed from a `GST_MESSAGE_INFO` or `GST_MESSAGE_WARNING`.
+func (e *GError) Message() string { return e.Error() }
+
+// Error implements the error interface and returns the error message.
+func (e *GError) Error() string { return e.errMsg }
+
+// DebugString returns any debug info alongside the error.
+func (e *GError) DebugString() string { return e.debugStr }
+
+// Structure returns the structure of the error message which may contain additional metadata.
+func (e *GError) Structure() *Structure { return e.structure }
+
+// Code returns the error code of the error message.
+func (e *GError) Code() ErrorCode { return e.code }
+
+// NewGError wraps the given error inside a GError (to be used with message constructors).
+func NewGError(code ErrorCode, err error) *GError {
+	return &GError{
+		errMsg: err.Error(),
+		code:   code,
+	}
+}