Gst::LibraryError Class Reference

The GStreamer library GError type. More...

#include <gstreamermm/error.h>

Inherits Error.

Public Types
enum	Code {   FAILED = 1,   TOO_LAZY,   INIT,   SHUTDOWN,   SETTINGS,   ENCODE,   NUM_ERRORS }
	Library errors are for errors from the library being used by elements (initializing, finalizing, settings, ...) More...

Public Member Functions
	LibraryError (Code error_code, const Glib::ustring& error_message)
	LibraryError (GError* gobject)
Code	code () const

Detailed Description

The GStreamer library GError type.

GStreamer elements can throw non-fatal warnings and fatal errors. Higher-level elements and applications can programatically filter the ones they are interested in or can recover from, and have a default handler handle the rest of them. Both warnings and fatal errors are treated similarly.

Library errors are for errors from the library being used by elements (initializing, finalizing, settings, ...)

• FAILED - a general error which doesn't fit in any other category. Make sure you add a custom message to the error call.
• TOO_LAZY - do not use this except as a placeholder for deciding where to go while developing code.
• INIT - used when the library could not be opened.
• SHUTDOWN - used when the library could not be closed.
• SETTINGS - used when the library doesn't accept settings.
• ENCODE - used when the library generated an encoding error.
• NUM_ERRORS - the number of library error types.

Elements do not have the context required to decide what to do with errors. As such, they should only inform about errors, and stop their processing. In short, an element doesn't know what it is being used for.

It is the application or compound element using the given element that has more context about the use of the element. Errors can be received by listening to the Gst::Bus of the element/pipeline for Gst::Message objects with the type Gst::MESSAGE_ERROR or Gst::MESSAGE_WARNING. The thrown errors should be inspected, and filtered if appropriate.

An application is expected to, by default, present the user with a dialog box (or an equivalent) showing the error message. The dialog should also allow a way to get at the additional debug information, so the user can provide bug reporting information.

A compound element is expected to forward errors by default higher up the hierarchy; this is done by default in the same way as for other types of Gst::Message.

When applications or compound elements trigger errors that they can recover from, they can filter out these errors and take appropriate action. For example, an application that gets an error from xvimagesink that indicates all XVideo ports are taken, the application can attempt to use another sink instead.

Member Enumeration Documentation

Code

enum Gst::LibraryError::Code

Library errors are for errors from the library being used by elements (initializing, finalizing, settings, ...)

Enumerator
FAILED	A general error which doesn't fit in any other category. Make sure you add a custom message to the error call.
TOO_LAZY	Do not use this except as a placeholder for deciding where to go while developing code.
INIT	Used when the library could not be opened.
SHUTDOWN	Used when the library could not be closed.
SETTINGS	Used when the library doesn't accept settings.
ENCODE	Used when the library generated an encoding error.
NUM_ERRORS	The number of library error types.

Constructor & Destructor Documentation

LibraryError() [1/2]

Gst::LibraryError::LibraryError	(	Code	error_code,
		const Glib::ustring &	error_message
	)

LibraryError() [2/2]

Gst::LibraryError::LibraryError ( GError *  gobject )

explicit

Member Function Documentation

code()

Code Gst::LibraryError::code

(

)

const