mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 16:26:39 +00:00
5608ed3da1
Original commit message from CVS: added all of my un-committed random doc files, as backup <g>
61 lines
2 KiB
Text
61 lines
2 KiB
Text
GStreamer polices for various forms of library output, including error cases.
|
|
|
|
|
|
g_return_...
|
|
============
|
|
The parameters of a function are checked for validity (non-NULL, correct type, etc.) with g_return[_val]_if_fail, i.e.:
|
|
|
|
gst_element_connect (GstElement *src, gchar *srcpadname,
|
|
GstElement *dest, gchar *destpadname) {
|
|
g_return_if_fail (src != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT(src));
|
|
g_return_if_fail (srcpadname != NULL);
|
|
g_return_if_fail (dest != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT(dest));
|
|
g_return_if_fail (destpadname != NULL);
|
|
|
|
This will inform the user of the library of any basic problems with the arguments they pass, such as a NULL pointer.
|
|
|
|
|
|
ERROR
|
|
=====
|
|
The ERROR macro will be used whenever there is some other type of flaw in the data passed, at a GStreamer-specific
|
|
level:
|
|
|
|
srcpad = gst_element_get_pad (src, srcpadname);
|
|
if (srcpad == NULL) {
|
|
ERROR(src,"source element has no pad \"%s\"",srcpadname);
|
|
return;
|
|
}
|
|
|
|
An ERROR will generally cause ceasation of the application, and ideally launch gdb.
|
|
|
|
|
|
INFO
|
|
====
|
|
The INFO macro will be used to output any interesting state from the library, such as plugin loading and various events
|
|
of interest. They will be separated into categories that can be individually enabled and disabled.
|
|
|
|
Categories (first draft of list, unordered):
|
|
|
|
cothreads [cothreads.c]
|
|
gst initialization [gst.c]
|
|
autoplug results [autoplug.c]
|
|
autoplug attempts [autoplug.c]
|
|
bin parentage issues [gstbin.c]
|
|
plan generation [gstbin.c]
|
|
schedule generation [gstschedule.c]
|
|
schedule implementation [gstpad.c, gstbin.c, etc.]
|
|
buffer operations [gstbuffer.h]
|
|
caps matching [gstcaps.c]
|
|
clock stuff [gstclock.c]
|
|
element pad operations [gstelement.c]
|
|
elementfactory operations [gstelementfactory.c]
|
|
pad creation/connection [gstpad.c]
|
|
pipeline stuff [gstpipeline.c]
|
|
plugin loading [gstplugin.c]
|
|
plugin loading errors [gstplugin.c]
|
|
properties operations [gstprops.c]
|
|
thread creation/management [gstthread.c]
|
|
type operations [gsttype.c]
|
|
XML load/save [gstxml.c]
|