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