/* GStreamer
* Copyright (C) <2003> David A. Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsterror
* @title: GstError
* @short_description: Categorized error messages
* @see_also: #GstMessage
*
* GStreamer elements can throw non-fatal warnings and fatal errors.
* Higher-level elements and applications can programmatically filter
* the ones they are interested in or can recover from,
* and have a default handler handle the rest of them.
*
* The rest of this section will use the term <quote>error</quote>
* to mean both (non-fatal) warnings and (fatal) errors; they are treated
* similarly.
*
* Errors from elements are the combination of a #GError and a debug string.
* The #GError contains:
* - a domain type: CORE, LIBRARY, RESOURCE or STREAM
* - a code: an enum value specific to the domain
* - a translated, human-readable message
* - a non-translated additional debug string, which also contains
* - file and line information
*
* 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 #GstBus of the element/pipeline for #GstMessage 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 #GstMessage.
*
* 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.
*
* Elements throw errors using the #GST_ELEMENT_ERROR convenience macro:
*
* ## Throwing an error
*
* |[
* GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
* (_("No file name specified for reading.")), (NULL));
* ]|
*
* Things to keep in mind:
*
* * Don't go off inventing new error codes. The ones
* currently provided should be enough. If you find your type of error
* does not fit the current codes, you should use FAILED.
* * Don't provide a message if the default one suffices.
* this keeps messages more uniform. Use (%NULL) - not forgetting the
* parentheses.
* * If you do supply a custom message, it should be
* marked for translation. The message should start with a capital
* and end with a period. The message should describe the error in short,
* in a human-readable form, and without any complex technical terms.
* A user interface will present this message as the first thing a user
* sees. Details, technical info, ... should go in the debug string.
*
* * The debug string can be as you like. Again, use (%NULL)
* if there's nothing to add - file and line number will still be
* passed. #GST_ERROR_SYSTEM can be used as a shortcut to give
* debug information on a system call error.
*
*/
/* FIXME 2.0: the entire error system needs an overhaul - it's not very
* useful the way it is. Also, we need to be able to specify additional
* 'details' for errors (e.g. disk/file/resource error -> out-of-space; or
* put the url/filename/device name that caused the error somewhere)
* without having to add enums for every little thing.
*
* FIXME 2.0: get rid of GST_{CORE,LIBRARY,RESOURCE,STREAM}_ERROR_NUM_ERRORS.
* Maybe also replace _quark() functions with g_quark_from_static_string()?
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst_private.h"
#include <gst/gst.h>
#include "gst-i18n-lib.h"
#define QUARK_FUNC(string) \
GQuark gst_ ## string ## _error_quark (void) { \
static GQuark quark; \
if (!quark) \
quark = g_quark_from_static_string ("gst-" # string "-error-quark"); \
return quark; }
#define FILE_A_BUG " Please file a bug at " PACKAGE_BUGREPORT "."
static const gchar *
gst_error_get_core_error (GstCoreError code)
{
switch (code) {
case GST_CORE_ERROR_FAILED:
return _("GStreamer encountered a general core library error.");
case GST_CORE_ERROR_TOO_LAZY:
return _("GStreamer developers were too lazy to assign an error code "
"to this error." FILE_A_BUG);
case GST_CORE_ERROR_NOT_IMPLEMENTED:
return _("Internal GStreamer error: code not implemented." FILE_A_BUG);
case GST_CORE_ERROR_STATE_CHANGE:
return _("GStreamer error: state change failed and some element failed "
"to post a proper error message with the reason for the failure.");
case GST_CORE_ERROR_PAD:
return _("Internal GStreamer error: pad problem." FILE_A_BUG);
case GST_CORE_ERROR_THREAD:
return _("Internal GStreamer error: thread problem." FILE_A_BUG);
case GST_CORE_ERROR_NEGOTIATION:
return _("GStreamer error: negotiation problem.");
case GST_CORE_ERROR_EVENT:
return _("Internal GStreamer error: event problem." FILE_A_BUG);
case GST_CORE_ERROR_SEEK:
return _("Internal GStreamer error: seek problem." FILE_A_BUG);
case GST_CORE_ERROR_CAPS:
return _("Internal GStreamer error: caps problem." FILE_A_BUG);
case GST_CORE_ERROR_TAG:
return _("Internal GStreamer error: tag problem." FILE_A_BUG);
case GST_CORE_ERROR_MISSING_PLUGIN:
return _("Your GStreamer installation is missing a plug-in.");
case GST_CORE_ERROR_CLOCK:
return _("GStreamer error: clock problem.");
case GST_CORE_ERROR_DISABLED:
return _("This application is trying to use GStreamer functionality "
"that has been disabled.");
case GST_CORE_ERROR_NUM_ERRORS:
default:
break;
}
return NULL;
}
static const gchar *
gst_error_get_library_error (GstLibraryError code)
{
switch (code) {
case GST_LIBRARY_ERROR_FAILED:
return _("GStreamer encountered a general supporting library error.");
case GST_LIBRARY_ERROR_TOO_LAZY:
return _("GStreamer developers were too lazy to assign an error code "
"to this error." FILE_A_BUG);
case GST_LIBRARY_ERROR_INIT:
return _("Could not initialize supporting library.");
case GST_LIBRARY_ERROR_SHUTDOWN:
return _("Could not close supporting library.");
case GST_LIBRARY_ERROR_SETTINGS:
return _("Could not configure supporting library.");
case GST_LIBRARY_ERROR_ENCODE:
return _("Encoding error.");
case GST_LIBRARY_ERROR_NUM_ERRORS:
default:
break;
}
return NULL;
}
static const gchar *
gst_error_get_resource_error (GstResourceError code)
{
switch (code) {
case GST_RESOURCE_ERROR_FAILED:
return _("GStreamer encountered a general resource error.");
case GST_RESOURCE_ERROR_TOO_LAZY:
return _("GStreamer developers were too lazy to assign an error code "
"to this error." FILE_A_BUG);
case GST_RESOURCE_ERROR_NOT_FOUND:
return _("Resource not found.");
case GST_RESOURCE_ERROR_BUSY:
return _("Resource busy or not available.");
case GST_RESOURCE_ERROR_OPEN_READ:
return _("Could not open resource for reading.");
case GST_RESOURCE_ERROR_OPEN_WRITE:
return _("Could not open resource for writing.");
case GST_RESOURCE_ERROR_OPEN_READ_WRITE:
return _("Could not open resource for reading and writing.");
case GST_RESOURCE_ERROR_CLOSE:
return _("Could not close resource.");
case GST_RESOURCE_ERROR_READ:
return _("Could not read from resource.");
case GST_RESOURCE_ERROR_WRITE:
return _("Could not write to resource.");
case GST_RESOURCE_ERROR_SEEK:
return _("Could not perform seek on resource.");
case GST_RESOURCE_ERROR_SYNC:
return _("Could not synchronize on resource.");
case GST_RESOURCE_ERROR_SETTINGS:
return _("Could not get/set settings from/on resource.");
case GST_RESOURCE_ERROR_NO_SPACE_LEFT:
return _("No space left on the resource.");
case GST_RESOURCE_ERROR_NOT_AUTHORIZED:
return _("Not authorized to access resource.");
case GST_RESOURCE_ERROR_NUM_ERRORS:
default:
break;
}
return NULL;
}
static const gchar *
gst_error_get_stream_error (GstStreamError code)
{
switch (code) {
case GST_STREAM_ERROR_FAILED:
return _("GStreamer encountered a general stream error.");
case GST_STREAM_ERROR_TOO_LAZY:
return _("GStreamer developers were too lazy to assign an error code "
"to this error." FILE_A_BUG);
case GST_STREAM_ERROR_NOT_IMPLEMENTED:
return _("Element doesn't implement handling of this stream. "
"Please file a bug.");
case GST_STREAM_ERROR_TYPE_NOT_FOUND:
return _("Could not determine type of stream.");
case GST_STREAM_ERROR_WRONG_TYPE:
return _("The stream is of a different type than handled by this "
"element.");
case GST_STREAM_ERROR_CODEC_NOT_FOUND:
return _("There is no codec present that can handle the stream's type.");
case GST_STREAM_ERROR_DECODE:
return _("Could not decode stream.");
case GST_STREAM_ERROR_ENCODE:
return _("Could not encode stream.");
case GST_STREAM_ERROR_DEMUX:
return _("Could not demultiplex stream.");
case GST_STREAM_ERROR_MUX:
return _("Could not multiplex stream.");
case GST_STREAM_ERROR_FORMAT:
return _("The stream is in the wrong format.");
case GST_STREAM_ERROR_DECRYPT:
return _("The stream is encrypted and decryption is not supported.");
case GST_STREAM_ERROR_DECRYPT_NOKEY:
return _("The stream is encrypted and can't be decrypted because no "
"suitable key has been supplied.");
case GST_STREAM_ERROR_NUM_ERRORS:
default:
break;
}
return NULL;
}
QUARK_FUNC (core);
QUARK_FUNC (library);
QUARK_FUNC (resource);
QUARK_FUNC (stream);
/**
* gst_error_get_message:
* @domain: the GStreamer error domain this error belongs to.
* @code: the error code belonging to the domain.
*
* Get a string describing the error message in the current locale.
*
* Returns: (transfer full): a newly allocated string describing
* the error message (in UTF-8 encoding)
*/
gchar *
gst_error_get_message (GQuark domain, gint code)
{
const gchar *message = NULL;
if (domain == GST_CORE_ERROR)
message = gst_error_get_core_error ((GstCoreError) code);
else if (domain == GST_LIBRARY_ERROR)
message = gst_error_get_library_error ((GstLibraryError) code);
else if (domain == GST_RESOURCE_ERROR)
message = gst_error_get_resource_error ((GstResourceError) code);
else if (domain == GST_STREAM_ERROR)
message = gst_error_get_stream_error ((GstStreamError) code);
else {
g_warning ("No error messages for domain %s", g_quark_to_string (domain));
return g_strdup_printf (_("No error message for domain %s."),
g_quark_to_string (domain));
}
if (message)
return g_strdup (message);
else
return
g_strdup_printf (_
("No standard error message for domain %s and code %d."),
g_quark_to_string (domain), code);
}