2 * Copyright (C) <2003> David A. Schleef <ds@schleef.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
22 * @short_description: Categorized error messages
23 * @see_also: #GstMessage
25 * GStreamer elements can throw non-fatal warnings and fatal errors.
26 * Higher-level elements and applications can programatically filter
27 * the ones they are interested in or can recover from,
28 * and have a default handler handle the rest of them.
30 * The rest of this section will use the term <quote>error</quote>
31 * to mean both (non-fatal) warnings and (fatal) errors; they are treated
34 * Errors from elements are the combination of a #GError and a debug string.
35 * The #GError contains:
36 * - a domain type: CORE, LIBRARY, RESOURCE or STREAM
37 * - a code: an enum value specific to the domain
38 * - a translated, human-readable message
39 * - a non-translated additional debug string, which also contains
40 * - file and line information
42 * Elements do not have the context required to decide what to do with
43 * errors. As such, they should only inform about errors, and stop their
44 * processing. In short, an element doesn't know what it is being used for.
46 * It is the application or compound element using the given element that
47 * has more context about the use of the element. The thrown errors should
48 * be inspected, and filtered if appropriate.
50 * An application is expected to, by default, present the user with a
51 * dialog box (or an equivalent) showing the error message. The dialog
52 * should also allow a way to get at the additional debug information,
53 * so the user can provide bug reporting information.
55 * A compound element is expected to forward errors by default higher up
56 * the hierarchy; this is done by default in the same way as for other types
59 * When applications or compound elements trigger errors that they can
60 * recover from, they can filter out these errors and take appropriate action.
61 * For example, an application that gets an error from xvimagesink
62 * that indicates all XVideo ports are taken, the application can attempt
63 * to use another sink instead.
65 * Elements throw errors using the #GST_ELEMENT_ERROR convenience macro:
68 * <title>Throwing an error</title>
70 * GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
71 * (_("No file name specified for reading.")), (NULL));
75 * Things to keep in mind:
77 * <listitem><para>Don't go off inventing new error codes. The ones
78 * currently provided should be enough. If you find your type of error
79 * does not fit the current codes, you should use FAILED.</para></listitem>
80 * <listitem><para>Don't provide a message if the default one suffices.
81 * this keeps messages more uniform. Use (NULL) - not forgetting the
82 * parentheses.</para></listitem>
83 * <listitem><para>If you do supply a custom message, it should be
84 * marked for translation. The message should start with a capital
85 * and end with a period. The message should describe the error in short,
86 * in a human-readable form, and without any complex technical terms.
87 * A user interface will present this message as the first thing a user
88 * sees. Details, technical info, ... should go in the debug string.
90 * <listitem><para>The debug string can be as you like. Again, use (NULL)
91 * if there's nothing to add - file and line number will still be
92 * passed. #GST_ERROR_SYSTEM can be used as a shortcut to give
93 * debug information on a system call error.</para></listitem>
101 #include "gst_private.h"
103 #include "gst-i18n-lib.h"
105 #define TABLE(t, d, a, b) t[GST_ ## d ## _ERROR_ ## a] = g_strdup (b)
106 #define QUARK_FUNC(string) \
107 GQuark gst_ ## string ## _error_quark (void) { \
108 static GQuark quark; \
110 quark = g_quark_from_static_string ("gst-" # string "-error-quark"); \
114 gst_g_error_get_type (void)
116 static GType type = 0;
118 if (G_UNLIKELY (type == 0))
119 type = g_boxed_type_register_static ("GstGError",
120 (GBoxedCopyFunc) g_error_copy, (GBoxedFreeFunc) g_error_free);
124 #define FILE_A_BUG " Please file a bug at " PACKAGE_BUGREPORT "."
126 /* initialize the dynamic table of translated core errors */
128 _gst_core_errors_init (void)
132 t = g_new0 (gchar *, GST_CORE_ERROR_NUM_ERRORS);
134 TABLE (t, CORE, FAILED,
135 N_("GStreamer encountered a general core library error."));
136 TABLE (t, CORE, TOO_LAZY,
137 N_("GStreamer developers were too lazy to assign an error code "
138 "to this error." FILE_A_BUG));
139 TABLE (t, CORE, NOT_IMPLEMENTED,
140 N_("Internal GStreamer error: code not implemented." FILE_A_BUG));
141 TABLE (t, CORE, STATE_CHANGE,
142 N_("Internal GStreamer error: state change failed." FILE_A_BUG));
143 TABLE (t, CORE, PAD, N_("Internal GStreamer error: pad problem." FILE_A_BUG));
144 TABLE (t, CORE, THREAD,
145 N_("Internal GStreamer error: thread problem." FILE_A_BUG));
146 TABLE (t, CORE, NEGOTIATION,
147 N_("Internal GStreamer error: negotiation problem." FILE_A_BUG));
148 TABLE (t, CORE, EVENT,
149 N_("Internal GStreamer error: event problem." FILE_A_BUG));
150 TABLE (t, CORE, SEEK,
151 N_("Internal GStreamer error: seek problem." FILE_A_BUG));
152 TABLE (t, CORE, CAPS,
153 N_("Internal GStreamer error: caps problem." FILE_A_BUG));
154 TABLE (t, CORE, TAG, N_("Internal GStreamer error: tag problem." FILE_A_BUG));
155 TABLE (t, CORE, MISSING_PLUGIN,
156 N_("Your GStreamer installation is missing a plug-in."));
157 TABLE (t, CORE, CLOCK,
158 N_("Internal GStreamer error: clock problem." FILE_A_BUG));
163 /* initialize the dynamic table of translated library errors */
165 _gst_library_errors_init (void)
169 t = g_new0 (gchar *, GST_LIBRARY_ERROR_NUM_ERRORS);
171 TABLE (t, LIBRARY, FAILED,
172 N_("GStreamer encountered a general supporting library error."));
173 TABLE (t, LIBRARY, TOO_LAZY,
174 N_("GStreamer developers were too lazy to assign an error code "
175 "to this error." FILE_A_BUG));
176 TABLE (t, LIBRARY, INIT, N_("Could not initialize supporting library."));
177 TABLE (t, LIBRARY, SHUTDOWN, N_("Could not close supporting library."));
178 TABLE (t, LIBRARY, SETTINGS, N_("Could not close supporting library."));
183 /* initialize the dynamic table of translated resource errors */
185 _gst_resource_errors_init (void)
189 t = g_new0 (gchar *, GST_RESOURCE_ERROR_NUM_ERRORS);
191 TABLE (t, RESOURCE, FAILED,
192 N_("GStreamer encountered a general resource error."));
193 TABLE (t, RESOURCE, TOO_LAZY,
194 N_("GStreamer developers were too lazy to assign an error code "
195 "to this error." FILE_A_BUG));
196 TABLE (t, RESOURCE, NOT_FOUND, N_("Resource not found."));
197 TABLE (t, RESOURCE, BUSY, N_("Resource busy or not available."));
198 TABLE (t, RESOURCE, OPEN_READ, N_("Could not open resource for reading."));
199 TABLE (t, RESOURCE, OPEN_WRITE, N_("Could not open resource for writing."));
200 TABLE (t, RESOURCE, OPEN_READ_WRITE,
201 N_("Could not open resource for reading and writing."));
202 TABLE (t, RESOURCE, CLOSE, N_("Could not close resource."));
203 TABLE (t, RESOURCE, READ, N_("Could not read from resource."));
204 TABLE (t, RESOURCE, WRITE, N_("Could not write to resource."));
205 TABLE (t, RESOURCE, SEEK, N_("Could not perform seek on resource."));
206 TABLE (t, RESOURCE, SYNC, N_("Could not synchronize on resource."));
207 TABLE (t, RESOURCE, SETTINGS,
208 N_("Could not get/set settings from/on resource."));
209 TABLE (t, RESOURCE, NO_SPACE_LEFT, N_("No space left on the resource."));
214 /* initialize the dynamic table of translated stream errors */
216 _gst_stream_errors_init (void)
220 t = g_new0 (gchar *, GST_STREAM_ERROR_NUM_ERRORS);
222 TABLE (t, STREAM, FAILED,
223 N_("GStreamer encountered a general stream error."));
224 TABLE (t, STREAM, TOO_LAZY,
225 N_("GStreamer developers were too lazy to assign an error code "
226 "to this error." FILE_A_BUG));
227 TABLE (t, STREAM, NOT_IMPLEMENTED,
228 N_("Element doesn't implement handling of this stream. "
229 "Please file a bug."));
230 TABLE (t, STREAM, TYPE_NOT_FOUND, N_("Could not determine type of stream."));
231 TABLE (t, STREAM, WRONG_TYPE,
232 N_("The stream is of a different type than handled by this element."));
233 TABLE (t, STREAM, CODEC_NOT_FOUND,
234 N_("There is no codec present that can handle the stream's type."));
235 TABLE (t, STREAM, DECODE, N_("Could not decode stream."));
236 TABLE (t, STREAM, ENCODE, N_("Could not encode stream."));
237 TABLE (t, STREAM, DEMUX, N_("Could not demultiplex stream."));
238 TABLE (t, STREAM, MUX, N_("Could not multiplex stream."));
239 TABLE (t, STREAM, FORMAT, N_("The stream is in the wrong format."));
245 QUARK_FUNC (library);
246 QUARK_FUNC (resource);
250 * gst_error_get_message:
251 * @domain: the GStreamer error domain this error belongs to.
252 * @code: the error code belonging to the domain.
254 * Get a string describing the error message in the current locale.
256 * Returns: a newly allocated string describing the error message in the
260 gst_error_get_message (GQuark domain, gint code)
262 static gchar **gst_core_errors = NULL;
263 static gchar **gst_library_errors = NULL;
264 static gchar **gst_resource_errors = NULL;
265 static gchar **gst_stream_errors = NULL;
267 gchar *message = NULL;
269 /* initialize error message tables if necessary */
270 if (gst_core_errors == NULL)
271 gst_core_errors = _gst_core_errors_init ();
272 if (gst_library_errors == NULL)
273 gst_library_errors = _gst_library_errors_init ();
274 if (gst_resource_errors == NULL)
275 gst_resource_errors = _gst_resource_errors_init ();
276 if (gst_stream_errors == NULL)
277 gst_stream_errors = _gst_stream_errors_init ();
280 if (domain == GST_CORE_ERROR)
281 message = gst_core_errors[code];
282 else if (domain == GST_LIBRARY_ERROR)
283 message = gst_library_errors[code];
284 else if (domain == GST_RESOURCE_ERROR)
285 message = gst_resource_errors[code];
286 else if (domain == GST_STREAM_ERROR)
287 message = gst_stream_errors[code];
289 g_warning ("No error messages for domain %s", g_quark_to_string (domain));
290 return g_strdup_printf (_("No error message for domain %s."),
291 g_quark_to_string (domain));
294 return g_strdup (_(message));
298 ("No standard error message for domain %s and code %d."),
299 g_quark_to_string (domain), code);