1 %{
2 #include "../gst_private.h"
3
4 #include <glib-object.h>
5 #include <glib.h>
6 #include <stdio.h>
7 #include <string.h>
8 #include <stdlib.h>
9
10 #include "../gst-i18n-lib.h"
11
12 #include "../gstconfig.h"
13 #include "../gstparse.h"
14 #include "../gstinfo.h"
15 #include "../gsterror.h"
16 #include "../gststructure.h"
17 #include "../gsturi.h"
18 #include "../gstutils.h"
19 #include "../gstvalue.h"
20 #include "../gstchildproxy.h"
21 #include "types.h"
22
23 /* All error messages in this file are user-visible and need to be translated.
24 * Don't start the message with a capital, and don't end them with a period,
25 * as they will be presented inside a sentence/error.
26 */
27
28 #define YYERROR_VERBOSE 1
29
30 #define YYENABLE_NLS 0
31
32 #ifndef YYLTYPE_IS_TRIVIAL
33 #define YYLTYPE_IS_TRIVIAL 0
34 #endif
35
36 /*******************************************************************************************
37 *** Tracing memory leaks
38 *******************************************************************************************/
39
40 #ifdef __GST_PARSE_TRACE
41 static guint __strings;
42 static guint __links;
43 static guint __chains;
44 gchar *
__gst_parse_strdup(gchar * org)45 __gst_parse_strdup (gchar *org)
46 {
47 gchar *ret;
48 __strings++;
49 ret = g_strdup (org);
50 /* g_print ("ALLOCATED STR (%3u): %p %s\n", __strings, ret, ret); */
51 return ret;
52 }
53 void
__gst_parse_strfree(gchar * str)54 __gst_parse_strfree (gchar *str)
55 {
56 if (str) {
57 /* g_print ("FREEING STR (%3u): %p %s\n", __strings - 1, str, str); */
58 g_free (str);
59 g_return_if_fail (__strings > 0);
60 __strings--;
61 }
62 }
__gst_parse_link_new(void)63 link_t *__gst_parse_link_new (void)
64 {
65 link_t *ret;
66 __links++;
67 ret = g_slice_new0 (link_t);
68 /* g_print ("ALLOCATED LINK (%3u): %p\n", __links, ret); */
69 return ret;
70 }
71 void
__gst_parse_link_free(link_t * data)72 __gst_parse_link_free (link_t *data)
73 {
74 if (data) {
75 /* g_print ("FREEING LINK (%3u): %p\n", __links - 1, data); */
76 g_slice_free (link_t, data);
77 g_return_if_fail (__links > 0);
78 __links--;
79 }
80 }
81 chain_t *
__gst_parse_chain_new(void)82 __gst_parse_chain_new (void)
83 {
84 chain_t *ret;
85 __chains++;
86 ret = g_slice_new0 (chain_t);
87 /* g_print ("@%p: ALLOCATED CHAIN (%3u):\n", ret, __chains); */
88 return ret;
89 }
90 void
__gst_parse_chain_free(chain_t * data)91 __gst_parse_chain_free (chain_t *data)
92 {
93 /* g_print ("@%p: FREEING CHAIN (%3u):\n", data, __chains - 1); */
94 g_slice_free (chain_t, data);
95 g_return_if_fail (__chains > 0);
96 __chains--;
97 }
98
99 #endif /* __GST_PARSE_TRACE */
100
101 /*******************************************************************************************
102 *** define SET_ERROR macro/function
103 *******************************************************************************************/
104 #ifdef G_HAVE_ISO_VARARGS
105
106 # define SET_ERROR(error, type, ...) \
107 G_STMT_START { \
108 GST_CAT_ERROR (GST_CAT_PIPELINE, __VA_ARGS__); \
109 if ((error) && !*(error)) { \
110 g_set_error ((error), GST_PARSE_ERROR, (type), __VA_ARGS__); \
111 } \
112 } G_STMT_END
113
114 #elif defined(G_HAVE_GNUC_VARARGS)
115
116 # define SET_ERROR(error, type, args...) \
117 G_STMT_START { \
118 GST_CAT_ERROR (GST_CAT_PIPELINE, args ); \
119 if ((error) && !*(error)) { \
120 g_set_error ((error), GST_PARSE_ERROR, (type), args ); \
121 } \
122 } G_STMT_END
123
124 #else
125
126 static inline void
SET_ERROR(GError ** error,gint type,const char * format,...)127 SET_ERROR (GError **error, gint type, const char *format, ...)
128 {
129 if (error) {
130 if (*error) {
131 g_warning ("error while parsing");
132 } else {
133 va_list varargs;
134 char *string;
135
136 va_start (varargs, format);
137 string = g_strdup_vprintf (format, varargs);
138 va_end (varargs);
139
140 g_set_error (error, GST_PARSE_ERROR, type, string);
141
142 g_free (string);
143 }
144 }
145 }
146
147 #endif /* G_HAVE_ISO_VARARGS */
148
149 /*** define YYPRINTF macro/function if we're debugging */
150
151 /* bison 1.35 calls this macro with side effects, we need to make sure the
152 side effects work - crappy bison */
153
154 #ifndef GST_DISABLE_GST_DEBUG
155 # define YYDEBUG 1
156
157 # ifdef G_HAVE_ISO_VARARGS
158
159 /* # define YYFPRINTF(a, ...) GST_CAT_DEBUG (GST_CAT_PIPELINE, __VA_ARGS__) */
160 # define YYFPRINTF(a, ...) \
161 G_STMT_START { \
162 GST_CAT_LOG (GST_CAT_PIPELINE, __VA_ARGS__); \
163 } G_STMT_END
164
165 # elif defined(G_HAVE_GNUC_VARARGS)
166
167 # define YYFPRINTF(a, args...) \
168 G_STMT_START { \
169 GST_CAT_LOG (GST_CAT_PIPELINE, args); \
170 } G_STMT_END
171
172 # else
173
174 static inline void
YYPRINTF(const char * format,...)175 YYPRINTF(const char *format, ...)
176 {
177 va_list varargs;
178 gchar *temp;
179
180 va_start (varargs, format);
181 temp = g_strdup_vprintf (format, varargs);
182 GST_CAT_LOG (GST_CAT_PIPELINE, "%s", temp);
183 g_free (temp);
184 va_end (varargs);
185 }
186
187 # endif /* G_HAVE_ISO_VARARGS */
188
189 #endif /* GST_DISABLE_GST_DEBUG */
190
191
192 /*
193 * include headers generated by bison & flex, after defining (or not defining) YYDEBUG
194 */
195 #include "grammar.tab.h"
196 #include "parse_lex.h"
197
198 /*******************************************************************************************
199 *** report missing elements/bins/..
200 *******************************************************************************************/
201
202
add_missing_element(graph_t * graph,gchar * name)203 static void add_missing_element(graph_t *graph,gchar *name){
204 if ((graph)->ctx){
205 (graph)->ctx->missing_elements = g_list_append ((graph)->ctx->missing_elements, g_strdup (name));
206 }
207 }
208
209
210 /*******************************************************************************************
211 *** helpers for pipeline-setup
212 *******************************************************************************************/
213
214 #define TRY_SETUP_LINK(l) G_STMT_START { \
215 if( (!(l)->src.element) && (!(l)->src.name) ){ \
216 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link has no source [sink=%s@%p]"), \
217 (l)->sink.name ? (l)->sink.name : "", \
218 (l)->sink.element); \
219 gst_parse_free_link (l); \
220 }else if( (!(l)->sink.element) && (!(l)->sink.name) ){ \
221 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link has no sink [source=%s@%p]"), \
222 (l)->src.name ? (l)->src.name : "", \
223 (l)->src.element); \
224 gst_parse_free_link (l); \
225 }else{ \
226 graph->links = g_slist_append (graph->links, l ); \
227 } \
228 } G_STMT_END
229
230 typedef struct {
231 gchar *src_pad;
232 gchar *sink_pad;
233 GstElement *sink;
234 GstCaps *caps;
235 gulong pad_added_signal_id, no_more_pads_signal_id;
236 gboolean all_pads;
237 } DelayedLink;
238
239 typedef struct {
240 gchar *name;
241 gchar *value_str;
242 gulong signal_id;
243 } DelayedSet;
244
gst_resolve_reference(reference_t * rr,GstElement * pipeline)245 static int gst_resolve_reference(reference_t *rr, GstElement *pipeline){
246 GstBin *bin;
247
248 if(rr->element) return 0; /* already resolved! */
249 if(!rr->name) return -2; /* no chance! */
250
251 if (GST_IS_BIN (pipeline)){
252 bin = GST_BIN (pipeline);
253 rr->element = gst_bin_get_by_name_recurse_up (bin, rr->name);
254 } else {
255 rr->element = strcmp (GST_ELEMENT_NAME (pipeline), rr->name) == 0 ?
256 gst_object_ref(pipeline) : NULL;
257 }
258 if(rr->element) return 0; /* resolved */
259 else return -1; /* not found */
260 }
261
gst_parse_free_delayed_set(DelayedSet * set)262 static void gst_parse_free_delayed_set (DelayedSet *set)
263 {
264 g_free(set->name);
265 g_free(set->value_str);
266 g_slice_free(DelayedSet, set);
267 }
268
269 static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object,
270 const gchar * name, gpointer data);
271
gst_parse_add_delayed_set(GstElement * element,gchar * name,gchar * value_str)272 static void gst_parse_add_delayed_set (GstElement *element, gchar *name, gchar *value_str)
273 {
274 DelayedSet *data = g_slice_new0 (DelayedSet);
275
276 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "delaying property set %s to %s",
277 name, value_str);
278
279 data->name = g_strdup(name);
280 data->value_str = g_strdup(value_str);
281 data->signal_id = g_signal_connect_data(element, "child-added",
282 G_CALLBACK (gst_parse_new_child), data, (GClosureNotify)
283 gst_parse_free_delayed_set, (GConnectFlags) 0);
284
285 /* FIXME: we would need to listen on all intermediate bins too */
286 if (GST_IS_BIN (element)) {
287 gchar **names, **current;
288 GstElement *parent, *child;
289
290 current = names = g_strsplit (name, "::", -1);
291 parent = gst_bin_get_by_name (GST_BIN_CAST (element), current[0]);
292 current++;
293 while (parent && current[0]) {
294 child = gst_bin_get_by_name (GST_BIN (parent), current[0]);
295 if (!child && current[1]) {
296 char *sub_name = g_strjoinv ("::", ¤t[0]);
297
298 gst_parse_add_delayed_set(parent, sub_name, value_str);
299 g_free (sub_name);
300 }
301 gst_object_unref (parent);
302 parent = child;
303 current++;
304 }
305 if (parent)
306 gst_object_unref (parent);
307 g_strfreev (names);
308 }
309 }
310
gst_parse_new_child(GstChildProxy * child_proxy,GObject * object,const gchar * name,gpointer data)311 static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object,
312 const gchar * name, gpointer data)
313 {
314 DelayedSet *set = (DelayedSet *) data;
315 GParamSpec *pspec;
316 GValue v = { 0, };
317 GObject *target = NULL;
318 GType value_type;
319
320 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, child_proxy, "new child %s, checking property %s",
321 name, set->name);
322
323 if (gst_child_proxy_lookup (child_proxy, set->name, &target, &pspec)) {
324 gboolean got_value = FALSE;
325
326 value_type = pspec->value_type;
327
328 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, child_proxy, "parsing delayed property %s as a %s from %s",
329 pspec->name, g_type_name (value_type), set->value_str);
330 g_value_init (&v, value_type);
331 if (gst_value_deserialize (&v, set->value_str))
332 got_value = TRUE;
333 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
334 GstElement *bin;
335
336 bin = gst_parse_bin_from_description_full (set->value_str, TRUE, NULL,
337 GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_PLACE_IN_BIN, NULL);
338 if (bin) {
339 g_value_set_object (&v, bin);
340 got_value = TRUE;
341 }
342 }
343 g_signal_handler_disconnect (child_proxy, set->signal_id);
344 if (!got_value)
345 goto error;
346 g_object_set_property (target, pspec->name, &v);
347 } else {
348 const gchar *obj_name = GST_OBJECT_NAME(object);
349 gint len = strlen (obj_name);
350
351 /* do a delayed set */
352 if ((strlen (set->name) > (len + 2)) && !strncmp (set->name, obj_name, len) && !strncmp (&set->name[len], "::", 2)) {
353 gst_parse_add_delayed_set (GST_ELEMENT(child_proxy), set->name, set->value_str);
354 }
355 }
356
357 out:
358 if (G_IS_VALUE (&v))
359 g_value_unset (&v);
360 if (target)
361 g_object_unref (target);
362 return;
363
364 error:
365 GST_CAT_ERROR (GST_CAT_PIPELINE, "could not set property \"%s\" in %"
366 GST_PTR_FORMAT, pspec->name, target);
367 goto out;
368 }
369
gst_parse_element_set(gchar * value,GstElement * element,graph_t * graph)370 static void gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph)
371 {
372 GParamSpec *pspec = NULL;
373 gchar *pos = value;
374 GValue v = { 0, };
375 GObject *target = NULL;
376 GType value_type;
377
378 /* do nothing if assignment is for missing element */
379 if (element == NULL)
380 goto out;
381
382 /* parse the string, so the property name is null-terminated and pos points
383 to the beginning of the value */
384 while (!g_ascii_isspace (*pos) && (*pos != '=')) pos++;
385 if (*pos == '=') {
386 *pos = '\0';
387 } else {
388 *pos = '\0';
389 pos++;
390 while (g_ascii_isspace (*pos)) pos++;
391 }
392 pos++;
393 while (g_ascii_isspace (*pos)) pos++;
394 /* truncate a string if it is delimited with double quotes */
395 if (*pos == '"' && pos[strlen (pos) - 1] == '"') {
396 pos++;
397 pos[strlen (pos) - 1] = '\0';
398 }
399 gst_parse_unescape (pos);
400
401 if (GST_IS_CHILD_PROXY (element)) {
402 if (!gst_child_proxy_lookup (GST_CHILD_PROXY (element), value, &target, &pspec)) {
403 /* do a delayed set */
404 gst_parse_add_delayed_set (element, value, pos);
405 }
406 } else {
407 pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element), value);
408 if (pspec != NULL) {
409 target = G_OBJECT (g_object_ref (element));
410 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, target, "found %s property", value);
411 } else {
412 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \
413 _("no property \"%s\" in element \"%s\""), value, \
414 GST_ELEMENT_NAME (element));
415 }
416 }
417
418 if (pspec != NULL && target != NULL) {
419 gboolean got_value = FALSE;
420
421 value_type = pspec->value_type;
422
423 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "parsing property %s as a %s",
424 pspec->name, g_type_name (value_type));
425
426 g_value_init (&v, value_type);
427 if (gst_value_deserialize (&v, pos))
428 got_value = TRUE;
429 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
430 GstElement *bin;
431
432 bin = gst_parse_bin_from_description_full (pos, TRUE, NULL,
433 GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_PLACE_IN_BIN, NULL);
434 if (bin) {
435 g_value_set_object (&v, bin);
436 got_value = TRUE;
437 }
438 }
439 if (!got_value)
440 goto error;
441 g_object_set_property (target, pspec->name, &v);
442 }
443
444 out:
445 gst_parse_strfree (value);
446 if (G_IS_VALUE (&v))
447 g_value_unset (&v);
448 if (target)
449 g_object_unref (target);
450 return;
451
452 error:
453 SET_ERROR (graph->error, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY,
454 _("could not set property \"%s\" in element \"%s\" to \"%s\""),
455 value, GST_ELEMENT_NAME (element), pos);
456 goto out;
457 }
458
gst_parse_free_reference(reference_t * rr)459 static void gst_parse_free_reference (reference_t *rr)
460 {
461 if(rr->element) gst_object_unref(rr->element);
462 gst_parse_strfree (rr->name);
463 g_slist_foreach (rr->pads, (GFunc) gst_parse_strfree, NULL);
464 g_slist_free (rr->pads);
465 }
466
gst_parse_free_link(link_t * link)467 static void gst_parse_free_link (link_t *link)
468 {
469 gst_parse_free_reference (&(link->src));
470 gst_parse_free_reference (&(link->sink));
471 if (link->caps) gst_caps_unref (link->caps);
472 gst_parse_link_free (link);
473 }
474
gst_parse_free_chain(chain_t * ch)475 static void gst_parse_free_chain (chain_t *ch)
476 {
477 GSList *walk;
478 gst_parse_free_reference (&(ch->first));
479 gst_parse_free_reference (&(ch->last));
480 for(walk=ch->elements;walk;walk=walk->next)
481 gst_object_unref (walk->data);
482 g_slist_free (ch->elements);
483 gst_parse_chain_free (ch);
484 }
485
gst_parse_free_delayed_link(DelayedLink * link)486 static void gst_parse_free_delayed_link (DelayedLink *link)
487 {
488 g_free (link->src_pad);
489 g_free (link->sink_pad);
490 if (link->caps) gst_caps_unref (link->caps);
491 g_slice_free (DelayedLink, link);
492 }
493
494 #define PRETTY_PAD_NAME_FMT "%s %s of %s named %s"
495 #define PRETTY_PAD_NAME_ARGS(elem, pad_name) \
496 (pad_name ? "pad " : "some"), (pad_name ? pad_name : "pad"), \
497 G_OBJECT_TYPE_NAME(elem), GST_STR_NULL (GST_ELEMENT_NAME (elem))
498
gst_parse_no_more_pads(GstElement * src,gpointer data)499 static void gst_parse_no_more_pads (GstElement *src, gpointer data)
500 {
501 DelayedLink *link = data;
502
503 /* Don't warn for all-pads links, as we expect those to
504 * still be active at no-more-pads */
505 if (!link->all_pads) {
506 GST_ELEMENT_WARNING(src, PARSE, DELAYED_LINK,
507 (_("Delayed linking failed.")),
508 ("failed delayed linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT,
509 PRETTY_PAD_NAME_ARGS (src, link->src_pad),
510 PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad)));
511 }
512 /* we keep the handlers connected, so that in case an element still adds a pad
513 * despite no-more-pads, we will consider it for pending delayed links */
514 }
515
gst_parse_found_pad(GstElement * src,GstPad * pad,gpointer data)516 static void gst_parse_found_pad (GstElement *src, GstPad *pad, gpointer data)
517 {
518 DelayedLink *link = data;
519
520 GST_CAT_INFO (GST_CAT_PIPELINE,
521 "trying delayed linking %s " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT,
522 link->all_pads ? "all pads" : "one pad",
523 PRETTY_PAD_NAME_ARGS (src, link->src_pad),
524 PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad));
525
526 if (gst_element_link_pads_filtered (src, link->src_pad, link->sink,
527 link->sink_pad, link->caps)) {
528 /* do this here, we don't want to get any problems later on when
529 * unlocking states */
530 GST_CAT_DEBUG (GST_CAT_PIPELINE,
531 "delayed linking %s " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " worked",
532 link->all_pads ? "all pads" : "one pad",
533 PRETTY_PAD_NAME_ARGS (src, link->src_pad),
534 PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad));
535 g_signal_handler_disconnect (src, link->no_more_pads_signal_id);
536 /* releases 'link' */
537 if (!link->all_pads)
538 g_signal_handler_disconnect (src, link->pad_added_signal_id);
539 }
540 }
541
542 /* both padnames and the caps may be NULL */
543 static gboolean
gst_parse_perform_delayed_link(GstElement * src,const gchar * src_pad,GstElement * sink,const gchar * sink_pad,GstCaps * caps,gboolean all_pads)544 gst_parse_perform_delayed_link (GstElement *src, const gchar *src_pad,
545 GstElement *sink, const gchar *sink_pad,
546 GstCaps *caps, gboolean all_pads)
547 {
548 GList *templs = gst_element_class_get_pad_template_list (
549 GST_ELEMENT_GET_CLASS (src));
550
551 for (; templs; templs = templs->next) {
552 GstPadTemplate *templ = (GstPadTemplate *) templs->data;
553 if ((GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) &&
554 (GST_PAD_TEMPLATE_PRESENCE(templ) == GST_PAD_SOMETIMES))
555 {
556 DelayedLink *data = g_slice_new (DelayedLink);
557
558 data->all_pads = all_pads;
559
560 /* TODO: maybe we should check if src_pad matches this template's names */
561
562 GST_CAT_DEBUG (GST_CAT_PIPELINE,
563 "trying delayed link " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT,
564 PRETTY_PAD_NAME_ARGS (src, src_pad),
565 PRETTY_PAD_NAME_ARGS (sink, sink_pad));
566
567 data->src_pad = g_strdup (src_pad);
568 data->sink = sink;
569 data->sink_pad = g_strdup (sink_pad);
570 if (caps) {
571 data->caps = gst_caps_copy (caps);
572 } else {
573 data->caps = NULL;
574 }
575 data->pad_added_signal_id = g_signal_connect_data (src, "pad-added",
576 G_CALLBACK (gst_parse_found_pad), data,
577 (GClosureNotify) gst_parse_free_delayed_link, (GConnectFlags) 0);
578 data->no_more_pads_signal_id = g_signal_connect (src, "no-more-pads",
579 G_CALLBACK (gst_parse_no_more_pads), data);
580 return TRUE;
581 }
582 }
583 return FALSE;
584 }
585
586 static gboolean
gst_parse_element_can_do_caps(GstElement * e,GstPadDirection dir,GstCaps * link_caps)587 gst_parse_element_can_do_caps (GstElement * e, GstPadDirection dir,
588 GstCaps * link_caps)
589 {
590 gboolean can_do = FALSE, done = FALSE;
591 GstIterator *it;
592
593 it = (dir == GST_PAD_SRC) ? gst_element_iterate_src_pads (e) : gst_element_iterate_sink_pads (e);
594
595 while (!done && !can_do) {
596 GValue v = G_VALUE_INIT;
597 GstPad *pad;
598 GstCaps *caps;
599
600 switch (gst_iterator_next (it, &v)) {
601 case GST_ITERATOR_OK:
602 pad = g_value_get_object (&v);
603
604 caps = gst_pad_get_current_caps (pad);
605 if (caps == NULL)
606 caps = gst_pad_query_caps (pad, NULL);
607
608 can_do = gst_caps_can_intersect (caps, link_caps);
609
610 GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT,
611 can_do, caps, link_caps);
612
613 gst_caps_unref (caps);
614
615 g_value_unset (&v);
616 break;
617 case GST_ITERATOR_DONE:
618 case GST_ITERATOR_ERROR:
619 done = TRUE;
620 break;
621 case GST_ITERATOR_RESYNC:
622 gst_iterator_resync (it);
623 break;
624 }
625 }
626
627 gst_iterator_free (it);
628
629 return can_do;
630 }
631
632 /*
633 * performs a link and frees the struct. src and sink elements must be given
634 * return values 0 - link performed
635 * 1 - link delayed
636 * <0 - error
637 */
638 static gint
gst_parse_perform_link(link_t * link,graph_t * graph)639 gst_parse_perform_link (link_t *link, graph_t *graph)
640 {
641 GstElement *src = link->src.element;
642 GstElement *sink = link->sink.element;
643 GSList *srcs = link->src.pads;
644 GSList *sinks = link->sink.pads;
645 g_assert (GST_IS_ELEMENT (src));
646 g_assert (GST_IS_ELEMENT (sink));
647
648 GST_CAT_INFO (GST_CAT_PIPELINE,
649 "linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " (%u/%u) with caps \"%" GST_PTR_FORMAT "\"",
650 PRETTY_PAD_NAME_ARGS (src, link->src.name),
651 PRETTY_PAD_NAME_ARGS (sink, link->sink.name),
652 g_slist_length (srcs), g_slist_length (sinks), link->caps);
653
654 if (!srcs || !sinks) {
655 gboolean found_one = gst_element_link_pads_filtered (src,
656 srcs ? (const gchar *) srcs->data : NULL, sink,
657 sinks ? (const gchar *) sinks->data : NULL, link->caps);
658
659 if (found_one) {
660 if (!link->all_pads)
661 goto success; /* Linked one, and not an all-pads link = we're done */
662
663 /* Try and link more available pads */
664 while (gst_element_link_pads_filtered (src,
665 srcs ? (const gchar *) srcs->data : NULL, sink,
666 sinks ? (const gchar *) sinks->data : NULL, link->caps));
667 }
668
669 /* We either didn't find any static pads, or this is a all-pads link,
670 * in which case watch for future pads and link those. Not a failure
671 * in the all-pads case if there's no sometimes pads to watch */
672 if (gst_parse_perform_delayed_link (src,
673 srcs ? (const gchar *) srcs->data : NULL,
674 sink, sinks ? (const gchar *) sinks->data : NULL, link->caps,
675 link->all_pads) || link->all_pads) {
676 goto success;
677 } else {
678 goto error;
679 }
680 }
681 if (g_slist_length (link->src.pads) != g_slist_length (link->sink.pads)) {
682 goto error;
683 }
684 while (srcs && sinks) {
685 const gchar *src_pad = (const gchar *) srcs->data;
686 const gchar *sink_pad = (const gchar *) sinks->data;
687 srcs = g_slist_next (srcs);
688 sinks = g_slist_next (sinks);
689 if (gst_element_link_pads_filtered (src, src_pad, sink, sink_pad,
690 link->caps)) {
691 continue;
692 } else {
693 if (gst_parse_perform_delayed_link (src, src_pad,
694 sink, sink_pad,
695 link->caps, link->all_pads)) {
696 continue;
697 } else {
698 goto error;
699 }
700 }
701 }
702
703 success:
704 gst_parse_free_link (link);
705 return 0;
706
707 error:
708 if (link->caps != NULL) {
709 gboolean src_can_do_caps, sink_can_do_caps;
710 gchar *caps_str = gst_caps_to_string (link->caps);
711
712 src_can_do_caps =
713 gst_parse_element_can_do_caps (src, GST_PAD_SRC, link->caps);
714 sink_can_do_caps =
715 gst_parse_element_can_do_caps (sink, GST_PAD_SINK, link->caps);
716
717 if (!src_can_do_caps && sink_can_do_caps) {
718 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
719 _("could not link %s to %s, %s can't handle caps %s"),
720 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
721 GST_ELEMENT_NAME (src), caps_str);
722 } else if (src_can_do_caps && !sink_can_do_caps) {
723 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
724 _("could not link %s to %s, %s can't handle caps %s"),
725 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
726 GST_ELEMENT_NAME (sink), caps_str);
727 } else if (!src_can_do_caps && !sink_can_do_caps) {
728 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
729 _("could not link %s to %s, neither element can handle caps %s"),
730 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
731 } else {
732 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
733 _("could not link %s to %s with caps %s"),
734 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
735 }
736 g_free (caps_str);
737 } else {
738 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
739 _("could not link %s to %s"), GST_ELEMENT_NAME (src),
740 GST_ELEMENT_NAME (sink));
741 }
742 gst_parse_free_link (link);
743 return -1;
744 }
745
746
747 static int yyerror (void *scanner, graph_t *graph, const char *s);
748 %}
749
750 %union {
751 gchar *ss;
752 chain_t *cc;
753 link_t *ll;
754 reference_t rr;
755 GstElement *ee;
756 GSList *pp;
757 graph_t *gg;
758 }
759
760 /* No grammar ambiguities expected, FAIL otherwise */
761 %expect 0
762
763 %token <ss> PARSE_URL
764 %token <ss> IDENTIFIER
765 %left <ss> REF PADREF BINREF
766 %token <ss> ASSIGNMENT
767 %token <ss> LINK
768 %token <ss> LINK_ALL
769
770 %type <ss> binopener
771 %type <gg> graph
772 %type <cc> chain bin chainlist openchain elementary
773 %type <rr> reference
774 %type <ll> link
775 %type <ee> element
776 %type <pp> morepads pads assignments
777
778 %destructor { gst_parse_strfree ($$); } <ss>
779 %destructor { if($$)
780 gst_parse_free_chain($$); } <cc>
781 %destructor { gst_parse_free_link ($$); } <ll>
782 %destructor { gst_parse_free_reference(&($$));} <rr>
783 %destructor { gst_object_unref ($$); } <ee>
784 %destructor { GSList *walk;
785 for(walk=$$;walk;walk=walk->next)
786 gst_parse_strfree (walk->data);
787 g_slist_free ($$); } <pp>
788
789
790
791 %left '(' ')'
792 %left ','
793 %right '.'
794 %left '!' '=' ':'
795
796 %lex-param { void *scanner }
797 %parse-param { void *scanner }
798 %parse-param { graph_t *graph }
799 %pure-parser
800
801 %start graph
802 %%
803
804 /*************************************************************
805 * Grammar explanation:
806 * _element_s are specified by an identifier of their type.
807 * a name can be give in the optional property-assignments
808 * coffeeelement
809 * fakesrc name=john
810 * identity silence=false name=frodo
811 * (cont'd)
812 **************************************************************/
813 element: IDENTIFIER { $$ = gst_element_factory_make ($1, NULL);
814 if ($$ == NULL) {
815 add_missing_element(graph, $1);
816 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), $1);
817 }
818 gst_parse_strfree ($1);
819 }
820 | element ASSIGNMENT { gst_parse_element_set ($2, $1, graph);
821 $$ = $1;
822 }
823 ;
824
825 /*************************************************************
826 * Grammar explanation: (cont'd)
827 * a graph has (pure) _element_s, _bin_s and _link_s.
828 * since bins are special elements, bins and elements can
829 * be generalized as _elementary_.
830 * The construction of _bin_s will be discussed later.
831 * (cont'd)
832 *
833 **************************************************************/
834 elementary:
835 element { $$ = gst_parse_chain_new ();
836 /* g_print ("@%p: CHAINing elementary\n", $$); */
837 $$->first.element = $1? gst_object_ref($1) : NULL;
838 $$->last.element = $1? gst_object_ref($1) : NULL;
839 $$->first.name = $$->last.name = NULL;
840 $$->first.pads = $$->last.pads = NULL;
841 $$->elements = $1 ? g_slist_prepend (NULL, $1) : NULL;
842 }
843 | bin { $$=$1; }
844 ;
845
846 /*************************************************************
847 * Grammar explanation: (cont'd)
848 * a _chain_ is a list of _elementary_s that have _link_s in between
849 * which are represented through infix-notation.
850 *
851 * fakesrc ! sometransformation ! fakesink
852 *
853 * every _link_ can be augmented with _pads_.
854 *
855 * coffeesrc .sound ! speakersink
856 * multisrc .movie,ads ! .projector,smallscreen multisink
857 *
858 * and every _link_ can be setup to filter media-types
859 * mediasrc ! audio/x-raw, signed=TRUE ! stereosink
860 *
861 * User HINT:
862 * if the lexer does not recognize your media-type it
863 * will make it an element name. that results in errors
864 * like
865 * NO SUCH ELEMENT: no element audio7x-raw
866 * '7' vs. '/' in https://en.wikipedia.org/wiki/QWERTZ
867 *
868 * Parsing HINT:
869 * in the parser we need to differ between chains that can
870 * be extended by more elementaries (_openchain_) and others
871 * that are syntactically closed (handled later in this file).
872 * (e.g. fakesrc ! sinkreferencename.padname)
873 **************************************************************/
874 chain: openchain { $$=$1;
875 if($$->last.name){
876 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX,
877 _("unexpected reference \"%s\" - ignoring"), $$->last.name);
878 gst_parse_strfree($$->last.name);
879 $$->last.name=NULL;
880 }
881 if($$->last.pads){
882 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX,
883 _("unexpected pad-reference \"%s\" - ignoring"), (gchar*)$$->last.pads->data);
884 g_slist_foreach ($$->last.pads, (GFunc) gst_parse_strfree, NULL);
885 g_slist_free ($$->last.pads);
886 $$->last.pads=NULL;
887 }
888 }
889 ;
890
891 openchain:
892 elementary pads { $$=$1;
893 $$->last.pads = g_slist_concat ($$->last.pads, $2);
894 /* g_print ("@%p@%p: FKI elementary pads\n", $1, $$->last.pads); */
895 }
896 | openchain link pads elementary pads
897 {
898 $2->src = $1->last;
899 $2->sink = $4->first;
900 $2->sink.pads = g_slist_concat ($3, $2->sink.pads);
901 TRY_SETUP_LINK($2);
902 $4->first = $1->first;
903 $4->elements = g_slist_concat ($1->elements, $4->elements);
904 gst_parse_chain_free($1);
905 $$ = $4;
906 $$->last.pads = g_slist_concat ($$->last.pads, $5);
907 }
908 ;
909
910 link: LINK { $$ = gst_parse_link_new ();
911 $$->all_pads = FALSE;
912 if ($1) {
913 $$->caps = gst_caps_from_string ($1);
914 if ($$->caps == NULL)
915 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1);
916 gst_parse_strfree ($1);
917 }
918 }
919 | LINK_ALL { $$ = gst_parse_link_new ();
920 $$->all_pads = TRUE;
921 if ($1) {
922 $$->caps = gst_caps_from_string ($1);
923 if ($$->caps == NULL)
924 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1);
925 gst_parse_strfree ($1);
926 }
927 }
928 ;
929 pads: /* NOP */ { $$ = NULL; }
930 | PADREF morepads { $$ = $2;
931 $$ = g_slist_prepend ($$, $1);
932 }
933 ;
934 morepads: /* NOP */ { $$ = NULL; }
935 | ',' IDENTIFIER morepads { $$ = g_slist_prepend ($3, $2); }
936 ;
937
938 /*************************************************************
939 * Grammar explanation: (cont'd)
940 * the first and last elements of a _chain_ can be give
941 * as URL. This creates special elements that fit the URL.
942 *
943 * fakesrc ! http://fake-sink.org
944 * http://somesource.org ! fakesink
945 **************************************************************/
946
947 chain: openchain link PARSE_URL { GstElement *element =
948 gst_element_make_from_uri (GST_URI_SINK, $3, NULL, NULL);
949 /* FIXME: get and parse error properly */
950 if (!element) {
951 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
952 _("no sink element for URI \"%s\""), $3);
953 }
954 $$ = $1;
955 $2->sink.element = element?gst_object_ref(element):NULL;
956 $2->src = $1->last;
957 TRY_SETUP_LINK($2);
958 $$->last.element = NULL;
959 $$->last.name = NULL;
960 $$->last.pads = NULL;
961 if(element) $$->elements = g_slist_append ($$->elements, element);
962 g_free ($3);
963 }
964 ;
965 openchain:
966 PARSE_URL { GstElement *element =
967 gst_element_make_from_uri (GST_URI_SRC, $1, NULL, NULL);
968 /* FIXME: get and parse error properly */
969 if (!element) {
970 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
971 _("no source element for URI \"%s\""), $1);
972 }
973 $$ = gst_parse_chain_new ();
974 /* g_print ("@%p: CHAINing srcURL\n", $$); */
975 $$->first.element = NULL;
976 $$->first.name = NULL;
977 $$->first.pads = NULL;
978 $$->last.element = element ? gst_object_ref(element):NULL;
979 $$->last.name = NULL;
980 $$->last.pads = NULL;
981 $$->elements = element ? g_slist_prepend (NULL, element) : NULL;
982 g_free($1);
983 }
984 ;
985
986
987 /*************************************************************
988 * Grammar explanation: (cont'd)
989 * the first and last elements of a _chain_ can be linked
990 * to a named _reference_ (with optional pads).
991 *
992 * fakesrc ! nameOfSinkElement.
993 * fakesrc ! nameOfSinkElement.Padname
994 * fakesrc ! nameOfSinkElement.Padname, anotherPad
995 * nameOfSource.Padname ! fakesink
996 **************************************************************/
997
998 chain: openchain link reference { $$ = $1;
999 $2->sink= $3;
1000 $2->src = $1->last;
1001 TRY_SETUP_LINK($2);
1002 $$->last.element = NULL;
1003 $$->last.name = NULL;
1004 $$->last.pads = NULL;
1005 }
1006 ;
1007
1008
1009 openchain:
1010 reference { $$ = gst_parse_chain_new ();
1011 $$->last=$1;
1012 $$->first.element = NULL;
1013 $$->first.name = NULL;
1014 $$->first.pads = NULL;
1015 $$->elements = NULL;
1016 }
1017 ;
1018 reference: REF morepads {
1019 gchar *padname = $1;
1020 GSList *pads = $2;
1021 if (padname) {
1022 while (*padname != '.') padname++;
1023 *padname = '\0';
1024 padname++;
1025 if (*padname != '\0')
1026 pads = g_slist_prepend (pads, gst_parse_strdup (padname));
1027 }
1028 $$.element=NULL;
1029 $$.name=$1;
1030 $$.pads=pads;
1031 }
1032 ;
1033
1034
1035 /*************************************************************
1036 * Grammar explanation: (cont'd)
1037 * a _chainlist_ is just a list of _chain_s.
1038 *
1039 * You can specify _link_s with named
1040 * _reference_ on each side. That
1041 * works already after the explanations above.
1042 * someSourceName.Pad ! someSinkName.
1043 * someSourceName.Pad,anotherPad ! someSinkName.Apad,Bpad
1044 *
1045 * If a syntax error occurs, the already finished _chain_s
1046 * and _links_ are kept intact.
1047 *************************************************************/
1048
1049 chainlist: /* NOP */ { $$ = NULL; }
1050 | chainlist chain { if ($1){
1051 gst_parse_free_reference(&($1->last));
1052 gst_parse_free_reference(&($2->first));
1053 $2->first = $1->first;
1054 $2->elements = g_slist_concat ($1->elements, $2->elements);
1055 gst_parse_chain_free ($1);
1056 }
1057 $$ = $2;
1058 }
1059 | chainlist error { $$=$1;
1060 GST_CAT_DEBUG (GST_CAT_PIPELINE,"trying to recover from syntax error");
1061 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX, _("syntax error"));
1062 }
1063 ;
1064
1065 /*************************************************************
1066 * Grammar explanation: (cont'd)
1067 * _bins_
1068 *************************************************************/
1069
1070
1071 assignments: /* NOP */ { $$ = NULL; }
1072 | ASSIGNMENT assignments { $$ = g_slist_prepend ($2, $1); }
1073 ;
1074
1075 binopener: '(' { $$ = gst_parse_strdup("bin"); }
1076 | BINREF { $$ = $1; }
1077 ;
1078 bin: binopener assignments chainlist ')' {
1079 chain_t *chain = $3;
1080 GSList *walk;
1081 GstBin *bin = (GstBin *) gst_element_factory_make ($1, NULL);
1082 if (!chain) {
1083 SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY_BIN,
1084 _("specified empty bin \"%s\", not allowed"), $1);
1085 chain = gst_parse_chain_new ();
1086 chain->first.element = chain->last.element = NULL;
1087 chain->first.name = chain->last.name = NULL;
1088 chain->first.pads = chain->last.pads = NULL;
1089 chain->elements = NULL;
1090 }
1091 if (!bin) {
1092 add_missing_element(graph, $1);
1093 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1094 _("no bin \"%s\", unpacking elements"), $1);
1095 /* clear property-list */
1096 g_slist_foreach ($2, (GFunc) gst_parse_strfree, NULL);
1097 g_slist_free ($2);
1098 $2 = NULL;
1099 } else {
1100 for (walk = chain->elements; walk; walk = walk->next )
1101 gst_bin_add (bin, GST_ELEMENT (walk->data));
1102 g_slist_free (chain->elements);
1103 chain->elements = g_slist_prepend (NULL, bin);
1104 }
1105 $$ = chain;
1106 /* set the properties now
1107 * HINT: property-list cleared above, if bin==NULL
1108 */
1109 for (walk = $2; walk; walk = walk->next)
1110 gst_parse_element_set ((gchar *) walk->data,
1111 GST_ELEMENT (bin), graph);
1112 g_slist_free ($2);
1113 gst_parse_strfree ($1);
1114 }
1115 ;
1116
1117 /*************************************************************
1118 * Grammar explanation: (cont'd)
1119 * _graph_
1120 *************************************************************/
1121
1122 graph: chainlist { $$ = graph;
1123 $$->chain = $1;
1124 if(!$1) {
1125 SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY, _("empty pipeline not allowed"));
1126 }
1127 }
1128 ;
1129
1130 %%
1131
1132
1133 static int
1134 yyerror (void *scanner, graph_t *graph, const char *s)
1135 {
1136 /* FIXME: This should go into the GError somehow, but how? */
1137 GST_WARNING ("Error during parsing: %s", s);
1138 return -1;
1139 }
1140
1141
1142 GstElement *
1143 priv_gst_parse_launch (const gchar *str, GError **error, GstParseContext *ctx,
1144 GstParseFlags flags)
1145 {
1146 graph_t g;
1147 gchar *dstr;
1148 GSList *walk;
1149 GstElement *ret;
1150 yyscan_t scanner;
1151
1152 g_return_val_if_fail (str != NULL, NULL);
1153 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1154
1155 g.chain = NULL;
1156 g.links = NULL;
1157 g.error = error;
1158 g.ctx = ctx;
1159 g.flags = flags;
1160
1161 #ifdef __GST_PARSE_TRACE
1162 GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled");
1163 __strings = __chains = __links = 0;
1164 #endif /* __GST_PARSE_TRACE */
1165
1166 /* g_print("Now scanning: %s\n", str); */
1167
1168 dstr = g_strdup (str);
1169 priv_gst_parse_yylex_init (&scanner);
1170 priv_gst_parse_yy_scan_string (dstr, scanner);
1171
1172 #if YYDEBUG
1173 yydebug = 1;
1174 #endif
1175
1176 if (yyparse (scanner, &g) != 0) {
1177 SET_ERROR (error, GST_PARSE_ERROR_SYNTAX,
1178 "Unrecoverable syntax error while parsing pipeline %s", str);
1179
1180 priv_gst_parse_yylex_destroy (scanner);
1181 g_free (dstr);
1182
1183 goto error1;
1184 }
1185 priv_gst_parse_yylex_destroy (scanner);
1186 g_free (dstr);
1187
1188 GST_CAT_DEBUG (GST_CAT_PIPELINE, "got %u elements and %u links",
1189 g.chain ? g_slist_length (g.chain->elements) : 0,
1190 g_slist_length (g.links));
1191
1192 /* ensure chain is not NULL */
1193 if (!g.chain){
1194 g.chain=gst_parse_chain_new ();
1195 g.chain->elements=NULL;
1196 g.chain->first.element=NULL;
1197 g.chain->first.name=NULL;
1198 g.chain->first.pads=NULL;
1199 g.chain->last.element=NULL;
1200 g.chain->last.name=NULL;
1201 g.chain->last.pads=NULL;
1202 };
1203
1204 /* ensure elements is not empty */
1205 if(!g.chain->elements){
1206 g.chain->elements= g_slist_prepend (NULL, NULL);
1207 };
1208
1209 /* put all elements in our bin if necessary */
1210 if(g.chain->elements->next){
1211 GstBin *bin;
1212 if (flags & GST_PARSE_FLAG_PLACE_IN_BIN)
1213 bin = GST_BIN (gst_element_factory_make ("bin", NULL));
1214 else
1215 bin = GST_BIN (gst_element_factory_make ("pipeline", NULL));
1216 g_assert (bin);
1217
1218 for (walk = g.chain->elements; walk; walk = walk->next) {
1219 if (walk->data != NULL)
1220 gst_bin_add (bin, GST_ELEMENT (walk->data));
1221 }
1222 g_slist_free (g.chain->elements);
1223 g.chain->elements = g_slist_prepend (NULL, bin);
1224 }
1225
1226 ret = (GstElement *) g.chain->elements->data;
1227 g_slist_free (g.chain->elements);
1228 g.chain->elements=NULL;
1229 gst_parse_free_chain (g.chain);
1230 g.chain = NULL;
1231
1232
1233 /* resolve and perform links */
1234 for (walk = g.links; walk; walk = walk->next) {
1235 link_t *l = (link_t *) walk->data;
1236 int err;
1237 err=gst_resolve_reference( &(l->src), ret);
1238 if (err) {
1239 if(-1==err){
1240 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1241 "No src-element named \"%s\" - omitting link", l->src.name);
1242 }else{
1243 /* probably a missing element which we've handled already */
1244 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1245 "No src-element found - omitting link");
1246 }
1247 gst_parse_free_link (l);
1248 continue;
1249 }
1250
1251 err=gst_resolve_reference( &(l->sink), ret);
1252 if (err) {
1253 if(-1==err){
1254 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1255 "No sink-element named \"%s\" - omitting link", l->src.name);
1256 }else{
1257 /* probably a missing element which we've handled already */
1258 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1259 "No sink-element found - omitting link");
1260 }
1261 gst_parse_free_link (l);
1262 continue;
1263 }
1264 gst_parse_perform_link (l, &g);
1265 }
1266 g_slist_free (g.links);
1267
1268 out:
1269 #ifdef __GST_PARSE_TRACE
1270 GST_CAT_DEBUG (GST_CAT_PIPELINE,
1271 "TRACE: %u strings, %u chains and %u links left", __strings, __chains,
1272 __links);
1273 if (__strings || __chains || __links) {
1274 g_warning ("TRACE: %u strings, %u chains and %u links left", __strings,
1275 __chains, __links);
1276 }
1277 #endif /* __GST_PARSE_TRACE */
1278
1279 return ret;
1280
1281 error1:
1282 if (g.chain) {
1283 gst_parse_free_chain (g.chain);
1284 g.chain=NULL;
1285 }
1286
1287 g_slist_foreach (g.links, (GFunc)gst_parse_free_link, NULL);
1288 g_slist_free (g.links);
1289
1290 if (error)
1291 g_assert (*error);
1292 ret = NULL;
1293
1294 goto out;
1295 }
1296