2 #include "../gst_private.h"
4 #include <glib-object.h>
10 #include "../gst-i18n-lib.h"
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"
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.
28 #define YYERROR_VERBOSE 1
29 #define YYLEX_PARAM scanner
31 typedef void* yyscan_t;
33 int _gst_parse_yylex (void * yylval_param , yyscan_t yyscanner);
34 int _gst_parse_yylex_init (yyscan_t scanner);
35 int _gst_parse_yylex_destroy (yyscan_t scanner);
36 struct yy_buffer_state * _gst_parse_yy_scan_string (char* , yyscan_t);
37 void _gst_parse_yypush_buffer_state (void * new_buffer ,yyscan_t yyscanner );
38 void _gst_parse_yypop_buffer_state (yyscan_t yyscanner );
40 #ifdef __GST_PARSE_TRACE
41 static guint __strings;
43 static guint __chains;
45 __gst_parse_strdup (gchar *org)
50 /* g_print ("ALLOCATED STR (%3u): %p %s\n", __strings, ret, ret); */
54 __gst_parse_strfree (gchar *str)
57 /* g_print ("FREEING STR (%3u): %p %s\n", __strings - 1, str, str); */
59 g_return_if_fail (__strings > 0);
63 link_t *__gst_parse_link_new ()
67 ret = g_slice_new0 (link_t);
68 /* g_print ("ALLOCATED LINK (%3u): %p\n", __links, ret); */
72 __gst_parse_link_free (link_t *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);
82 __gst_parse_chain_new ()
86 ret = g_slice_new0 (chain_t);
87 /* g_print ("ALLOCATED CHAIN (%3u): %p\n", __chains, ret); */
91 __gst_parse_chain_free (chain_t *data)
93 /* g_print ("FREEING CHAIN (%3u): %p\n", __chains - 1, data); */
94 g_slice_free (chain_t, data);
95 g_return_if_fail (__chains > 0);
99 #endif /* __GST_PARSE_TRACE */
116 /*** define SET_ERROR macro/function */
118 #ifdef G_HAVE_ISO_VARARGS
120 # define SET_ERROR(error, type, ...) \
122 GST_CAT_ERROR (GST_CAT_PIPELINE, __VA_ARGS__); \
123 if ((error) && !*(error)) { \
124 g_set_error ((error), GST_PARSE_ERROR, (type), __VA_ARGS__); \
128 #elif defined(G_HAVE_GNUC_VARARGS)
130 # define SET_ERROR(error, type, args...) \
132 GST_CAT_ERROR (GST_CAT_PIPELINE, args ); \
133 if ((error) && !*(error)) { \
134 g_set_error ((error), GST_PARSE_ERROR, (type), args ); \
141 SET_ERROR (GError **error, gint type, const char *format, ...)
145 g_warning ("error while parsing");
150 va_start (varargs, format);
151 string = g_strdup_vprintf (format, varargs);
154 g_set_error (error, GST_PARSE_ERROR, type, string);
161 #endif /* G_HAVE_ISO_VARARGS */
163 /*** define YYPRINTF macro/function if we're debugging */
165 /* bison 1.35 calls this macro with side effects, we need to make sure the
166 side effects work - crappy bison */
168 #ifndef GST_DISABLE_GST_DEBUG
171 # ifdef G_HAVE_ISO_VARARGS
173 /* # define YYFPRINTF(a, ...) GST_CAT_DEBUG (GST_CAT_PIPELINE, __VA_ARGS__) */
174 # define YYFPRINTF(a, ...) \
176 GST_CAT_LOG (GST_CAT_PIPELINE, __VA_ARGS__); \
179 # elif defined(G_HAVE_GNUC_VARARGS)
181 # define YYFPRINTF(a, args...) \
183 GST_CAT_LOG (GST_CAT_PIPELINE, args); \
189 YYPRINTF(const char *format, ...)
194 va_start (varargs, format);
195 temp = g_strdup_vprintf (format, varargs);
196 GST_CAT_LOG (GST_CAT_PIPELINE, "%s", temp);
201 # endif /* G_HAVE_ISO_VARARGS */
203 #endif /* GST_DISABLE_GST_DEBUG */
205 #define ADD_MISSING_ELEMENT(graph,name) G_STMT_START { \
206 if ((graph)->ctx) { \
207 (graph)->ctx->missing_elements = \
208 g_list_append ((graph)->ctx->missing_elements, g_strdup (name)); \
211 #define GST_BIN_MAKE(res, type, chainval, assign, free_string) \
213 chain_t *chain = chainval; \
215 GstBin *bin = (GstBin *) gst_element_factory_make (type, NULL); \
217 SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY_BIN, \
218 _("specified empty bin \"%s\", not allowed"), type); \
219 g_slist_foreach (assign, (GFunc) gst_parse_strfree, NULL); \
220 g_slist_free (assign); \
221 gst_object_unref (bin); \
223 gst_parse_strfree (type); /* Need to clean up the string */ \
226 ADD_MISSING_ELEMENT(graph, type); \
227 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, \
228 _("no bin \"%s\", skipping"), type); \
229 g_slist_foreach (assign, (GFunc) gst_parse_strfree, NULL); \
230 g_slist_free (assign); \
233 for (walk = chain->elements; walk; walk = walk->next ) \
234 gst_bin_add (bin, GST_ELEMENT (walk->data)); \
235 g_slist_free (chain->elements); \
236 chain->elements = g_slist_prepend (NULL, bin); \
238 /* set the properties now */ \
239 for (walk = assign; walk; walk = walk->next) \
240 gst_parse_element_set ((gchar *) walk->data, GST_ELEMENT (bin), graph); \
241 g_slist_free (assign); \
245 #define MAKE_LINK(link, _src, _src_name, _src_pads, _sink, _sink_name, _sink_pads) \
247 link = gst_parse_link_new (); \
249 link->sink = _sink; \
250 link->src_name = _src_name; \
251 link->sink_name = _sink_name; \
252 link->src_pads = _src_pads; \
253 link->sink_pads = _sink_pads; \
257 #define MAKE_REF(link, _src, _pads) \
259 gchar *padname = _src; \
260 GSList *pads = _pads; \
262 while (*padname != '.') padname++; \
265 if (*padname != '\0') \
266 pads = g_slist_prepend (pads, gst_parse_strdup (padname)); \
268 MAKE_LINK (link, NULL, _src, pads, NULL, NULL, NULL); \
271 static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object,
274 DelayedSet *set = (DelayedSet *) data;
277 GstObject *target = NULL;
280 if (gst_child_proxy_lookup (GST_OBJECT (set->parent), set->name, &target, &pspec)) {
281 gboolean got_value = FALSE;
283 value_type = G_PARAM_SPEC_VALUE_TYPE (pspec);
285 GST_CAT_LOG (GST_CAT_PIPELINE, "parsing delayed property %s as a %s from %s", pspec->name,
286 g_type_name (value_type), set->value_str);
287 g_value_init (&v, value_type);
288 if (gst_value_deserialize (&v, set->value_str))
290 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
293 bin = gst_parse_bin_from_description (set->value_str, TRUE, NULL);
295 g_value_set_object (&v, bin);
299 g_signal_handler_disconnect (child_proxy, set->signal_id);
302 g_object_set_property (G_OBJECT (target), pspec->name, &v);
309 gst_object_unref (target);
313 GST_CAT_ERROR (GST_CAT_PIPELINE, "could not set property \"%s\" in element \"%s\"",
314 pspec->name, GST_ELEMENT_NAME (target));
319 gst_parse_free_delayed_set (DelayedSet *set) {
321 g_free(set->value_str);
322 g_slice_free(DelayedSet, set);
326 gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph)
331 GstObject *target = NULL;
334 /* do nothing if assignment is for missing element */
338 /* parse the string, so the property name is null-terminated an pos points
339 to the beginning of the value */
340 while (!g_ascii_isspace (*pos) && (*pos != '=')) pos++;
346 while (g_ascii_isspace (*pos)) pos++;
349 while (g_ascii_isspace (*pos)) pos++;
352 pos[strlen (pos) - 1] = '\0';
354 gst_parse_unescape (pos);
356 if (gst_child_proxy_lookup (GST_OBJECT (element), value, &target, &pspec)) {
357 gboolean got_value = FALSE;
359 value_type = G_PARAM_SPEC_VALUE_TYPE (pspec);
361 GST_CAT_LOG (GST_CAT_PIPELINE, "parsing property %s as a %s", pspec->name,
362 g_type_name (value_type));
363 g_value_init (&v, value_type);
364 if (gst_value_deserialize (&v, pos))
366 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
369 bin = gst_parse_bin_from_description (pos, TRUE, NULL);
371 g_value_set_object (&v, bin);
377 g_object_set_property (G_OBJECT (target), pspec->name, &v);
379 /* do a delayed set */
380 if (GST_IS_CHILD_PROXY (element)) {
381 DelayedSet *data = g_slice_new0 (DelayedSet);
383 data->parent = element;
384 data->name = g_strdup(value);
385 data->value_str = g_strdup(pos);
386 data->signal_id = g_signal_connect_data(element, "child-added",
387 G_CALLBACK (gst_parse_new_child), data, (GClosureNotify)
388 gst_parse_free_delayed_set, (GConnectFlags) 0);
391 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \
392 _("no property \"%s\" in element \"%s\""), value, \
393 GST_ELEMENT_NAME (element));
398 gst_parse_strfree (value);
402 gst_object_unref (target);
406 SET_ERROR (graph->error, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY,
407 _("could not set property \"%s\" in element \"%s\" to \"%s\""),
408 value, GST_ELEMENT_NAME (element), pos);
412 gst_parse_free_link (link_t *link)
414 gst_parse_strfree (link->src_name);
415 gst_parse_strfree (link->sink_name);
416 g_slist_foreach (link->src_pads, (GFunc) gst_parse_strfree, NULL);
417 g_slist_foreach (link->sink_pads, (GFunc) gst_parse_strfree, NULL);
418 g_slist_free (link->src_pads);
419 g_slist_free (link->sink_pads);
420 if (link->caps) gst_caps_unref (link->caps);
421 gst_parse_link_free (link);
425 gst_parse_free_delayed_link (DelayedLink *link)
427 g_free (link->src_pad);
428 g_free (link->sink_pad);
429 if (link->caps) gst_caps_unref (link->caps);
430 g_slice_free (DelayedLink, link);
434 gst_parse_found_pad (GstElement *src, GstPad *pad, gpointer data)
436 DelayedLink *link = data;
438 GST_CAT_INFO (GST_CAT_PIPELINE, "trying delayed linking %s:%s to %s:%s",
439 GST_STR_NULL (GST_ELEMENT_NAME (src)), GST_STR_NULL (link->src_pad),
440 GST_STR_NULL (GST_ELEMENT_NAME (link->sink)), GST_STR_NULL (link->sink_pad));
442 if (gst_element_link_pads_filtered (src, link->src_pad, link->sink,
443 link->sink_pad, link->caps)) {
444 /* do this here, we don't want to get any problems later on when
445 * unlocking states */
446 GST_CAT_DEBUG (GST_CAT_PIPELINE, "delayed linking %s:%s to %s:%s worked",
447 GST_STR_NULL (GST_ELEMENT_NAME (src)), GST_STR_NULL (link->src_pad),
448 GST_STR_NULL (GST_ELEMENT_NAME (link->sink)), GST_STR_NULL (link->sink_pad));
449 g_signal_handler_disconnect (src, link->signal_id);
452 /* both padnames and the caps may be NULL */
454 gst_parse_perform_delayed_link (GstElement *src, const gchar *src_pad,
455 GstElement *sink, const gchar *sink_pad,
458 GList *templs = gst_element_class_get_pad_template_list (
459 GST_ELEMENT_GET_CLASS (src));
461 for (; templs; templs = templs->next) {
462 GstPadTemplate *templ = (GstPadTemplate *) templs->data;
463 if ((GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) &&
464 (GST_PAD_TEMPLATE_PRESENCE(templ) == GST_PAD_SOMETIMES))
466 DelayedLink *data = g_slice_new (DelayedLink);
468 /* TODO: maybe we should check if src_pad matches this template's names */
470 GST_CAT_DEBUG (GST_CAT_PIPELINE, "trying delayed link %s:%s to %s:%s",
471 GST_STR_NULL (GST_ELEMENT_NAME (src)), GST_STR_NULL (src_pad),
472 GST_STR_NULL (GST_ELEMENT_NAME (sink)), GST_STR_NULL (sink_pad));
474 data->src_pad = g_strdup (src_pad);
476 data->sink_pad = g_strdup (sink_pad);
478 data->caps = gst_caps_copy (caps);
482 data->signal_id = g_signal_connect_data (src, "pad-added",
483 G_CALLBACK (gst_parse_found_pad), data,
484 (GClosureNotify) gst_parse_free_delayed_link, (GConnectFlags) 0);
491 * performs a link and frees the struct. src and sink elements must be given
492 * return values 0 - link performed
497 gst_parse_perform_link (link_t *link, graph_t *graph)
499 GstElement *src = link->src;
500 GstElement *sink = link->sink;
501 GSList *srcs = link->src_pads;
502 GSList *sinks = link->sink_pads;
503 g_assert (GST_IS_ELEMENT (src));
504 g_assert (GST_IS_ELEMENT (sink));
506 GST_CAT_INFO (GST_CAT_PIPELINE,
507 "linking %s:%s to %s:%s (%u/%u) with caps \"%" GST_PTR_FORMAT "\"",
508 GST_ELEMENT_NAME (src), link->src_name ? link->src_name : "(any)",
509 GST_ELEMENT_NAME (sink), link->sink_name ? link->sink_name : "(any)",
510 g_slist_length (srcs), g_slist_length (sinks), link->caps);
512 if (!srcs || !sinks) {
513 if (gst_element_link_pads_filtered (src,
514 srcs ? (const gchar *) srcs->data : NULL, sink,
515 sinks ? (const gchar *) sinks->data : NULL, link->caps)) {
518 if (gst_parse_perform_delayed_link (src,
519 srcs ? (const gchar *) srcs->data : NULL,
520 sink, sinks ? (const gchar *) sinks->data : NULL, link->caps)) {
527 if (g_slist_length (link->src_pads) != g_slist_length (link->src_pads)) {
530 while (srcs && sinks) {
531 const gchar *src_pad = (const gchar *) srcs->data;
532 const gchar *sink_pad = (const gchar *) sinks->data;
533 srcs = g_slist_next (srcs);
534 sinks = g_slist_next (sinks);
535 if (gst_element_link_pads_filtered (src, src_pad, sink, sink_pad,
539 if (gst_parse_perform_delayed_link (src, src_pad,
550 gst_parse_free_link (link);
554 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
555 _("could not link %s to %s"), GST_ELEMENT_NAME (src),
556 GST_ELEMENT_NAME (sink));
557 gst_parse_free_link (link);
562 static int yyerror (void *scanner, graph_t *graph, const char *s);
575 %token <s> IDENTIFIER
576 %left <s> REF PADREF BINREF
577 %token <s> ASSIGNMENT
583 %type <l> linkpart link
586 %type <p> padlist pads assignments
593 %parse-param { void *scanner }
594 %parse-param { graph_t *graph }
600 element: IDENTIFIER { $$ = gst_element_factory_make ($1, NULL);
602 ADD_MISSING_ELEMENT (graph, $1);
603 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), $1);
604 /* if FATAL_ERRORS flag is set, we don't have to worry about backwards
605 * compatibility and can continue parsing and check for other missing
607 if ((graph->flags & GST_PARSE_FLAG_FATAL_ERRORS) == 0) {
608 gst_parse_strfree ($1);
612 gst_parse_strfree ($1);
614 | element ASSIGNMENT { gst_parse_element_set ($2, $1, graph);
618 assignments: /* NOP */ { $$ = NULL; }
619 | assignments ASSIGNMENT { $$ = g_slist_prepend ($1, $2); }
621 bin: '(' assignments chain ')' { GST_BIN_MAKE ($$, "bin", $3, $2, FALSE); }
622 | BINREF assignments chain ')' { GST_BIN_MAKE ($$, $1, $3, $2, TRUE);
623 gst_parse_strfree ($1);
625 | BINREF assignments ')' { GST_BIN_MAKE ($$, $1, NULL, $2, TRUE);
626 gst_parse_strfree ($1);
628 | BINREF assignments error ')' { GST_BIN_MAKE ($$, $1, NULL, $2, TRUE);
629 gst_parse_strfree ($1);
633 pads: PADREF { $$ = g_slist_prepend (NULL, $1); }
634 | PADREF padlist { $$ = $2;
635 $$ = g_slist_prepend ($$, $1);
638 padlist: ',' IDENTIFIER { $$ = g_slist_prepend (NULL, $2); }
639 | ',' IDENTIFIER padlist { $$ = g_slist_prepend ($3, $2); }
642 reference: REF { MAKE_REF ($$, $1, NULL); }
643 | REF padlist { MAKE_REF ($$, $1, $2); }
646 linkpart: reference { $$ = $1; }
647 | pads { MAKE_REF ($$, NULL, $1); }
648 | /* NOP */ { MAKE_REF ($$, NULL, NULL); }
651 link: linkpart LINK linkpart { $$ = $1;
653 $$->caps = gst_caps_from_string ($2);
654 if ($$->caps == NULL)
655 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $2);
656 gst_parse_strfree ($2);
658 $$->sink_name = $3->src_name;
659 $$->sink_pads = $3->src_pads;
660 gst_parse_link_free ($3);
664 linklist: link { $$ = g_slist_prepend (NULL, $1); }
665 | link linklist { $$ = g_slist_prepend ($2, $1); }
666 | linklist error { $$ = $1; }
669 chain: element { $$ = gst_parse_chain_new ();
670 $$->first = $$->last = $1;
671 $$->front = $$->back = NULL;
672 $$->elements = g_slist_prepend (NULL, $1);
675 | chain chain { if ($1->back && $2->front) {
676 if (!$1->back->sink_name) {
677 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without source element"));
678 gst_parse_free_link ($1->back);
680 graph->links = g_slist_prepend (graph->links, $1->back);
682 if (!$2->front->src_name) {
683 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
684 gst_parse_free_link ($2->front);
686 graph->links = g_slist_prepend (graph->links, $2->front);
689 } else if ($1->back) {
690 if (!$1->back->sink_name) {
691 $1->back->sink = $2->first;
693 } else if ($2->front) {
694 if (!$2->front->src_name) {
695 $2->front->src = $1->last;
697 $1->back = $2->front;
701 graph->links = g_slist_prepend (graph->links, $1->back);
705 $1->elements = g_slist_concat ($1->elements, $2->elements);
707 gst_parse_chain_free ($2);
710 | chain linklist { GSList *walk;
712 $2 = g_slist_prepend ($2, $1->back);
715 if (!((link_t *) $2->data)->src_name) {
716 ((link_t *) $2->data)->src = $1->last;
719 for (walk = $2; walk; walk = walk->next) {
720 link_t *link = (link_t *) walk->data;
721 if (!link->sink_name && walk->next) {
722 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
723 gst_parse_free_link (link);
724 } else if (!link->src_name && !link->src) {
725 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without source element"));
726 gst_parse_free_link (link);
729 graph->links = g_slist_prepend (graph->links, link);
738 | chain error { $$ = $1; }
739 | link chain { if ($2->front) {
740 if (!$2->front->src_name) {
741 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without source element"));
742 gst_parse_free_link ($2->front);
744 graph->links = g_slist_prepend (graph->links, $2->front);
747 if (!$1->sink_name) {
748 $1->sink = $2->first;
753 | PARSE_URL chain { $$ = $2;
755 GstElement *element =
756 gst_element_make_from_uri (GST_URI_SRC, $1, NULL);
758 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
759 _("no source element for URI \"%s\""), $1);
761 $$->front->src = element;
762 graph->links = g_slist_prepend (
763 graph->links, $$->front);
765 $$->elements = g_slist_prepend ($$->elements, element);
768 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
769 _("no element to link URI \"%s\" to"), $1);
773 | link PARSE_URL { GstElement *element =
774 gst_element_make_from_uri (GST_URI_SINK, $2, NULL);
776 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
777 _("no sink element for URI \"%s\""), $2);
778 gst_parse_link_free ($1);
781 } else if ($1->sink_name || $1->sink_pads) {
782 gst_object_unref (element);
783 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
784 _("could not link sink element for URI \"%s\""), $2);
785 gst_parse_link_free ($1);
789 $$ = gst_parse_chain_new ();
790 $$->first = $$->last = element;
792 $$->front->sink = element;
793 $$->elements = g_slist_prepend (NULL, element);
798 graph: /* NOP */ { SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY, _("empty pipeline not allowed"));
801 | chain { $$ = graph;
803 if (!$1->front->src_name) {
804 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without source element"));
805 gst_parse_free_link ($1->front);
807 $$->links = g_slist_prepend ($$->links, $1->front);
812 if (!$1->back->sink_name) {
813 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
814 gst_parse_free_link ($1->back);
816 $$->links = g_slist_prepend ($$->links, $1->back);
828 yyerror (void *scanner, graph_t *graph, const char *s)
830 /* FIXME: This should go into the GError somehow, but how? */
831 GST_WARNING ("Error during parsing: %s", s);
837 _gst_parse_launch (const gchar *str, GError **error, GstParseContext *ctx,
847 g_return_val_if_fail (str != NULL, NULL);
848 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
856 #ifdef __GST_PARSE_TRACE
857 GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled");
858 __strings = __chains = __links = 0;
859 #endif /* __GST_PARSE_TRACE */
861 dstr = g_strdup (str);
862 _gst_parse_yylex_init (&scanner);
863 _gst_parse_yy_scan_string (dstr, scanner);
869 if (yyparse (scanner, &g) != 0) {
870 SET_ERROR (error, GST_PARSE_ERROR_SYNTAX,
871 "Unrecoverable syntax error while parsing pipeline %s", str);
873 _gst_parse_yylex_destroy (scanner);
878 _gst_parse_yylex_destroy (scanner);
881 GST_CAT_DEBUG (GST_CAT_PIPELINE, "got %u elements and %u links",
882 g.chain ? g_slist_length (g.chain->elements) : 0,
883 g_slist_length (g.links));
887 } else if (!g.chain->elements->next) {
888 /* only one toplevel element */
889 ret = (GstElement *) g.chain->elements->data;
890 g_slist_free (g.chain->elements);
891 if (GST_IS_BIN (ret))
893 gst_parse_chain_free (g.chain);
895 /* put all elements in our bin */
896 bin = GST_BIN (gst_element_factory_make ("pipeline", NULL));
899 for (walk = g.chain->elements; walk; walk = walk->next) {
900 if (walk->data != NULL)
901 gst_bin_add (bin, GST_ELEMENT (walk->data));
904 g_slist_free (g.chain->elements);
905 ret = GST_ELEMENT (bin);
906 gst_parse_chain_free (g.chain);
910 for (walk = g.links; walk; walk = walk->next) {
911 link_t *l = (link_t *) walk->data;
915 l->src = gst_bin_get_by_name_recurse_up (bin, l->src_name);
917 gst_object_unref (l->src);
919 l->src = strcmp (GST_ELEMENT_NAME (ret), l->src_name) == 0 ? ret : NULL;
924 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
925 "No element named \"%s\" - omitting link", l->src_name);
927 /* probably a missing element which we've handled already */
929 gst_parse_free_link (l);
936 l->sink = gst_bin_get_by_name_recurse_up (bin, l->sink_name);
938 gst_object_unref (l->sink);
940 l->sink = strcmp (GST_ELEMENT_NAME (ret), l->sink_name) == 0 ? ret : NULL;
945 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
946 "No element named \"%s\" - omitting link", l->sink_name);
948 /* probably a missing element which we've handled already */
950 gst_parse_free_link (l);
954 gst_parse_perform_link (l, &g);
956 g_slist_free (g.links);
959 #ifdef __GST_PARSE_TRACE
960 GST_CAT_DEBUG (GST_CAT_PIPELINE,
961 "TRACE: %u strings, %u chains and %u links left", __strings, __chains,
963 if (__strings || __chains || __links) {
964 g_warning ("TRACE: %u strings, %u chains and %u links left", __strings,
967 #endif /* __GST_PARSE_TRACE */
973 g_slist_foreach (g.chain->elements, (GFunc)gst_object_unref, NULL);
974 g_slist_free (g.chain->elements);
975 gst_parse_chain_free (g.chain);
978 g_slist_foreach (g.links, (GFunc)gst_parse_free_link, NULL);
979 g_slist_free (g.links);