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
30 #define YYENABLE_NLS 0
32 #ifndef YYLTYPE_IS_TRIVIAL
33 #define YYLTYPE_IS_TRIVIAL 0
36 /*******************************************************************************************
37 *** Tracing memory leaks
38 *******************************************************************************************/
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 (void)
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 (void)
86 ret = g_slice_new0 (chain_t);
87 /* g_print ("@%p: ALLOCATED CHAIN (%3u):\n", ret, __chains); */
91 __gst_parse_chain_free (chain_t *data)
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);
99 #endif /* __GST_PARSE_TRACE */
101 /*******************************************************************************************
102 *** define SET_ERROR macro/function
103 *******************************************************************************************/
104 #ifdef G_HAVE_ISO_VARARGS
106 # define SET_ERROR(error, type, ...) \
108 GST_CAT_ERROR (GST_CAT_PIPELINE, __VA_ARGS__); \
109 if ((error) && !*(error)) { \
110 g_set_error ((error), GST_PARSE_ERROR, (type), __VA_ARGS__); \
114 #elif defined(G_HAVE_GNUC_VARARGS)
116 # define SET_ERROR(error, type, args...) \
118 GST_CAT_ERROR (GST_CAT_PIPELINE, args ); \
119 if ((error) && !*(error)) { \
120 g_set_error ((error), GST_PARSE_ERROR, (type), args ); \
127 SET_ERROR (GError **error, gint type, const char *format, ...)
131 g_warning ("error while parsing");
136 va_start (varargs, format);
137 string = g_strdup_vprintf (format, varargs);
140 g_set_error (error, GST_PARSE_ERROR, type, string);
147 #endif /* G_HAVE_ISO_VARARGS */
149 /*** define YYPRINTF macro/function if we're debugging */
151 /* bison 1.35 calls this macro with side effects, we need to make sure the
152 side effects work - crappy bison */
154 #ifndef GST_DISABLE_GST_DEBUG
157 # ifdef G_HAVE_ISO_VARARGS
159 /* # define YYFPRINTF(a, ...) GST_CAT_DEBUG (GST_CAT_PIPELINE, __VA_ARGS__) */
160 # define YYFPRINTF(a, ...) \
162 GST_CAT_LOG (GST_CAT_PIPELINE, __VA_ARGS__); \
165 # elif defined(G_HAVE_GNUC_VARARGS)
167 # define YYFPRINTF(a, args...) \
169 GST_CAT_LOG (GST_CAT_PIPELINE, args); \
175 YYPRINTF(const char *format, ...)
180 va_start (varargs, format);
181 temp = g_strdup_vprintf (format, varargs);
182 GST_CAT_LOG (GST_CAT_PIPELINE, "%s", temp);
187 # endif /* G_HAVE_ISO_VARARGS */
189 #endif /* GST_DISABLE_GST_DEBUG */
193 * include headers generated by bison & flex, after defining (or not defining) YYDEBUG
195 #include "grammar.tab.h"
196 #include "parse_lex.h"
198 /*******************************************************************************************
199 *** report missing elements/bins/..
200 *******************************************************************************************/
203 static void add_missing_element(graph_t *graph,gchar *name){
205 (graph)->ctx->missing_elements = g_list_append ((graph)->ctx->missing_elements, g_strdup (name));
210 /*******************************************************************************************
211 *** helpers for pipeline-setup
212 *******************************************************************************************/
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 : "", \
224 gst_parse_free_link (l); \
226 graph->links = g_slist_append (graph->links, l ); \
235 gulong pad_added_signal_id, no_more_pads_signal_id;
245 static int gst_resolve_reference(reference_t *rr, GstElement *pipeline){
248 if(rr->element) return 0; /* already resolved! */
249 if(!rr->name) return -2; /* no chance! */
251 if (GST_IS_BIN (pipeline)){
252 bin = GST_BIN (pipeline);
253 rr->element = gst_bin_get_by_name_recurse_up (bin, rr->name);
255 rr->element = strcmp (GST_ELEMENT_NAME (pipeline), rr->name) == 0 ?
256 gst_object_ref(pipeline) : NULL;
258 if(rr->element) return 0; /* resolved */
259 else return -1; /* not found */
262 static void gst_parse_free_delayed_set (DelayedSet *set)
265 g_free(set->value_str);
266 g_slice_free(DelayedSet, set);
269 static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object,
270 const gchar * name, gpointer data);
272 static void gst_parse_add_delayed_set (GstElement *element, gchar *name, gchar *value_str)
274 DelayedSet *data = g_slice_new0 (DelayedSet);
276 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "delaying property set %s to %s",
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);
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;
290 current = names = g_strsplit (name, "::", -1);
291 parent = gst_bin_get_by_name (GST_BIN_CAST (element), current[0]);
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]);
298 gst_parse_add_delayed_set(parent, sub_name, value_str);
301 gst_object_unref (parent);
306 gst_object_unref (parent);
311 static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object,
312 const gchar * name, gpointer data)
314 DelayedSet *set = (DelayedSet *) data;
317 GObject *target = NULL;
320 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, child_proxy, "new child %s, checking property %s",
323 if (gst_child_proxy_lookup (child_proxy, set->name, &target, &pspec)) {
324 gboolean got_value = FALSE;
326 value_type = pspec->value_type;
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))
333 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
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);
339 g_value_set_object (&v, bin);
343 g_signal_handler_disconnect (child_proxy, set->signal_id);
346 g_object_set_property (target, pspec->name, &v);
348 const gchar *obj_name = GST_OBJECT_NAME(object);
349 gint len = strlen (obj_name);
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);
361 g_object_unref (target);
365 GST_CAT_ERROR (GST_CAT_PIPELINE, "could not set property \"%s\" in %"
366 GST_PTR_FORMAT, pspec->name, target);
370 static void gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph)
372 GParamSpec *pspec = NULL;
375 GObject *target = NULL;
378 /* do nothing if assignment is for missing element */
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++;
390 while (g_ascii_isspace (*pos)) 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] == '"') {
397 pos[strlen (pos) - 1] = '\0';
399 gst_parse_unescape (pos);
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);
407 pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element), value);
409 target = g_object_ref (element);
410 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, target, "found %s property", value);
412 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \
413 _("no property \"%s\" in element \"%s\""), value, \
414 GST_ELEMENT_NAME (element));
418 if (pspec != NULL && target != NULL) {
419 gboolean got_value = FALSE;
421 value_type = pspec->value_type;
423 GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "parsing property %s as a %s",
424 pspec->name, g_type_name (value_type));
426 g_value_init (&v, value_type);
427 if (gst_value_deserialize (&v, pos))
429 else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) {
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);
435 g_value_set_object (&v, bin);
441 g_object_set_property (target, pspec->name, &v);
445 gst_parse_strfree (value);
449 g_object_unref (target);
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);
459 static void gst_parse_free_reference (reference_t *rr)
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);
467 static void gst_parse_free_link (link_t *link)
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);
475 static void gst_parse_free_chain (chain_t *ch)
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);
486 static void gst_parse_free_delayed_link (DelayedLink *link)
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);
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))
499 static void gst_parse_no_more_pads (GstElement *src, gpointer data)
501 DelayedLink *link = data;
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)));
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 */
516 static void gst_parse_found_pad (GstElement *src, GstPad *pad, gpointer data)
518 DelayedLink *link = data;
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));
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' */
538 g_signal_handler_disconnect (src, link->pad_added_signal_id);
542 /* both padnames and the caps may be NULL */
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)
548 GList *templs = gst_element_class_get_pad_template_list (
549 GST_ELEMENT_GET_CLASS (src));
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))
556 DelayedLink *data = g_slice_new (DelayedLink);
558 data->all_pads = all_pads;
560 /* TODO: maybe we should check if src_pad matches this template's names */
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));
567 data->src_pad = g_strdup (src_pad);
569 data->sink_pad = g_strdup (sink_pad);
571 data->caps = gst_caps_copy (caps);
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);
587 gst_parse_element_can_do_caps (GstElement * e, GstPadDirection dir,
590 gboolean can_do = FALSE;
595 pads = (dir == GST_PAD_SRC) ? e->srcpads : e->sinkpads;
597 while (!can_do && pads != NULL) {
598 GstPad *pad = pads->data;
601 caps = gst_pad_get_current_caps (pad);
603 caps = gst_pad_query_caps (pad, NULL);
605 can_do = gst_caps_can_intersect (caps, link_caps);
607 GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT,
608 can_do, caps, link_caps);
610 gst_caps_unref (caps);
615 GST_OBJECT_UNLOCK (e);
621 * performs a link and frees the struct. src and sink elements must be given
622 * return values 0 - link performed
627 gst_parse_perform_link (link_t *link, graph_t *graph)
629 GstElement *src = link->src.element;
630 GstElement *sink = link->sink.element;
631 GSList *srcs = link->src.pads;
632 GSList *sinks = link->sink.pads;
633 g_assert (GST_IS_ELEMENT (src));
634 g_assert (GST_IS_ELEMENT (sink));
636 GST_CAT_INFO (GST_CAT_PIPELINE,
637 "linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " (%u/%u) with caps \"%" GST_PTR_FORMAT "\"",
638 PRETTY_PAD_NAME_ARGS (src, link->src.name),
639 PRETTY_PAD_NAME_ARGS (sink, link->sink.name),
640 g_slist_length (srcs), g_slist_length (sinks), link->caps);
642 if (!srcs || !sinks) {
643 gboolean found_one = gst_element_link_pads_filtered (src,
644 srcs ? (const gchar *) srcs->data : NULL, sink,
645 sinks ? (const gchar *) sinks->data : NULL, link->caps);
649 goto success; /* Linked one, and not an all-pads link = we're done */
651 /* Try and link more available pads */
652 while (gst_element_link_pads_filtered (src,
653 srcs ? (const gchar *) srcs->data : NULL, sink,
654 sinks ? (const gchar *) sinks->data : NULL, link->caps));
657 /* We either didn't find any static pads, or this is a all-pads link,
658 * in which case watch for future pads and link those. Not a failure
659 * in the all-pads case if there's no sometimes pads to watch */
660 if (gst_parse_perform_delayed_link (src,
661 srcs ? (const gchar *) srcs->data : NULL,
662 sink, sinks ? (const gchar *) sinks->data : NULL, link->caps,
663 link->all_pads) || link->all_pads) {
669 if (g_slist_length (link->src.pads) != g_slist_length (link->sink.pads)) {
672 while (srcs && sinks) {
673 const gchar *src_pad = (const gchar *) srcs->data;
674 const gchar *sink_pad = (const gchar *) sinks->data;
675 srcs = g_slist_next (srcs);
676 sinks = g_slist_next (sinks);
677 if (gst_element_link_pads_filtered (src, src_pad, sink, sink_pad,
681 if (gst_parse_perform_delayed_link (src, src_pad,
683 link->caps, link->all_pads)) {
692 gst_parse_free_link (link);
696 if (link->caps != NULL) {
697 gboolean src_can_do_caps, sink_can_do_caps;
698 gchar *caps_str = gst_caps_to_string (link->caps);
701 gst_parse_element_can_do_caps (src, GST_PAD_SRC, link->caps);
703 gst_parse_element_can_do_caps (sink, GST_PAD_SINK, link->caps);
705 if (!src_can_do_caps && sink_can_do_caps) {
706 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
707 _("could not link %s to %s, %s can't handle caps %s"),
708 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
709 GST_ELEMENT_NAME (src), caps_str);
710 } else if (src_can_do_caps && !sink_can_do_caps) {
711 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
712 _("could not link %s to %s, %s can't handle caps %s"),
713 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
714 GST_ELEMENT_NAME (sink), caps_str);
715 } else if (!src_can_do_caps && !sink_can_do_caps) {
716 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
717 _("could not link %s to %s, neither element can handle caps %s"),
718 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
720 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
721 _("could not link %s to %s with caps %s"),
722 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
726 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
727 _("could not link %s to %s"), GST_ELEMENT_NAME (src),
728 GST_ELEMENT_NAME (sink));
730 gst_parse_free_link (link);
735 static int yyerror (void *scanner, graph_t *graph, const char *s);
748 /* No grammar ambiguities expected, FAIL otherwise */
751 %token <ss> PARSE_URL
752 %token <ss> IDENTIFIER
753 %left <ss> REF PADREF BINREF
754 %token <ss> ASSIGNMENT
760 %type <cc> chain bin chainlist openchain elementary
764 %type <pp> morepads pads assignments
766 %destructor { gst_parse_strfree ($$); } <ss>
768 gst_parse_free_chain($$); } <cc>
769 %destructor { gst_parse_free_link ($$); } <ll>
770 %destructor { gst_parse_free_reference(&($$));} <rr>
771 %destructor { gst_object_unref ($$); } <ee>
772 %destructor { GSList *walk;
773 for(walk=$$;walk;walk=walk->next)
774 gst_parse_strfree (walk->data);
775 g_slist_free ($$); } <pp>
784 %lex-param { void *scanner }
785 %parse-param { void *scanner }
786 %parse-param { graph_t *graph }
792 /*************************************************************
793 * Grammar explanation:
794 * _element_s are specified by an identifier of their type.
795 * a name can be give in the optional property-assignments
798 * identity silence=false name=frodo
800 **************************************************************/
801 element: IDENTIFIER { $$ = gst_element_factory_make ($1, NULL);
803 add_missing_element(graph, $1);
804 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), $1);
806 gst_parse_strfree ($1);
808 | element ASSIGNMENT { gst_parse_element_set ($2, $1, graph);
813 /*************************************************************
814 * Grammar explanation: (cont'd)
815 * a graph has (pure) _element_s, _bin_s and _link_s.
816 * since bins are special elements, bins and elements can
817 * be generalized as _elementary_.
818 * The construction of _bin_s will be discussed later.
821 **************************************************************/
823 element { $$ = gst_parse_chain_new ();
824 /* g_print ("@%p: CHAINing elementary\n", $$); */
825 $$->first.element = $1? gst_object_ref($1) : NULL;
826 $$->last.element = $1? gst_object_ref($1) : NULL;
827 $$->first.name = $$->last.name = NULL;
828 $$->first.pads = $$->last.pads = NULL;
829 $$->elements = $1 ? g_slist_prepend (NULL, $1) : NULL;
834 /*************************************************************
835 * Grammar explanation: (cont'd)
836 * a _chain_ is a list of _elementary_s that have _link_s inbetween
837 * which are represented through infix-notation.
839 * fakesrc ! sometransformation ! fakesink
841 * every _link_ can be augmented with _pads_.
843 * coffeesrc .sound ! speakersink
844 * multisrc .movie,ads ! .projector,smallscreen multisink
846 * and every _link_ can be setup to filter media-types
847 * mediasrc ! audio/x-raw, signed=TRUE ! stereosink
850 * if the lexer does not recognize your media-type it
851 * will make it an element name. that results in errors
853 * NO SUCH ELEMENT: no element audio7x-raw
854 * '7' vs. '/' in https://en.wikipedia.org/wiki/QWERTZ
857 * in the parser we need to differ between chains that can
858 * be extended by more elementaries (_openchain_) and others
859 * that are syntactically closed (handled later in this file).
860 * (e.g. fakesrc ! sinkreferencename.padname)
861 **************************************************************/
862 chain: openchain { $$=$1;
864 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX,
865 _("unexpected reference \"%s\" - ignoring"), $$->last.name);
866 gst_parse_strfree($$->last.name);
870 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX,
871 _("unexpected pad-reference \"%s\" - ignoring"), (gchar*)$$->last.pads->data);
872 g_slist_foreach ($$->last.pads, (GFunc) gst_parse_strfree, NULL);
873 g_slist_free ($$->last.pads);
880 elementary pads { $$=$1;
881 $$->last.pads = g_slist_concat ($$->last.pads, $2);
882 /* g_print ("@%p@%p: FKI elementary pads\n", $1, $$->last.pads); */
884 | openchain link pads elementary pads
887 $2->sink = $4->first;
888 $2->sink.pads = g_slist_concat ($3, $2->sink.pads);
890 $4->first = $1->first;
891 $4->elements = g_slist_concat ($1->elements, $4->elements);
892 gst_parse_chain_free($1);
894 $$->last.pads = g_slist_concat ($$->last.pads, $5);
898 link: LINK { $$ = gst_parse_link_new ();
899 $$->all_pads = FALSE;
901 $$->caps = gst_caps_from_string ($1);
902 if ($$->caps == NULL)
903 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1);
904 gst_parse_strfree ($1);
907 | LINK_ALL { $$ = gst_parse_link_new ();
910 $$->caps = gst_caps_from_string ($1);
911 if ($$->caps == NULL)
912 SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1);
913 gst_parse_strfree ($1);
917 pads: /* NOP */ { $$ = NULL; }
918 | PADREF morepads { $$ = $2;
919 $$ = g_slist_prepend ($$, $1);
922 morepads: /* NOP */ { $$ = NULL; }
923 | ',' IDENTIFIER morepads { $$ = g_slist_prepend ($3, $2); }
926 /*************************************************************
927 * Grammar explanation: (cont'd)
928 * the first and last elements of a _chain_ can be give
929 * as URL. This creates special elements that fit the URL.
931 * fakesrc ! http://fake-sink.org
932 * http://somesource.org ! fakesink
933 **************************************************************/
935 chain: openchain link PARSE_URL { GstElement *element =
936 gst_element_make_from_uri (GST_URI_SINK, $3, NULL, NULL);
937 /* FIXME: get and parse error properly */
939 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
940 _("no sink element for URI \"%s\""), $3);
943 $2->sink.element = element?gst_object_ref(element):NULL;
946 $$->last.element = NULL;
947 $$->last.name = NULL;
948 $$->last.pads = NULL;
949 if(element) $$->elements = g_slist_append ($$->elements, element);
954 PARSE_URL { GstElement *element =
955 gst_element_make_from_uri (GST_URI_SRC, $1, NULL, NULL);
956 /* FIXME: get and parse error properly */
958 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
959 _("no source element for URI \"%s\""), $1);
961 $$ = gst_parse_chain_new ();
962 /* g_print ("@%p: CHAINing srcURL\n", $$); */
963 $$->first.element = NULL;
964 $$->first.name = NULL;
965 $$->first.pads = NULL;
966 $$->last.element = element ? gst_object_ref(element):NULL;
967 $$->last.name = NULL;
968 $$->last.pads = NULL;
969 $$->elements = element ? g_slist_prepend (NULL, element) : NULL;
975 /*************************************************************
976 * Grammar explanation: (cont'd)
977 * the first and last elements of a _chain_ can be linked
978 * to a named _reference_ (with optional pads).
980 * fakesrc ! nameOfSinkElement.
981 * fakesrc ! nameOfSinkElement.Padname
982 * fakesrc ! nameOfSinkElement.Padname, anotherPad
983 * nameOfSource.Padname ! fakesink
984 **************************************************************/
986 chain: openchain link reference { $$ = $1;
990 $$->last.element = NULL;
991 $$->last.name = NULL;
992 $$->last.pads = NULL;
998 reference { $$ = gst_parse_chain_new ();
1000 $$->first.element = NULL;
1001 $$->first.name = NULL;
1002 $$->first.pads = NULL;
1003 $$->elements = NULL;
1006 reference: REF morepads {
1007 gchar *padname = $1;
1010 while (*padname != '.') padname++;
1013 if (*padname != '\0')
1014 pads = g_slist_prepend (pads, gst_parse_strdup (padname));
1023 /*************************************************************
1024 * Grammar explanation: (cont'd)
1025 * a _chainlist_ is just a list of _chain_s.
1027 * You can specify _link_s with named
1028 * _reference_ on each side. That
1029 * works already after the explanations above.
1030 * someSourceName.Pad ! someSinkName.
1031 * someSourceName.Pad,anotherPad ! someSinkName.Apad,Bpad
1033 * If a syntax error occurs, the already finished _chain_s
1034 * and _links_ are kept intact.
1035 *************************************************************/
1037 chainlist: /* NOP */ { $$ = NULL; }
1038 | chainlist chain { if ($1){
1039 gst_parse_free_reference(&($1->last));
1040 gst_parse_free_reference(&($2->first));
1041 $2->first = $1->first;
1042 $2->elements = g_slist_concat ($1->elements, $2->elements);
1043 gst_parse_chain_free ($1);
1047 | chainlist error { $$=$1;
1048 GST_CAT_DEBUG (GST_CAT_PIPELINE,"trying to recover from syntax error");
1049 SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX, _("syntax error"));
1053 /*************************************************************
1054 * Grammar explanation: (cont'd)
1056 *************************************************************/
1059 assignments: /* NOP */ { $$ = NULL; }
1060 | ASSIGNMENT assignments { $$ = g_slist_prepend ($2, $1); }
1063 binopener: '(' { $$ = gst_parse_strdup(_("bin")); }
1064 | BINREF { $$ = $1; }
1066 bin: binopener assignments chainlist ')' {
1067 chain_t *chain = $3;
1069 GstBin *bin = (GstBin *) gst_element_factory_make ($1, NULL);
1071 SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY_BIN,
1072 _("specified empty bin \"%s\", not allowed"), $1);
1073 chain = gst_parse_chain_new ();
1074 chain->first.element = chain->last.element = NULL;
1075 chain->first.name = chain->last.name = NULL;
1076 chain->first.pads = chain->last.pads = NULL;
1077 chain->elements = NULL;
1080 add_missing_element(graph, $1);
1081 SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1082 _("no bin \"%s\", unpacking elements"), $1);
1083 /* clear property-list */
1084 g_slist_foreach ($2, (GFunc) gst_parse_strfree, NULL);
1088 for (walk = chain->elements; walk; walk = walk->next )
1089 gst_bin_add (bin, GST_ELEMENT (walk->data));
1090 g_slist_free (chain->elements);
1091 chain->elements = g_slist_prepend (NULL, bin);
1094 /* set the properties now
1095 * HINT: property-list cleared above, if bin==NULL
1097 for (walk = $2; walk; walk = walk->next)
1098 gst_parse_element_set ((gchar *) walk->data,
1099 GST_ELEMENT (bin), graph);
1101 gst_parse_strfree ($1);
1105 /*************************************************************
1106 * Grammar explanation: (cont'd)
1108 *************************************************************/
1110 graph: chainlist { $$ = graph;
1113 SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY, _("empty pipeline not allowed"));
1122 yyerror (void *scanner, graph_t *graph, const char *s)
1124 /* FIXME: This should go into the GError somehow, but how? */
1125 GST_WARNING ("Error during parsing: %s", s);
1131 priv_gst_parse_launch (const gchar *str, GError **error, GstParseContext *ctx,
1132 GstParseFlags flags)
1141 g_return_val_if_fail (str != NULL, NULL);
1142 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1150 #ifdef __GST_PARSE_TRACE
1151 GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled");
1152 __strings = __chains = __links = 0;
1153 #endif /* __GST_PARSE_TRACE */
1155 /* g_print("Now scanning: %s\n", str); */
1157 dstr = g_strdup (str);
1158 priv_gst_parse_yylex_init (&scanner);
1159 priv_gst_parse_yy_scan_string (dstr, scanner);
1165 if (yyparse (scanner, &g) != 0) {
1166 SET_ERROR (error, GST_PARSE_ERROR_SYNTAX,
1167 "Unrecoverable syntax error while parsing pipeline %s", str);
1169 priv_gst_parse_yylex_destroy (scanner);
1174 priv_gst_parse_yylex_destroy (scanner);
1177 GST_CAT_DEBUG (GST_CAT_PIPELINE, "got %u elements and %u links",
1178 g.chain ? g_slist_length (g.chain->elements) : 0,
1179 g_slist_length (g.links));
1181 /* ensure chain is not NULL */
1183 g.chain=gst_parse_chain_new ();
1184 g.chain->elements=NULL;
1185 g.chain->first.element=NULL;
1186 g.chain->first.name=NULL;
1187 g.chain->first.pads=NULL;
1188 g.chain->last.element=NULL;
1189 g.chain->last.name=NULL;
1190 g.chain->last.pads=NULL;
1193 /* ensure elements is not empty */
1194 if(!g.chain->elements){
1195 g.chain->elements= g_slist_prepend (NULL, NULL);
1198 /* put all elements in our bin if necessary */
1199 if(g.chain->elements->next){
1200 if (flags & GST_PARSE_FLAG_PLACE_IN_BIN)
1201 bin = GST_BIN (gst_element_factory_make ("bin", NULL));
1203 bin = GST_BIN (gst_element_factory_make ("pipeline", NULL));
1206 for (walk = g.chain->elements; walk; walk = walk->next) {
1207 if (walk->data != NULL)
1208 gst_bin_add (bin, GST_ELEMENT (walk->data));
1210 g_slist_free (g.chain->elements);
1211 g.chain->elements = g_slist_prepend (NULL, bin);
1214 ret = (GstElement *) g.chain->elements->data;
1215 g_slist_free (g.chain->elements);
1216 g.chain->elements=NULL;
1217 if (GST_IS_BIN (ret))
1218 bin = GST_BIN (ret);
1219 gst_parse_free_chain (g.chain);
1223 /* resolve and perform links */
1224 for (walk = g.links; walk; walk = walk->next) {
1225 link_t *l = (link_t *) walk->data;
1227 err=gst_resolve_reference( &(l->src), ret);
1230 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1231 "No src-element named \"%s\" - omitting link", l->src.name);
1233 /* probably a missing element which we've handled already */
1234 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1235 "No src-element found - omitting link");
1237 gst_parse_free_link (l);
1241 err=gst_resolve_reference( &(l->sink), ret);
1244 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1245 "No sink-element named \"%s\" - omitting link", l->src.name);
1247 /* probably a missing element which we've handled already */
1248 SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
1249 "No sink-element found - omitting link");
1251 gst_parse_free_link (l);
1254 gst_parse_perform_link (l, &g);
1256 g_slist_free (g.links);
1259 #ifdef __GST_PARSE_TRACE
1260 GST_CAT_DEBUG (GST_CAT_PIPELINE,
1261 "TRACE: %u strings, %u chains and %u links left", __strings, __chains,
1263 if (__strings || __chains || __links) {
1264 g_warning ("TRACE: %u strings, %u chains and %u links left", __strings,
1267 #endif /* __GST_PARSE_TRACE */
1273 gst_parse_free_chain (g.chain);
1277 g_slist_foreach (g.links, (GFunc)gst_parse_free_link, NULL);
1278 g_slist_free (g.links);