%{ #include "../gst_private.h" #include #include #include #include #include #include "../gst-i18n-lib.h" #include "../gstconfig.h" #include "../gstparse.h" #include "../gstinfo.h" #include "../gsterror.h" #include "../gststructure.h" #include "../gsturi.h" #include "../gstutils.h" #include "../gstvalue.h" #include "../gstchildproxy.h" #include "types.h" /* All error messages in this file are user-visible and need to be translated. * Don't start the message with a capital, and don't end them with a period, * as they will be presented inside a sentence/error. */ #define YYERROR_VERBOSE 1 #define YYENABLE_NLS 0 #ifndef YYLTYPE_IS_TRIVIAL #define YYLTYPE_IS_TRIVIAL 0 #endif /******************************************************************************************* *** Tracing memory leaks *******************************************************************************************/ #ifdef __GST_PARSE_TRACE static guint __strings; static guint __links; static guint __chains; gchar * __gst_parse_strdup (gchar *org) { gchar *ret; __strings++; ret = g_strdup (org); /* g_print ("ALLOCATED STR (%3u): %p %s\n", __strings, ret, ret); */ return ret; } void __gst_parse_strfree (gchar *str) { if (str) { /* g_print ("FREEING STR (%3u): %p %s\n", __strings - 1, str, str); */ g_free (str); g_return_if_fail (__strings > 0); __strings--; } } link_t *__gst_parse_link_new (void) { link_t *ret; __links++; ret = g_slice_new0 (link_t); /* g_print ("ALLOCATED LINK (%3u): %p\n", __links, ret); */ return ret; } void __gst_parse_link_free (link_t *data) { if (data) { /* g_print ("FREEING LINK (%3u): %p\n", __links - 1, data); */ g_slice_free (link_t, data); g_return_if_fail (__links > 0); __links--; } } chain_t * __gst_parse_chain_new (void) { chain_t *ret; __chains++; ret = g_slice_new0 (chain_t); /* g_print ("@%p: ALLOCATED CHAIN (%3u):\n", ret, __chains); */ return ret; } void __gst_parse_chain_free (chain_t *data) { /* g_print ("@%p: FREEING CHAIN (%3u):\n", data, __chains - 1); */ g_slice_free (chain_t, data); g_return_if_fail (__chains > 0); __chains--; } #endif /* __GST_PARSE_TRACE */ /******************************************************************************************* *** define SET_ERROR macro/function *******************************************************************************************/ #ifdef G_HAVE_ISO_VARARGS # define SET_ERROR(error, type, ...) \ G_STMT_START { \ GST_CAT_ERROR (GST_CAT_PIPELINE, __VA_ARGS__); \ if ((error) && !*(error)) { \ g_set_error ((error), GST_PARSE_ERROR, (type), __VA_ARGS__); \ } \ } G_STMT_END #elif defined(G_HAVE_GNUC_VARARGS) # define SET_ERROR(error, type, args...) \ G_STMT_START { \ GST_CAT_ERROR (GST_CAT_PIPELINE, args ); \ if ((error) && !*(error)) { \ g_set_error ((error), GST_PARSE_ERROR, (type), args ); \ } \ } G_STMT_END #else static inline void SET_ERROR (GError **error, gint type, const char *format, ...) { if (error) { if (*error) { g_warning ("error while parsing"); } else { va_list varargs; char *string; va_start (varargs, format); string = g_strdup_vprintf (format, varargs); va_end (varargs); g_set_error (error, GST_PARSE_ERROR, type, string); g_free (string); } } } #endif /* G_HAVE_ISO_VARARGS */ /*** define YYPRINTF macro/function if we're debugging */ /* bison 1.35 calls this macro with side effects, we need to make sure the side effects work - crappy bison */ #ifndef GST_DISABLE_GST_DEBUG # define YYDEBUG 1 # ifdef G_HAVE_ISO_VARARGS /* # define YYFPRINTF(a, ...) GST_CAT_DEBUG (GST_CAT_PIPELINE, __VA_ARGS__) */ # define YYFPRINTF(a, ...) \ G_STMT_START { \ GST_CAT_LOG (GST_CAT_PIPELINE, __VA_ARGS__); \ } G_STMT_END # elif defined(G_HAVE_GNUC_VARARGS) # define YYFPRINTF(a, args...) \ G_STMT_START { \ GST_CAT_LOG (GST_CAT_PIPELINE, args); \ } G_STMT_END # else static inline void YYPRINTF(const char *format, ...) { va_list varargs; gchar *temp; va_start (varargs, format); temp = g_strdup_vprintf (format, varargs); GST_CAT_LOG (GST_CAT_PIPELINE, "%s", temp); g_free (temp); va_end (varargs); } # endif /* G_HAVE_ISO_VARARGS */ #endif /* GST_DISABLE_GST_DEBUG */ /* * include headers generated by bison & flex, after defining (or not defining) YYDEBUG */ #include "grammar.tab.h" #include "parse_lex.h" /******************************************************************************************* *** report missing elements/bins/.. *******************************************************************************************/ static void add_missing_element(graph_t *graph,gchar *name){ if ((graph)->ctx){ (graph)->ctx->missing_elements = g_list_append ((graph)->ctx->missing_elements, g_strdup (name)); } } /******************************************************************************************* *** helpers for pipeline-setup *******************************************************************************************/ #define TRY_SETUP_LINK(l) G_STMT_START { \ if( (!(l)->src.element) && (!(l)->src.name) ){ \ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link has no source [sink=%s@%p]"), \ (l)->sink.name ? (l)->sink.name : "", \ (l)->sink.element); \ gst_parse_free_link (l); \ }else if( (!(l)->sink.element) && (!(l)->sink.name) ){ \ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("link has no sink [source=%s@%p]"), \ (l)->src.name ? (l)->src.name : "", \ (l)->src.element); \ gst_parse_free_link (l); \ }else{ \ graph->links = g_slist_append (graph->links, l ); \ } \ } G_STMT_END typedef struct { gchar *src_pad; gchar *sink_pad; GstElement *sink; GstCaps *caps; gulong pad_added_signal_id, no_more_pads_signal_id; } DelayedLink; typedef struct { gchar *name; gchar *value_str; gulong signal_id; } DelayedSet; static int gst_resolve_reference(reference_t *rr, GstElement *pipeline){ GstBin *bin; if(rr->element) return 0; /* already resolved! */ if(!rr->name) return -2; /* no chance! */ if (GST_IS_BIN (pipeline)){ bin = GST_BIN (pipeline); rr->element = gst_bin_get_by_name_recurse_up (bin, rr->name); } else { rr->element = strcmp (GST_ELEMENT_NAME (pipeline), rr->name) == 0 ? gst_object_ref(pipeline) : NULL; } if(rr->element) return 0; /* resolved */ else return -1; /* not found */ } static void gst_parse_free_delayed_set (DelayedSet *set) { g_free(set->name); g_free(set->value_str); g_slice_free(DelayedSet, set); } static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object, const gchar * name, gpointer data); static void gst_parse_add_delayed_set (GstElement *element, gchar *name, gchar *value_str) { DelayedSet *data = g_slice_new0 (DelayedSet); GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "delaying property set %s to %s", name, value_str); data->name = g_strdup(name); data->value_str = g_strdup(value_str); data->signal_id = g_signal_connect_data(element, "child-added", G_CALLBACK (gst_parse_new_child), data, (GClosureNotify) gst_parse_free_delayed_set, (GConnectFlags) 0); /* FIXME: we would need to listen on all intermediate bins too */ if (GST_IS_BIN (element)) { gchar **names, **current; GstElement *parent, *child; current = names = g_strsplit (name, "::", -1); parent = gst_bin_get_by_name (GST_BIN_CAST (element), current[0]); current++; while (parent && current[0]) { child = gst_bin_get_by_name (GST_BIN (parent), current[0]); if (!child && current[1]) { char *sub_name = g_strjoinv ("::", ¤t[0]); gst_parse_add_delayed_set(parent, sub_name, value_str); g_free (sub_name); } gst_object_unref (parent); parent = child; current++; } if (parent) gst_object_unref (parent); g_strfreev (names); } } static void gst_parse_new_child(GstChildProxy *child_proxy, GObject *object, const gchar * name, gpointer data) { DelayedSet *set = (DelayedSet *) data; GParamSpec *pspec; GValue v = { 0, }; GObject *target = NULL; GType value_type; GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, child_proxy, "new child %s, checking property %s", name, set->name); if (gst_child_proxy_lookup (child_proxy, set->name, &target, &pspec)) { gboolean got_value = FALSE; value_type = pspec->value_type; GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, child_proxy, "parsing delayed property %s as a %s from %s", pspec->name, g_type_name (value_type), set->value_str); g_value_init (&v, value_type); if (gst_value_deserialize (&v, set->value_str)) got_value = TRUE; else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) { GstElement *bin; bin = gst_parse_bin_from_description_full (set->value_str, TRUE, NULL, GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_PLACE_IN_BIN, NULL); if (bin) { g_value_set_object (&v, bin); got_value = TRUE; } } g_signal_handler_disconnect (child_proxy, set->signal_id); if (!got_value) goto error; g_object_set_property (target, pspec->name, &v); } else { const gchar *obj_name = GST_OBJECT_NAME(object); gint len = strlen (obj_name); /* do a delayed set */ if ((strlen (set->name) > (len + 2)) && !strncmp (set->name, obj_name, len) && !strncmp (&set->name[len], "::", 2)) { gst_parse_add_delayed_set (GST_ELEMENT(child_proxy), set->name, set->value_str); } } out: if (G_IS_VALUE (&v)) g_value_unset (&v); if (target) g_object_unref (target); return; error: GST_CAT_ERROR (GST_CAT_PIPELINE, "could not set property \"%s\" in %" GST_PTR_FORMAT, pspec->name, target); goto out; } static void gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph) { GParamSpec *pspec = NULL; gchar *pos = value; GValue v = { 0, }; GObject *target = NULL; GType value_type; /* do nothing if assignment is for missing element */ if (element == NULL) goto out; /* parse the string, so the property name is null-terminated and pos points to the beginning of the value */ while (!g_ascii_isspace (*pos) && (*pos != '=')) pos++; if (*pos == '=') { *pos = '\0'; } else { *pos = '\0'; pos++; while (g_ascii_isspace (*pos)) pos++; } pos++; while (g_ascii_isspace (*pos)) pos++; /* truncate a string if it is delimited with double quotes */ if (*pos == '"' && pos[strlen (pos) - 1] == '"') { pos++; pos[strlen (pos) - 1] = '\0'; } gst_parse_unescape (pos); if (GST_IS_CHILD_PROXY (element)) { if (!gst_child_proxy_lookup (GST_CHILD_PROXY (element), value, &target, &pspec)) { /* do a delayed set */ gst_parse_add_delayed_set (element, value, pos); } } else { pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element), value); if (pspec != NULL) { target = g_object_ref (element); GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, target, "found %s property", value); } else { SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \ _("no property \"%s\" in element \"%s\""), value, \ GST_ELEMENT_NAME (element)); } } if (pspec != NULL && target != NULL) { gboolean got_value = FALSE; value_type = pspec->value_type; GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, element, "parsing property %s as a %s", pspec->name, g_type_name (value_type)); g_value_init (&v, value_type); if (gst_value_deserialize (&v, pos)) got_value = TRUE; else if (g_type_is_a (value_type, GST_TYPE_ELEMENT)) { GstElement *bin; bin = gst_parse_bin_from_description_full (pos, TRUE, NULL, GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_PLACE_IN_BIN, NULL); if (bin) { g_value_set_object (&v, bin); got_value = TRUE; } } if (!got_value) goto error; g_object_set_property (target, pspec->name, &v); } out: gst_parse_strfree (value); if (G_IS_VALUE (&v)) g_value_unset (&v); if (target) g_object_unref (target); return; error: SET_ERROR (graph->error, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY, _("could not set property \"%s\" in element \"%s\" to \"%s\""), value, GST_ELEMENT_NAME (element), pos); goto out; } static void gst_parse_free_reference (reference_t *rr) { if(rr->element) gst_object_unref(rr->element); gst_parse_strfree (rr->name); g_slist_foreach (rr->pads, (GFunc) gst_parse_strfree, NULL); g_slist_free (rr->pads); } static void gst_parse_free_link (link_t *link) { gst_parse_free_reference (&(link->src)); gst_parse_free_reference (&(link->sink)); if (link->caps) gst_caps_unref (link->caps); gst_parse_link_free (link); } static void gst_parse_free_chain (chain_t *ch) { GSList *walk; gst_parse_free_reference (&(ch->first)); gst_parse_free_reference (&(ch->last)); for(walk=ch->elements;walk;walk=walk->next) gst_object_unref (walk->data); g_slist_free (ch->elements); gst_parse_chain_free (ch); } static void gst_parse_free_delayed_link (DelayedLink *link) { g_free (link->src_pad); g_free (link->sink_pad); if (link->caps) gst_caps_unref (link->caps); g_slice_free (DelayedLink, link); } #define PRETTY_PAD_NAME_FMT "%s %s of %s named %s" #define PRETTY_PAD_NAME_ARGS(elem, pad_name) \ (pad_name ? "pad " : "some"), (pad_name ? pad_name : "pad"), \ G_OBJECT_TYPE_NAME(elem), GST_STR_NULL (GST_ELEMENT_NAME (elem)) static void gst_parse_no_more_pads (GstElement *src, gpointer data) { DelayedLink *link = data; GST_ELEMENT_WARNING(src, PARSE, DELAYED_LINK, (_("Delayed linking failed.")), ("failed delayed linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT, PRETTY_PAD_NAME_ARGS (src, link->src_pad), PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad))); /* we keep the handlers connected, so that in case an element still adds a pad * despite no-more-pads, we will consider it for pending delayed links */ } static void gst_parse_found_pad (GstElement *src, GstPad *pad, gpointer data) { DelayedLink *link = data; GST_CAT_INFO (GST_CAT_PIPELINE, "trying delayed linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT, PRETTY_PAD_NAME_ARGS (src, link->src_pad), PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad)); if (gst_element_link_pads_filtered (src, link->src_pad, link->sink, link->sink_pad, link->caps)) { /* do this here, we don't want to get any problems later on when * unlocking states */ GST_CAT_DEBUG (GST_CAT_PIPELINE, "delayed linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " worked", PRETTY_PAD_NAME_ARGS (src, link->src_pad), PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad)); g_signal_handler_disconnect (src, link->no_more_pads_signal_id); /* releases 'link' */ g_signal_handler_disconnect (src, link->pad_added_signal_id); } } /* both padnames and the caps may be NULL */ static gboolean gst_parse_perform_delayed_link (GstElement *src, const gchar *src_pad, GstElement *sink, const gchar *sink_pad, GstCaps *caps) { GList *templs = gst_element_class_get_pad_template_list ( GST_ELEMENT_GET_CLASS (src)); for (; templs; templs = templs->next) { GstPadTemplate *templ = (GstPadTemplate *) templs->data; if ((GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) && (GST_PAD_TEMPLATE_PRESENCE(templ) == GST_PAD_SOMETIMES)) { DelayedLink *data = g_slice_new (DelayedLink); /* TODO: maybe we should check if src_pad matches this template's names */ GST_CAT_DEBUG (GST_CAT_PIPELINE, "trying delayed link " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT, PRETTY_PAD_NAME_ARGS (src, src_pad), PRETTY_PAD_NAME_ARGS (sink, sink_pad)); data->src_pad = g_strdup (src_pad); data->sink = sink; data->sink_pad = g_strdup (sink_pad); if (caps) { data->caps = gst_caps_copy (caps); } else { data->caps = NULL; } data->pad_added_signal_id = g_signal_connect_data (src, "pad-added", G_CALLBACK (gst_parse_found_pad), data, (GClosureNotify) gst_parse_free_delayed_link, (GConnectFlags) 0); data->no_more_pads_signal_id = g_signal_connect (src, "no-more-pads", G_CALLBACK (gst_parse_no_more_pads), data); return TRUE; } } return FALSE; } /* * performs a link and frees the struct. src and sink elements must be given * return values 0 - link performed * 1 - link delayed * <0 - error */ static gint gst_parse_perform_link (link_t *link, graph_t *graph) { GstElement *src = link->src.element; GstElement *sink = link->sink.element; GSList *srcs = link->src.pads; GSList *sinks = link->sink.pads; g_assert (GST_IS_ELEMENT (src)); g_assert (GST_IS_ELEMENT (sink)); GST_CAT_INFO (GST_CAT_PIPELINE, "linking " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " (%u/%u) with caps \"%" GST_PTR_FORMAT "\"", PRETTY_PAD_NAME_ARGS (src, link->src.name), PRETTY_PAD_NAME_ARGS (sink, link->sink.name), g_slist_length (srcs), g_slist_length (sinks), link->caps); if (!srcs || !sinks) { if (gst_element_link_pads_filtered (src, srcs ? (const gchar *) srcs->data : NULL, sink, sinks ? (const gchar *) sinks->data : NULL, link->caps)) { goto success; } else { if (gst_parse_perform_delayed_link (src, srcs ? (const gchar *) srcs->data : NULL, sink, sinks ? (const gchar *) sinks->data : NULL, link->caps)) { goto success; } else { goto error; } } } if (g_slist_length (link->src.pads) != g_slist_length (link->sink.pads)) { goto error; } while (srcs && sinks) { const gchar *src_pad = (const gchar *) srcs->data; const gchar *sink_pad = (const gchar *) sinks->data; srcs = g_slist_next (srcs); sinks = g_slist_next (sinks); if (gst_element_link_pads_filtered (src, src_pad, sink, sink_pad, link->caps)) { continue; } else { if (gst_parse_perform_delayed_link (src, src_pad, sink, sink_pad, link->caps)) { continue; } else { goto error; } } } success: gst_parse_free_link (link); return 0; error: SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not link %s to %s"), GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink)); gst_parse_free_link (link); return -1; } static int yyerror (void *scanner, graph_t *graph, const char *s); %} %union { gchar *ss; chain_t *cc; link_t *ll; reference_t rr; GstElement *ee; GSList *pp; graph_t *gg; } /* No grammar ambiguities expected, FAIL otherwise */ %expect 0 %token PARSE_URL %token IDENTIFIER %left REF PADREF BINREF %token ASSIGNMENT %token LINK %type binopener %type graph %type chain bin chainlist openchain elementary %type reference %type link %type element %type morepads pads assignments %destructor { gst_parse_strfree ($$); } %destructor { if($$) gst_parse_free_chain($$); } %destructor { gst_parse_free_link ($$); } %destructor { gst_parse_free_reference(&($$));} %destructor { gst_object_unref ($$); } %destructor { GSList *walk; for(walk=$$;walk;walk=walk->next) gst_parse_strfree (walk->data); g_slist_free ($$); } %left '(' ')' %left ',' %right '.' %left '!' '=' %lex-param { void *scanner } %parse-param { void *scanner } %parse-param { graph_t *graph } %pure-parser %start graph %% /************************************************************* * Grammar explanation: * _element_s are specified by an identifier of their type. * a name can be give in the optional property-assignments * coffeeelement * fakesrc name=john * identity silence=false name=frodo * (cont'd) **************************************************************/ element: IDENTIFIER { $$ = gst_element_factory_make ($1, NULL); if ($$ == NULL) { add_missing_element(graph, $1); SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), $1); } gst_parse_strfree ($1); } | element ASSIGNMENT { gst_parse_element_set ($2, $1, graph); $$ = $1; } ; /************************************************************* * Grammar explanation: (cont'd) * a graph has (pure) _element_s, _bin_s and _link_s. * since bins are special elements, bins and elements can * be generalized as _elementary_. * The construction of _bin_s will be discussed later. * (cont'd) * **************************************************************/ elementary: element { $$ = gst_parse_chain_new (); /* g_print ("@%p: CHAINing elementary\n", $$); */ $$->first.element = $1? gst_object_ref($1) : NULL; $$->last.element = $1? gst_object_ref($1) : NULL; $$->first.name = $$->last.name = NULL; $$->first.pads = $$->last.pads = NULL; $$->elements = $1 ? g_slist_prepend (NULL, $1) : NULL; } | bin { $$=$1; } ; /************************************************************* * Grammar explanation: (cont'd) * a _chain_ is a list of _elementary_s that have _link_s inbetween * which are represented through infix-notation. * * fakesrc ! sometransformation ! fakesink * * every _link_ can be augmented with _pads_. * * coffeesrc .sound ! speakersink * multisrc .movie,ads ! .projector,smallscreen multisink * * and every _link_ can be setup to filter media-types * mediasrc ! audio/x-raw, signed=TRUE ! stereosink * * User HINT: * if the lexer does not recognize your media-type it * will make it an element name. that results in errors * like * NO SUCH ELEMENT: no element audio7x-raw * '7' vs. '/' in https://en.wikipedia.org/wiki/QWERTZ * * Parsing HINT: * in the parser we need to differ between chains that can * be extended by more elementaries (_openchain_) and others * that are syntactically closed (handled later in this file). * (e.g. fakesrc ! sinkreferencename.padname) **************************************************************/ chain: openchain { $$=$1; if($$->last.name){ SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX, _("unexpected reference \"%s\" - ignoring"), $$->last.name); gst_parse_strfree($$->last.name); $$->last.name=NULL; } if($$->last.pads){ SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX, _("unexpected pad-reference \"%s\" - ignoring"), (gchar*)$$->last.pads->data); g_slist_foreach ($$->last.pads, (GFunc) gst_parse_strfree, NULL); g_slist_free ($$->last.pads); $$->last.pads=NULL; } } ; openchain: elementary pads { $$=$1; $$->last.pads = g_slist_concat ($$->last.pads, $2); /* g_print ("@%p@%p: FKI elementary pads\n", $1, $$->last.pads); */ } | openchain link pads elementary pads { $2->src = $1->last; $2->sink = $4->first; $2->sink.pads = g_slist_concat ($3, $2->sink.pads); TRY_SETUP_LINK($2); $4->first = $1->first; $4->elements = g_slist_concat ($1->elements, $4->elements); gst_parse_chain_free($1); $$ = $4; $$->last.pads = g_slist_concat ($$->last.pads, $5); } ; link: LINK { $$ = gst_parse_link_new (); $$->src.element = NULL; $$->sink.element = NULL; $$->src.name = NULL; $$->sink.name = NULL; $$->src.pads = NULL; $$->sink.pads = NULL; $$->caps = NULL; if ($1) { $$->caps = gst_caps_from_string ($1); if ($$->caps == NULL) SET_ERROR (graph->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1); gst_parse_strfree ($1); } } ; pads: /* NOP */ { $$ = NULL; } | PADREF morepads { $$ = $2; $$ = g_slist_prepend ($$, $1); } ; morepads: /* NOP */ { $$ = NULL; } | ',' IDENTIFIER morepads { $$ = g_slist_prepend ($3, $2); } ; /************************************************************* * Grammar explanation: (cont'd) * the first and last elements of a _chain_ can be give * as URL. This creates special elements that fit the URL. * * fakesrc ! http://fake-sink.org * http://somesource.org ! fakesink **************************************************************/ chain: openchain link PARSE_URL { GstElement *element = gst_element_make_from_uri (GST_URI_SINK, $3, NULL, NULL); /* FIXME: get and parse error properly */ if (!element) { SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no sink element for URI \"%s\""), $3); } $$ = $1; $2->sink.element = element?gst_object_ref(element):NULL; $2->src = $1->last; TRY_SETUP_LINK($2); $$->last.element = NULL; $$->last.name = NULL; $$->last.pads = NULL; if(element) $$->elements = g_slist_append ($$->elements, element); g_free ($3); } ; openchain: PARSE_URL { GstElement *element = gst_element_make_from_uri (GST_URI_SRC, $1, NULL, NULL); /* FIXME: get and parse error properly */ if (!element) { SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no source element for URI \"%s\""), $1); } $$ = gst_parse_chain_new (); /* g_print ("@%p: CHAINing srcURL\n", $$); */ $$->first.element = NULL; $$->first.name = NULL; $$->first.pads = NULL; $$->last.element = element ? gst_object_ref(element):NULL; $$->last.name = NULL; $$->last.pads = NULL; $$->elements = element ? g_slist_prepend (NULL, element) : NULL; g_free($1); } ; /************************************************************* * Grammar explanation: (cont'd) * the first and last elements of a _chain_ can be linked * to a named _reference_ (with optional pads). * * fakesrc ! nameOfSinkElement. * fakesrc ! nameOfSinkElement.Padname * fakesrc ! nameOfSinkElement.Padname, anotherPad * nameOfSource.Padname ! fakesink **************************************************************/ chain: openchain link reference { $$ = $1; $2->sink= $3; $2->src = $1->last; TRY_SETUP_LINK($2); $$->last.element = NULL; $$->last.name = NULL; $$->last.pads = NULL; } ; openchain: reference { $$ = gst_parse_chain_new (); $$->last=$1; $$->first.element = NULL; $$->first.name = NULL; $$->first.pads = NULL; $$->elements = NULL; } ; reference: REF morepads { gchar *padname = $1; GSList *pads = $2; if (padname) { while (*padname != '.') padname++; *padname = '\0'; padname++; if (*padname != '\0') pads = g_slist_prepend (pads, gst_parse_strdup (padname)); } $$.element=NULL; $$.name=$1; $$.pads=pads; } ; /************************************************************* * Grammar explanation: (cont'd) * a _chainlist_ is just a list of _chain_s. * * You can specify _link_s with named * _reference_ on each side. That * works already after the explanations above. * someSourceName.Pad ! someSinkName. * someSourceName.Pad,anotherPad ! someSinkName.Apad,Bpad * * If a syntax error occurs, the already finished _chain_s * and _links_ are kept intact. *************************************************************/ chainlist: /* NOP */ { $$ = NULL; } | chainlist chain { if ($1){ gst_parse_free_reference(&($1->last)); gst_parse_free_reference(&($2->first)); $2->first = $1->first; $2->elements = g_slist_concat ($1->elements, $2->elements); gst_parse_chain_free ($1); } $$ = $2; } | chainlist error { $$=$1; GST_CAT_DEBUG (GST_CAT_PIPELINE,"trying to recover from syntax error"); SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX, _("syntax error")); } ; /************************************************************* * Grammar explanation: (cont'd) * _bins_ *************************************************************/ assignments: /* NOP */ { $$ = NULL; } | ASSIGNMENT assignments { $$ = g_slist_prepend ($2, $1); } ; binopener: '(' { $$ = gst_parse_strdup("bin"); } | BINREF { $$ = $1; } ; bin: binopener assignments chainlist ')' { chain_t *chain = $3; GSList *walk; GstBin *bin = (GstBin *) gst_element_factory_make ($1, NULL); if (!chain) { SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY_BIN, _("specified empty bin \"%s\", not allowed"), $1); chain = gst_parse_chain_new (); chain->first.element = chain->last.element = NULL; chain->first.name = chain->last.name = NULL; chain->first.pads = chain->last.pads = NULL; chain->elements = NULL; } if (!bin) { add_missing_element(graph, $1); SET_ERROR (graph->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no bin \"%s\", unpacking elements"), $1); /* clear property-list */ g_slist_foreach ($2, (GFunc) gst_parse_strfree, NULL); g_slist_free ($2); $2 = NULL; } else { for (walk = chain->elements; walk; walk = walk->next ) gst_bin_add (bin, GST_ELEMENT (walk->data)); g_slist_free (chain->elements); chain->elements = g_slist_prepend (NULL, bin); } $$ = chain; /* set the properties now * HINT: property-list cleared above, if bin==NULL */ for (walk = $2; walk; walk = walk->next) gst_parse_element_set ((gchar *) walk->data, GST_ELEMENT (bin), graph); g_slist_free ($2); gst_parse_strfree ($1); } ; /************************************************************* * Grammar explanation: (cont'd) * _graph_ *************************************************************/ graph: chainlist { $$ = graph; $$->chain = $1; if(!$1) { SET_ERROR (graph->error, GST_PARSE_ERROR_EMPTY, _("empty pipeline not allowed")); } } ; %% static int yyerror (void *scanner, graph_t *graph, const char *s) { /* FIXME: This should go into the GError somehow, but how? */ GST_WARNING ("Error during parsing: %s", s); return -1; } GstElement * priv_gst_parse_launch (const gchar *str, GError **error, GstParseContext *ctx, GstParseFlags flags) { graph_t g; gchar *dstr; GSList *walk; GstBin *bin = NULL; GstElement *ret; yyscan_t scanner; g_return_val_if_fail (str != NULL, NULL); g_return_val_if_fail (error == NULL || *error == NULL, NULL); g.chain = NULL; g.links = NULL; g.error = error; g.ctx = ctx; g.flags = flags; #ifdef __GST_PARSE_TRACE GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled"); __strings = __chains = __links = 0; #endif /* __GST_PARSE_TRACE */ /* g_print("Now scanning: %s\n", str); */ dstr = g_strdup (str); priv_gst_parse_yylex_init (&scanner); priv_gst_parse_yy_scan_string (dstr, scanner); #if YYDEBUG yydebug = 1; #endif if (yyparse (scanner, &g) != 0) { SET_ERROR (error, GST_PARSE_ERROR_SYNTAX, "Unrecoverable syntax error while parsing pipeline %s", str); priv_gst_parse_yylex_destroy (scanner); g_free (dstr); goto error1; } priv_gst_parse_yylex_destroy (scanner); g_free (dstr); GST_CAT_DEBUG (GST_CAT_PIPELINE, "got %u elements and %u links", g.chain ? g_slist_length (g.chain->elements) : 0, g_slist_length (g.links)); /* ensure chain is not NULL */ if (!g.chain){ g.chain=gst_parse_chain_new (); g.chain->elements=NULL; g.chain->first.element=NULL; g.chain->first.name=NULL; g.chain->first.pads=NULL; g.chain->last.element=NULL; g.chain->last.name=NULL; g.chain->last.pads=NULL; }; /* ensure elements is not empty */ if(!g.chain->elements){ g.chain->elements= g_slist_prepend (NULL, NULL); }; /* put all elements in our bin if necessary */ if(g.chain->elements->next){ if (flags & GST_PARSE_FLAG_PLACE_IN_BIN) bin = GST_BIN (gst_element_factory_make ("bin", NULL)); else bin = GST_BIN (gst_element_factory_make ("pipeline", NULL)); g_assert (bin); for (walk = g.chain->elements; walk; walk = walk->next) { if (walk->data != NULL) gst_bin_add (bin, GST_ELEMENT (walk->data)); } g_slist_free (g.chain->elements); g.chain->elements = g_slist_prepend (NULL, bin); } ret = (GstElement *) g.chain->elements->data; g_slist_free (g.chain->elements); g.chain->elements=NULL; if (GST_IS_BIN (ret)) bin = GST_BIN (ret); gst_parse_free_chain (g.chain); g.chain = NULL; /* resolve and perform links */ for (walk = g.links; walk; walk = walk->next) { link_t *l = (link_t *) walk->data; int err; err=gst_resolve_reference( &(l->src), ret); if (err) { if(-1==err){ SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No src-element named \"%s\" - omitting link", l->src.name); }else{ /* probably a missing element which we've handled already */ SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No src-element found - omitting link"); } gst_parse_free_link (l); continue; } err=gst_resolve_reference( &(l->sink), ret); if (err) { if(-1==err){ SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No sink-element named \"%s\" - omitting link", l->src.name); }else{ /* probably a missing element which we've handled already */ SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No sink-element found - omitting link"); } gst_parse_free_link (l); continue; } gst_parse_perform_link (l, &g); } g_slist_free (g.links); out: #ifdef __GST_PARSE_TRACE GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: %u strings, %u chains and %u links left", __strings, __chains, __links); if (__strings || __chains || __links) { g_warning ("TRACE: %u strings, %u chains and %u links left", __strings, __chains, __links); } #endif /* __GST_PARSE_TRACE */ return ret; error1: if (g.chain) { gst_parse_free_chain (g.chain); g.chain=NULL; } g_slist_foreach (g.links, (GFunc)gst_parse_free_link, NULL); g_slist_free (g.links); if (error) g_assert (*error); ret = NULL; goto out; }