%{ #include "../gst_private.h" #include #include #include #include #include #include #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; static guint __elements; 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_new0 (link_t, 1); /* 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_free (data); g_return_if_fail (__links > 0); __links--; } } chain_t * __gst_parse_chain_new (void) { chain_t *ret; __chains++; ret = g_new0 (chain_t, 1); /* 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_free (data); g_return_if_fail (__chains > 0); __chains--; } element_t * __gst_parse_element_new (void) { element_t *ret; __elements++; ret = g_new0 (element_t, 1); /* g_print ("@%p: ALLOCATED ELEMENT (%3u):\n", ret, __elements); */ return ret; } void __gst_parse_element_free (element_t *data) { /* g_print ("@%p: FREEING ELEMENT (%3u):\n", data, __elements - 1); */ g_free (data); g_return_if_fail (__elements > 0); __elements--; } #endif /* __GST_PARSE_TRACE */ /******************************************************************************************* *** define SET_ERROR macro/function * * SET_ERROR() must only be called from the thread running priv_gst_parse_launch() and must * only be used for errors that occur during the initial construction of the chain, i.e. * before priv_gst_parse_launch() returns. *******************************************************************************************/ static void error_append_probable_reason (graph_t *graph); #ifdef G_HAVE_ISO_VARARGS # define SET_ERROR(graph, type, ...) \ G_STMT_START { \ GError** error = (graph)->error; \ GST_CAT_ERROR (GST_CAT_PIPELINE, __VA_ARGS__); \ if ((error) && !*(error)) { \ g_set_error ((error), GST_PARSE_ERROR, (type), __VA_ARGS__); \ error_append_probable_reason ((graph)); \ } \ } G_STMT_END #elif defined(G_HAVE_GNUC_VARARGS) # define SET_ERROR(graph, type, args...) \ G_STMT_START { \ GError** error = (graph)->error; \ GST_CAT_ERROR (GST_CAT_PIPELINE, args ); \ if (error && !*error) { \ g_set_error (error, GST_PARSE_ERROR, (type), args ); \ error_append_probable_reason ((graph)); \ } \ } G_STMT_END #else static inline void SET_ERROR (graph_t *graph, gint type, const char *format, ...) { GError** error = graph->error; 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); error_append_probable_reason ((graph)); } } } #endif /* G_HAVE_ISO_VARARGS */ static void error_append_probable_reason (graph_t *graph) { g_return_if_fail (*graph->error); GError* error = *graph->error; reason_receiver_t* receiver = graph->error_probable_reason_receiver; /* If by the time SET_ERROR() was called no bus was set, there is no receiver * and no error from the bus to append. */ if (!receiver) return; g_mutex_lock (&receiver->mutex); if (receiver->reason) { gchar *new_message = g_strdup_printf ("%s -- %s", error->message, receiver->reason); g_free (error->message); error->message = new_message; } g_mutex_unlock (&receiver->mutex); } /*** 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)); } } static gchar * str_unwrap (const gchar * s) { gchar *ret; gchar *read, *write; /* NULL string returns NULL */ if (s == NULL) return NULL; /* make copy of original string to hold the result. This * string will always be smaller than the original */ ret = g_strdup (s); read = ret; write = ret; while (*read) { if (GST_ASCII_IS_STRING (*read)) { /* normal chars are just copied */ *write++ = *read++; } else if (*read == '\\') { /* got an escape char, move to next position to read a tripplet * of octal numbers */ read++; /* is the next char a possible first octal number? */ if (*read >= '0' && *read <= '3') { /* parse other 2 numbers, if one of them is not in the range of * an octal number, we error. We also catch the case where a zero * byte is found here. */ if (read[1] < '0' || read[1] > '7' || read[2] < '0' || read[2] > '7') goto beach; /* now convert the octal number to a byte again. */ *write++ = ((read[0] - '0') << 6) + ((read[1] - '0') << 3) + (read[2] - '0'); read += 3; } else { /* if we run into a \0 here, we definitely won't get a quote later */ if (*read == 0) goto beach; /* else copy \X sequence */ *write++ = *read++; } } else if (*read == '\0') { goto beach; } else { *write++ = *read++; } } /* null terminate result string and return */ *write = '\0'; return ret; beach: g_free (ret); return NULL; } /******************************************************************************************* *** helpers for pipeline-setup *******************************************************************************************/ #define TRY_SETUP_LINK(l) G_STMT_START { \ if( (!(l)->src.element) && (!(l)->src.name) ){ \ SET_ERROR (graph, 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, 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; gboolean all_pads; } 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_free(set); } static void gst_parse_new_child (GstChildProxy *child_proxy, GObject *object, const gchar * name, gpointer data); static void gst_parse_add_delayed_set (GstChildProxy *proxy, gchar *name, gchar *value_str) { DelayedSet *data = g_new0 (DelayedSet, 1); gchar **names, **current; GObject *parent, *child; GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, proxy, "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 (proxy, "child-added", G_CALLBACK (gst_parse_new_child), data, (GClosureNotify) gst_parse_free_delayed_set, (GConnectFlags) 0); current = names = g_strsplit (name, "::", -1); parent = gst_child_proxy_get_child_by_name (GST_CHILD_PROXY (proxy), current[0]); current++; while (parent && current[0]) { if (!GST_IS_CHILD_PROXY (parent)) { GST_INFO ("Not recursing into non-proxy child %p", parent); break; } child = gst_child_proxy_get_child_by_name (GST_CHILD_PROXY (parent), current[0]); if (!child && current[1]) { char *sub_name = g_strjoinv ("::", ¤t[0]); gst_parse_add_delayed_set (GST_CHILD_PROXY (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 gboolean gst_parse_separate_prop_from_children (const gchar *name, gchar **children, gchar **property) { static const gchar *separator = "::"; const gchar *prop = NULL; g_return_val_if_fail (name, FALSE); g_return_val_if_fail (children, FALSE); g_return_val_if_fail (property, FALSE); /* Given "child1::child2::prop" isolate "prop" */ prop = g_strrstr (name, separator); if (!prop) { GST_WARNING ("%s is not a valid childproxy path", name); return FALSE; } /* Make a copy of prop skipping "::" */ *property = g_strdup (prop + 2); /* Extract "child1::child2" from "child1::child2::prop" */ *children = g_strndup (name, strlen (name) - strlen (prop)); return TRUE; } 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_with_pspec (&v, set->value_str, pspec)) 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 { gint len = strlen (name); /* * We've been notified that a new child has beed added, but the * property was still not found. Three things could be happening: * * 1. The target property is of the form obj_name::child_name::property * and is for a child that does not (yet) exist: * We need to add the delayed property setting handler on that new child. * * 2. The target property is of the form obj_name::property or * obj_name::child_name::property and the child already exists: * We warn about a nonexistent property * * 3. The target property is of the form other_obj_name::child_name::property * or other_obj_name::property: * We ignore this case as another delayed set will catch it. */ /* Cases 1,2: The child just added corresponds to this delayed set */ if ((strlen (set->name) > (len+2)) && !strncmp (set->name, name, len) && !strncmp (&set->name[len], "::", 2)) { gchar *children = NULL; gchar *prop = NULL; GObject *child = NULL; if (!gst_parse_separate_prop_from_children (set->name, &children, &prop)) { /* Malformed property name, ignore */ return; } child = gst_child_proxy_get_child_by_name_recurse (child_proxy, children); g_free (children); g_free (prop); /* Case 1: A child in the hierarchy does not exist yet, add a new delayed set */ if (NULL == child) { gst_parse_add_delayed_set (child_proxy, set->name, set->value_str); } /* Case 2: The target child exists already but there's no such property */ else { gst_object_unref (child); GST_ELEMENT_WARNING(GST_ELEMENT (child_proxy), PARSE, NO_SUCH_PROPERTY, (_("No such property.")), (_("no property \"%s\" in element \"%s\""), set->name, GST_ELEMENT_NAME(child_proxy))); } } /* Case 3: The child just added does not correspond to this delayed set, just ignore * else { } */ } out: if (G_IS_VALUE (&v)) g_value_unset (&v); if (target) gst_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 gchar * gst_parse_split_assignment (gchar *value) { gchar *pos = value; /* 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); return pos; } static gboolean collect_value (GParamSpec *pspec, gchar *value_str, GValue *v) { gboolean got_value = FALSE; GST_CAT_LOG (GST_CAT_PIPELINE, "parsing property %s as a %s", pspec->name, g_type_name (pspec->value_type)); g_value_init (v, pspec->value_type); if (gst_value_deserialize_with_pspec (v, value_str, pspec)) got_value = TRUE; else if (g_type_is_a (pspec->value_type, GST_TYPE_ELEMENT)) { GstElement *bin; bin = gst_parse_bin_from_description_full (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; } } return got_value; } static void gst_parse_element_preset (gchar *value, GstElement *element, graph_t *graph) { /* do nothing if preset is for missing element or its not a preset element */ if (element == NULL) goto out; if (!GST_IS_PRESET(element)) goto not_a_preset; /* do nothing if no preset is given */ if (value == NULL || *value == '\0') goto out; gst_parse_unescape (value); if (!gst_preset_load_preset (GST_PRESET (element), value)) goto error; out: return; not_a_preset: SET_ERROR (graph, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY, _("Element \"%s\" is not a GstPreset"), GST_ELEMENT_NAME (element)); goto out; error: SET_ERROR (graph, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY, _("could not set preset \"%s\" in element \"%s\""), value, GST_ELEMENT_NAME (element)); goto out; } typedef struct { gchar *name; gchar *value; } proxied_property_t; static void proxied_property_free (proxied_property_t *pp) { g_free (pp); } static GstElement * gst_parse_element_make (graph_t *graph, element_t *data) { GstElementFactory *loaded_factory; GstElementFactory *factory = gst_element_factory_find (data->factory_name); GObjectClass *klass; GParamSpec *pspec = NULL; GSList *tmp; gboolean is_proxy; GSList *proxied = NULL; guint n_params = 0; guint n_params_alloc = 16; const gchar **names_array; GValue *values_array; GstElement *ret = NULL; if (!factory) { SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), data->factory_name); return NULL; } loaded_factory = GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE (factory))); gst_object_unref (factory); klass = g_type_class_ref (gst_element_factory_get_element_type (loaded_factory)); is_proxy = g_type_is_a (gst_element_factory_get_element_type (loaded_factory), GST_TYPE_CHILD_PROXY); names_array = g_new0 (const gchar *, n_params_alloc); values_array = g_new0 (GValue, n_params_alloc); for (tmp = data->values; tmp; tmp = tmp->next) { gchar *name = tmp->data; gchar *value = gst_parse_split_assignment (tmp->data); if (is_proxy && strstr (name, "::") != NULL) { proxied_property_t *pp = g_new (proxied_property_t, 1); pp->name = name; pp->value = value; proxied = g_slist_prepend (proxied, pp); continue; } pspec = g_object_class_find_property (klass, name); if (pspec != NULL) { if (G_UNLIKELY (n_params == n_params_alloc)) { n_params_alloc *= 2u; names_array = g_realloc (names_array, sizeof (const gchar *) * n_params_alloc); values_array = g_realloc (values_array, sizeof (GValue) * n_params_alloc); memset (&values_array[n_params], 0, sizeof (GValue) * (n_params_alloc - n_params)); } if (!collect_value (pspec, value, &values_array[n_params])) { SET_ERROR (graph, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY, _("could not set property \"%s\" in element \"%s\" to \"%s\""), name, data->factory_name, value); g_value_unset (&values_array[n_params]); goto done; } else { names_array[n_params] = name; } ++n_params; } else { SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \ _("no property \"%s\" in element \"%s\""), name, \ data->factory_name); goto done; } } ret = gst_element_factory_create_with_properties (factory, n_params, names_array, values_array); for (tmp = proxied; tmp; tmp = tmp->next) { GObject *target = NULL; proxied_property_t *pp = tmp->data; if (!gst_child_proxy_lookup (GST_CHILD_PROXY (ret), pp->name, &target, &pspec)) { /* the property was not found. if the target child doesn't exist then we do a delayed set waiting for new elements to be added. If the child was found, we fail since the property doesn't exist. */ gchar *children = NULL; gchar *property = NULL; if (!gst_parse_separate_prop_from_children (pp->name, &children, &property)) { /* malformed childproxy path, skip */ continue; } target = gst_child_proxy_get_child_by_name_recurse (GST_CHILD_PROXY (ret), children); g_free (children); g_free (property); if (target == NULL) { gst_parse_add_delayed_set (GST_CHILD_PROXY (ret), pp->name, pp->value); } else { gst_object_unref (target); SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \ _("no property \"%s\" in element \"%s\""), pp->name, \ GST_ELEMENT_NAME (ret)); goto done; } } else { GValue v = { 0, }; if (!collect_value (pspec, pp->value, &v)) { SET_ERROR (graph, GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY, _("could not set property \"%s\" in child of element \"%s\" to \"%s\""), pp->name, data->factory_name, pp->value); g_value_unset (&v); goto done; } else { g_object_set_property (target, pspec->name, &v); g_value_unset (&v); } gst_object_unref (target); } } for (tmp = data->presets; tmp; tmp = tmp->next) { gst_parse_element_preset (tmp->data, ret, graph); } done: g_slist_free_full (proxied, (GDestroyNotify) proxied_property_free); gst_object_unref (loaded_factory); g_type_class_unref (klass); g_free (names_array); while (n_params--) g_value_unset (&values_array[n_params]); g_free (values_array); return ret; } static gboolean gst_parse_child_proxy_find_child ( GstChildProxy * child_proxy, const gchar *name) { gchar **names = NULL, **current = NULL; GObject *obj = NULL; gboolean found = FALSE; obj = G_OBJECT (g_object_ref (child_proxy)); current = names = g_strsplit (name, "::", -1); /* find the owner of the property */ while (current[1]) { GObject *next = NULL; /* Cannot ask for the child of a non-childproxy */ if (!GST_IS_CHILD_PROXY (obj)) { break; } next = gst_child_proxy_get_child_by_name (GST_CHILD_PROXY (obj), current[0]); /* The child doesn't exist yet */ if (!next) { break; } gst_object_unref (obj); obj = next; current++; } gst_object_unref (obj); g_strfreev (names); /* The remaining name is the property, we have found the object */ if (current[1] == NULL) { found = TRUE; } return found; } static void gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph) { GParamSpec *pspec = NULL; gchar *pos; GValue v = { 0, }; GObject *target = NULL; /* do nothing if assignment is for missing element */ if (element == NULL) goto out; pos = gst_parse_split_assignment (value); if (GST_IS_CHILD_PROXY (element) && strstr (value, "::") != NULL) { if (!gst_child_proxy_lookup (GST_CHILD_PROXY (element), value, &target, &pspec)) { /* the property was not found. if the target child doesn't exist then we do a delayed set waiting for new elements to be added. If the child was found, we fail since the property doesn't exist. */ if (!gst_parse_child_proxy_find_child (GST_CHILD_PROXY (element), value)) { gst_parse_add_delayed_set (GST_CHILD_PROXY (element), value, pos); } else { goto error; } } } else { pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element), value); if (pspec != NULL) { target = G_OBJECT (g_object_ref (element)); GST_CAT_LOG_OBJECT (GST_CAT_PIPELINE, target, "found %s property", value); } else { SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_PROPERTY, \ _("no property \"%s\" in element \"%s\""), value, \ GST_ELEMENT_NAME (element)); } } if (pspec != NULL && target != NULL) { if (!collect_value (pspec, pos, &v)) { goto error; } else { g_object_set_property (target, pspec->name, &v); } } out: gst_parse_strfree (value); if (G_IS_VALUE (&v)) g_value_unset (&v); if (target) gst_object_unref (target); return; error: SET_ERROR (graph, 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_element (element_t *el) { g_slist_free_full (el->values, gst_parse_strfree); g_slist_free_full (el->presets, gst_parse_strfree); gst_parse_strfree (el->factory_name); gst_parse_element_free (el); } 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_free (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; /* Don't warn for all-pads links, as we expect those to * still be active at no-more-pads */ if (!link->all_pads) { 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 %s " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT, link->all_pads ? "all pads" : "one pad", 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 %s " PRETTY_PAD_NAME_FMT " to " PRETTY_PAD_NAME_FMT " worked", link->all_pads ? "all pads" : "one pad", PRETTY_PAD_NAME_ARGS (src, link->src_pad), PRETTY_PAD_NAME_ARGS (link->sink, link->sink_pad)); /* releases 'link' */ if (!link->all_pads) { g_signal_handler_disconnect (src, link->no_more_pads_signal_id); 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, gboolean all_pads) { 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_new (DelayedLink, 1); data->all_pads = all_pads; /* 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; } static gboolean gst_parse_element_can_do_caps (GstElement * e, GstPadDirection dir, GstCaps * link_caps) { gboolean can_do = FALSE, done = FALSE; GstIterator *it; it = (dir == GST_PAD_SRC) ? gst_element_iterate_src_pads (e) : gst_element_iterate_sink_pads (e); while (!done && !can_do) { GValue v = G_VALUE_INIT; GstPad *pad; GstCaps *caps; switch (gst_iterator_next (it, &v)) { case GST_ITERATOR_OK: pad = g_value_get_object (&v); caps = gst_pad_get_current_caps (pad); if (caps == NULL) caps = gst_pad_query_caps (pad, NULL); can_do = gst_caps_can_intersect (caps, link_caps); GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT, can_do, caps, link_caps); gst_caps_unref (caps); g_value_unset (&v); break; case GST_ITERATOR_DONE: case GST_ITERATOR_ERROR: done = TRUE; break; case GST_ITERATOR_RESYNC: gst_iterator_resync (it); break; } } gst_iterator_free (it); return can_do; } static gchar* format_pad_names(const GSList* list) { if (!list) return g_strdup ("(any)"); GString* str = g_string_new (NULL); gboolean is_first = TRUE; while (list) { if (!is_first) g_string_append (str, ", "); g_string_append (str, (const gchar *) list->data); list = list->next; is_first = FALSE; } return g_string_free (str, 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)); #ifndef GST_DISABLE_GST_DEBUG gchar* srcpad_names = format_pad_names (srcs); gchar* sinkpad_names = format_pad_names (sinks); GST_CAT_INFO (GST_CAT_PIPELINE, "linking pads {%s} of %s named %s to pads {%s} of %s named %s with caps \"%" GST_PTR_FORMAT "\"", srcpad_names, G_OBJECT_TYPE_NAME (src), GST_STR_NULL (GST_ELEMENT_NAME (src)), sinkpad_names, G_OBJECT_TYPE_NAME (sink), GST_STR_NULL (GST_ELEMENT_NAME (sink)), link->caps); g_free (srcpad_names); g_free (sinkpad_names); #endif if (!srcs || !sinks) { gboolean found_one = gst_element_link_pads_filtered (src, srcs ? (const gchar *) srcs->data : NULL, sink, sinks ? (const gchar *) sinks->data : NULL, link->caps); if (found_one) { if (!link->all_pads) goto success; /* Linked one, and not an all-pads link = we're done */ /* Try and link more available pads */ while (gst_element_link_pads_filtered (src, srcs ? (const gchar *) srcs->data : NULL, sink, sinks ? (const gchar *) sinks->data : NULL, link->caps)); } /* We either didn't find any static pads, or this is a all-pads link, * in which case watch for future pads and link those. Not a failure * in the all-pads case if there's no sometimes pads to watch */ if (gst_parse_perform_delayed_link (src, srcs ? (const gchar *) srcs->data : NULL, sink, sinks ? (const gchar *) sinks->data : NULL, link->caps, link->all_pads) || link->all_pads) { 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, link->all_pads)) { continue; } else { goto error; } } } success: gst_parse_free_link (link); return 0; error: if (link->caps != NULL) { gboolean src_can_do_caps, sink_can_do_caps; gchar *caps_str = gst_caps_to_string (link->caps); src_can_do_caps = gst_parse_element_can_do_caps (src, GST_PAD_SRC, link->caps); sink_can_do_caps = gst_parse_element_can_do_caps (sink, GST_PAD_SINK, link->caps); if (!src_can_do_caps && sink_can_do_caps) { SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not link %s to %s, %s can't handle caps %s"), GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), GST_ELEMENT_NAME (src), caps_str); } else if (src_can_do_caps && !sink_can_do_caps) { SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not link %s to %s, %s can't handle caps %s"), GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), GST_ELEMENT_NAME (sink), caps_str); } else if (!src_can_do_caps && !sink_can_do_caps) { SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not link %s to %s, neither element can handle caps %s"), GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str); } else { SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not link %s to %s with caps %s"), GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str); } g_free (caps_str); } else { SET_ERROR (graph, 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; element_t *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 PRESET %token LINK %token LINK_ALL %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(&($$));} %destructor { gst_parse_free_element ($$); } %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 } @BISON_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 { $$ = gst_parse_element_new(); $$->factory_name = $1; /* silence unused but set warnings/errors */ (void) yynerrs; } | element PRESET { $$->presets = g_slist_append ($$->presets, $2); $$ = $1; } | element ASSIGNMENT { $$->values = g_slist_append ($$->values, $2); $$ = $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 { GstElement *element = NULL; $$ = gst_parse_chain_new (); if ($1 && !(element = gst_parse_element_make (graph, $1))) { add_missing_element(graph, $1->factory_name); } else { /* g_print ("@%p: CHAINing elementary\n", $$); */ $$->first.element = element ? gst_object_ref(element) : NULL; $$->last.element = element ? gst_object_ref(element) : NULL; $$->first.name = $$->last.name = NULL; $$->first.pads = $$->last.pads = NULL; $$->elements = element ? g_slist_prepend (NULL, element) : NULL; } gst_parse_free_element ($1); } | bin { $$=$1; } ; /************************************************************* * Grammar explanation: (cont'd) * a _chain_ is a list of _elementary_s that have _link_s in between * 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, GST_PARSE_ERROR_SYNTAX, _("unexpected reference \"%s\" - ignoring"), $$->last.name); gst_parse_strfree($$->last.name); $$->last.name=NULL; } if($$->last.pads){ SET_ERROR (graph, 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 (); $$->all_pads = FALSE; if ($1) { gchar *str = str_unwrap ($1); $$->caps = gst_caps_from_string (str); g_free (str); if ($$->caps == NULL) SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1); gst_parse_strfree ($1); } } | LINK_ALL { $$ = gst_parse_link_new (); $$->all_pads = TRUE; if ($1) { gchar *str = str_unwrap ($1); $$->caps = gst_caps_from_string (str); g_free (str); if ($$->caps == NULL) SET_ERROR (graph, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $1); gst_parse_strfree ($1); } } ; pads: /* NOP */ { $$ = NULL; } | PADREF morepads { $$ = $2; $$ = g_slist_prepend ($$, $1); } ; morepads: /* NOP */ { $$ = NULL; } | ',' IDENTIFIER morepads { $$ = g_slist_prepend ($3, $2); } ; /************************************************************* * Grammar explanation: (cont'd) * the first and last elements of a _chain_ can be give * as URL. This creates special elements that fit the URL. * * fakesrc ! http://fake-sink.org * http://somesource.org ! fakesink **************************************************************/ chain: openchain link PARSE_URL { GstElement *element = gst_element_make_from_uri (GST_URI_SINK, $3, NULL, NULL); /* FIXME: get and parse error properly */ if (!element) { SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no sink element for URI \"%s\""), $3); } $$ = $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 ($$->elements, element); g_free ($3); } ; openchain: PARSE_URL { GstElement *element = gst_element_make_from_uri (GST_URI_SRC, $1, NULL, NULL); /* FIXME: get and parse error properly */ if (!element) { SET_ERROR (graph, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no source element for URI \"%s\""), $1); } $$ = 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, 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, 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, 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, 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; } static GstBusSyncReply parse_launch_handle_message_sync (GstBus * bus, GstMessage * message, gpointer user_data) { reason_receiver_t *receiver = (reason_receiver_t *) user_data; GstObject *src = GST_MESSAGE_SRC (message); GstMessageType type = GST_MESSAGE_TYPE (message); switch (type) { case GST_MESSAGE_ERROR: { GError *error; gchar *debug_msg; gchar *explanation; const GstStructure *details; gst_message_parse_error (message, &error, &debug_msg); gst_message_parse_error_details (message, &details); explanation = gst_info_strdup_printf ("%s %" GST_PTR_FORMAT " posted " "an error message: %s", src ? G_OBJECT_TYPE_NAME(src) : "", src, error->message); /* We lock the mutex a bit early so that if errors occur simultaneously * from two threads the following log lines are logged one error at a * time, just for convenience of the person reading the logs. */ g_mutex_lock (&receiver->mutex); GST_CAT_ERROR (GST_CAT_PIPELINE, "%s", explanation); if (debug_msg) GST_CAT_ERROR (GST_CAT_PIPELINE, "Debug message: %s", debug_msg); if (details) GST_CAT_ERROR (GST_CAT_PIPELINE, "Details: %" GST_PTR_FORMAT, details); /* This message will be suffixed when SET_ERROR() is called. * This allows the message to be seen in gst-launch even if no logging is * enabled, which is the default for GStreamer releases. */ if (!receiver->reason) receiver->reason = g_strdup (explanation); g_mutex_unlock (&receiver->mutex); g_free (explanation); g_error_free (error); g_free (debug_msg); break; } default: break; } return GST_BUS_PASS; } static reason_receiver_t* reason_receiver_new (void) { reason_receiver_t *receiver = g_atomic_rc_box_new0 (reason_receiver_t); g_mutex_init (&receiver->mutex); receiver->reason = NULL; return receiver; } static void reason_receiver_clear (reason_receiver_t *receiver) { g_mutex_clear (&receiver->mutex); g_free (receiver->reason); } #define reason_receiver_ref(receiver) g_atomic_rc_box_acquire (receiver) static void reason_receiver_unref (reason_receiver_t *receiver) { g_atomic_rc_box_release_full (receiver, (GDestroyNotify) reason_receiver_clear); } GstElement * priv_gst_parse_launch (const gchar *str, GError **error, GstParseContext *ctx, GstParseFlags flags) { graph_t g; gchar *dstr; GSList *walk; GstElement *ret; yyscan_t scanner; GstBin *bin = NULL; GstBus *temp_bus = NULL, *old_bus = NULL; 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; g.error_probable_reason_receiver = NULL; #ifdef __GST_PARSE_TRACE GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled"); __strings = __chains = __links = __elements = 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 (&g, 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); /* Assign the bin a temporary bus to catch any error messages posted during * the construction of the pipeline and log them in a way that is visible * by default in gst-launch. */ old_bus = gst_element_get_bus (GST_ELEMENT (bin)); temp_bus = gst_bus_new (); g.error_probable_reason_receiver = reason_receiver_new (); gst_bus_set_sync_handler (temp_bus, parse_launch_handle_message_sync, reason_receiver_ref (g.error_probable_reason_receiver), (GDestroyNotify) reason_receiver_unref); gst_element_set_bus (GST_ELEMENT (bin), temp_bus); 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; 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 (&g, 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 (&g, 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 (&g, 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 (&g, 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, %u links and %u elements left", __strings, __chains, __links, __elements); if (__strings || __chains || __links || __elements) { g_warning ("TRACE: %u strings, %u chains, %u links and %u elements left", __strings, __chains, __links, __elements); } #endif /* __GST_PARSE_TRACE */ if (bin && temp_bus) { gst_element_set_bus (GST_ELEMENT (bin), old_bus); reason_receiver_unref (g.error_probable_reason_receiver); g.error_probable_reason_receiver = NULL; g_clear_object (&temp_bus); g_clear_object (&old_bus); } 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; }