--- /dev/null
+%{
+/* SPDX-License-Identifier: LGPL-2.1-only */
+/**
+ * This is imported from GStreamer and altered to parse GST-Pipeline
+ */
+
+#include <glib-object.h>
+#include <glib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.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
+
+/*******************************************************************************************
+*** 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;
+ 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_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 (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;
+
+ /* 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));
+ g_signal_handler_disconnect (src, link->no_more_pads_signal_id);
+ /* releases 'link' */
+ if (!link->all_pads)
+ 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_slice_new (DelayedLink);
+
+ 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;
+}
+
+/*
+ * 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) {
+ 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->error, 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->error, 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->error, 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->error, 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->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 <ss> PARSE_URL
+%token <ss> IDENTIFIER
+%left <ss> REF PADREF BINREF
+%token <ss> ASSIGNMENT
+%token <ss> LINK
+%token <ss> LINK_ALL
+
+%type <ss> binopener
+%type <gg> graph
+%type <cc> chain bin chainlist openchain elementary
+%type <rr> reference
+%type <ll> link
+%type <ee> element
+%type <pp> morepads pads assignments
+
+%destructor { gst_parse_strfree ($$); } <ss>
+%destructor { if($$)
+ gst_parse_free_chain($$); } <cc>
+%destructor { gst_parse_free_link ($$); } <ll>
+%destructor { gst_parse_free_reference(&($$));} <rr>
+%destructor { gst_object_unref ($$); } <ee>
+%destructor { GSList *walk;
+ for(walk=$$;walk;walk=walk->next)
+ gst_parse_strfree (walk->data);
+ g_slist_free ($$); } <pp>
+
+
+
+%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 { $$ = gst_parse_link_new ();
+ $$->all_pads = FALSE;
+ 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);
+ }
+ }
+ | LINK_ALL { $$ = gst_parse_link_new ();
+ $$->all_pads = TRUE;
+ 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;
+}
projects / platform / upstream / nnstreamer.git / commitdiff