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gstreamer/gst/parse/grammar.y
Edward Hervey 7c1d700384 parse: Move variable to block where it's used 
There was a dead assignment used outside of the bin/pipeline creation
which was confusing (and unused). Just move that variable to
where it is actually used.

(Note that that variable was not needed outside of that block since
the refactoring done in 2b33d33185 )
2018-12-15 11:46:26 +01:00

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%{
#include "../gst_private.h"
#include <glib-object.h>
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#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;
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 ("::", &current[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 { $$=$1; }
;
/*************************************************************
* Grammar explanation: (cont'd)
* a _chain_ is a list of _elementary_s that have _link_s in between
* which are represented through infix-notation.
*
* fakesrc ! sometransformation ! fakesink
*
* every _link_ can be augmented with _pads_.
*
* coffeesrc .sound ! speakersink
* multisrc .movie,ads ! .projector,smallscreen multisink
*
* and every _link_ can be setup to filter media-types
* mediasrc ! audio/x-raw, signed=TRUE ! stereosink
*
* User HINT:
* if the lexer does not recognize your media-type it
* will make it an element name. that results in errors
* like
* NO SUCH ELEMENT: no element audio7x-raw
* '7' vs. '/' in https://en.wikipedia.org/wiki/QWERTZ
*
* Parsing HINT:
* in the parser we need to differ between chains that can
* be extended by more elementaries (_openchain_) and others
* that are syntactically closed (handled later in this file).
* (e.g. fakesrc ! sinkreferencename.padname)
**************************************************************/
chain: openchain { $$=$1;
if($$->last.name){
SET_ERROR (graph->error, GST_PARSE_ERROR_SYNTAX,
_("unexpected reference \"%s\" - ignoring"), $$->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;
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){
GstBin *bin;
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;
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;
}
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