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gstreamer/gst/parse/grammar.y
Wim Taymans c47dc4d853 First THREADED backport attempt, focusing on adding locks and making sure the API is threadsafe. Needs more work. Mor... 
Original commit message from CVS:
First THREADED backport attempt, focusing on adding locks and
making sure the API is threadsafe. Needs more work. More docs
follow this week.
2005-03-07 18:27:42 +00:00

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%{
#include <glib-object.h>
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../gst_private.h"
#include "../gst-i18n-lib.h"
#include "../gstconfig.h"
#include "../gstparse.h"
#include "../gstinfo.h"
#include "../gsterror.h"
#include "../gsturi.h"
#include "../gstutils.h"
#include "../gstvalue.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 YYPARSE_PARAM graph
#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 ()
{
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 ()
{
chain_t *ret;
__chains++;
ret = g_new0 (chain_t, 1);
/* g_print ("ALLOCATED CHAIN (%3u): %p\n", __chains, ret); */
return ret;
}
void
__gst_parse_chain_free (chain_t *data)
{
/* g_print ("FREEING CHAIN (%3u): %p\n", __chains - 1, data); */
g_free (data);
g_return_if_fail (__chains > 0);
__chains--;
}
#endif /* __GST_PARSE_TRACE */
typedef struct {
gchar *src_pad;
gchar *sink_pad;
GstElement *sink;
GstCaps *caps;
gulong signal_id;
/* FIXME: need to connect to "disposed" signal to clean up, but there is no such signal */
} DelayedLink;
#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
#define ERROR(type, ...) SET_ERROR (((graph_t *) graph)->error, (type), __VA_ARGS__ )
#ifndef GST_DISABLE_GST_DEBUG
# define YYDEBUG 1
/* bison 1.35 calls this macro with side effects, we need to make sure the
side effects work - crappy bison
# define YYFPRINTF(a, ...) GST_CAT_DEBUG (GST_CAT_PIPELINE, __VA_ARGS__)
*/
# define YYFPRINTF(a, ...) G_STMT_START{ \
gchar *temp = g_strdup_printf (__VA_ARGS__); \
GST_CAT_LOG (GST_CAT_PIPELINE, temp); \
g_free (temp); \
}G_STMT_END
#endif
#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
#define ERROR(type, args...) SET_ERROR (((graph_t *) graph)->error, (type) , args )
#ifndef GST_DISABLE_GST_DEBUG
# define YYDEBUG 1
/* bison 1.35 calls this macro with side effects, we need to make sure the
side effects work - crappy bison
# define YYFPRINTF(a, args...) GST_CAT_DEBUG (GST_CAT_PIPELINE, args )
*/
# define YYFPRINTF(a, args...) G_STMT_START{ \
gchar *temp = g_strdup_printf ( args ); \
GST_CAT_LOG (GST_CAT_PIPELINE, temp); \
g_free (temp); \
}G_STMT_END
#endif
#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);
}
}
}
#ifndef GST_DISABLE_GST_DEBUG
# define YYDEBUG 1
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
#endif
#define GST_BIN_MAKE(res, type, chainval, assign) G_STMT_START{ \
chain_t *chain = chainval; \
GSList *walk; \
GstBin *bin = (GstBin *) gst_element_factory_make (type, NULL); \
if (!chain) { \
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_EMPTY_BIN, _("specified empty bin \"%s\", not allowed"), type); \
g_slist_foreach (assign, (GFunc) gst_parse_strfree, NULL); \
g_slist_free (assign); \
YYERROR; \
} else if (!bin) { \
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no bin \"%s\", skipping"), type); \
g_slist_foreach (assign, (GFunc) gst_parse_strfree, NULL); \
g_slist_free (assign); \
res = chain; \
} 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); \
res = chain; \
/* set the properties now */ \
for (walk = assign; walk; walk = walk->next) \
gst_parse_element_set ((gchar *) walk->data, GST_ELEMENT (bin), graph); \
g_slist_free (assign); \
} \
}G_STMT_END
#define MAKE_LINK(link, _src, _src_name, _src_pads, _sink, _sink_name, _sink_pads) G_STMT_START{ \
link = gst_parse_link_new (); \
link->src = _src; \
link->sink = _sink; \
link->src_name = _src_name; \
link->sink_name = _sink_name; \
link->src_pads = _src_pads; \
link->sink_pads = _sink_pads; \
link->caps = NULL; \
}G_STMT_END
#define MAKE_REF(link, _src, _pads) G_STMT_START{ \
gchar *padname = _src; \
GSList *pads = _pads; \
if (padname) { \
while (*padname != '.') padname++; \
*padname = '\0'; \
padname++; \
if (*padname != '\0') \
pads = g_slist_prepend (pads, gst_parse_strdup (padname)); \
} \
MAKE_LINK (link, NULL, _src, pads, NULL, NULL, NULL); \
}G_STMT_END
static void
gst_parse_element_set (gchar *value, GstElement *element, graph_t *graph)
{
GParamSpec *pspec;
gchar *pos = value;
GValue v = { 0, };
GValue v2 = { 0, };
/* parse the string, so the property name is null-terminated an 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++;
if (*pos == '"') {
pos++;
pos[strlen (pos) - 1] = '\0';
}
gst_parse_unescape (pos);
if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element), value))) {
g_value_init (&v, G_PARAM_SPEC_VALUE_TYPE(pspec));
if (!gst_value_deserialize (&v, pos))
goto error;
g_object_set_property (G_OBJECT (element), value, &v);
} else {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_NO_SUCH_PROPERTY, _("no property \"%s\" in element \"%s\""), value, GST_ELEMENT_NAME (element));
}
out:
gst_parse_strfree (value);
if (G_IS_VALUE (&v))
g_value_unset (&v);
if (G_IS_VALUE (&v2))
g_value_unset (&v2);
return;
error:
SET_ERROR (((graph_t *) 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 inline void
gst_parse_free_link (link_t *link)
{
gst_parse_strfree (link->src_name);
gst_parse_strfree (link->sink_name);
g_slist_foreach (link->src_pads, (GFunc) gst_parse_strfree, NULL);
g_slist_foreach (link->sink_pads, (GFunc) gst_parse_strfree, NULL);
g_slist_free (link->src_pads);
g_slist_free (link->sink_pads);
if (link->caps) gst_caps_unref (link->caps);
gst_parse_link_free (link);
}
static void
gst_parse_element_lock (GstElement *element, gboolean lock)
{
GstPad *pad;
GstIterator *pads;
gboolean unlocked_peer = FALSE;
gboolean done = FALSE;
GList *walk;
if (gst_element_is_locked_state (element) == lock)
return;
return;
/* check if we have an unlocked peer */
pads = gst_element_iterate_pads (element);
while (!done) {
gpointer data;
switch (gst_iterator_next (pads, &data)) {
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (data);
pad = gst_pad_realize (pad);
if (GST_PAD_IS_SINK (pad) && GST_PAD_PEER (pad) &&
!gst_element_is_locked_state (GST_PAD_PARENT (GST_PAD_PEER (pad)))) {
unlocked_peer = TRUE;
done = TRUE;
}
gst_object_unref (GST_OBJECT (pad));
break;
}
case GST_ITERATOR_RESYNC:
unlocked_peer = FALSE;
gst_iterator_resync (pads);
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
default:
g_assert_not_reached ();
break;
}
}
gst_iterator_free (pads);
if (!(lock && unlocked_peer)) {
GST_CAT_DEBUG (GST_CAT_PIPELINE, "setting locked state on element");
gst_element_set_locked_state (element, lock);
if (!lock)
{
/* try to sync state with parent */
GST_CAT_DEBUG (GST_CAT_PIPELINE, "trying to sync state of element with parent");
/* FIXME: it would be nice if we can figure out why it failed
(e.g. caps nego) and give an error about that instead. */
if (gst_element_set_state (element, GST_STATE_PLAYING) == GST_STATE_FAILURE)
GST_ELEMENT_ERROR (element, CORE, STATE_CHANGE, (NULL), (NULL));
}
} else {
return;
}
/* check if there are other pads to (un)lock */
walk = (GList *) element->pads;
for (; walk; walk = walk->next) {
pad = (GstPad *) GST_PAD_REALIZE (walk->data);
if (GST_PAD_IS_SRC (pad) && GST_PAD_PEER (pad)) {
GstElement *next = GST_ELEMENT (GST_OBJECT_PARENT (GST_PAD_PEER (pad)));
if (gst_element_is_locked_state (next) != lock)
gst_parse_element_lock (next, lock);
}
}
}
static void
gst_parse_found_pad (GstElement *src, GstPad *pad, gpointer data)
{
DelayedLink *link = (DelayedLink *) data;
GST_CAT_INFO (GST_CAT_PIPELINE, "trying delayed linking %s:%s to %s:%s",
GST_ELEMENT_NAME (src), link->src_pad,
GST_ELEMENT_NAME (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:%s to %s:%s worked",
GST_ELEMENT_NAME (src), link->src_pad,
GST_ELEMENT_NAME (link->sink), link->sink_pad);
g_signal_handler_disconnect (src, link->signal_id);
g_free (link->src_pad);
g_free (link->sink_pad);
if (link->caps) gst_caps_unref (link->caps);
if (!gst_element_is_locked_state (src))
gst_parse_element_lock (link->sink, FALSE);
g_free (link);
}
}
/* both padnames and the caps may be NULL */
static gboolean
gst_parse_perform_delayed_link (GstElement *src, const gchar *src_pad,
GstElement *sink, const gchar *sink_pad, GstCaps *caps)
{
GList *templs = gst_element_class_get_pad_template_list (GST_ELEMENT_GET_CLASS (src));
for (; templs; templs = templs->next) {
GstPadTemplate *templ = (GstPadTemplate *) templs->data;
if ((GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) && (GST_PAD_TEMPLATE_PRESENCE(templ) == GST_PAD_SOMETIMES))
{
DelayedLink *data = g_new (DelayedLink, 1);
/* TODO: maybe we should check if src_pad matches this template's names */
GST_CAT_DEBUG (GST_CAT_PIPELINE, "trying delayed link %s:%s to %s:%s",
GST_ELEMENT_NAME (src), src_pad, GST_ELEMENT_NAME (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->signal_id = g_signal_connect (G_OBJECT (src), "new_pad",
G_CALLBACK (gst_parse_found_pad), data);
return TRUE;
}
}
return FALSE;
}
/*
* performs a link and frees the struct. src and sink elements must be given
* return values 0 - link performed
* 1 - link delayed
* <0 - error
*/
static gint
gst_parse_perform_link (link_t *link, graph_t *graph)
{
GstElement *src = link->src;
GstElement *sink = link->sink;
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 %s:%s to %s:%s (%u/%u) with caps \"%" GST_PTR_FORMAT "\"",
GST_ELEMENT_NAME (src), link->src_name ? link->src_name : "(any)",
GST_ELEMENT_NAME (sink), link->sink_name ? link->sink_name : "(any)",
g_slist_length (srcs), g_slist_length (sinks),
link->caps);
if (!srcs || !sinks) {
if (gst_element_link_pads_filtered (src, srcs ? (const gchar *) srcs->data : NULL,
sink, sinks ? (const gchar *) sinks->data : NULL,
link->caps)) {
gst_parse_element_lock (sink, gst_element_is_locked_state (src));
goto success;
} else {
if (gst_parse_perform_delayed_link (src, srcs ? (const gchar *) srcs->data : NULL,
sink, sinks ? (const gchar *) sinks->data : NULL,
link->caps)) {
gst_parse_element_lock (sink, TRUE);
goto success;
} else {
goto error;
}
}
}
if (g_slist_length (link->src_pads) != g_slist_length (link->src_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)) {
gst_parse_element_lock (sink, gst_element_is_locked_state (src));
continue;
} else {
if (gst_parse_perform_delayed_link (src, src_pad,
sink, sink_pad,
link->caps)) {
gst_parse_element_lock (sink, TRUE);
continue;
} else {
goto error;
}
}
}
success:
gst_parse_free_link (link);
return 0;
error:
SET_ERROR (((graph_t *) 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 yylex (void *lvalp);
static int yyerror (const char *s);
%}
%union {
gchar *s;
chain_t *c;
link_t *l;
GstElement *e;
GSList *p;
graph_t *g;
}
%token <s> PARSE_URL
%token <s> IDENTIFIER
%left <s> REF PADREF BINREF
%token <s> ASSIGNMENT
%token <s> LINK
%type <g> graph
%type <c> chain bin
%type <l> reference
%type <l> linkpart link
%type <p> linklist
%type <e> element
%type <p> padlist pads assignments
%left '{' '}' '(' ')'
%left ','
%right '.'
%left '!' '='
%pure_parser
%start graph
%%
element: IDENTIFIER { $$ = gst_element_factory_make ($1, NULL);
if (!$$)
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, _("no element \"%s\""), $1);
gst_parse_strfree ($1);
if (!$$)
YYERROR;
}
| element ASSIGNMENT { gst_parse_element_set ($2, $1, graph);
$$ = $1;
}
;
assignments: /* NOP */ { $$ = NULL; }
| assignments ASSIGNMENT { $$ = g_slist_prepend ($1, $2); }
;
bin: '{' assignments chain '}' { GST_BIN_MAKE ($$, "thread", $3, $2); }
| '(' assignments chain ')' { GST_BIN_MAKE ($$, "bin", $3, $2); }
| BINREF assignments chain ')' { GST_BIN_MAKE ($$, $1, $3, $2);
gst_parse_strfree ($1);
}
| '{' assignments '}' { GST_BIN_MAKE ($$, "thread", NULL, $2); }
| '(' assignments '}' { GST_BIN_MAKE ($$, "thread", NULL, $2); }
| BINREF assignments ')' { GST_BIN_MAKE ($$, $1, NULL, $2);
gst_parse_strfree ($1);
}
| '{' assignments error '}' { GST_BIN_MAKE ($$, "thread", NULL, $2); }
| '(' assignments error '}' { GST_BIN_MAKE ($$, "thread", NULL, $2); }
| BINREF assignments error ')' { GST_BIN_MAKE ($$, $1, NULL, $2);
gst_parse_strfree ($1);
}
;
pads: PADREF { $$ = g_slist_prepend (NULL, $1); }
| PADREF padlist { $$ = $2;
$$ = g_slist_prepend ($$, $1);
}
;
padlist: ',' IDENTIFIER { $$ = g_slist_prepend (NULL, $2); }
| ',' IDENTIFIER padlist { $$ = g_slist_prepend ($3, $2); }
;
reference: REF { MAKE_REF ($$, $1, NULL); }
| REF padlist { MAKE_REF ($$, $1, $2); }
;
linkpart: reference { $$ = $1; }
| pads { MAKE_REF ($$, NULL, $1); }
| /* NOP */ { MAKE_REF ($$, NULL, NULL); }
;
link: linkpart LINK linkpart { $$ = $1;
if ($2) {
$$->caps = gst_caps_from_string ($2);
if (!$$->caps)
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("could not parse caps \"%s\""), $2);
gst_parse_strfree ($2);
}
$$->sink_name = $3->src_name;
$$->sink_pads = $3->src_pads;
gst_parse_link_free ($3);
}
;
linklist: link { $$ = g_slist_prepend (NULL, $1); }
| link linklist { $$ = g_slist_prepend ($2, $1); }
| linklist error { $$ = $1; }
;
chain: element { $$ = gst_parse_chain_new ();
$$->first = $$->last = $1;
$$->front = $$->back = NULL;
$$->elements = g_slist_prepend (NULL, $1);
}
| bin { $$ = $1; }
| chain chain { if ($1->back && $2->front) {
if (!$1->back->sink_name) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without source element"));
gst_parse_free_link ($1->back);
} else {
((graph_t *) graph)->links = g_slist_prepend (((graph_t *) graph)->links, $1->back);
}
if (!$2->front->src_name) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
gst_parse_free_link ($2->front);
} else {
((graph_t *) graph)->links = g_slist_prepend (((graph_t *) graph)->links, $2->front);
}
$1->back = NULL;
} else if ($1->back) {
if (!$1->back->sink_name) {
$1->back->sink = $2->first;
}
} else if ($2->front) {
if (!$2->front->src_name) {
$2->front->src = $1->last;
}
$1->back = $2->front;
}
if ($1->back) {
((graph_t *) graph)->links = g_slist_prepend (((graph_t *) graph)->links, $1->back);
}
$1->last = $2->last;
$1->back = $2->back;
$1->elements = g_slist_concat ($1->elements, $2->elements);
if ($2)
gst_parse_chain_free ($2);
$$ = $1;
}
| chain linklist { GSList *walk;
if ($1->back) {
$2 = g_slist_prepend ($2, $1->back);
$1->back = NULL;
} else {
if (!((link_t *) $2->data)->src_name) {
((link_t *) $2->data)->src = $1->last;
}
}
for (walk = $2; walk; walk = walk->next) {
link_t *link = (link_t *) walk->data;
if (!link->sink_name && walk->next) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
gst_parse_free_link (link);
} else if (!link->src_name && !link->src) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without source element"));
gst_parse_free_link (link);
} else {
if (walk->next) {
((graph_t *) graph)->links = g_slist_prepend (((graph_t *) graph)->links, link);
} else {
$1->back = link;
}
}
}
g_slist_free ($2);
$$ = $1;
}
| chain error { $$ = $1; }
| link chain { if ($2->front) {
if (!$2->front->src_name) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without source element"));
gst_parse_free_link ($2->front);
} else {
((graph_t *) graph)->links = g_slist_prepend (((graph_t *) graph)->links, $2->front);
}
}
if (!$1->sink_name) {
$1->sink = $2->first;
}
$2->front = $1;
$$ = $2;
}
| PARSE_URL chain { $$ = $2;
if ($$->front) {
GstElement *element =
gst_element_make_from_uri (GST_URI_SRC, $1, NULL);
if (!element) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
_("no source element for URI \"%s\""), $1);
} else {
$$->front->src = element;
((graph_t *) graph)->links = g_slist_prepend (
((graph_t *) graph)->links, $$->front);
$$->front = NULL;
$$->elements = g_slist_prepend ($$->elements, element);
}
} else {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK,
_("no element to link URI \"%s\" to"), $1);
}
g_free ($1);
}
| link PARSE_URL { GstElement *element =
gst_element_make_from_uri (GST_URI_SINK, $2, NULL);
if (!element) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_NO_SUCH_ELEMENT,
_("no sink element for URI \"%s\""), $2);
YYERROR;
} else if ($1->sink_name || $1->sink_pads) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK,
_("could not link sink element for URI \"%s\""), $2);
YYERROR;
} else {
$$ = gst_parse_chain_new ();
$$->first = $$->last = element;
$$->front = $1;
$$->front->sink = element;
$$->elements = g_slist_prepend (NULL, element);
}
g_free ($2);
}
;
graph: /* NOP */ { SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_EMPTY, _("empty pipeline not allowed"));
$$ = (graph_t *) graph;
}
| chain { $$ = (graph_t *) graph;
if ($1->front) {
if (!$1->front->src_name) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without source element"));
gst_parse_free_link ($1->front);
} else {
$$->links = g_slist_prepend ($$->links, $1->front);
}
$1->front = NULL;
}
if ($1->back) {
if (!$1->back->sink_name) {
SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERROR_LINK, _("link without sink element"));
gst_parse_free_link ($1->back);
} else {
$$->links = g_slist_prepend ($$->links, $1->back);
}
$1->back = NULL;
}
$$->chain = $1;
}
;
%%
extern FILE *_gst_parse_yyin;
int _gst_parse_yylex (YYSTYPE *lvalp);
static int yylex (void *lvalp) {
return _gst_parse_yylex ((YYSTYPE*) lvalp);
}
static int
yyerror (const char *s)
{
/* FIXME: This should go into the GError somehow, but how? */
g_warning ("error: %s", s);
return -1;
}
struct yy_buffer_state * _gst_parse_yy_scan_string (char*);
void _gst_parse_yy_delete_buffer (struct yy_buffer_state *);
GstElement *
_gst_parse_launch (const gchar *str, GError **error)
{
graph_t g;
gchar *dstr;
GSList *walk;
GstBin *bin = NULL;
GstElement *ret;
struct yy_buffer_state *buf;
g_return_val_if_fail (str != NULL, NULL);
g.chain = NULL;
g.links = NULL;
g.error = error;
#ifdef __GST_PARSE_TRACE
GST_CAT_DEBUG (GST_CAT_PIPELINE, "TRACE: tracing enabled");
__strings = __chains = __links = 0;
#endif /* __GST_PARSE_TRACE */
dstr = g_strdup (str);
buf = _gst_parse_yy_scan_string (dstr);
#ifndef GST_DISABLE_GST_DEBUG
yydebug = 1;
#endif
if (yyparse (&g) != 0) {
SET_ERROR (error, GST_PARSE_ERROR_SYNTAX, "Unrecoverable syntax error while parsing pipeline %s", str);
goto error1;
}
g_free (dstr);
_gst_parse_yy_delete_buffer (buf);
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));
if (!g.chain) {
ret = NULL;
} else if (!(((chain_t *) g.chain)->elements->next)) {
/* only one toplevel element */
ret = (GstElement *) ((chain_t *) g.chain)->elements->data;
g_slist_free (((chain_t *) g.chain)->elements);
if (GST_IS_BIN (ret))
bin = GST_BIN (ret);
gst_parse_chain_free (g.chain);
} else {
/* put all elements in our bin */
bin = GST_BIN (gst_element_factory_make ("pipeline", NULL));
g_assert (bin);
for (walk = g.chain->elements; walk; walk = walk->next)
gst_bin_add (bin, GST_ELEMENT (walk->data));
g_slist_free (g.chain->elements);
ret = GST_ELEMENT (bin);
gst_parse_chain_free (g.chain);
}
/* remove links */
for (walk = g.links; walk; walk = walk->next) {
link_t *l = (link_t *) walk->data;
if (!l->src) {
if (l->src_name) {
if (bin) {
l->src = gst_bin_get_by_name_recurse_up (bin, l->src_name);
} else {
l->src = strcmp (GST_ELEMENT_NAME (ret), l->src_name) == 0 ? ret : NULL;
}
}
if (!l->src) {
SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No element named \"%s\" - omitting link", l->src_name);
gst_parse_free_link (l);
continue;
}
}
if (!l->sink) {
if (l->sink_name) {
if (bin) {
l->sink = gst_bin_get_by_name_recurse_up (bin, l->sink_name);
} else {
l->sink = strcmp (GST_ELEMENT_NAME (ret), l->sink_name) == 0 ? ret : NULL;
}
}
if (!l->sink) {
SET_ERROR (error, GST_PARSE_ERROR_NO_SUCH_ELEMENT, "No element named \"%s\" - omitting link", l->sink_name);
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:
g_free (dstr);
if (g.chain) {
g_slist_foreach (g.chain->elements, (GFunc)gst_object_unref, NULL);
g_slist_free (g.chain->elements);
gst_parse_chain_free (g.chain);
}
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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