2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2002 Andy Wingo <wingo@pobox.com>
6 * gstparse.c: get a pipeline from a text pipeline description
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
28 #include "parse/types.h"
30 typedef struct _gst_parse_delayed_pad gst_parse_delayed_pad;
31 struct _gst_parse_delayed_pad
41 GstElement *target_element;
48 gst_parse_error_quark (void)
50 static GQuark quark = 0;
52 quark = g_quark_from_static_string ("gst_parse_error");
56 G_GNUC_UNUSED static void
57 dynamic_connect (GstElement * element, GstPad * newpad, gpointer data)
59 dynamic_connection_t *dc = (dynamic_connection_t *) data;
62 /* do we know the exact srcpadname? */
64 /* see if this is the one */
65 if (strcmp (gst_pad_get_name (newpad), dc->srcpadname)) {
69 /* try to find a target pad if we don't know it yet */
70 if (!dc->target_pad) {
71 dc->target_pad = gst_element_get_compatible_pad (dc->target_element, newpad);
75 if (!GST_PAD_IS_CONNECTED (newpad)) {
76 gst_element_set_state (dc->pipeline, GST_STATE_PAUSED);
77 if (!gst_pad_connect (newpad, dc->target_pad) && warn) {
78 g_warning ("could not connect %s:%s to %s:%s", GST_DEBUG_PAD_NAME (newpad),
79 GST_DEBUG_PAD_NAME (dc->target_pad));
81 gst_element_set_state (dc->pipeline, GST_STATE_PLAYING);
86 make_elements (graph_t *g, GError **error)
92 if (!(g->bins || g->elements)) {
95 GST_PARSE_ERROR_SYNTAX,
100 if (g->current_bin_type)
101 bin_type = g->current_bin_type;
103 bin_type = "pipeline";
105 if (!(g->bin = gst_element_factory_make (bin_type, NULL))) {
108 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
109 "No such bin type %s", bin_type);
115 e = (element_t*)l->data;
116 if (!(e->element = gst_element_factory_make (e->type, NULL))) {
119 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
120 "No such element %s", e->type);
123 gst_bin_add (GST_BIN (g->bin), e->element);
129 if (!make_elements ((graph_t*)l->data, error))
131 gst_bin_add (GST_BIN (g->bin), ((graph_t*)l->data)->bin);
139 set_properties (graph_t *g, GError **error)
148 e = (element_t*)l->data;
149 l2 = e->property_values;
151 p = (property_t*)l2->data;
152 if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (e->element), p->name))) {
153 g_object_set_property (G_OBJECT (e->element), p->name, p->value);
157 GST_PARSE_ERROR_NO_SUCH_PROPERTY,
158 "No such property '%s' in element '%s'",
159 p->name, GST_OBJECT_NAME (GST_OBJECT (e->element)));
162 l2 = g_list_next (l2);
169 if (!set_properties ((graph_t*)l->data, error))
178 find_element_by_index_recurse (graph_t *g, gint i)
186 e = (element_t*)l->data;
195 if ((element = find_element_by_index_recurse ((graph_t*)l->data, i)))
204 find_element_by_index (graph_t *g, gint i)
209 return find_element_by_index_recurse (g, i);
213 make_connections (graph_t *g, GError **error)
217 dynamic_connection_t *dc;
218 GstElement *src, *sink;
220 GstPadTemplate *pt1, *pt2;
224 c = (connection_t*)l->data;
226 if (!(src = gst_bin_get_by_name (GST_BIN (g->bin), c->src_name))) {
229 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
230 "No such element '%s'",
235 src = find_element_by_index (g, c->src_index);
239 if (!(sink = gst_bin_get_by_name (GST_BIN (g->bin), c->sink_name))) {
242 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
243 "No such element '%s'",
248 sink = find_element_by_index (g, c->sink_index);
254 // g_print ("a: %p, b: %p\n", a, b);
256 /* balanced multipad connection */
258 p1 = gst_element_get_pad (src, (gchar*)a->data);
259 p2 = gst_element_get_pad (sink, (gchar*)b->data);
262 goto could_not_get_pad_b;
264 if (!p1 && p2 && (pt1 = gst_element_get_pad_template (src, (gchar*)a->data)) &&
265 pt1->presence == GST_PAD_SOMETIMES) {
266 dc = g_new0 (dynamic_connection_t, 1);
267 dc->srcpadname = (gchar*)a->data;
269 dc->target_element = sink;
270 dc->pipeline = g->bin;
272 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
273 GST_OBJECT_NAME (GST_OBJECT (src)),
274 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
276 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
278 goto could_not_get_pad_a;
279 } else if (!gst_pad_connect (p1, p2)) {
280 goto could_not_connect_pads;
286 if ((pt1 = gst_element_get_pad_template (src, (gchar*)a->data))) {
287 // g_print ("have padtemplate %s, SOMETIMES=%s\n", pt1->name_template, pt1->presence == GST_PAD_SOMETIMES ? "TRUE" : "FALSE");
288 if ((p1 = gst_element_get_pad (src, (gchar*)a->data)) || pt1->presence == GST_PAD_SOMETIMES) {
290 /* sigh, a hack until i fix the gstelement api... */
291 if ((pt2 = gst_element_get_compatible_pad_template (sink, pt1))) {
292 // g_print ("have compatible pad template %s\n", pt2->name_template);
293 if ((p2 = gst_element_get_pad (sink, pt2->name_template))) {
294 // g_print ("got the pad\n");
295 dc = g_new0 (dynamic_connection_t, 1);
296 dc->srcpadname = (gchar*)a->data;
298 dc->target_element = NULL;
299 dc->pipeline = g->bin;
301 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
302 GST_OBJECT_NAME (GST_OBJECT (src)),
303 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
305 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
308 /* both pt1 and pt2 are sometimes templates. sheesh. */
309 goto both_templates_have_sometimes_presence;
312 /* if the target pad has no padtemplate we will figure out a target
314 dc = g_new0 (dynamic_connection_t, 1);
315 dc->srcpadname = NULL;
316 dc->target_pad = NULL;
317 dc->target_element = sink;
318 dc->pipeline = g->bin;
320 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s, and some pad in %s",
321 GST_OBJECT_NAME (GST_OBJECT (src)),
322 (gchar*)a->data, GST_OBJECT_NAME (sink));
324 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
328 goto could_not_get_compatible_to_a;
331 goto could_not_get_pad_a;
334 goto could_not_get_pad_a;
337 if (!gst_pad_connect (p1, p2)) {
338 goto could_not_connect_pads;
341 /* we don't support dynamic connections on this side yet, if ever */
342 if (!(p2 = gst_element_get_pad (sink, (gchar*)b->data))) {
343 goto could_not_get_pad_b;
345 if (!(p1 = gst_element_get_compatible_pad (src, p2))) {
346 goto could_not_get_compatible_to_b;
348 if (!gst_pad_connect (p1, p2)) {
349 goto could_not_connect_pads;
352 if (!gst_element_connect (src, sink)) {
353 goto could_not_connect_elements;
362 if (!make_connections ((graph_t*)l->data, error))
372 GST_PARSE_ERROR_CONNECT,
373 "Could not get a pad %s from element %s",
374 (gchar*)a->data, GST_OBJECT_NAME (src));
379 GST_PARSE_ERROR_CONNECT,
380 "Could not get a pad %s from element %s",
381 (gchar*)b->data, GST_OBJECT_NAME (sink));
383 could_not_get_compatible_to_a:
386 GST_PARSE_ERROR_CONNECT,
387 "Could not find a compatible pad in element %s to for %s:%s",
388 GST_OBJECT_NAME (sink), GST_OBJECT_NAME (src), (gchar*)a->data);
390 could_not_get_compatible_to_b:
393 GST_PARSE_ERROR_CONNECT,
394 "Could not find a compatible pad in element %s to for %s:%s",
395 GST_OBJECT_NAME (src), GST_OBJECT_NAME (sink), (gchar*)b->data);
397 both_templates_have_sometimes_presence:
400 GST_PARSE_ERROR_CONNECT,
401 "Both %s:%s and %s:%s have GST_PAD_SOMETIMES presence, operation not supported",
402 GST_OBJECT_NAME (src), pt1->name_template, GST_OBJECT_NAME (sink), pt2->name_template);
404 could_not_connect_pads:
407 GST_PARSE_ERROR_CONNECT,
408 "Could not connect %s:%s to %s:%s",
409 GST_DEBUG_PAD_NAME (p1),
410 GST_DEBUG_PAD_NAME (p2));
412 could_not_connect_elements:
415 GST_PARSE_ERROR_CONNECT,
416 "Could not connect element %s to %s",
417 GST_OBJECT_NAME (src),
418 GST_OBJECT_NAME (sink));
423 pipeline_from_graph (graph_t *g, GError **error)
425 if (!make_elements (g, error))
428 if (!set_properties (g, error))
431 if (!make_connections (g, error))
434 return (GstBin*)g->bin;
439 * @argv: null-terminated array of arguments
441 * Create a new pipeline based on command line syntax.
443 * Returns: a new pipeline on success, NULL on failure
446 gst_parse_launchv (const gchar **argv, GError **error)
450 const gchar **argvp, *arg;
453 /* let's give it a nice size. */
454 str = g_string_sized_new (1024);
459 tmp = _gst_parse_escape (arg);
460 g_string_append (str, tmp);
462 g_string_append (str, " ");
466 pipeline = gst_parse_launch (str->str, error);
468 g_string_free (str, TRUE);
473 gchar *_gst_parse_escape (const gchar *str)
475 GString *gstr = NULL;
477 g_return_val_if_fail (str != NULL, NULL);
479 gstr = g_string_sized_new (strlen (str));
483 g_string_append_c (gstr, '\\');
484 g_string_append_c (gstr, *str);
491 void _gst_parse_unescape (gchar *str)
495 g_return_if_fail (str != NULL);
511 * @pipeline_description: the command line describing the pipeline
513 * Create a new pipeline based on command line syntax.
515 * Returns: a new bin on success, NULL on failure. By default the bin is
516 * a GstPipeline, but it depends on the pipeline_description.
519 gst_parse_launch (const gchar * pipeline_description, GError **error)
522 static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
524 g_return_val_if_fail (pipeline_description != NULL, NULL);
526 GST_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
527 pipeline_description);
529 /* the need for the mutex will go away with flex 2.5.6 */
530 g_static_mutex_lock (&flex_lock);
531 graph = _gst_parse_launch (pipeline_description, error);
532 g_static_mutex_unlock (&flex_lock);
537 return pipeline_from_graph (graph, error);