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.
29 #include "parse/types.h"
31 typedef struct _gst_parse_delayed_pad gst_parse_delayed_pad;
32 struct _gst_parse_delayed_pad
42 GstElement *target_element;
49 gst_parse_error_quark (void)
51 static GQuark quark = 0;
53 quark = g_quark_from_static_string ("gst_parse_error");
57 G_GNUC_UNUSED static void
58 dynamic_connect (GstElement * element, GstPad * newpad, gpointer data)
60 dynamic_connection_t *dc = (dynamic_connection_t *) data;
63 /* do we know the exact srcpadname? */
65 /* see if this is the one */
66 if (strcmp (gst_pad_get_name (newpad), dc->srcpadname)) {
71 /* try to find a target pad if we don't know it yet */
72 if (!dc->target_pad) {
73 if (!GST_PAD_IS_CONNECTED (newpad)) {
74 dc->target_pad = gst_element_get_compatible_pad (dc->target_element, newpad);
81 if (!GST_PAD_IS_CONNECTED (dc->target_pad) && !GST_PAD_IS_CONNECTED (newpad)) {
82 gst_element_set_state (dc->pipeline, GST_STATE_PAUSED);
83 if (!gst_pad_connect (newpad, dc->target_pad) && warn) {
84 g_warning ("could not connect %s:%s to %s:%s", GST_DEBUG_PAD_NAME (newpad),
85 GST_DEBUG_PAD_NAME (dc->target_pad));
87 gst_element_set_state (dc->pipeline, GST_STATE_PLAYING);
92 make_elements (graph_t *g, GError **error)
98 if (!(g->bins || g->elements)) {
101 GST_PARSE_ERROR_SYNTAX,
106 if (g->current_bin_type)
107 bin_type = g->current_bin_type;
109 bin_type = "pipeline";
111 if (!(g->bin = gst_element_factory_make (bin_type, NULL))) {
114 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
115 "No such bin type %s", bin_type);
121 e = (element_t*)l->data;
122 if (!(e->element = gst_element_factory_make (e->type, NULL))) {
125 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
126 "No such element %s", e->type);
129 gst_bin_add (GST_BIN (g->bin), e->element);
135 if (!make_elements ((graph_t*)l->data, error))
137 gst_bin_add (GST_BIN (g->bin), ((graph_t*)l->data)->bin);
145 set_properties (graph_t *g, GError **error)
154 e = (element_t*)l->data;
155 l2 = e->property_values;
157 p = (property_t*)l2->data;
158 if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (e->element), p->name))) {
159 g_object_set_property (G_OBJECT (e->element), p->name, p->value);
163 GST_PARSE_ERROR_NO_SUCH_PROPERTY,
164 "No such property '%s' in element '%s'",
165 p->name, GST_OBJECT_NAME (GST_OBJECT (e->element)));
168 l2 = g_list_next (l2);
175 if (!set_properties ((graph_t*)l->data, error))
184 find_element_by_index_recurse (graph_t *g, gint i)
192 e = (element_t*)l->data;
201 if ((element = find_element_by_index_recurse ((graph_t*)l->data, i)))
210 find_element_by_index (graph_t *g, gint i)
215 return find_element_by_index_recurse (g, i);
219 make_connections (graph_t *g, GError **error)
223 dynamic_connection_t *dc;
224 GstElement *src, *sink;
226 GstPadTemplate *pt1, *pt2;
230 c = (connection_t*)l->data;
232 if (!(src = gst_bin_get_by_name (GST_BIN (g->bin), c->src_name))) {
235 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
236 "No such element '%s'",
241 src = find_element_by_index (g, c->src_index);
245 if (!(sink = gst_bin_get_by_name (GST_BIN (g->bin), c->sink_name))) {
248 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
249 "No such element '%s'",
254 sink = find_element_by_index (g, c->sink_index);
260 /* g_print ("a: %p, b: %p\n", a, b); */
262 /* balanced multipad connection */
264 p1 = gst_element_get_pad (src, (gchar*)a->data);
265 p2 = gst_element_get_pad (sink, (gchar*)b->data);
268 goto could_not_get_pad_b;
270 if (!p1 && p2 && (pt1 = gst_element_get_pad_template (src, (gchar*)a->data)) &&
271 pt1->presence == GST_PAD_SOMETIMES) {
272 dc = g_new0 (dynamic_connection_t, 1);
273 dc->srcpadname = (gchar*)a->data;
275 dc->target_element = sink;
276 dc->pipeline = g->bin;
278 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
279 GST_OBJECT_NAME (GST_OBJECT (src)),
280 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
282 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
284 goto could_not_get_pad_a;
285 } else if (!gst_pad_connect (p1, p2)) {
286 goto could_not_connect_pads;
292 if ((pt1 = gst_element_get_pad_template (src, (gchar*)a->data))) {
293 if ((p1 = gst_element_get_pad (src, (gchar*)a->data)) || pt1->presence == GST_PAD_SOMETIMES) {
295 /* sigh, a hack until i fix the gstelement api... */
296 if ((pt2 = gst_element_get_compatible_pad_template (sink, pt1))) {
297 if ((p2 = gst_element_get_pad (sink, pt2->name_template))) {
298 dc = g_new0 (dynamic_connection_t, 1);
299 dc->srcpadname = (gchar*)a->data;
301 dc->target_element = NULL;
302 dc->pipeline = g->bin;
304 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
305 GST_OBJECT_NAME (GST_OBJECT (src)),
306 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
308 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
311 /* both pt1 and pt2 are sometimes templates. sheesh. */
312 goto both_templates_have_sometimes_presence;
315 /* if the target pad has no padtemplate we will figure out a target
317 dc = g_new0 (dynamic_connection_t, 1);
318 dc->srcpadname = NULL;
319 dc->target_pad = NULL;
320 dc->target_element = sink;
321 dc->pipeline = g->bin;
323 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s, and some pad in %s",
324 GST_OBJECT_NAME (GST_OBJECT (src)),
325 (gchar*)a->data, GST_OBJECT_NAME (sink));
327 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
331 goto could_not_get_compatible_to_a;
334 goto could_not_get_pad_a;
337 goto could_not_get_pad_a;
340 if (!gst_pad_connect (p1, p2)) {
341 goto could_not_connect_pads;
344 /* we don't support dynamic connections on this side yet, if ever */
345 if (!(p2 = gst_element_get_pad (sink, (gchar*)b->data))) {
346 goto could_not_get_pad_b;
348 if (!(p1 = gst_element_get_compatible_pad (src, p2))) {
349 goto could_not_get_compatible_to_b;
351 if (!gst_pad_connect (p1, p2)) {
352 goto could_not_connect_pads;
355 if (!gst_element_connect (src, sink)) {
356 goto could_not_connect_elements;
365 if (!make_connections ((graph_t*)l->data, error))
375 GST_PARSE_ERROR_CONNECT,
376 "Could not get a pad %s from element %s",
377 (gchar*)a->data, GST_OBJECT_NAME (src));
382 GST_PARSE_ERROR_CONNECT,
383 "Could not get a pad %s from element %s",
384 (gchar*)b->data, GST_OBJECT_NAME (sink));
386 could_not_get_compatible_to_a:
389 GST_PARSE_ERROR_CONNECT,
390 "Could not find a compatible pad in element %s to for %s:%s",
391 GST_OBJECT_NAME (sink), GST_OBJECT_NAME (src), (gchar*)a->data);
393 could_not_get_compatible_to_b:
396 GST_PARSE_ERROR_CONNECT,
397 "Could not find a compatible pad in element %s to for %s:%s",
398 GST_OBJECT_NAME (src), GST_OBJECT_NAME (sink), (gchar*)b->data);
400 both_templates_have_sometimes_presence:
403 GST_PARSE_ERROR_CONNECT,
404 "Both %s:%s and %s:%s have GST_PAD_SOMETIMES presence, operation not supported",
405 GST_OBJECT_NAME (src), pt1->name_template, GST_OBJECT_NAME (sink), pt2->name_template);
407 could_not_connect_pads:
410 GST_PARSE_ERROR_CONNECT,
411 "Could not connect %s:%s to %s:%s",
412 GST_DEBUG_PAD_NAME (p1),
413 GST_DEBUG_PAD_NAME (p2));
415 could_not_connect_elements:
418 GST_PARSE_ERROR_CONNECT,
419 "Could not connect element %s to %s",
420 GST_OBJECT_NAME (src),
421 GST_OBJECT_NAME (sink));
426 pipeline_from_graph (graph_t *g, GError **error)
428 if (!make_elements (g, error))
431 if (!set_properties (g, error))
434 if (!make_connections (g, error))
437 return (GstBin*)g->bin;
442 * @argv: null-terminated array of arguments
443 * @error: pointer to GError
445 * Create a new pipeline based on command line syntax.
447 * Returns: a new pipeline on success, NULL on failure and error
448 * will contain the error message.
451 gst_parse_launchv (const gchar **argv, GError **error)
455 const gchar **argvp, *arg;
458 /* let's give it a nice size. */
459 str = g_string_sized_new (1024);
464 tmp = _gst_parse_escape (arg);
465 g_string_append (str, tmp);
467 g_string_append (str, " ");
471 pipeline = gst_parse_launch (str->str, error);
473 g_string_free (str, TRUE);
478 gchar *_gst_parse_escape (const gchar *str)
480 GString *gstr = NULL;
482 g_return_val_if_fail (str != NULL, NULL);
484 gstr = g_string_sized_new (strlen (str));
488 g_string_append_c (gstr, '\\');
489 g_string_append_c (gstr, *str);
496 void _gst_parse_unescape (gchar *str)
500 g_return_if_fail (str != NULL);
516 * @pipeline_description: the command line describing the pipeline
517 * @error: the error message in case of a failure
519 * Create a new pipeline based on command line syntax.
521 * Returns: a new bin on success, NULL on failure. By default the bin is
522 * a GstPipeline, but it depends on the pipeline_description.
525 gst_parse_launch (const gchar * pipeline_description, GError **error)
528 static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
530 g_return_val_if_fail (pipeline_description != NULL, NULL);
532 GST_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
533 pipeline_description);
535 /* the need for the mutex will go away with flex 2.5.6 */
536 g_static_mutex_lock (&flex_lock);
537 graph = _gst_parse_launch (pipeline_description, error);
538 g_static_mutex_unlock (&flex_lock);
543 return pipeline_from_graph (graph, error);