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 GstPadTemplate *templ = gst_pad_get_pad_template (newpad);
67 /* see if this is the one */
68 if (strcmp (gst_pad_get_name (newpad), dc->srcpadname) &&
69 strcmp (gst_object_get_name (GST_OBJECT (templ)), dc->srcpadname)) {
74 /* try to find a target pad if we don't know it yet */
75 if (!dc->target_pad) {
76 if (!GST_PAD_IS_CONNECTED (newpad)) {
77 dc->target_pad = gst_element_get_compatible_pad (dc->target_element, newpad);
84 if (!GST_PAD_IS_CONNECTED (dc->target_pad) && !GST_PAD_IS_CONNECTED (newpad)) {
85 gst_element_set_state (dc->pipeline, GST_STATE_PAUSED);
86 if (!gst_pad_connect (newpad, dc->target_pad) && warn) {
87 g_warning ("could not connect %s:%s to %s:%s", GST_DEBUG_PAD_NAME (newpad),
88 GST_DEBUG_PAD_NAME (dc->target_pad));
90 gst_element_set_state (dc->pipeline, GST_STATE_PLAYING);
95 make_elements (graph_t *g, GError **error)
101 if (!(g->bins || g->elements)) {
104 GST_PARSE_ERROR_SYNTAX,
109 if (g->current_bin_type)
110 bin_type = g->current_bin_type;
112 bin_type = "pipeline";
114 if (!(g->bin = gst_element_factory_make (bin_type, NULL))) {
117 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
118 "No such bin type %s", bin_type);
124 e = (element_t*)l->data;
125 if (!(e->element = gst_element_factory_make (e->type, NULL))) {
128 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
129 "No such element %s", e->type);
132 gst_bin_add (GST_BIN (g->bin), e->element);
138 if (!make_elements ((graph_t*)l->data, error))
140 gst_bin_add (GST_BIN (g->bin), ((graph_t*)l->data)->bin);
148 set_properties (graph_t *g, GError **error)
157 e = (element_t*)l->data;
158 l2 = e->property_values;
160 p = (property_t*)l2->data;
161 if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (e->element), p->name))) {
162 g_object_set_property (G_OBJECT (e->element), p->name, p->value);
166 GST_PARSE_ERROR_NO_SUCH_PROPERTY,
167 "No such property '%s' in element '%s'",
168 p->name, GST_OBJECT_NAME (GST_OBJECT (e->element)));
171 l2 = g_list_next (l2);
178 if (!set_properties ((graph_t*)l->data, error))
187 find_element_by_index_recurse (graph_t *g, gint i)
195 e = (element_t*)l->data;
204 if ((element = find_element_by_index_recurse ((graph_t*)l->data, i)))
213 find_element_by_index (graph_t *g, gint i)
218 return find_element_by_index_recurse (g, i);
222 make_connections (graph_t *g, GError **error)
226 dynamic_connection_t *dc;
227 GstElement *src, *sink;
229 GstPadTemplate *pt1, *pt2;
233 c = (connection_t*)l->data;
235 if (!(src = gst_bin_get_by_name (GST_BIN (g->bin), c->src_name))) {
238 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
239 "No such element '%s'",
244 src = find_element_by_index (g, c->src_index);
248 if (!(sink = gst_bin_get_by_name (GST_BIN (g->bin), c->sink_name))) {
251 GST_PARSE_ERROR_NO_SUCH_ELEMENT,
252 "No such element '%s'",
257 sink = find_element_by_index (g, c->sink_index);
263 /* g_print ("a: %p, b: %p\n", a, b); */
265 /* balanced multipad connection */
267 p1 = gst_element_get_pad (src, (gchar*)a->data);
268 p2 = gst_element_get_pad (sink, (gchar*)b->data);
271 goto could_not_get_pad_b;
273 if (!p1 && p2 && (pt1 = gst_element_get_pad_template (src, (gchar*)a->data)) &&
274 pt1->presence == GST_PAD_SOMETIMES) {
275 dc = g_new0 (dynamic_connection_t, 1);
276 dc->srcpadname = (gchar*)a->data;
278 dc->target_element = sink;
279 dc->pipeline = g->bin;
281 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
282 GST_OBJECT_NAME (GST_OBJECT (src)),
283 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
285 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
287 goto could_not_get_pad_a;
288 } else if (!gst_pad_connect (p1, p2)) {
289 goto could_not_connect_pads;
295 if ((pt1 = gst_element_get_pad_template (src, (gchar*)a->data))) {
296 if ((p1 = gst_element_get_pad (src, (gchar*)a->data)) || pt1->presence == GST_PAD_SOMETIMES) {
298 /* sigh, a hack until i fix the gstelement api... */
299 if ((pt2 = gst_element_get_compatible_pad_template (sink, pt1))) {
300 if ((p2 = gst_element_get_pad (sink, pt2->name_template))) {
301 dc = g_new0 (dynamic_connection_t, 1);
302 dc->srcpadname = (gchar*)a->data;
304 dc->target_element = NULL;
305 dc->pipeline = g->bin;
307 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
308 GST_OBJECT_NAME (GST_OBJECT (src)),
309 (gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
311 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
314 /* both pt1 and pt2 are sometimes templates. sheesh. */
315 goto both_templates_have_sometimes_presence;
318 /* if the target pad has no padtemplate we will figure out a target
320 dc = g_new0 (dynamic_connection_t, 1);
321 dc->srcpadname = (gchar*)a->data;
322 dc->target_pad = NULL;
323 dc->target_element = sink;
324 dc->pipeline = g->bin;
326 GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s, and some pad in %s",
327 GST_OBJECT_NAME (GST_OBJECT (src)),
328 (gchar*)a->data, GST_OBJECT_NAME (sink));
330 g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
334 goto could_not_get_compatible_to_a;
337 goto could_not_get_pad_a;
340 goto could_not_get_pad_a;
343 if (!gst_pad_connect (p1, p2)) {
344 goto could_not_connect_pads;
347 /* we don't support dynamic connections on this side yet, if ever */
348 if (!(p2 = gst_element_get_pad (sink, (gchar*)b->data))) {
349 goto could_not_get_pad_b;
351 if (!(p1 = gst_element_get_compatible_pad (src, p2))) {
352 goto could_not_get_compatible_to_b;
354 if (!gst_pad_connect (p1, p2)) {
355 goto could_not_connect_pads;
358 if (!gst_element_connect (src, sink)) {
359 goto could_not_connect_elements;
368 if (!make_connections ((graph_t*)l->data, error))
378 GST_PARSE_ERROR_CONNECT,
379 "Could not get a pad %s from element %s",
380 (gchar*)a->data, GST_OBJECT_NAME (src));
385 GST_PARSE_ERROR_CONNECT,
386 "Could not get a pad %s from element %s",
387 (gchar*)b->data, GST_OBJECT_NAME (sink));
389 could_not_get_compatible_to_a:
392 GST_PARSE_ERROR_CONNECT,
393 "Could not find a compatible pad in element %s to for %s:%s",
394 GST_OBJECT_NAME (sink), GST_OBJECT_NAME (src), (gchar*)a->data);
396 could_not_get_compatible_to_b:
399 GST_PARSE_ERROR_CONNECT,
400 "Could not find a compatible pad in element %s to for %s:%s",
401 GST_OBJECT_NAME (src), GST_OBJECT_NAME (sink), (gchar*)b->data);
403 both_templates_have_sometimes_presence:
406 GST_PARSE_ERROR_CONNECT,
407 "Both %s:%s and %s:%s have GST_PAD_SOMETIMES presence, operation not supported",
408 GST_OBJECT_NAME (src), pt1->name_template, GST_OBJECT_NAME (sink), pt2->name_template);
410 could_not_connect_pads:
413 GST_PARSE_ERROR_CONNECT,
414 "Could not connect %s:%s to %s:%s",
415 GST_DEBUG_PAD_NAME (p1),
416 GST_DEBUG_PAD_NAME (p2));
418 could_not_connect_elements:
421 GST_PARSE_ERROR_CONNECT,
422 "Could not connect element %s to %s",
423 GST_OBJECT_NAME (src),
424 GST_OBJECT_NAME (sink));
429 pipeline_from_graph (graph_t *g, GError **error)
431 if (!make_elements (g, error))
434 if (!set_properties (g, error))
437 if (!make_connections (g, error))
440 return (GstBin*)g->bin;
445 * @argv: null-terminated array of arguments
446 * @error: pointer to GError
448 * Create a new pipeline based on command line syntax.
450 * Returns: a new pipeline on success, NULL on failure and error
451 * will contain the error message.
454 gst_parse_launchv (const gchar **argv, GError **error)
458 const gchar **argvp, *arg;
461 g_return_val_if_fail (argv != NULL, NULL);
463 /* let's give it a nice size. */
464 str = g_string_sized_new (1024);
469 tmp = _gst_parse_escape (arg);
470 g_string_append (str, tmp);
472 g_string_append (str, " ");
476 pipeline = gst_parse_launch (str->str, error);
478 g_string_free (str, TRUE);
483 gchar *_gst_parse_escape (const gchar *str)
485 GString *gstr = NULL;
487 g_return_val_if_fail (str != NULL, NULL);
489 gstr = g_string_sized_new (strlen (str));
493 g_string_append_c (gstr, '\\');
494 g_string_append_c (gstr, *str);
501 void _gst_parse_unescape (gchar *str)
505 g_return_if_fail (str != NULL);
521 * @pipeline_description: the command line describing the pipeline
522 * @error: the error message in case of a failure
524 * Create a new pipeline based on command line syntax.
526 * Returns: a new bin on success, NULL on failure. By default the bin is
527 * a GstPipeline, but it depends on the pipeline_description.
530 gst_parse_launch (const gchar * pipeline_description, GError **error)
533 static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
535 g_return_val_if_fail (pipeline_description != NULL, NULL);
537 GST_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
538 pipeline_description);
540 /* the need for the mutex will go away with flex 2.5.6 */
541 g_static_mutex_lock (&flex_lock);
542 graph = _gst_parse_launch (pipeline_description, error);
543 g_static_mutex_unlock (&flex_lock);
548 return pipeline_from_graph (graph, error);