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.
26 #include "gst_private.h"
31 extern GstElement *_gst_parse_launch (const gchar *, GError **);
34 gst_parse_error_quark (void)
36 static GQuark quark = 0;
38 quark = g_quark_from_static_string ("gst_parse_error");
42 static gchar *_gst_parse_escape (const gchar *str)
46 g_return_val_if_fail (str != NULL, NULL);
48 gstr = g_string_sized_new (strlen (str));
52 g_string_append_c (gstr, '\\');
53 g_string_append_c (gstr, *str);
61 * @argv: null-terminated array of arguments
62 * @error: pointer to a #GError
64 * Create a new element based on command line syntax.
65 * #error will contain an error message if an erroneuos pipeline is specified.
66 * An error does not mean that the pipeline could not be constructed.
68 * Returns: a new element on success and NULL on failure.
71 gst_parse_launchv (const gchar **argv, GError **error)
75 const gchar **argvp, *arg;
78 g_return_val_if_fail (argv != NULL, NULL);
80 /* let's give it a nice size. */
81 str = g_string_sized_new (1024);
86 tmp = _gst_parse_escape (arg);
87 g_string_append (str, tmp);
89 g_string_append (str, " ");
93 element = gst_parse_launch (str->str, error);
95 g_string_free (str, TRUE);
102 * @pipeline_description: the command line describing the pipeline
103 * @error: the error message in case of an erroneous pipeline.
105 * Create a new pipeline based on command line syntax.
106 * Please note that you might get a return value that is not NULL even though
107 * the error is set. In this case there was a recoverable parsing error and you
108 * can try to play the pipeline.
110 * Returns: a new element on success, NULL on failure. If more than one toplevel
111 * element is specified by the pipeline_description, all elements are put into
112 * a #GstPipeline ant that is returned.
115 gst_parse_launch (const gchar * pipeline_description, GError **error)
118 static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
120 g_return_val_if_fail (pipeline_description != NULL, NULL);
122 GST_CAT_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
123 pipeline_description);
125 /* the need for the mutex will go away with flex 2.5.6 */
126 g_static_mutex_lock (&flex_lock);
127 element = _gst_parse_launch (pipeline_description, error);
128 g_static_mutex_unlock (&flex_lock);