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.
25 * @short_description: Get a pipeline from a text pipeline description
27 * These function allow to create a pipeline based on the syntax used in the
28 * gst-launch utillity.
33 #include "gst_private.h"
38 extern GstElement *_gst_parse_launch (const gchar *, GError **);
41 gst_parse_error_quark (void)
43 static GQuark quark = 0;
46 quark = g_quark_from_static_string ("gst_parse_error");
51 _gst_parse_escape (const gchar * str)
56 g_return_val_if_fail (str != NULL, NULL);
58 gstr = g_string_sized_new (strlen (str));
62 g_string_append_c (gstr, '\\');
63 g_string_append_c (gstr, *str);
68 g_string_free (gstr, FALSE);
75 * @argv: null-terminated array of arguments
76 * @error: pointer to a #GError
78 * Create a new element based on command line syntax.
79 * @error will contain an error message if an erroneuos pipeline is specified.
80 * An error does not mean that the pipeline could not be constructed.
82 * Returns: a new element on success and %NULL on failure.
85 gst_parse_launchv (const gchar ** argv, GError ** error)
89 const gchar **argvp, *arg;
92 g_return_val_if_fail (argv != NULL, NULL);
94 /* let's give it a nice size. */
95 str = g_string_sized_new (1024);
100 tmp = _gst_parse_escape (arg);
101 g_string_append (str, tmp);
103 g_string_append (str, " ");
107 element = gst_parse_launch (str->str, error);
109 g_string_free (str, TRUE);
116 * @pipeline_description: the command line describing the pipeline
117 * @error: the error message in case of an erroneous pipeline.
119 * Create a new pipeline based on command line syntax.
120 * Please note that you might get a return value that is not %NULL even though
121 * the @error is set. In this case there was a recoverable parsing error and you
122 * can try to play the pipeline.
124 * Returns: a new element on success, %NULL on failure. If more than one toplevel
125 * element is specified by the @pipeline_description, all elements are put into
126 * a #GstPipeline, which than is returned.
129 gst_parse_launch (const gchar * pipeline_description, GError ** error)
132 static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
134 g_return_val_if_fail (pipeline_description != NULL, NULL);
136 GST_CAT_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
137 pipeline_description);
139 /* the need for the mutex will go away with flex 2.5.6 */
140 g_static_mutex_lock (&flex_lock);
141 element = _gst_parse_launch (pipeline_description, error);
142 g_static_mutex_unlock (&flex_lock);