mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-30 05:31:15 +00:00
134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2000 Wim Taymans <wtay@chello.be>
|
|
* 2002 Andy Wingo <wingo@pobox.com>
|
|
*
|
|
* gstparse.c: get a pipeline from a text pipeline description
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include "gst_private.h"
|
|
|
|
#include "gstparse.h"
|
|
#include "gstinfo.h"
|
|
|
|
extern GstElement *_gst_parse_launch (const gchar *, GError **);
|
|
|
|
GQuark
|
|
gst_parse_error_quark (void)
|
|
{
|
|
static GQuark quark = 0;
|
|
|
|
if (!quark)
|
|
quark = g_quark_from_static_string ("gst_parse_error");
|
|
return quark;
|
|
}
|
|
|
|
static gchar *
|
|
_gst_parse_escape (const gchar * str)
|
|
{
|
|
GString *gstr = NULL;
|
|
|
|
g_return_val_if_fail (str != NULL, NULL);
|
|
|
|
gstr = g_string_sized_new (strlen (str));
|
|
|
|
while (*str) {
|
|
if (*str == ' ')
|
|
g_string_append_c (gstr, '\\');
|
|
g_string_append_c (gstr, *str);
|
|
str++;
|
|
}
|
|
|
|
return gstr->str;
|
|
}
|
|
|
|
/**
|
|
* gst_parse_launchv:
|
|
* @argv: null-terminated array of arguments
|
|
* @error: pointer to a #GError
|
|
*
|
|
* Create a new element based on command line syntax.
|
|
* #error will contain an error message if an erroneuos pipeline is specified.
|
|
* An error does not mean that the pipeline could not be constructed.
|
|
*
|
|
* Returns: a new element on success and NULL on failure.
|
|
*/
|
|
GstElement *
|
|
gst_parse_launchv (const gchar ** argv, GError ** error)
|
|
{
|
|
GstElement *element;
|
|
GString *str;
|
|
const gchar **argvp, *arg;
|
|
gchar *tmp;
|
|
|
|
g_return_val_if_fail (argv != NULL, NULL);
|
|
|
|
/* let's give it a nice size. */
|
|
str = g_string_sized_new (1024);
|
|
|
|
argvp = argv;
|
|
while (*argvp) {
|
|
arg = *argvp;
|
|
tmp = _gst_parse_escape (arg);
|
|
g_string_append (str, tmp);
|
|
g_free (tmp);
|
|
g_string_append (str, " ");
|
|
argvp++;
|
|
}
|
|
|
|
element = gst_parse_launch (str->str, error);
|
|
|
|
g_string_free (str, TRUE);
|
|
|
|
return element;
|
|
}
|
|
|
|
/**
|
|
* gst_parse_launch:
|
|
* @pipeline_description: the command line describing the pipeline
|
|
* @error: the error message in case of an erroneous pipeline.
|
|
*
|
|
* Create a new pipeline based on command line syntax.
|
|
* Please note that you might get a return value that is not NULL even though
|
|
* the error is set. In this case there was a recoverable parsing error and you
|
|
* can try to play the pipeline.
|
|
*
|
|
* Returns: a new element on success, NULL on failure. If more than one toplevel
|
|
* element is specified by the pipeline_description, all elements are put into
|
|
* a #GstPipeline ant that is returned.
|
|
*/
|
|
GstElement *
|
|
gst_parse_launch (const gchar * pipeline_description, GError ** error)
|
|
{
|
|
GstElement *element;
|
|
static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
|
|
|
|
g_return_val_if_fail (pipeline_description != NULL, NULL);
|
|
|
|
GST_CAT_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
|
|
pipeline_description);
|
|
|
|
/* the need for the mutex will go away with flex 2.5.6 */
|
|
g_static_mutex_lock (&flex_lock);
|
|
element = _gst_parse_launch (pipeline_description, error);
|
|
g_static_mutex_unlock (&flex_lock);
|
|
|
|
return element;
|
|
}
|