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