gstreamer/gst/gstparse.c
Marc-Andre Lureau 7a3a27d0c1 gst/parse/: Make the parser reentrant and recursively callable. This requires flex >= 2.5.31, for older versions preg...
Original commit message from CVS:
Patch by: Marc-Andre Lureau <marcandre dot lureau at gmail dot com>
* gst/parse/Makefile.am:
* gst/parse/grammar.y:
* gst/parse/parse.l:
Make the parser reentrant and recursively callable. This requires flex
>= 2.5.31, for older versions pregenerated sources are used as we
can't bump the build dependency. Finally fixes #349180.
* gst/gstparse.c: (gst_parse_launch):
Drop the HAVE_MT_SAVE_FLEX #ifdefs as we always use a new enough flex
now anyway.
* docs/gst/Makefile.am:
* docs/gst/Makefile.am:
* gst/parse/grammar.tab.pre.c: (__gst_parse_strdup),
(__gst_parse_strfree), (__gst_parse_link_new),
(__gst_parse_link_free), (__gst_parse_chain_new),
(__gst_parse_chain_free), (SET_ERROR), (YYPRINTF),
(gst_parse_element_set), (gst_parse_free_link),
(gst_parse_found_pad), (gst_parse_perform_delayed_link),
(gst_parse_perform_link), (yytnamerr), (yysyntax_error), (yyerror),
(_gst_parse_launch):
* gst/parse/grammar.tab.pre.h:
* gst/parse/lex._gst_parse_yy.pre.c: (PRINT), (yy_get_next_buffer),
(yy_get_previous_state), (yy_try_NUL_trans), (input),
(_gst_parse_yyrestart), (_gst_parse_yy_switch_to_buffer),
(_gst_parse_yy_load_buffer_state), (_gst_parse_yy_create_buffer),
(_gst_parse_yy_delete_buffer), (_gst_parse_yy_init_buffer),
(_gst_parse_yy_flush_buffer), (_gst_parse_yypush_buffer_state),
(_gst_parse_yypop_buffer_state),
(_gst_parse_yyensure_buffer_stack), (_gst_parse_yy_scan_buffer),
(_gst_parse_yy_scan_string), (_gst_parse_yy_scan_bytes),
(yy_fatal_error), (_gst_parse_yyget_extra),
(_gst_parse_yyget_lineno), (_gst_parse_yyget_column),
(_gst_parse_yyget_in), (_gst_parse_yyget_out),
(_gst_parse_yyget_leng), (_gst_parse_yyget_text),
(_gst_parse_yyset_extra), (_gst_parse_yyset_lineno),
(_gst_parse_yyset_column), (_gst_parse_yyset_in),
(_gst_parse_yyset_out), (_gst_parse_yyget_debug),
(_gst_parse_yyset_debug), (_gst_parse_yyget_lval),
(_gst_parse_yyset_lval), (_gst_parse_yylex_init),
(yy_init_globals), (_gst_parse_yylex_destroy), (yy_flex_strncpy),
(yy_flex_strlen), (_gst_parse_yyalloc), (_gst_parse_yyrealloc),
(_gst_parse_yyfree):
If the installed flex version is too old use pre-generated parser
sources. These pre-generated parser sources are always updated when
the actual flex/bison sources change but require everybody who wants
to change something in the parser to have flex >= 2.5.31 installed.
2007-04-18 12:34:51 +00:00

151 lines
3.9 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.
*/
/**
* SECTION:gstparse
* @short_description: Get a pipeline from a text pipeline description
*
* These function allow to create a pipeline based on the syntax used in the
* gst-launch utillity.
*/
#include "gst_private.h"
#include <string.h>
#include "gstparse.h"
#include "gstinfo.h"
extern GstElement *_gst_parse_launch (const gchar *, GError **);
/**
* gst_parse_error_quark:
*
* Get the error quark used by the parsing subsystem.
*
* Returns: the quark of the parse errors.
*/
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;
gchar *newstr = 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++;
}
newstr = gstr->str;
g_string_free (gstr, FALSE);
return newstr;
}
/**
* 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, which than is returned.
*/
GstElement *
gst_parse_launch (const gchar * pipeline_description, GError ** error)
{
GstElement *element;
g_return_val_if_fail (pipeline_description != NULL, NULL);
GST_CAT_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
pipeline_description);
element = _gst_parse_launch (pipeline_description, error);
return element;
/* ERRORS */
}