author | hgs |
Fri, 30 Apr 2010 19:11:56 -0500 | |
changeset 19 | 24ed0baaf8e5 |
parent 16 | 8e837d1bf446 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* 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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* 2008 Tim-Philipp Müller <tim centricular net> |
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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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|
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/** |
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* SECTION:gstparse |
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* @short_description: Get a pipeline from a text pipeline description |
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* |
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* These function allow to create a pipeline based on the syntax used in the |
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* gst-launch utility. |
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*/ |
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#include "gst_private.h" |
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#include <string.h> |
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#include "gstparse.h" |
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#include "gsterror.h" |
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#include "gstinfo.h" |
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extern GstElement *_gst_parse_launch (const gchar *, GError **, |
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GstParseContext *, GstParseFlags); |
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/** |
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* gst_parse_error_quark: |
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* |
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* Get the error quark used by the parsing subsystem. |
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* |
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* Returns: the quark of the parse errors. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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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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/** |
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* gst_parse_context_new: |
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* |
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* Allocates a parse context for use with gst_parse_launch_full() or |
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* gst_parse_launchv_full(). |
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* |
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* Returns: a newly-allocated parse context. Free with gst_parse_context_free() |
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* when no longer needed. |
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* |
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* Since: 0.10.20 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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GstParseContext * |
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gst_parse_context_new (void) |
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{ |
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#ifndef GST_DISABLE_PARSE |
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GstParseContext *ctx; |
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ctx = g_slice_new (GstParseContext); |
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ctx->missing_elements = NULL; |
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return ctx; |
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#else |
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return NULL; |
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#endif |
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} |
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/** |
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* gst_parse_context_free: |
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* @context: a #GstParseContext |
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* |
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* Frees a parse context previously allocated with gst_parse_context_new(). |
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* |
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* Since: 0.10.20 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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void |
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gst_parse_context_free (GstParseContext * context) |
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{ |
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#ifndef GST_DISABLE_PARSE |
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if (context) { |
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g_list_foreach (context->missing_elements, (GFunc) g_free, NULL); |
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g_list_free (context->missing_elements); |
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g_slice_free (GstParseContext, context); |
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} |
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#endif |
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} |
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/** |
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* gst_parse_context_get_missing_elements: |
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* @context: a #GstParseContext |
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* |
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* Retrieve missing elements from a previous run of gst_parse_launch_full() |
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* or gst_parse_launchv_full(). Will only return results if an error code |
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* of %GST_PARSE_ERROR_NO_SUCH_ELEMENT was returned. |
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* |
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* Returns: a NULL-terminated array of element factory name strings of |
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* missing elements. Free with g_strfreev() when no longer needed. |
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* |
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* Since: 0.10.20 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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gchar ** |
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gst_parse_context_get_missing_elements (GstParseContext * context) |
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{ |
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#ifndef GST_DISABLE_PARSE |
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gchar **arr; |
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GList *l; |
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guint len, i; |
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g_return_val_if_fail (context != NULL, NULL); |
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len = g_list_length (context->missing_elements); |
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if (G_UNLIKELY (len == 0)) |
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return NULL; |
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arr = g_new (gchar *, len + 1); |
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for (i = 0, l = context->missing_elements; l != NULL; l = l->next, ++i) |
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arr[i] = g_strdup (l->data); |
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arr[i] = NULL; |
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return arr; |
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#else |
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return NULL; |
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#endif |
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} |
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#ifndef GST_DISABLE_PARSE |
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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 g_string_free (gstr, FALSE); |
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} |
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#endif /* !GST_DISABLE_PARSE */ |
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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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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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200 |
|
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GstElement * |
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gst_parse_launchv (const gchar ** argv, GError ** error) |
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{ |
16 | 204 |
return gst_parse_launchv_full (argv, NULL, 0, error); |
205 |
} |
|
206 |
||
207 |
/** |
|
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* gst_parse_launchv_full: |
|
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* @argv: null-terminated array of arguments |
|
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* @context: a parse context allocated with gst_parse_context_new(), or %NULL |
|
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* @flags: parsing options, or #GST_PARSE_FLAG_NONE |
|
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* @error: pointer to a #GError (which must be initialised to %NULL) |
|
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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 erroneous 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; on failure, either %NULL or a |
|
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* partially-constructed bin or element will be returned and @error will be set |
|
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* (unless you passed #GST_PARSE_FLAG_FATAL_ERRORS in @flags, then %NULL will |
|
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* always be returned on failure) |
|
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* |
|
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* Since: 0.10.20 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
|
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#endif |
|
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||
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GstElement * |
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gst_parse_launchv_full (const gchar ** argv, GstParseContext * context, |
|
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GstParseFlags flags, GError ** error) |
|
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{ |
|
0
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#ifndef GST_DISABLE_PARSE |
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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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238 |
|
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g_return_val_if_fail (argv != NULL, NULL); |
16 | 240 |
g_return_val_if_fail (error == NULL || *error == NULL, NULL); |
0
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241 |
|
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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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244 |
|
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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_c (str, ' '); |
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argvp++; |
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} |
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254 |
|
16 | 255 |
element = gst_parse_launch_full (str->str, context, flags, error); |
0
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256 |
|
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g_string_free (str, TRUE); |
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258 |
|
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return element; |
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#else |
16 | 261 |
/* gst_parse_launch_full() will set a GST_CORE_ERROR_DISABLED error for us */ |
262 |
return gst_parse_launch_full ("", NULL, 0, error); |
|
0
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#endif |
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} |
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265 |
|
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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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|
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* element is specified by the @pipeline_description, all elements are put into |
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* a #GstPipeline, which than is returned. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
283 |
|
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GstElement * |
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gst_parse_launch (const gchar * pipeline_description, GError ** error) |
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{ |
16 | 287 |
return gst_parse_launch_full (pipeline_description, NULL, 0, error); |
288 |
} |
|
289 |
||
290 |
/** |
|
291 |
* gst_parse_launch_full: |
|
292 |
* @pipeline_description: the command line describing the pipeline |
|
293 |
* @context: a parse context allocated with gst_parse_context_new(), or %NULL |
|
294 |
* @flags: parsing options, or #GST_PARSE_FLAG_NONE |
|
295 |
* @error: the error message in case of an erroneous pipeline. |
|
296 |
* |
|
297 |
* Create a new pipeline based on command line syntax. |
|
298 |
* Please note that you might get a return value that is not %NULL even though |
|
299 |
* the @error is set. In this case there was a recoverable parsing error and you |
|
300 |
* can try to play the pipeline. |
|
301 |
* |
|
302 |
* Returns: a new element on success, %NULL on failure. If more than one toplevel |
|
303 |
* element is specified by the @pipeline_description, all elements are put into |
|
304 |
* a #GstPipeline, which then is returned. |
|
305 |
* |
|
306 |
* Since: 0.10.20 |
|
307 |
*/ |
|
308 |
#ifdef __SYMBIAN32__ |
|
309 |
EXPORT_C |
|
310 |
#endif |
|
311 |
||
312 |
GstElement * |
|
313 |
gst_parse_launch_full (const gchar * pipeline_description, |
|
314 |
GstParseContext * context, GstParseFlags flags, GError ** error) |
|
315 |
{ |
|
0
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#ifndef GST_DISABLE_PARSE |
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GstElement *element; |
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318 |
|
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|
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g_return_val_if_fail (pipeline_description != NULL, NULL); |
16 | 320 |
g_return_val_if_fail (error == NULL || *error == NULL, NULL); |
0
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321 |
|
16 | 322 |
GST_CAT_INFO (GST_CAT_PIPELINE, "parsing pipeline description '%s'", |
0
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pipeline_description); |
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|
324 |
|
16 | 325 |
element = _gst_parse_launch (pipeline_description, error, context, flags); |
326 |
||
327 |
/* don't return partially constructed pipeline if FATAL_ERRORS was given */ |
|
328 |
if (G_UNLIKELY (error != NULL && *error != NULL && element != NULL)) { |
|
329 |
if ((flags & GST_PARSE_FLAG_FATAL_ERRORS)) { |
|
330 |
gst_object_unref (element); |
|
331 |
element = NULL; |
|
332 |
} |
|
333 |
} |
|
0
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|
334 |
|
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return element; |
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#else |
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gchar *msg; |
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338 |
|
16 | 339 |
GST_WARNING ("Disabled API called"); |
0
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340 |
|
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msg = gst_error_get_message (GST_CORE_ERROR, GST_CORE_ERROR_DISABLED); |
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g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_DISABLED, "%s", msg); |
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g_free (msg); |
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|
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return NULL; |
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#endif |
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} |