2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
5 * gstformat.c: GstFormat registration
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
27 #include "gstformat.h"
29 static GList *_gst_formats = NULL;
30 static GHashTable *_nick_to_format = NULL;
31 static GHashTable *_format_to_nick = NULL;
32 static gint _n_values = 1; /* we start from 1 because 0 reserved for UNDEFINED */
34 static GstFormatDefinition standard_definitions[] = {
35 { GST_FORMAT_DEFAULT, "default", "Default" },
36 { GST_FORMAT_BYTES, "bytes", "Bytes" },
37 { GST_FORMAT_TIME, "time", "Time" },
38 { GST_FORMAT_BUFFERS, "buffers", "Buffers" },
39 { GST_FORMAT_PERCENT, "percent", "Percent" },
40 { GST_FORMAT_UNITS, "units", "Units as defined by the media type" },
45 _gst_format_initialize (void)
47 GstFormatDefinition *standards = standard_definitions;
49 if (_nick_to_format == NULL) {
50 _nick_to_format = g_hash_table_new (g_str_hash, g_str_equal);
51 _format_to_nick = g_hash_table_new (NULL, NULL);
54 while (standards->nick) {
55 g_hash_table_insert (_nick_to_format, standards->nick, standards);
56 g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (standards->value), standards);
58 _gst_formats = g_list_append (_gst_formats, standards);
65 * gst_format_register:
66 * @nick: The nick of the new format
67 * @description: The description of the new format
69 * Create a new GstFormat based on the nick or return an
70 * allrady registered format with that nick
72 * Returns: A new GstFormat or an already registered format
76 gst_format_register (const gchar *nick, const gchar *description)
78 GstFormatDefinition *format;
81 g_return_val_if_fail (nick != NULL, 0);
82 g_return_val_if_fail (description != NULL, 0);
84 query = gst_format_get_by_nick (nick);
85 if (query != GST_FORMAT_UNDEFINED)
88 format = g_new0 (GstFormatDefinition, 1);
89 format->value = _n_values;
90 format->nick = g_strdup (nick);
91 format->description = g_strdup (description);
93 g_hash_table_insert (_nick_to_format, format->nick, format);
94 g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (format->value), format);
95 _gst_formats = g_list_append (_gst_formats, format);
102 * gst_format_get_by_nick:
103 * @nick: The nick of the format
105 * Return the format registered with the given nick.
107 * Returns: The format with @nick or GST_FORMAT_UNDEFINED
108 * if the format was not registered.
111 gst_format_get_by_nick (const gchar *nick)
113 GstFormatDefinition *format;
115 g_return_val_if_fail (nick != NULL, 0);
117 format = g_hash_table_lookup (_nick_to_format, nick);
120 return format->value;
122 return GST_FORMAT_UNDEFINED;
126 * gst_format_get_details:
127 * @format: The format to get details of
129 * Get details about the given format.
131 * Returns: The #GstFormatDefinition for @format or NULL on failure.
133 const GstFormatDefinition*
134 gst_format_get_details (GstFormat format)
136 return g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format));
140 * gst_format_get_definitions:
142 * Get a list of all the registered formats.
144 * Returns: A GList of #GstFormatDefinition.
147 gst_format_get_definitions (void)