2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
6 * gstformat.c: GstFormat registration
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
26 #include "gst_private.h"
27 #include "gstformat.h"
29 static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
30 static GList *_gst_formats = NULL;
31 static GHashTable *_nick_to_format = NULL;
32 static GHashTable *_format_to_nick = NULL;
33 static guint32 _n_values = 1; /* we start from 1 because 0 reserved for UNDEFINED */
35 static GstFormatDefinition standard_definitions[] = {
36 {GST_FORMAT_DEFAULT, "default", "Default format for the media type"},
37 {GST_FORMAT_BYTES, "bytes", "Bytes"},
38 {GST_FORMAT_TIME, "time", "Time"},
39 {GST_FORMAT_BUFFERS, "buffers", "Buffers"},
40 {GST_FORMAT_PERCENT, "percent", "Percent"},
45 _gst_format_initialize (void)
47 GstFormatDefinition *standards = standard_definitions;
49 g_static_mutex_lock (&mutex);
50 if (_nick_to_format == NULL) {
51 _nick_to_format = g_hash_table_new (g_str_hash, g_str_equal);
52 _format_to_nick = g_hash_table_new (NULL, NULL);
55 while (standards->nick) {
56 g_hash_table_insert (_nick_to_format, standards->nick, standards);
57 g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (standards->value),
60 _gst_formats = g_list_append (_gst_formats, standards);
64 g_static_mutex_unlock (&mutex);
68 * gst_format_register:
69 * @nick: The nick of the new format
70 * @description: The description of the new format
72 * Create a new GstFormat based on the nick or return an
73 * already registered format with that nick.
75 * Returns: A new GstFormat or an already registered format
81 gst_format_register (const gchar * nick, const gchar * description)
83 GstFormatDefinition *format;
86 g_return_val_if_fail (nick != NULL, 0);
87 g_return_val_if_fail (description != NULL, 0);
89 query = gst_format_get_by_nick (nick);
90 if (query != GST_FORMAT_UNDEFINED)
93 format = g_new0 (GstFormatDefinition, 1);
94 format->value = _n_values;
95 format->nick = g_strdup (nick);
96 format->description = g_strdup (description);
98 g_static_mutex_lock (&mutex);
99 g_hash_table_insert (_nick_to_format, format->nick, format);
100 g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (format->value),
102 _gst_formats = g_list_append (_gst_formats, format);
104 g_static_mutex_unlock (&mutex);
106 return format->value;
110 * gst_format_get_by_nick:
111 * @nick: The nick of the format
113 * Return the format registered with the given nick.
115 * Returns: The format with @nick or GST_FORMAT_UNDEFINED
116 * if the format was not registered.
119 gst_format_get_by_nick (const gchar * nick)
121 GstFormatDefinition *format;
123 g_return_val_if_fail (nick != NULL, 0);
125 g_static_mutex_lock (&mutex);
126 format = g_hash_table_lookup (_nick_to_format, nick);
127 g_static_mutex_unlock (&mutex);
130 return format->value;
132 return GST_FORMAT_UNDEFINED;
136 * gst_formats_contains:
137 * @formats: The format array to search
138 * @format: the format to find
140 * See if the given format is inside the format array.
142 * Returns: TRUE if the format is found inside the array
145 gst_formats_contains (const GstFormat * formats, GstFormat format)
151 if (*formats == format)
161 * gst_format_get_details:
162 * @format: The format to get details of
164 * Get details about the given format.
166 * Returns: The #GstFormatDefinition for @format or NULL on failure.
170 const GstFormatDefinition *
171 gst_format_get_details (GstFormat format)
173 const GstFormatDefinition *result;
175 g_static_mutex_lock (&mutex);
176 result = g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format));
177 g_static_mutex_unlock (&mutex);
183 * gst_format_iterate_definitions:
185 * Iterate all the registered formats. The format definition is read
188 * Returns: A GstIterator of #GstFormatDefinition.
191 gst_format_iterate_definitions (void)
195 g_static_mutex_lock (&mutex);
196 result = gst_iterator_new_list (g_static_mutex_get_mutex (&mutex),
197 &_n_values, &_gst_formats, NULL, NULL, NULL);
198 g_static_mutex_unlock (&mutex);