2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #include <gst/gst_private.h>
21 #include <gst/gstversion.h>
22 #include <gst/gstplugin.h>
23 #include <gst/gstindex.h>
25 #define GST_TYPE_MEM_INDEX \
26 (gst_index_get_type ())
27 #define GST_MEM_INDEX(obj) \
28 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MEM_INDEX, GstMemIndex))
29 #define GST_MEM_INDEX_CLASS(klass) \
30 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MEM_INDEX, GstMemIndexClass))
31 #define GST_IS_MEM_INDEX(obj) \
32 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MEM_INDEX))
33 #define GST_IS_MEM_INDEX_CLASS(obj) \
34 (GST_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MEM_INDEX))
39 * All entries are simply added to a GList first. Then we build
40 * an index to each entry for each id/format
44 * -----------------------------...
54 * The memindex creates a MemIndexId object for each writer id, a
55 * Hashtable is kept to map the id to the MemIndexId
57 * The MemIndexId keeps a MemIndexFormatIndex for each format the
58 * specific writer wants indexed.
60 * The MemIndexFormatIndex keeps all the values of the particular
61 * format in a GTree, The values of the GTree point back to the entry.
63 * Finding a value for an id/format requires locating the correct GTree,
64 * then do a lookup in the Tree to get the required value.
71 } GstMemIndexFormatIndex;
75 GHashTable *format_index;
78 typedef struct _GstMemIndex GstMemIndex;
79 typedef struct _GstMemIndexClass GstMemIndexClass;
89 struct _GstMemIndexClass {
90 GstIndexClass parent_class;
93 /* Index signals and args */
103 static void gst_mem_index_class_init (GstMemIndexClass *klass);
104 static void gst_mem_index_init (GstMemIndex *index);
105 static void gst_mem_index_dispose (GObject *object);
107 static void gst_mem_index_add_entry (GstIndex *index, GstIndexEntry *entry);
108 static GstIndexEntry* gst_mem_index_get_assoc_entry (GstIndex *index, gint id,
109 GstIndexLookupMethod method, GstAssocFlags flags,
110 GstFormat format, gint64 value,
111 GCompareDataFunc func,
114 #define CLASS(mem_index) GST_MEM_INDEX_CLASS (G_OBJECT_GET_CLASS (mem_index))
116 static GstIndex *parent_class = NULL;
117 /*static guint gst_mem_index_signals[LAST_SIGNAL] = { 0 }; */
120 gst_mem_index_get_type(void) {
121 static GType mem_index_type = 0;
123 if (!mem_index_type) {
124 static const GTypeInfo mem_index_info = {
125 sizeof(GstMemIndexClass),
128 (GClassInitFunc)gst_mem_index_class_init,
133 (GInstanceInitFunc)gst_mem_index_init,
136 mem_index_type = g_type_register_static(GST_TYPE_INDEX, "GstMemIndex", &mem_index_info, 0);
138 return mem_index_type;
142 gst_mem_index_class_init (GstMemIndexClass *klass)
144 GObjectClass *gobject_class;
145 GstIndexClass *gstindex_class;
147 gobject_class = (GObjectClass*)klass;
148 gstindex_class = (GstIndexClass*)klass;
150 parent_class = g_type_class_ref(GST_TYPE_INDEX);
152 gobject_class->dispose = gst_mem_index_dispose;
154 gstindex_class->add_entry = gst_mem_index_add_entry;
155 gstindex_class->get_assoc_entry = gst_mem_index_get_assoc_entry;
159 gst_mem_index_init (GstMemIndex *index)
161 GST_DEBUG(0, "created new mem index");
163 index->associations = NULL;
164 index->id_index = g_hash_table_new (g_int_hash, g_int_equal);
168 gst_mem_index_dispose (GObject *object)
170 //GstMemIndex *memindex = GST_MEM_INDEX (object);
172 G_OBJECT_CLASS (parent_class)->dispose (object);
176 gst_mem_index_add_id (GstIndex *index, GstIndexEntry *entry)
178 GstMemIndex *memindex = GST_MEM_INDEX (index);
179 GstMemIndexId *id_index;
181 id_index = g_hash_table_lookup (memindex->id_index, &entry->id);
184 id_index = g_new0 (GstMemIndexId, 1);
186 id_index->id = entry->id;
187 id_index->format_index = g_hash_table_new (g_int_hash, g_int_equal);
188 g_hash_table_insert (memindex->id_index, &entry->id, id_index);
193 mem_index_compare (gconstpointer a,
197 GstMemIndexFormatIndex *index = user_data;
201 val1 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *)a), index->offset);
202 val2 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *)b), index->offset);
204 diff = (val2 - val1);
206 return (diff == 0 ? 0 : (diff > 0 ? 1 : -1));
210 gst_mem_index_index_format (GstMemIndexId *id_index, GstIndexEntry *entry, gint assoc)
212 GstMemIndexFormatIndex *index;
215 format = &GST_INDEX_ASSOC_FORMAT (entry, assoc);
217 index = g_hash_table_lookup (id_index->format_index, format);
220 index = g_new0 (GstMemIndexFormatIndex, 1);
222 index->format = *format;
223 index->offset = assoc;
224 index->tree = g_tree_new_with_data (mem_index_compare, index);
226 g_hash_table_insert (id_index->format_index, format, index);
229 g_tree_insert (index->tree, entry, entry);
233 gst_mem_index_add_association (GstIndex *index, GstIndexEntry *entry)
235 GstMemIndex *memindex = GST_MEM_INDEX (index);
236 GstMemIndexId *id_index;
238 memindex->associations = g_list_prepend (memindex->associations, entry);
240 id_index = g_hash_table_lookup (memindex->id_index, &entry->id);
244 for (i = 0; i < GST_INDEX_NASSOCS (entry); i++) {
245 gst_mem_index_index_format (id_index, entry, i);
251 gst_mem_index_add_object (GstIndex *index, GstIndexEntry *entry)
256 gst_mem_index_add_format (GstIndex *index, GstIndexEntry *entry)
261 gst_mem_index_add_entry (GstIndex *index, GstIndexEntry *entry)
263 GstMemIndex *memindex = GST_MEM_INDEX (index);
265 GST_DEBUG (0, "adding entry %p\n", memindex);
267 switch (entry->type){
268 case GST_INDEX_ENTRY_ID:
269 gst_mem_index_add_id (index, entry);
271 case GST_INDEX_ENTRY_ASSOCIATION:
272 gst_mem_index_add_association (index, entry);
274 case GST_INDEX_ENTRY_OBJECT:
275 gst_mem_index_add_object (index, entry);
277 case GST_INDEX_ENTRY_FORMAT:
278 gst_mem_index_add_format (index, entry);
287 GstMemIndexFormatIndex *index;
289 GstIndexEntry *lower;
291 GstIndexEntry *higher;
293 } GstMemIndexSearchData;
296 mem_index_search (gconstpointer a,
299 GstMemIndexSearchData *data = (GstMemIndexSearchData *) b;
300 GstMemIndexFormatIndex *index = data->index;
304 val1 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *)a), index->offset);
307 diff = (val1 - val2);
311 /* exact matching, don't update low/high */
313 return (diff > 0 ? 1 : -1);
316 if (diff > data->low_diff) {
317 data->low_diff = diff;
318 data->lower = (GstIndexEntry *) a;
323 if (diff < data->high_diff) {
324 data->high_diff = diff;
325 data->higher = (GstIndexEntry *) a;
333 static GstIndexEntry*
334 gst_mem_index_get_assoc_entry (GstIndex *index, gint id,
335 GstIndexLookupMethod method,
337 GstFormat format, gint64 value,
338 GCompareDataFunc func,
341 GstMemIndex *memindex = GST_MEM_INDEX (index);
342 GstMemIndexId *id_index;
343 GstMemIndexFormatIndex *format_index;
344 GstIndexEntry *entry;
345 GstMemIndexSearchData data;
347 id_index = g_hash_table_lookup (memindex->id_index, &id);
351 format_index = g_hash_table_lookup (id_index->format_index, &format);
356 data.index = format_index;
357 data.exact = (method == GST_INDEX_LOOKUP_EXACT);
359 /* setup data for low/high checks if we are not looking
360 * for an exact match */
362 data.low_diff = G_MININT64;
364 data.high_diff = G_MAXINT64;
368 entry = g_tree_search (format_index->tree, mem_index_search, &data);
370 /* get the low/high values if we're not exact */
371 if (entry == NULL && !data.exact) {
372 if (method == GST_INDEX_LOOKUP_BEFORE)
374 else if (method == GST_INDEX_LOOKUP_AFTER) {
380 if ((GST_INDEX_ASSOC_FLAGS (entry) & flags) != flags) {
381 GList *l_entry = g_list_find (memindex->associations, entry);
386 entry = (GstIndexEntry *) l_entry->data;
388 if (entry->id == id &&
389 (GST_INDEX_ASSOC_FLAGS (entry) & flags) == flags)
392 if (method == GST_INDEX_LOOKUP_BEFORE)
393 l_entry = g_list_next (l_entry);
394 else if (method == GST_INDEX_LOOKUP_AFTER) {
395 l_entry = g_list_previous (l_entry);
405 gst_mem_index_plugin_init (GModule *module, GstPlugin *plugin)
407 GstIndexFactory *factory;
409 gst_plugin_set_longname (plugin, "A memory index");
411 factory = gst_index_factory_new ("memindex",
412 "A index that stores entries in memory",
413 gst_mem_index_get_type());
415 if (factory != NULL) {
416 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
419 g_warning ("could not register memindex");