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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
22 #define GST_TYPE_MEM_INDEX \
23 (gst_index_get_type ())
24 #define GST_MEM_INDEX(obj) \
25 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MEM_INDEX, GstMemIndex))
26 #define GST_MEM_INDEX_CLASS(klass) \
27 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MEM_INDEX, GstMemIndexClass))
28 #define GST_IS_MEM_INDEX(obj) \
29 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MEM_INDEX))
30 #define GST_IS_MEM_INDEX_CLASS(klass) \
31 (GST_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MEM_INDEX))
36 * All entries are simply added to a GList first. Then we build
37 * an index to each entry for each id/format
41 * -----------------------------...
51 * The memindex creates a MemIndexId object for each writer id, a
52 * Hashtable is kept to map the id to the MemIndexId
54 * The MemIndexId keeps a MemIndexFormatIndex for each format the
55 * specific writer wants indexed.
57 * The MemIndexFormatIndex keeps all the values of the particular
58 * format in a GTree, The values of the GTree point back to the entry.
60 * Finding a value for an id/format requires locating the correct GTree,
61 * then do a lookup in the Tree to get the required value.
70 GstMemIndexFormatIndex;
75 GHashTable *format_index;
79 typedef struct _GstMemIndex GstMemIndex;
80 typedef struct _GstMemIndexClass GstMemIndexClass;
91 struct _GstMemIndexClass
93 GstIndexClass parent_class;
96 static void gst_mem_index_finalize (GObject * object);
98 static void gst_mem_index_add_entry (GstIndex * index, GstIndexEntry * entry);
99 static GstIndexEntry *gst_mem_index_get_assoc_entry (GstIndex * index, gint id,
100 GstIndexLookupMethod method, GstIndexAssociationFlags flags,
101 GstFormat format, gint64 value, GCompareDataFunc func, gpointer user_data);
103 #define CLASS(mem_index) GST_MEM_INDEX_CLASS (G_OBJECT_GET_CLASS (mem_index))
105 static GType gst_mem_index_get_type (void);
107 typedef GstMemIndex GstFlvDemuxMemIndex;
108 typedef GstMemIndexClass GstFlvDemuxMemIndexClass;
109 G_DEFINE_TYPE (GstFlvDemuxMemIndex, gst_mem_index, GST_TYPE_INDEX);
112 gst_mem_index_class_init (GstMemIndexClass * klass)
114 GObjectClass *gobject_class;
115 GstIndexClass *gstindex_class;
117 gobject_class = (GObjectClass *) klass;
118 gstindex_class = (GstIndexClass *) klass;
120 gobject_class->finalize = gst_mem_index_finalize;
122 gstindex_class->add_entry = GST_DEBUG_FUNCPTR (gst_mem_index_add_entry);
123 gstindex_class->get_assoc_entry =
124 GST_DEBUG_FUNCPTR (gst_mem_index_get_assoc_entry);
128 gst_mem_index_init (GstMemIndex * index)
130 GST_DEBUG ("created new mem index");
132 index->associations = NULL;
133 index->id_index = g_hash_table_new (g_int_hash, g_int_equal);
137 gst_mem_index_free_format (gpointer key, gpointer value, gpointer user_data)
139 GstMemIndexFormatIndex *index = (GstMemIndexFormatIndex *) value;
142 g_tree_destroy (index->tree);
145 g_slice_free (GstMemIndexFormatIndex, index);
149 gst_mem_index_free_id (gpointer key, gpointer value, gpointer user_data)
151 GstMemIndexId *id_index = (GstMemIndexId *) value;
153 if (id_index->format_index) {
154 g_hash_table_foreach (id_index->format_index, gst_mem_index_free_format,
156 g_hash_table_destroy (id_index->format_index);
157 id_index->format_index = NULL;
160 g_slice_free (GstMemIndexId, id_index);
164 gst_mem_index_finalize (GObject * object)
166 GstMemIndex *memindex = GST_MEM_INDEX (object);
168 /* Delete the trees referencing the associations first */
169 if (memindex->id_index) {
170 g_hash_table_foreach (memindex->id_index, gst_mem_index_free_id, NULL);
171 g_hash_table_destroy (memindex->id_index);
172 memindex->id_index = NULL;
175 /* Then delete the associations themselves */
176 if (memindex->associations) {
177 g_list_foreach (memindex->associations, (GFunc) gst_index_entry_free, NULL);
178 g_list_free (memindex->associations);
179 memindex->associations = NULL;
182 G_OBJECT_CLASS (gst_mem_index_parent_class)->finalize (object);
186 gst_mem_index_add_id (GstIndex * index, GstIndexEntry * entry)
188 GstMemIndex *memindex = GST_MEM_INDEX (index);
189 GstMemIndexId *id_index;
191 id_index = g_hash_table_lookup (memindex->id_index, &entry->id);
194 id_index = g_slice_new0 (GstMemIndexId);
196 id_index->id = entry->id;
197 id_index->format_index = g_hash_table_new (g_int_hash, g_int_equal);
198 g_hash_table_insert (memindex->id_index, &id_index->id, id_index);
203 mem_index_compare (gconstpointer a, gconstpointer b, gpointer user_data)
205 GstMemIndexFormatIndex *index = user_data;
209 val1 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *) a), index->offset);
210 val2 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *) b), index->offset);
212 diff = (val2 - val1);
214 return (diff == 0 ? 0 : (diff > 0 ? 1 : -1));
218 gst_mem_index_index_format (GstMemIndexId * id_index, GstIndexEntry * entry,
221 GstMemIndexFormatIndex *index;
224 format = &GST_INDEX_ASSOC_FORMAT (entry, assoc);
226 index = g_hash_table_lookup (id_index->format_index, format);
229 index = g_slice_new0 (GstMemIndexFormatIndex);
231 index->format = *format;
232 index->offset = assoc;
233 index->tree = g_tree_new_with_data (mem_index_compare, index);
235 g_hash_table_insert (id_index->format_index, &index->format, index);
238 g_tree_insert (index->tree, entry, entry);
242 gst_mem_index_add_association (GstIndex * index, GstIndexEntry * entry)
244 GstMemIndex *memindex = GST_MEM_INDEX (index);
245 GstMemIndexId *id_index;
247 memindex->associations = g_list_prepend (memindex->associations, entry);
249 id_index = g_hash_table_lookup (memindex->id_index, &entry->id);
253 for (i = 0; i < GST_INDEX_NASSOCS (entry); i++) {
254 gst_mem_index_index_format (id_index, entry, i);
260 gst_mem_index_add_object (GstIndex * index, GstIndexEntry * entry)
265 gst_mem_index_add_format (GstIndex * index, GstIndexEntry * entry)
270 gst_mem_index_add_entry (GstIndex * index, GstIndexEntry * entry)
272 GST_LOG_OBJECT (index, "added this entry");
274 switch (entry->type) {
275 case GST_INDEX_ENTRY_ID:
276 gst_mem_index_add_id (index, entry);
278 case GST_INDEX_ENTRY_ASSOCIATION:
279 gst_mem_index_add_association (index, entry);
281 case GST_INDEX_ENTRY_OBJECT:
282 gst_mem_index_add_object (index, entry);
284 case GST_INDEX_ENTRY_FORMAT:
285 gst_mem_index_add_format (index, entry);
295 GstMemIndexFormatIndex *index;
297 GstIndexEntry *lower;
299 GstIndexEntry *higher;
302 GstMemIndexSearchData;
305 mem_index_search (gconstpointer a, gconstpointer b)
307 GstMemIndexSearchData *data = (GstMemIndexSearchData *) b;
308 GstMemIndexFormatIndex *index = data->index;
312 val1 = GST_INDEX_ASSOC_VALUE (((GstIndexEntry *) a), index->offset);
315 diff = (val1 - val2);
319 /* exact matching, don't update low/high */
321 return (diff > 0 ? 1 : -1);
324 if (diff > data->low_diff) {
325 data->low_diff = diff;
326 data->lower = (GstIndexEntry *) a;
330 if (diff < data->high_diff) {
331 data->high_diff = diff;
332 data->higher = (GstIndexEntry *) a;
340 static GstIndexEntry *
341 gst_mem_index_get_assoc_entry (GstIndex * index, gint id,
342 GstIndexLookupMethod method,
343 GstIndexAssociationFlags flags,
344 GstFormat format, gint64 value, GCompareDataFunc func, gpointer user_data)
346 GstMemIndex *memindex = GST_MEM_INDEX (index);
347 GstMemIndexId *id_index;
348 GstMemIndexFormatIndex *format_index;
349 GstIndexEntry *entry;
350 GstMemIndexSearchData data;
352 id_index = g_hash_table_lookup (memindex->id_index, &id);
356 format_index = g_hash_table_lookup (id_index->format_index, &format);
361 data.index = format_index;
362 data.exact = (method == GST_INDEX_LOOKUP_EXACT);
364 /* setup data for low/high checks if we are not looking
365 * for an exact match */
367 data.low_diff = G_MININT64;
369 data.high_diff = G_MAXINT64;
373 entry = g_tree_search (format_index->tree, mem_index_search, &data);
375 /* get the low/high values if we're not exact */
376 if (entry == NULL && !data.exact) {
377 if (method == GST_INDEX_LOOKUP_BEFORE)
379 else if (method == GST_INDEX_LOOKUP_AFTER) {
384 if (entry && ((GST_INDEX_ASSOC_FLAGS (entry) & flags) != flags)) {
385 if (method != GST_INDEX_LOOKUP_EXACT) {
386 GList *l_entry = g_list_find (memindex->associations, entry);
391 entry = (GstIndexEntry *) l_entry->data;
393 if (entry->id == id && (GST_INDEX_ASSOC_FLAGS (entry) & flags) == flags)
396 if (method == GST_INDEX_LOOKUP_BEFORE)
397 l_entry = g_list_next (l_entry);
398 else if (method == GST_INDEX_LOOKUP_AFTER) {
399 l_entry = g_list_previous (l_entry);
412 gst_mem_index_plugin_init (GstPlugin * plugin)
414 GstIndexFactory *factory;
416 factory = gst_index_factory_new ("memindex",
417 "A index that stores entries in memory", gst_mem_index_get_type ());
419 if (factory == NULL) {
420 g_warning ("failed to create memindex factory");
424 GST_PLUGIN_FEATURE (factory)->plugin_name = plugin->desc.name;
425 GST_PLUGIN_FEATURE (factory)->loaded = TRUE;
427 gst_registry_add_feature (gst_registry_get_default (),
428 GST_PLUGIN_FEATURE (factory));