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libs/gst/base/gsttypefindhelper.c: Cleanup the typefindhelper code and add private doc comments.
Original commit message from CVS: * libs/gst/base/gsttypefindhelper.c: (helper_find_peek), (helper_find_suggest), (helper_find_get_length), (gst_type_find_helper_get_range), (buf_helper_find_suggest), (gst_type_find_helper_for_buffer): Cleanup the typefindhelper code and add private doc comments.
This commit is contained in:
Stefan Kost
parent
44dbaa02d5
commit
308e3f4410
2 changed files with 117 additions and 79 deletions
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@ -1,3 +1,11 @@
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2007-07-24 Stefan Kost <ensonic@users.sf.net>
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* libs/gst/base/gsttypefindhelper.c: (helper_find_peek),
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(helper_find_suggest), (helper_find_get_length),
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(gst_type_find_helper_get_range), (buf_helper_find_suggest),
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(gst_type_find_helper_for_buffer):
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Cleanup the typefindhelper code and add private doc comments.
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2007-07-24 Edward Hervey <bilboed@bilboed.com>
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* plugins/elements/gstcapsfilter.c: (gst_capsfilter_class_init),
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@ -56,44 +56,53 @@ type_find_factory_rank_cmp (gconstpointer fac1, gconstpointer fac2)
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typedef struct
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{
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GSList *buffers; /* buffer cache */
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guint64 size;
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GstTypeFindHelperGetRangeFunction func;
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guint best_probability;
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GstCaps *caps;
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guint64 size;
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GSList *buffers;
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GstTypeFindFactory *factory;
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GstTypeFindHelperGetRangeFunction func;
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GstObject *obj;
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}
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GstTypeFindHelper;
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GstTypeFindFactory *factory; /* for logging */
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GstObject *obj; /* for logging */
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} GstTypeFindHelper;
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/*
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* helper_find_peek:
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* @data: helper data struct
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* @off: stream offset
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* @size: block size
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*
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* Get data pointer within a stream. Keeps a cache of read buffers.
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*
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* Returns: address of the data or %NULL if buffer does not cover the
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* requested range.
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*/
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static guint8 *
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helper_find_peek (gpointer data, gint64 offset, guint size)
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{
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GstTypeFindHelper *find;
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GstTypeFindHelper *helper;
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GstBuffer *buffer;
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GstFlowReturn ret;
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find = (GstTypeFindHelper *) data;
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helper = (GstTypeFindHelper *) data;
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GST_LOG_OBJECT (find->obj, "'%s' called peek (%" G_GINT64_FORMAT
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", %u)", GST_PLUGIN_FEATURE_NAME (find->factory), offset, size);
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GST_LOG_OBJECT (helper->obj, "'%s' called peek (%" G_GINT64_FORMAT
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", %u)", GST_PLUGIN_FEATURE_NAME (helper->factory), offset, size);
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if (size == 0)
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return NULL;
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if (offset < 0) {
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if (find->size == -1 || find->size < -offset)
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if (helper->size == -1 || helper->size < -offset)
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return NULL;
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offset += find->size;
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offset += helper->size;
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}
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/* see if we have a matching buffer already in our list */
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if (size > 0) {
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GSList *walk;
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for (walk = find->buffers; walk; walk = walk->next) {
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for (walk = helper->buffers; walk; walk = walk->next) {
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GstBuffer *buf = GST_BUFFER_CAST (walk->data);
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guint64 buf_offset = GST_BUFFER_OFFSET (buf);
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guint buf_size = GST_BUFFER_SIZE (buf);
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@ -104,7 +113,7 @@ helper_find_peek (gpointer data, gint64 offset, guint size)
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}
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buffer = NULL;
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ret = find->func (find->obj, offset, size, &buffer);
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ret = helper->func (helper->obj, offset, size, &buffer);
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if (ret != GST_FLOW_OK)
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goto error;
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@ -120,42 +129,52 @@ helper_find_peek (gpointer data, gint64 offset, guint size)
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return NULL;
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}
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find->buffers = g_slist_prepend (find->buffers, buffer);
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helper->buffers = g_slist_prepend (helper->buffers, buffer);
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return GST_BUFFER_DATA (buffer);
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error:
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{
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GST_INFO ("typefind function returned: %s", gst_flow_get_name (ret));
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return NULL;
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}
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}
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/*
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* helper_find_suggest:
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* @data: helper data struct
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* @probability: probability of the match
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* @caps: caps of the type
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*
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* If given @probability is higher, replace previously store caps.
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*/
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static void
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helper_find_suggest (gpointer data, guint probability, const GstCaps * caps)
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{
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GstTypeFindHelper *find = (GstTypeFindHelper *) data;
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GstTypeFindHelper *helper = (GstTypeFindHelper *) data;
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GST_LOG_OBJECT (find->obj,
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GST_LOG_OBJECT (helper->obj,
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"'%s' called called suggest (%u, %" GST_PTR_FORMAT ")",
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GST_PLUGIN_FEATURE_NAME (find->factory), probability, caps);
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GST_PLUGIN_FEATURE_NAME (helper->factory), probability, caps);
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if (probability > find->best_probability) {
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if (probability > helper->best_probability) {
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GstCaps *copy = gst_caps_copy (caps);
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gst_caps_replace (&find->caps, copy);
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gst_caps_replace (&helper->caps, copy);
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gst_caps_unref (copy);
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find->best_probability = probability;
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helper->best_probability = probability;
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}
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}
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static guint64
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helper_find_get_length (gpointer data)
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{
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GstTypeFindHelper *find = (GstTypeFindHelper *) data;
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GstTypeFindHelper *helper = (GstTypeFindHelper *) data;
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GST_LOG_OBJECT (find->obj, "'%s' called called get_length, returning %"
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G_GUINT64_FORMAT, GST_PLUGIN_FEATURE_NAME (find->factory), find->size);
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GST_LOG_OBJECT (helper->obj, "'%s' called called get_length, returning %"
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G_GUINT64_FORMAT, GST_PLUGIN_FEATURE_NAME (helper->factory),
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helper->size);
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return find->size;
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return helper->size;
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}
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/**
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@ -184,61 +203,56 @@ gst_type_find_helper_get_range (GstObject * obj,
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GstTypeFindHelperGetRangeFunction func, guint64 size,
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GstTypeFindProbability * prob)
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{
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GstTypeFind gst_find;
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GstTypeFindHelper find;
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GSList *l;
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GList *walk, *type_list = NULL;
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GstTypeFindHelper helper;
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GstTypeFind find;
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GSList *walk;
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GList *l, *type_list;
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GstCaps *result = NULL;
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g_return_val_if_fail (GST_IS_OBJECT (obj), NULL);
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g_return_val_if_fail (func != NULL, NULL);
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type_list = gst_type_find_factory_get_list ();
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helper.buffers = NULL;
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helper.size = size;
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helper.func = func;
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helper.best_probability = 0;
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helper.caps = NULL;
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helper.obj = obj;
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type_list = g_list_sort (type_list, type_find_factory_rank_cmp);
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find.best_probability = 0;
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find.caps = NULL;
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find.size = size;
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find.buffers = NULL;
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find.func = func;
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find.obj = obj;
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gst_find.data = &find;
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gst_find.peek = helper_find_peek;
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gst_find.suggest = helper_find_suggest;
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find.data = &helper;
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find.peek = helper_find_peek;
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find.suggest = helper_find_suggest;
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if (size == 0 || size == (guint64) - 1) {
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gst_find.get_length = NULL;
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find.get_length = NULL;
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} else {
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gst_find.get_length = helper_find_get_length;
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find.get_length = helper_find_get_length;
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}
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walk = type_list;
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/* FIXME: we need to keep this list within the registry */
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type_list = gst_type_find_factory_get_list ();
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type_list = g_list_sort (type_list, type_find_factory_rank_cmp);
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while (walk) {
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
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find.factory = factory;
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gst_type_find_factory_call_function (factory, &gst_find);
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if (find.best_probability >= GST_TYPE_FIND_MAXIMUM)
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for (l = type_list; l; l = l->next) {
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helper.factory = GST_TYPE_FIND_FACTORY (l->data);
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gst_type_find_factory_call_function (helper.factory, &find);
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if (helper.best_probability >= GST_TYPE_FIND_MAXIMUM)
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break;
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walk = g_list_next (walk);
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}
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gst_plugin_feature_list_free (type_list);
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if (find.best_probability > 0)
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result = find.caps;
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for (walk = helper.buffers; walk; walk = walk->next)
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gst_buffer_unref (GST_BUFFER_CAST (walk->data));
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g_slist_free (helper.buffers);
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for (l = find.buffers; l; l = l->next)
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gst_buffer_unref (GST_BUFFER_CAST (l->data));
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g_slist_free (find.buffers);
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if (helper.best_probability > 0)
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result = helper.caps;
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if (prob)
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*prob = find.best_probability;
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*prob = helper.best_probability;
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GST_LOG_OBJECT (obj, "Returning %" GST_PTR_FORMAT " (probability = %u)",
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result, (guint) find.best_probability);
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result, (guint) helper.best_probability);
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return result;
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}
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@ -271,14 +285,25 @@ gst_type_find_helper (GstPad * src, guint64 size)
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typedef struct
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{
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guint8 *data;
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guint8 *data; /* buffer data */
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guint size;
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guint best_probability;
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GstCaps *caps;
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GstObject *factory; /* for logging */
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GstTypeFindFactory *factory; /* for logging */
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GstObject *obj; /* for logging */
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} GstTypeFindBufHelper;
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/*
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* buf_helper_find_peek:
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* @data: helper data struct
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* @off: stream offset
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* @size: block size
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*
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* Get data pointer within a buffer.
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*
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* Returns: address inside the buffer or %NULL if buffer does not cover the
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* requested range.
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*/
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static guint8 *
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buf_helper_find_peek (gpointer data, gint64 off, guint size)
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{
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@ -303,22 +328,30 @@ buf_helper_find_peek (gpointer data, gint64 off, guint size)
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return NULL;
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}
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/*
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* buf_helper_find_suggest:
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* @data: helper data struct
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* @probability: probability of the match
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* @caps: caps of the type
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*
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* If given @probability is higher, replace previously store caps.
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*/
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static void
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buf_helper_find_suggest (gpointer data, guint prob, const GstCaps * caps)
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buf_helper_find_suggest (gpointer data, guint probability, const GstCaps * caps)
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{
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GstTypeFindBufHelper *helper = (GstTypeFindBufHelper *) data;
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GST_LOG_OBJECT (helper->obj,
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"'%s' called called suggest (%u, %" GST_PTR_FORMAT ")",
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GST_PLUGIN_FEATURE_NAME (helper->factory), prob, caps);
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GST_PLUGIN_FEATURE_NAME (helper->factory), probability, caps);
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/* Note: not >= as we call typefinders in order of rank, highest first */
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if (prob > helper->best_probability) {
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if (probability > helper->best_probability) {
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GstCaps *copy = gst_caps_copy (caps);
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gst_caps_replace (&helper->caps, copy);
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gst_caps_unref (copy);
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helper->best_probability = prob;
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helper->best_probability = probability;
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}
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}
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@ -349,6 +382,7 @@ gst_type_find_helper_for_buffer (GstObject * obj, GstBuffer * buf,
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GstTypeFindBufHelper helper;
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GstTypeFind find;
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GList *l, *type_list;
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GstCaps *result = NULL;
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g_return_val_if_fail (buf != NULL, NULL);
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g_return_val_if_fail (GST_IS_BUFFER (buf), NULL);
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@ -369,30 +403,26 @@ gst_type_find_helper_for_buffer (GstObject * obj, GstBuffer * buf,
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find.suggest = buf_helper_find_suggest;
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find.get_length = NULL;
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/* FIXME: we need to keep this list within the registry */
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type_list = gst_type_find_factory_get_list ();
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type_list = g_list_sort (type_list, type_find_factory_rank_cmp);
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for (l = type_list; l != NULL; l = l->next) {
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (l->data);
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helper.factory = GST_OBJECT (factory);
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gst_type_find_factory_call_function (factory, &find);
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for (l = type_list; l; l = l->next) {
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helper.factory = GST_TYPE_FIND_FACTORY (l->data);
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gst_type_find_factory_call_function (helper.factory, &find);
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if (helper.best_probability >= GST_TYPE_FIND_MAXIMUM)
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break;
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}
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gst_plugin_feature_list_free (type_list);
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if (helper.best_probability == 0)
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return NULL;
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if (helper.best_probability > 0)
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result = helper.caps;
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if (prob)
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*prob = helper.best_probability;
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GST_LOG_OBJECT (obj, "Returning %" GST_PTR_FORMAT " (probability = %u)",
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helper.caps, (guint) helper.best_probability);
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result, (guint) helper.best_probability);
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return helper.caps;
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return result;
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}
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