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libs/gst/base/gsttypefindhelper.*: New API: gst_type_find_helper_for_buffer() (#332723).
Original commit message from CVS: * libs/gst/base/gsttypefindhelper.c: (buf_helper_find_peek), (buf_helper_find_suggest), (type_find_factory_rank_cmp), (gst_type_find_helper_for_buffer): * libs/gst/base/gsttypefindhelper.h: New API: gst_type_find_helper_for_buffer() (#332723).
This commit is contained in:
Tim-Philipp Müller
parent
323c4ca50e
commit
991aa71ffb
3 changed files with 158 additions and 2 deletions
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@ -1,3 +1,11 @@
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2006-02-27 Tim-Philipp Müller <tim at centricular dot net>
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* libs/gst/base/gsttypefindhelper.c: (buf_helper_find_peek),
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(buf_helper_find_suggest), (type_find_factory_rank_cmp),
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(gst_type_find_helper_for_buffer):
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* libs/gst/base/gsttypefindhelper.h:
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New API: gst_type_find_helper_for_buffer() (#332723).
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2006-02-27 Michael Smith <msmith@fluendo.com>
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* configure.ac:
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@ -1,6 +1,7 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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* Copyright (C) 2000,2005 Wim Taymans <wim@fluendo.com>
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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*
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* gsttypefindhelper.c:
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*
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@ -181,3 +182,145 @@ gst_type_find_helper (GstPad * src, guint64 size)
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return result;
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}
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/* ********************** typefinding for buffers ************************* */
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typedef struct
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{
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guint8 *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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GstObject *obj; /* for logging */
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} GstTypeFindBufHelper;
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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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GstTypeFindBufHelper *helper;
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helper = (GstTypeFindBufHelper *) data;
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GST_LOG_OBJECT (helper->obj, "'%s' called peek (%" G_GINT64_FORMAT ", %u)",
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GST_PLUGIN_FEATURE_NAME (helper->factory), off, size);
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if (size == 0)
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return NULL;
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if (off < 0) {
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GST_LOG_OBJECT (helper->obj, "'%s' wanted to peek at end; not supported",
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GST_PLUGIN_FEATURE_NAME (helper->factory));
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return NULL;
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}
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if ((off + size) < helper->size)
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return helper->data + off;
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return NULL;
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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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{
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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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/* 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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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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}
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}
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static gint
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type_find_factory_rank_cmp (gconstpointer fac1, gconstpointer fac2)
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{
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if (GST_PLUGIN_FEATURE (fac1)->rank != GST_PLUGIN_FEATURE (fac2)->rank)
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return GST_PLUGIN_FEATURE (fac2)->rank - GST_PLUGIN_FEATURE (fac1)->rank;
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/* to make the order in which things happen more deterministic,
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* sort by name when the ranks are the same. */
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return strcmp (GST_PLUGIN_FEATURE_NAME (fac1),
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GST_PLUGIN_FEATURE_NAME (fac2));
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}
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/**
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* gst_type_find_helper_for_buffer:
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* @obj: object doing the typefinding, or NULL (used for logging)
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* @buf: a #GstBuffer with data to typefind
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* @prob: location to store the probability of the found caps, or #NULL
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*
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* Tries to find what type of data is contained in the given #GstBuffer, the
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* assumption being that the buffer represents the beginning of the stream or
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* file.
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*
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* All available typefinders will be called on the data in order of rank. If
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* a typefinding function returns a probability of #GST_TYPE_FIND_MAXIMUM,
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* typefinding is stopped immediately and the found caps will be returned
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* right away. Otherwise, all available typefind functions will the tried,
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* and the caps with the highest probability will be returned, or #NULL if
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* the content of the buffer could not be identified.
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*
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* Returns: The #GstCaps corresponding to the data, or #NULL if no type could
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* be found. The caller should free the caps returned with gst_caps_unref().
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*/
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GstCaps *
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gst_type_find_helper_for_buffer (GstObject * obj, GstBuffer * buf,
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GstTypeFindProbability * prob)
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{
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GstTypeFindBufHelper helper;
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GstTypeFind find;
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GList *l, *type_list;
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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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g_return_val_if_fail (GST_BUFFER_OFFSET (buf) == 0 ||
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GST_BUFFER_OFFSET (buf) == GST_BUFFER_OFFSET_NONE, NULL);
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helper.data = GST_BUFFER_DATA (buf);
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helper.size = GST_BUFFER_SIZE (buf);
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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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if (helper.data == NULL || helper.size == 0)
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return NULL;
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find.data = &helper;
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find.peek = buf_helper_find_peek;
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find.suggest = buf_helper_find_suggest;
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find.get_length = NULL;
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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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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 (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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return helper.caps;
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}
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@ -1,6 +1,7 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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* Copyright (C) 2000,2005 Wim Taymans <wim@fluendo.com>
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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*
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* gsttypefindhelper.h:
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*
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@ -29,6 +30,10 @@ G_BEGIN_DECLS
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GstCaps * gst_type_find_helper (GstPad *src, guint64 size);
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GstCaps * gst_type_find_helper_for_buffer (GstObject *obj,
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GstBuffer *buf,
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GstTypeFindProbability *prob);
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G_END_DECLS
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#endif /* __GST_TYPEFINDHELPER_H__ */
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