/* GStreamer
- * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
- * 2000 Wim Taymans <wtay@chello.be>
+ * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
- * gsttypefind.c:
+ * gsttypefind.c: typefinding subsystem
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
+/**
+ * SECTION:gsttypefind
+ * @title: GstTypefind
+ * @short_description: Stream type detection
+ *
+ * The following functions allow you to detect the media type of an unknown
+ * stream.
+ */
#include "gst_private.h"
-
-#include "gsttype.h"
-
-#include "gstlog.h"
+#include "gstinfo.h"
#include "gsttypefind.h"
+#include "gstregistry.h"
+#include "gsttypefindfactory.h"
+
+GST_DEBUG_CATEGORY_EXTERN (type_find_debug);
+#define GST_CAT_DEFAULT type_find_debug
+
+G_DEFINE_POINTER_TYPE (GstTypeFind, gst_type_find);
+
+/**
+ * gst_type_find_register:
+ * @plugin: (allow-none): A #GstPlugin, or %NULL for a static typefind function
+ * @name: The name for registering
+ * @rank: The rank (or importance) of this typefind function
+ * @func: The #GstTypeFindFunction to use
+ * @extensions: (allow-none): Optional comma-separated list of extensions
+ * that could belong to this type
+ * @possible_caps: Optionally the caps that could be returned when typefinding
+ * succeeds
+ * @data: Optional user data. This user data must be available until the plugin
+ * is unloaded.
+ * @data_notify: a #GDestroyNotify that will be called on @data when the plugin
+ * is unloaded.
+ *
+ * Registers a new typefind function to be used for typefinding. After
+ * registering this function will be available for typefinding.
+ * This function is typically called during an element's plugin initialization.
+ *
+ * Returns: %TRUE on success, %FALSE otherwise
+ */
+gboolean
+gst_type_find_register (GstPlugin * plugin, const gchar * name, guint rank,
+ GstTypeFindFunction func, const gchar * extensions,
+ GstCaps * possible_caps, gpointer data, GDestroyNotify data_notify)
+{
+ GstTypeFindFactory *factory;
-/* #define GST_DEBUG_ENABLED */
-
-GstElementDetails gst_type_find_details = {
- "TypeFind",
- "Generic",
- "Finds the media type of a stream",
- VERSION,
- "Erik Walthinsen <omega@cse.ogi.edu>"
- "Wim Taymans <wim.taymans@chello.be>",
- "(C) 1999",
-};
-
-
-/* TypeFind signals and args */
-enum {
- HAVE_TYPE,
- LAST_SIGNAL
-};
-
-enum {
- ARG_0,
- ARG_CAPS,
-};
-
+ g_return_val_if_fail (name != NULL, FALSE);
-static void gst_type_find_class_init (GstTypeFindClass *klass);
-static void gst_type_find_init (GstTypeFind *typefind);
+ GST_INFO ("registering typefind function for %s", name);
-static void gst_type_find_set_property (GObject *object, guint prop_id,
- const GValue *value, GParamSpec *pspec);
-static void gst_type_find_get_property (GObject *object, guint prop_id,
- GValue *value, GParamSpec *pspec);
+ factory = g_object_new (GST_TYPE_TYPE_FIND_FACTORY, NULL);
+ GST_DEBUG_OBJECT (factory, "using new typefind factory for %s", name);
-static void gst_type_find_chain (GstPad *pad, GstBuffer *buf);
+ gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
+ gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
-static GstElementClass *parent_class = NULL;
-static guint gst_type_find_signals[LAST_SIGNAL] = { 0 };
+ if (extensions)
+ factory->extensions = g_strsplit (extensions, ",", -1);
-GType
-gst_type_find_get_type (void)
-{
- static GType typefind_type = 0;
-
- if (!typefind_type) {
- static const GTypeInfo typefind_info = {
- sizeof(GstTypeFindClass),
- NULL,
- NULL,
- (GClassInitFunc)gst_type_find_class_init,
- NULL,
- NULL,
- sizeof(GstTypeFind),
- 0,
- (GInstanceInitFunc)gst_type_find_init,
- NULL
- };
- typefind_type = g_type_register_static (GST_TYPE_ELEMENT, "GstTypeFind", &typefind_info, 0);
+ gst_caps_replace (&factory->caps, possible_caps);
+ factory->function = func;
+ factory->user_data = data;
+ factory->user_data_notify = data_notify;
+ if (plugin && plugin->desc.name) {
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name; /* interned string */
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
+ g_object_add_weak_pointer ((GObject *) plugin,
+ (gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
+ } else {
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
}
- return typefind_type;
-}
+ GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
-static void
-gst_type_find_class_init (GstTypeFindClass *klass)
-{
- GObjectClass *gobject_class;
-
- gobject_class = (GObjectClass*)klass;
+ gst_registry_add_feature (gst_registry_get (),
+ GST_PLUGIN_FEATURE_CAST (factory));
- parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+ return TRUE;
+}
- g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CAPS,
- g_param_spec_pointer("caps", "Caps", "Found capabilities", G_PARAM_READABLE));
+/*** typefind function interface **********************************************/
- gst_type_find_signals[HAVE_TYPE] =
- g_signal_new ("have_type", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
- G_STRUCT_OFFSET (GstTypeFindClass, have_type), NULL, NULL,
- g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
- G_TYPE_POINTER);
+/**
+ * gst_type_find_peek:
+ * @find: The #GstTypeFind object the function was called with
+ * @offset: The offset
+ * @size: The number of bytes to return
+ *
+ * Returns the @size bytes of the stream to identify beginning at offset. If
+ * offset is a positive number, the offset is relative to the beginning of the
+ * stream, if offset is a negative number the offset is relative to the end of
+ * the stream. The returned memory is valid until the typefinding function
+ * returns and must not be freed.
+ *
+ * Returns: (transfer none) (array length=size) (nullable): the
+ * requested data, or %NULL if that data is not available.
+ */
+const guint8 *
+gst_type_find_peek (GstTypeFind * find, gint64 offset, guint size)
+{
+ g_return_val_if_fail (find->peek != NULL, NULL);
- gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_type_find_set_property);
- gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_type_find_get_property);
+ return find->peek (find->data, offset, size);
}
-static void
-gst_type_find_init (GstTypeFind *typefind)
+/**
+ * gst_type_find_suggest:
+ * @find: The #GstTypeFind object the function was called with
+ * @probability: The probability in percent that the suggestion is right
+ * @caps: The fixed #GstCaps to suggest
+ *
+ * If a #GstTypeFindFunction calls this function it suggests the caps with the
+ * given probability. A #GstTypeFindFunction may supply different suggestions
+ * in one call.
+ * It is up to the caller of the #GstTypeFindFunction to interpret these values.
+ */
+void
+gst_type_find_suggest (GstTypeFind * find, guint probability, GstCaps * caps)
{
- typefind->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
- gst_element_add_pad (GST_ELEMENT (typefind), typefind->sinkpad);
- gst_pad_set_chain_function (typefind->sinkpad, gst_type_find_chain);
+ g_return_if_fail (find->suggest != NULL);
+ g_return_if_fail (probability <= 100);
+ g_return_if_fail (caps != NULL);
+ g_return_if_fail (gst_caps_is_fixed (caps));
+
+ find->suggest (find->data, probability, caps);
}
-static void
-gst_type_find_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+/**
+ * gst_type_find_suggest_simple:
+ * @find: The #GstTypeFind object the function was called with
+ * @probability: The probability in percent that the suggestion is right
+ * @media_type: the media type of the suggested caps
+ * @fieldname: (allow-none): first field of the suggested caps, or %NULL
+ * @...: additional arguments to the suggested caps in the same format as the
+ * arguments passed to gst_structure_new() (ie. triplets of field name,
+ * field GType and field value)
+ *
+ * If a #GstTypeFindFunction calls this function it suggests the caps with the
+ * given probability. A #GstTypeFindFunction may supply different suggestions
+ * in one call. It is up to the caller of the #GstTypeFindFunction to interpret
+ * these values.
+ *
+ * This function is similar to gst_type_find_suggest(), only that instead of
+ * passing a #GstCaps argument you can create the caps on the fly in the same
+ * way as you can with gst_caps_new_simple().
+ *
+ * Make sure you terminate the list of arguments with a %NULL argument and that
+ * the values passed have the correct type (in terms of width in bytes when
+ * passed to the vararg function - this applies particularly to gdouble and
+ * guint64 arguments).
+ */
+void
+gst_type_find_suggest_simple (GstTypeFind * find, guint probability,
+ const char *media_type, const char *fieldname, ...)
{
- GstTypeFind *typefind;
-
- /* it's not null if we got it, but it might not be ours */
- g_return_if_fail (GST_IS_TYPE_FIND (object));
+ GstStructure *structure;
+ va_list var_args;
+ GstCaps *caps;
- typefind = GST_TYPE_FIND (object);
+ g_return_if_fail (find->suggest != NULL);
+ g_return_if_fail (probability <= 100);
+ g_return_if_fail (media_type != NULL);
- switch (prop_id) {
- default:
- break;
- }
-}
+ caps = gst_caps_new_empty ();
-static void
-gst_type_find_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
-{
- GstTypeFind *typefind;
+ va_start (var_args, fieldname);
+ structure = gst_structure_new_valist (media_type, fieldname, var_args);
+ va_end (var_args);
- /* it's not null if we got it, but it might not be ours */
- g_return_if_fail (GST_IS_TYPE_FIND (object));
+ gst_caps_append_structure (caps, structure);
+ g_return_if_fail (gst_caps_is_fixed (caps));
- typefind = GST_TYPE_FIND (object);
-
- switch (prop_id) {
- case ARG_CAPS:
- g_value_set_pointer(value, typefind->caps);
- break;
- default:
- break;
- }
+ find->suggest (find->data, probability, caps);
+ gst_caps_unref (caps);
}
-static void
-gst_type_find_chain (GstPad *pad, GstBuffer *buf)
+/**
+ * gst_type_find_get_length:
+ * @find: The #GstTypeFind the function was called with
+ *
+ * Get the length of the data stream.
+ *
+ * Returns: The length of the data stream, or 0 if it is not available.
+ */
+guint64
+gst_type_find_get_length (GstTypeFind * find)
{
- GstTypeFind *typefind;
- GList *type_list;
- GstType *type;
-
- g_return_if_fail (pad != NULL);
- g_return_if_fail (GST_IS_PAD (pad));
- g_return_if_fail (buf != NULL);
-
- typefind = GST_TYPE_FIND (GST_OBJECT_PARENT (pad));
- GST_DEBUG (0,"got buffer of %d bytes in '%s'",
- GST_BUFFER_SIZE (buf), GST_OBJECT_NAME (typefind));
-
- type_list = (GList *) gst_type_get_list ();
-
- while (type_list) {
- GSList *factories;
- type = (GstType *)type_list->data;
-
- factories = type->factories;
-
- while (factories) {
- GstTypeFactory *factory = GST_TYPE_FACTORY (factories->data);
- GstTypeFindFunc typefindfunc = (GstTypeFindFunc)factory->typefindfunc;
- GstCaps *caps;
-
- GST_DEBUG (0,"try type (%p) :%d \"%s\" %p", factory, type->id, type->mime, typefindfunc);
- if (typefindfunc && (caps = typefindfunc (buf, factory))) {
- GST_DEBUG (0,"found type :%d \"%s\" \"%s\"", caps->id, type->mime,
- gst_caps_get_name (caps));
- typefind->caps = caps;
-
- if (!gst_pad_try_set_caps (pad, caps)) {
- g_warning ("typefind: found type but peer didn't accept it");
- }
-
- {
- /* int oldstate = GST_STATE(typefind);*/
- gst_object_ref (GST_OBJECT (typefind));
- g_signal_emit (G_OBJECT (typefind), gst_type_find_signals[HAVE_TYPE], 0,
- typefind->caps);
-/* if (GST_STATE(typefind) != oldstate) {
- GST_DEBUG(0, "state changed during signal, aborting");
- gst_element_interrupt (GST_ELEMENT (typefind));
- } */
- gst_object_unref (GST_OBJECT (typefind));
-
- goto end;
- }
- }
- factories = g_slist_next (factories);
- }
-
- type_list = g_list_next (type_list);
- }
-end:
- gst_buffer_unref (buf);
+ if (find->get_length == NULL)
+ return 0;
+
+ return find->get_length (find->data);
}
projects / platform / upstream / gstreamer.git / blobdiff