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f55a8091a6
Original commit message from CVS: remove gst_info remove gstlog.h, fold back to gstinfo.h update translations
323 lines
9.8 KiB
C
323 lines
9.8 KiB
C
/* GStreamer
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gsttypefind.h: typefinding subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gsttypefind.h"
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#include "gstregistrypool.h"
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GST_DEBUG_CATEGORY_STATIC (gst_type_find_debug);
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#define GST_CAT_DEFAULT gst_type_find_debug
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static void gst_type_find_factory_class_init (gpointer g_class,
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gpointer class_data);
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static void gst_type_find_factory_init (GTypeInstance * instance,
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gpointer g_class);
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static void gst_type_find_factory_dispose (GObject * object);
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static void gst_type_find_factory_unload_thyself (GstPluginFeature * feature);
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static void gst_type_find_load_plugin (GstTypeFind * find, gpointer data);
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static GstPluginFeatureClass *parent_class = NULL;
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GType
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gst_type_find_factory_get_type (void)
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{
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static GType typefind_type = 0;
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if (!typefind_type) {
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static const GTypeInfo typefind_info = {
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sizeof (GstTypeFindFactoryClass),
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NULL,
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NULL,
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gst_type_find_factory_class_init,
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NULL,
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NULL,
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sizeof (GstTypeFindFactory),
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0,
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gst_type_find_factory_init,
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NULL
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};
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typefind_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE,
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"GstTypeFindFactory", &typefind_info, 0);
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GST_DEBUG_CATEGORY_INIT (gst_type_find_debug, "GST_TYPEFIND",
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GST_DEBUG_FG_GREEN, "typefinding subsystem");
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}
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return typefind_type;
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}
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static void
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gst_type_find_factory_class_init (gpointer g_class, gpointer class_data)
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{
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GstPluginFeatureClass *gstpluginfeature_class =
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GST_PLUGIN_FEATURE_CLASS (g_class);
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GObjectClass *object_class = G_OBJECT_CLASS (g_class);
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parent_class = g_type_class_peek_parent (g_class);
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object_class->dispose = gst_type_find_factory_dispose;
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gstpluginfeature_class->unload_thyself =
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GST_DEBUG_FUNCPTR (gst_type_find_factory_unload_thyself);
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}
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static void
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gst_type_find_factory_init (GTypeInstance * instance, gpointer g_class)
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{
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (instance);
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factory->user_data = factory;
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factory->function = gst_type_find_load_plugin;
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}
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static void
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gst_type_find_factory_dispose (GObject * object)
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{
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (object);
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if (factory->caps) {
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gst_caps_free (factory->caps);
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factory->caps = NULL;
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}
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if (factory->extensions) {
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g_strfreev (factory->extensions);
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factory->extensions = NULL;
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}
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}
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static void
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gst_type_find_factory_unload_thyself (GstPluginFeature * feature)
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{
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (feature);
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factory->function = gst_type_find_load_plugin;
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factory->user_data = factory;
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}
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static void
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gst_type_find_load_plugin (GstTypeFind * find, gpointer data)
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{
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (data);
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GST_DEBUG_OBJECT (factory, "need to load typefind function %s",
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GST_PLUGIN_FEATURE_NAME (factory));
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if (gst_plugin_feature_ensure_loaded (GST_PLUGIN_FEATURE (factory))) {
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if (factory->function == gst_type_find_load_plugin) {
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/* looks like we didn't get a real typefind function */
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g_warning ("could not load valid typefind function for feature '%s'\n",
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GST_PLUGIN_FEATURE_NAME (factory));
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} else {
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g_assert (factory->function);
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gst_type_find_factory_call_function (factory, find);
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}
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}
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}
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/**
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* gst_type_find_factory_get_list:
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*
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* Gets the list of all registered typefind factories. You must free the
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* list using g_list_free.
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*
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* Returns: the list of all registered typefind factories
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*/
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GList *
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gst_type_find_factory_get_list (void)
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{
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return gst_registry_pool_feature_list (GST_TYPE_TYPE_FIND_FACTORY);
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}
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/**
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* gst_type_find_factory_get_caps:
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* @factory: a factory
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*
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* Gets the caps associated with a typefind factory.
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*
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* Returns: the #GstCaps associated with this factory
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*/
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const GstCaps *
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gst_type_find_factory_get_caps (const GstTypeFindFactory * factory)
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{
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g_return_val_if_fail (GST_IS_TYPE_FIND_FACTORY (factory), NULL);
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return factory->caps;
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}
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/**
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* gst_type_find_factory_get_extensions:
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* @factory: a factory
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*
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* Gets the extensions associated with a typefind factory. The returned
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* array should not be changed. If you need to change stuff in it, you should
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* copy it using g_stdupv(). This function may return NULL to indicate
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* a 0-length list.
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*
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* Returns: a NULL-terminated array of extensions associated with this factory
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*/
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gchar **
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gst_type_find_factory_get_extensions (const GstTypeFindFactory * factory)
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{
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g_return_val_if_fail (GST_IS_TYPE_FIND_FACTORY (factory), NULL);
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return factory->extensions;
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}
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/**
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* gst_type_find_factory_call_function:
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* @factory: a factory
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* @find: a properly setup #GstTypeFind entry. The get_data and suggest_type
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* members must be set.
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*
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* Calls the typefinding function associated with this factory.
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*/
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void
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gst_type_find_factory_call_function (const GstTypeFindFactory * factory,
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GstTypeFind * find)
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{
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g_return_if_fail (GST_IS_TYPE_FIND_FACTORY (factory));
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g_return_if_fail (find != NULL);
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g_return_if_fail (find->peek != NULL);
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g_return_if_fail (find->suggest != NULL);
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/* should never happen */
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g_assert (factory->function != NULL);
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factory->function (find, factory->user_data);
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}
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/**
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* gst_type_find_register:
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* @plugin: the GstPlugin to register with
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* @name: the name for registering
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* @rank: rank (or importance) of this typefind function
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* @func: the function to use for typefinding
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* @extensions: optional extensions that could belong to this type
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* @possible_caps: optionally the caps that could be returned when typefinding succeeds
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* @data: optional user data. This user data must be available until the plugin
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* is unloaded.
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*
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* Registers a new typefind function to be used for typefinding. After
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* registering this function will be available for typefinding.
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* This function is typically called during an element's plugin initialization.
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*
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* Returns: TRUE on success, FALSE otherwise
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*/
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gboolean
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gst_type_find_register (GstPlugin * plugin, const gchar * name, guint rank,
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GstTypeFindFunction func, gchar ** extensions,
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const GstCaps * possible_caps, gpointer data)
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{
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GstTypeFindFactory *factory;
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g_return_val_if_fail (plugin != NULL, FALSE);
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g_return_val_if_fail (name != NULL, FALSE);
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g_return_val_if_fail (func != NULL, FALSE);
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GST_INFO ("registering typefind function for %s", name);
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factory =
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GST_TYPE_FIND_FACTORY (gst_registry_pool_find_feature (name,
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GST_TYPE_TYPE_FIND_FACTORY));
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if (!factory) {
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factory = g_object_new (GST_TYPE_TYPE_FIND_FACTORY, NULL);
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GST_DEBUG_OBJECT (factory, "using new typefind factory for %s", name);
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g_assert (GST_IS_TYPE_FIND_FACTORY (factory));
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gst_plugin_feature_set_name (GST_PLUGIN_FEATURE (factory), name);
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} else {
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GST_DEBUG_OBJECT (factory, "using old typefind factory for %s", name);
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}
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gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), rank);
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if (factory->extensions)
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g_strfreev (factory->extensions);
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factory->extensions = g_strdupv (extensions);
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gst_caps_replace (&factory->caps, gst_caps_copy (possible_caps));
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factory->function = func;
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factory->user_data = data;
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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/*** typefind function interface **********************************************/
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/**
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* gst_type_find_peek:
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* @find: the find object the function was called with
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* @offset: the offset
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* @size: the number of bytes to return
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*
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* Returns size bytes of the stream to identify beginning at offset. If offset
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* is a positive number, the offset is relative to the beginning of the stream,
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* if offset is a negative number the offset is relative to the end of the
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* stream. The returned memory is valid until the typefinding function returns
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* and must not be freed.
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* If NULL is returned, that data is not available.
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*
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* Returns: the requested data or NULL if that data is not available.
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*/
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guint8 *
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gst_type_find_peek (GstTypeFind * find, gint64 offset, guint size)
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{
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g_return_val_if_fail (find->peek != NULL, NULL);
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return find->peek (find->data, offset, size);
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}
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/**
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* gst_type_find_suggest:
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* @find: the find object the function was called with
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* @probability: the probability in percent that the suggestion is right
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* @caps: the fixed caps to suggest
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*
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* If a typefind function calls this function it suggests the caps with the
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* given probability. A typefind function may supply different suggestions
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* in one call.
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* It is up to the caller of the typefind function to interpret these values.
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*/
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void
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gst_type_find_suggest (GstTypeFind * find, guint probability,
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const GstCaps * caps)
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{
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g_return_if_fail (find->suggest != NULL);
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g_return_if_fail (probability <= 100);
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g_return_if_fail (caps != NULL);
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g_return_if_fail (gst_caps_is_fixed (caps));
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find->suggest (find->data, probability, caps);
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}
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/**
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* gst_type_find_get_length:
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* @find: the find object the function was called with
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*
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* Get the length of the data stream.
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*
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* Returns: the length of the data stream or 0 if it is not available.
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*/
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guint64
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gst_type_find_get_length (GstTypeFind * find)
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{
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if (find->get_length == NULL)
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return 0;
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return find->get_length (find->data);
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}
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