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gstreamer/gst/gst_private.h
Alex Ashley abdafb0d64 protection: add GstProtectionMeta to support protected content 
In order to support some types of protected streams (such as those
protected using DASH Common Encryption) some per-buffer information
needs to be passed between elements.

This commit adds a GstMeta type called GstProtectionMeta that allows
protection specific information to be added to a GstBuffer. An example
of its usage is qtdemux providing information to each output sample
that enables a downstream element to decrypt it.

This commit adds a utility function to select a supported protection
system from the installed Decryption elements found in the registry.
The gst_protection_select_system function that takes an array of
identifiers and searches the registry for a element of klass Decryptor that
supports one or more of the supplied identifiers. If multiple elements
are found, the one with the highest rank is selected.

This commit adds a unit test for the gst_protection_select_system
function that adds a fake Decryptor element to the registry and then
checks that it can correctly be selected by the utility function.

This commit adds a unit test for GstProtectionMeta that creates
GstProtectionMeta and adds & removes it from a buffer and performs some
simple reference count checks.

API: gst_buffer_add_protection_meta()
API: gst_buffer_get_protection_meta()
API: gst_protection_select_system()
API: gst_protection_meta_api_get_type()
API: gst_protection_meta_get_info()

https://bugzilla.gnome.org/show_bug.cgi?id=705991
2015-04-18 12:24:06 +01:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gst_private.h: Private header for within libgst
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_PRIVATE_H__
#define __GST_PRIVATE_H__
#ifdef HAVE_CONFIG_H
# ifndef GST_LICENSE /* don't include config.h twice, it has no guards */
# include "config.h"
# endif
#endif
/* This needs to be before glib.h, since it might be used in inline
* functions */
extern const char g_log_domain_gstreamer[];
#include <glib.h>
#include <stdlib.h>
#include <string.h>
/* Needed for GstRegistry * */
#include "gstregistry.h"
#include "gststructure.h"
/* we need this in pretty much all files */
#include "gstinfo.h"
/* for the flags in the GstPluginDep structure below */
#include "gstplugin.h"
/* for the pad cache */
#include "gstpad.h"
/* for GstElement */
#include "gstelement.h"
/* for GstDeviceProvider */
#include "gstdeviceprovider.h"
/* for GstToc */
#include "gsttoc.h"
#include "gstdatetime.h"
G_BEGIN_DECLS
/* used by gstparse.c and grammar.y */
struct _GstParseContext {
GList * missing_elements;
};
/* used by gstplugin.c and gstregistrybinary.c */
typedef struct {
/* details registered via gst_plugin_add_dependency() */
GstPluginDependencyFlags flags;
gchar **env_vars;
gchar **paths;
gchar **names;
/* information saved from the last time the plugin was loaded (-1 = unset) */
guint env_hash; /* hash of content of environment variables in env_vars */
guint stat_hash; /* hash of stat() on all relevant files and directories */
} GstPluginDep;
struct _GstPluginPrivate {
GList *deps; /* list of GstPluginDep structures */
GstStructure *cache_data;
};
/* FIXME: could rename all priv_gst_* functions to __gst_* now */
G_GNUC_INTERNAL gboolean priv_gst_plugin_loading_have_whitelist (void);
G_GNUC_INTERNAL guint32 priv_gst_plugin_loading_get_whitelist_hash (void);
G_GNUC_INTERNAL gboolean priv_gst_plugin_desc_is_whitelisted (GstPluginDesc * desc,
const gchar * filename);
G_GNUC_INTERNAL gboolean _priv_plugin_deps_env_vars_changed (GstPlugin * plugin);
G_GNUC_INTERNAL gboolean _priv_plugin_deps_files_changed (GstPlugin * plugin);
G_GNUC_INTERNAL gboolean _priv_gst_in_valgrind (void);
/* init functions called from gst_init(). */
G_GNUC_INTERNAL void _priv_gst_quarks_initialize (void);
G_GNUC_INTERNAL void _priv_gst_mini_object_initialize (void);
G_GNUC_INTERNAL void _priv_gst_memory_initialize (void);
G_GNUC_INTERNAL void _priv_gst_allocator_initialize (void);
G_GNUC_INTERNAL void _priv_gst_buffer_initialize (void);
G_GNUC_INTERNAL void _priv_gst_buffer_list_initialize (void);
G_GNUC_INTERNAL void _priv_gst_structure_initialize (void);
G_GNUC_INTERNAL void _priv_gst_caps_initialize (void);
G_GNUC_INTERNAL void _priv_gst_caps_features_initialize (void);
G_GNUC_INTERNAL void _priv_gst_event_initialize (void);
G_GNUC_INTERNAL void _priv_gst_format_initialize (void);
G_GNUC_INTERNAL void _priv_gst_message_initialize (void);
G_GNUC_INTERNAL void _priv_gst_meta_initialize (void);
G_GNUC_INTERNAL void _priv_gst_plugin_initialize (void);
G_GNUC_INTERNAL void _priv_gst_query_initialize (void);
G_GNUC_INTERNAL void _priv_gst_sample_initialize (void);
G_GNUC_INTERNAL void _priv_gst_tag_initialize (void);
G_GNUC_INTERNAL void _priv_gst_value_initialize (void);
G_GNUC_INTERNAL void _priv_gst_debug_init (void);
G_GNUC_INTERNAL void _priv_gst_context_initialize (void);
G_GNUC_INTERNAL void _priv_gst_toc_initialize (void);
G_GNUC_INTERNAL void _priv_gst_date_time_initialize (void);
/* Private registry functions */
G_GNUC_INTERNAL
gboolean _priv_gst_registry_remove_cache_plugins (GstRegistry *registry);
G_GNUC_INTERNAL void _priv_gst_registry_cleanup (void);
gboolean _gst_plugin_loader_client_run (void);
/* Used in GstBin for manual state handling */
G_GNUC_INTERNAL void _priv_gst_element_state_changed (GstElement *element,
GstState oldstate, GstState newstate, GstState pending);
/* used in both gststructure.c and gstcaps.c; numbers are completely made up */
#define STRUCTURE_ESTIMATED_STRING_LEN(s) (16 + gst_structure_n_fields(s) * 22)
#define FEATURES_ESTIMATED_STRING_LEN(s) (16 + gst_caps_features_get_size(s) * 14)
G_GNUC_INTERNAL
gboolean priv_gst_structure_append_to_gstring (const GstStructure * structure,
GString * s);
G_GNUC_INTERNAL
void priv_gst_caps_features_append_to_gstring (const GstCapsFeatures * features, GString *s);
G_GNUC_INTERNAL
gboolean priv_gst_structure_parse_name (gchar * str, gchar **start, gchar ** end, gchar ** next);
G_GNUC_INTERNAL
gboolean priv_gst_structure_parse_fields (gchar *str, gchar ** end, GstStructure *structure);
/* registry cache backends */
G_GNUC_INTERNAL
gboolean priv_gst_registry_binary_read_cache (GstRegistry * registry, const char *location);
G_GNUC_INTERNAL
gboolean priv_gst_registry_binary_write_cache (GstRegistry * registry, GList * plugins, const char *location);
G_GNUC_INTERNAL
void __gst_element_factory_add_static_pad_template (GstElementFactory * elementfactory,
GstStaticPadTemplate * templ);
G_GNUC_INTERNAL
void __gst_element_factory_add_interface (GstElementFactory * elementfactory,
const gchar * interfacename);
/* used in gstvalue.c and gststructure.c */
#define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \
((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \
((c) == '.'))
/* This is only meant for internal uses */
G_GNUC_INTERNAL
gint __gst_date_time_compare (const GstDateTime * dt1, const GstDateTime * dt2);
G_GNUC_INTERNAL
gchar * __gst_date_time_serialize (GstDateTime * datetime, gboolean with_usecs);
/* Non-static, for access from the testsuite, but not for external use */
gboolean
_priv_gst_do_linear_regression (GstClockTime *times, guint n,
GstClockTime * m_num, GstClockTime * m_denom, GstClockTime * b,
GstClockTime * xbase, gdouble * r_squared);
/* For use in gstdebugutils */
G_GNUC_INTERNAL
GstCapsFeatures * __gst_caps_get_features_unchecked (const GstCaps * caps, guint idx);
#ifndef GST_DISABLE_REGISTRY
/* Secret variable to initialise gst without registry cache */
GST_EXPORT gboolean _gst_disable_registry_cache;
#endif
/* provide inline gst_g_value_get_foo_unchecked(), used in gststructure.c */
#define DEFINE_INLINE_G_VALUE_GET_UNCHECKED(ret_type,name_type,v_field) \
static inline ret_type \
gst_g_value_get_##name_type##_unchecked (const GValue *value) \
{ \
return value->data[0].v_field; \
}
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(gboolean,boolean,v_int)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(gint,int,v_int)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(guint,uint,v_uint)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(gint64,int64,v_int64)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(guint64,uint64,v_uint64)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(gfloat,float,v_float)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(gdouble,double,v_double)
DEFINE_INLINE_G_VALUE_GET_UNCHECKED(const gchar *,string,v_pointer)
/*** debugging categories *****************************************************/
#ifndef GST_REMOVE_GST_DEBUG
GST_EXPORT GstDebugCategory *GST_CAT_GST_INIT;
GST_EXPORT GstDebugCategory *GST_CAT_MEMORY;
GST_EXPORT GstDebugCategory *GST_CAT_PARENTAGE;
GST_EXPORT GstDebugCategory *GST_CAT_STATES;
GST_EXPORT GstDebugCategory *GST_CAT_SCHEDULING;
GST_EXPORT GstDebugCategory *GST_CAT_BUFFER;
GST_EXPORT GstDebugCategory *GST_CAT_BUFFER_LIST;
GST_EXPORT GstDebugCategory *GST_CAT_BUS;
GST_EXPORT GstDebugCategory *GST_CAT_CAPS;
GST_EXPORT GstDebugCategory *GST_CAT_CLOCK;
GST_EXPORT GstDebugCategory *GST_CAT_ELEMENT_PADS;
GST_EXPORT GstDebugCategory *GST_CAT_PADS;
GST_EXPORT GstDebugCategory *GST_CAT_PERFORMANCE;
GST_EXPORT GstDebugCategory *GST_CAT_PIPELINE;
GST_EXPORT GstDebugCategory *GST_CAT_PLUGIN_LOADING;
GST_EXPORT GstDebugCategory *GST_CAT_PLUGIN_INFO;
GST_EXPORT GstDebugCategory *GST_CAT_PROPERTIES;
GST_EXPORT GstDebugCategory *GST_CAT_NEGOTIATION;
GST_EXPORT GstDebugCategory *GST_CAT_REFCOUNTING;
GST_EXPORT GstDebugCategory *GST_CAT_ERROR_SYSTEM;
GST_EXPORT GstDebugCategory *GST_CAT_EVENT;
GST_EXPORT GstDebugCategory *GST_CAT_MESSAGE;
GST_EXPORT GstDebugCategory *GST_CAT_PARAMS;
GST_EXPORT GstDebugCategory *GST_CAT_CALL_TRACE;
GST_EXPORT GstDebugCategory *GST_CAT_SIGNAL;
GST_EXPORT GstDebugCategory *GST_CAT_PROBE;
GST_EXPORT GstDebugCategory *GST_CAT_REGISTRY;
GST_EXPORT GstDebugCategory *GST_CAT_QOS;
GST_EXPORT GstDebugCategory *GST_CAT_META;
GST_EXPORT GstDebugCategory *GST_CAT_LOCKING;
GST_EXPORT GstDebugCategory *GST_CAT_CONTEXT;
/* Categories that should be completely private to
* libgstreamer should be done like this: */
#define GST_CAT_POLL _priv_GST_CAT_POLL
extern GstDebugCategory *_priv_GST_CAT_POLL;
#define GST_CAT_PROTECTION _priv_GST_CAT_PROTECTION
extern GstDebugCategory *_priv_GST_CAT_PROTECTION;
extern GstClockTime _priv_gst_info_start_time;
#else
#define GST_CAT_GST_INIT NULL
#define GST_CAT_AUTOPLUG NULL
#define GST_CAT_AUTOPLUG_ATTEMPT NULL
#define GST_CAT_PARENTAGE NULL
#define GST_CAT_STATES NULL
#define GST_CAT_SCHEDULING NULL
#define GST_CAT_DATAFLOW NULL
#define GST_CAT_BUFFER NULL
#define GST_CAT_BUFFER_LIST NULL
#define GST_CAT_BUS NULL
#define GST_CAT_CAPS NULL
#define GST_CAT_CLOCK NULL
#define GST_CAT_ELEMENT_PADS NULL
#define GST_CAT_PADS NULL
#define GST_CAT_PERFORMANCE NULL
#define GST_CAT_PIPELINE NULL
#define GST_CAT_PLUGIN_LOADING NULL
#define GST_CAT_PLUGIN_INFO NULL
#define GST_CAT_PROPERTIES NULL
#define GST_CAT_NEGOTIATION NULL
#define GST_CAT_REFCOUNTING NULL
#define GST_CAT_ERROR_SYSTEM NULL
#define GST_CAT_EVENT NULL
#define GST_CAT_MESSAGE NULL
#define GST_CAT_PARAMS NULL
#define GST_CAT_CALL_TRACE NULL
#define GST_CAT_SIGNAL NULL
#define GST_CAT_PROBE NULL
#define GST_CAT_REGISTRY NULL
#define GST_CAT_QOS NULL
#define GST_CAT_TYPES NULL
#define GST_CAT_POLL NULL
#define GST_CAT_META NULL
#define GST_CAT_LOCKING NULL
#define GST_CAT_CONTEXT NULL
#define GST_CAT_PROTECTION NULL
#endif
#ifdef GST_DISABLE_GST_DEBUG
/* for _gst_element_error_printf */
#define __gst_vasprintf __gst_info_fallback_vasprintf
int __gst_vasprintf (char **result, char const *format, va_list args);
#endif
/**** objects made opaque until the private bits have been made private ****/
#include <gmodule.h>
#include <time.h> /* time_t */
#include <sys/types.h> /* off_t */
#include <sys/stat.h> /* off_t */
typedef struct _GstPluginPrivate GstPluginPrivate;
struct _GstPlugin {
GstObject object;
/*< private >*/
GstPluginDesc desc;
GstPluginDesc *orig_desc;
gchar * filename;
gchar * basename; /* base name (non-dir part) of plugin path */
GModule * module; /* contains the module if plugin is loaded */
off_t file_size;
time_t file_mtime;
gboolean registered; /* TRUE when the registry has seen a filename
* that matches the plugin's basename */
GstPluginPrivate *priv;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPluginClass {
GstObjectClass object_class;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPluginFeature {
GstObject object;
/*< private >*/
gboolean loaded;
guint rank;
const gchar *plugin_name;
GstPlugin *plugin; /* weak ref */
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPluginFeatureClass {
GstObjectClass parent_class;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
#include "gsttypefind.h"
struct _GstTypeFindFactory {
GstPluginFeature feature;
/* <private> */
GstTypeFindFunction function;
gchar ** extensions;
GstCaps * caps;
gpointer user_data;
GDestroyNotify user_data_notify;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstTypeFindFactoryClass {
GstPluginFeatureClass parent;
/* <private> */
gpointer _gst_reserved[GST_PADDING];
};
struct _GstElementFactory {
GstPluginFeature parent;
GType type; /* unique GType of element or 0 if not loaded */
gpointer metadata;
GList * staticpadtemplates; /* GstStaticPadTemplate list */
guint numpadtemplates;
/* URI interface stuff */
GstURIType uri_type;
gchar ** uri_protocols;
GList * interfaces; /* interface type names this element implements */
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstElementFactoryClass {
GstPluginFeatureClass parent_class;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstDeviceProviderFactory {
GstPluginFeature feature;
/* <private> */
GType type; /* unique GType the device factory or 0 if not loaded */
volatile GstDeviceProvider *provider;
gpointer metadata;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstDeviceProviderFactoryClass {
GstPluginFeatureClass parent;
/* <private> */
gpointer _gst_reserved[GST_PADDING];
};
/* privat flag used by GstBus / GstMessage */
#define GST_MESSAGE_FLAG_ASYNC_DELIVERY (GST_MINI_OBJECT_FLAG_LAST << 0)
G_END_DECLS
#endif /* __GST_PRIVATE_H__ */
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