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gstreamer/gst/gst_private.h
Tim-Philipp Müller f62ee97592 buffer: store sequence number for metas 
For metas where order might be significant if multiple metas are
attached to the same buffer, so store a sequence number with the
meta when adding it to the buffer. This allows users of the meta
to make sure metas are processed in the right order.

We need a 64-bit integer for the sequence number here in the API,
a 32-bit one might overflow too easily with high packet/buffer
rates. We could do it rtp-seqnum style of course, but that's a
bit of a pain.

We could also make it so that gst_buffer_add_meta() just keeps metas in
order or rely on the order we add the metas in, but that seems too
fragile overall, when buffers (incl. metas) get merged or split.

Also add a compare function for easier sorting.

We store the seqnum in the MetaItem struct here and not in the
GstMeta struct since there's no padding in the GstMeta struct.
We could add a private struct to GstMeta before the start of
GstMeta, but that's what MetaItem effectively is implementation-
wise. We can still change this later if we want, since it's all
private.

Fixes #262
2019-02-12 17:53:08 +00:00

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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 GST_API */
#include "gst/gstconfig.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"
#include "gsttracerutils.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;
};
/* Needed by GstMeta (to access meta seq) and GstBuffer (create/free/iterate) */
typedef struct _GstMetaItem GstMetaItem;
struct _GstMetaItem {
GstMetaItem *next;
guint64 seq_num;
GstMeta meta;
};
/* 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 (const 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);
/* cleanup functions called from gst_deinit(). */
G_GNUC_INTERNAL void _priv_gst_allocator_cleanup (void);
G_GNUC_INTERNAL void _priv_gst_caps_features_cleanup (void);
G_GNUC_INTERNAL void _priv_gst_caps_cleanup (void);
/* called from gst_task_cleanup_all(). */
G_GNUC_INTERNAL void _priv_gst_element_cleanup (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);
GST_API
gboolean _gst_plugin_loader_client_run (void);
G_GNUC_INTERNAL GstPlugin * _priv_gst_plugin_load_file_for_registry (const gchar *filename,
GstRegistry * registry,
GError** error);
/* GValue serialization/deserialization */
G_GNUC_INTERNAL const char * _priv_gst_value_gtype_to_abbr (GType type);
G_GNUC_INTERNAL gboolean _priv_gst_value_parse_string (gchar * s, gchar ** end, gchar ** next, gboolean unescape);
G_GNUC_INTERNAL gboolean _priv_gst_value_parse_simple_string (gchar * str, gchar ** end);
G_GNUC_INTERNAL gboolean _priv_gst_value_parse_value (gchar * str, gchar ** after, GValue * value, GType default_type);
G_GNUC_INTERNAL gchar * _priv_gst_value_serialize_any_list (const GValue * value, const gchar * begin, const gchar * end, gboolean print_type);
/* 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
gboolean priv__gst_structure_append_template_to_gstring (GQuark field_id,
const GValue *value,
gpointer user_data);
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);
/* used in gstvalue.c and gststructure.c */
#define GST_WRAPPED_PTR_FORMAT "p\aa"
G_GNUC_INTERNAL
gchar *priv_gst_string_take_and_wrap (gchar * s);
/* 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);
/* 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_API gboolean _gst_disable_registry_cache;
#endif
/* Secret variable to let the plugin scanner use the same base path
* as the main application in order to determine dependencies */
GST_API gchar *_gst_executable_path;
/* 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_API GstDebugCategory *GST_CAT_GST_INIT;
GST_API GstDebugCategory *GST_CAT_MEMORY;
GST_API GstDebugCategory *GST_CAT_PARENTAGE;
GST_API GstDebugCategory *GST_CAT_STATES;
GST_API GstDebugCategory *GST_CAT_SCHEDULING;
GST_API GstDebugCategory *GST_CAT_BUFFER;
GST_API GstDebugCategory *GST_CAT_BUFFER_LIST;
GST_API GstDebugCategory *GST_CAT_BUS;
GST_API GstDebugCategory *GST_CAT_CAPS;
GST_API GstDebugCategory *GST_CAT_CLOCK;
GST_API GstDebugCategory *GST_CAT_ELEMENT_PADS;
GST_API GstDebugCategory *GST_CAT_PADS;
GST_API GstDebugCategory *GST_CAT_PERFORMANCE;
GST_API GstDebugCategory *GST_CAT_PIPELINE;
GST_API GstDebugCategory *GST_CAT_PLUGIN_LOADING;
GST_API GstDebugCategory *GST_CAT_PLUGIN_INFO;
GST_API GstDebugCategory *GST_CAT_PROPERTIES;
GST_API GstDebugCategory *GST_CAT_NEGOTIATION;
GST_API GstDebugCategory *GST_CAT_REFCOUNTING;
GST_API GstDebugCategory *GST_CAT_ERROR_SYSTEM;
GST_API GstDebugCategory *GST_CAT_EVENT;
GST_API GstDebugCategory *GST_CAT_MESSAGE;
GST_API GstDebugCategory *GST_CAT_PARAMS;
GST_API GstDebugCategory *GST_CAT_CALL_TRACE;
GST_API GstDebugCategory *GST_CAT_SIGNAL;
GST_API GstDebugCategory *GST_CAT_PROBE;
GST_API GstDebugCategory *GST_CAT_REGISTRY;
GST_API GstDebugCategory *GST_CAT_QOS;
GST_API GstDebugCategory *GST_CAT_META;
GST_API GstDebugCategory *GST_CAT_LOCKING;
GST_API 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_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;
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 _GstTracerFactory {
GstPluginFeature feature;
/* <private> */
GType type;
/*
gpointer user_data;
GDestroyNotify user_data_notify;
*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstTracerFactoryClass {
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];
};
struct _GstDynamicTypeFactory {
GstPluginFeature feature;
GType type; /* GType of the type, when loaded. 0 if not */
};
struct _GstDynamicTypeFactoryClass {
GstPluginFeatureClass parent;
};
/* 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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