gstreamer/gst/gstutils.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstutils.h: Header for various utility functions
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#ifndef __GST_UTILS_H__
#define __GST_UTILS_H__

#include <glib.h>
#include <gst/gstbin.h>

G_BEGIN_DECLS

void		gst_util_set_value_from_string	(GValue *value, const gchar *value_str);
void		gst_util_set_object_arg		(GObject *object, const gchar *name, const gchar *value);
void		gst_util_dump_mem		(const guchar *mem, guint size);

guint64		gst_util_uint64_scale		(guint64 val, guint64 num, guint64 denom);

void		gst_print_pad_caps		(GString *buf, gint indent, GstPad *pad);
void		gst_print_element_args		(GString *buf, gint indent, GstElement *element);


/* Macros for defining classes.  Ideas taken from Bonobo, which took theirs
   from Nautilus and GOB. */

/* Define the boilerplate type stuff to reduce typos and code size.  Defines
   the get_type method and the parent_class static variable.
   void additional_initializations (GType type) is for initializing interfaces
   and stuff like that */

#define GST_BOILERPLATE_FULL(type, type_as_function, parent_type, parent_type_macro, additional_initializations)	\
									\
static void type_as_function ## _base_init     (gpointer      g_class);	\
static void type_as_function ## _class_init    (type ## Class *g_class);\
static void type_as_function ## _init	       (type          *object,	\
                                                type ## Class *g_class);\
static parent_type ## Class *parent_class = NULL;			\
static void								\
type_as_function ## _class_init_trampoline (gpointer g_class,		\
					    gpointer data)		\
{									\
  parent_class = (parent_type ## Class *)				\
      g_type_class_peek_parent (g_class);				\
  type_as_function ## _class_init ((type ## Class *)g_class);		\
}									\
									\
GType									\
type_as_function ## _get_type (void)					\
{									\
  static GType object_type = 0;						\
  if (object_type == 0) {						\
    static const GTypeInfo object_info = {				\
      sizeof (type ## Class),						\
      type_as_function ## _base_init,					\
      NULL,		  /* base_finalize */				\
      type_as_function ## _class_init_trampoline,			\
      NULL,		  /* class_finalize */				\
      NULL,               /* class_data */				\
      sizeof (type),							\
      0,                  /* n_preallocs */				\
      (GInstanceInitFunc) type_as_function ## _init			\
    };									\
    object_type = g_type_register_static (parent_type_macro, #type,	\
	&object_info, (GTypeFlags) 0);					\
    additional_initializations (object_type);				\
  }									\
  return object_type;							\
}

#define __GST_DO_NOTHING(type)	/* NOP */
#define GST_BOILERPLATE(type,type_as_function,parent_type,parent_type_macro)	\
  GST_BOILERPLATE_FULL (type, type_as_function, parent_type, parent_type_macro,	\
      __GST_DO_NOTHING)

/* Like GST_BOILERPLATE, but makes the type 1) implement an interface, and 2)
 * implement GstImplementsInterface for that type
 *
 * After this you will need to implement interface_as_function ## _supported
 * and interface_as_function ## _interface_init
 */
#define GST_BOILERPLATE_WITH_INTERFACE(type, type_as_function,		\
    parent_type, parent_type_as_macro, interface_type,			\
    interface_type_as_macro, interface_as_function)			\
                                                                        \
static void interface_as_function ## _interface_init (interface_type ## Class *klass);  \
static gboolean interface_as_function ## _supported (type *object, GType iface_type);   \
                                                                        \
static void                                                             \
type_as_function ## _implements_interface_init (GstImplementsInterfaceClass *klass)     \
{                                                                       \
  klass->supported = (gpointer)interface_as_function ## _supported;     \
}                                                                       \
                                                                        \
static void                                                             \
type_as_function ## _init_interfaces (GType type)                       \
{                                                                       \
  static const GInterfaceInfo implements_iface_info = {                 \
    (GInterfaceInitFunc) type_as_function ## _implements_interface_init,\
    NULL,                                                               \
    NULL,                                                               \
  };                                                                    \
  static const GInterfaceInfo iface_info = {                            \
    (GInterfaceInitFunc) interface_as_function ## _interface_init,      \
    NULL,                                                               \
    NULL,                                                               \
  };                                                                    \
                                                                        \
  g_type_add_interface_static (type, GST_TYPE_IMPLEMENTS_INTERFACE,     \
      &implements_iface_info);                                          \
  g_type_add_interface_static (type, interface_type_as_macro,		\
      &iface_info);							\
}                                                                       \
                                                                        \
GST_BOILERPLATE_FULL (type, type_as_function, parent_type,              \
    parent_type_as_macro, type_as_function ## _init_interfaces)

/* Just call the parent handler.  This assumes that there is a variable
 * named parent_class that points to the (duh!) parent class.  Note that
 * this macro is not to be used with things that return something, use
 * the _WITH_DEFAULT version for that */
#define GST_CALL_PARENT(parent_class_cast, name, args)			\
	((parent_class_cast(parent_class)->name != NULL) ?		\
	 parent_class_cast(parent_class)->name args : (void) 0)

/* Same as above, but in case there is no implementation, it evaluates
 * to def_return */
#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args,	\
    def_return)								\
	((parent_class_cast(parent_class)->name != NULL) ?		\
	 parent_class_cast(parent_class)->name args : def_return)

/* Define possibly unaligned memory access method whether the type of
 * architecture. */
#if GST_HAVE_UNALIGNED_ACCESS

#define _GST_GET(__data, __size, __end) \
    (GUINT##__size##_FROM_##__end (* ((guint##__size *) (__data))))

#define GST_READ_UINT64_BE(data)	_GST_GET (data, 64, BE)
#define GST_READ_UINT64_LE(data)	_GST_GET (data, 64, LE)
#define GST_READ_UINT32_BE(data)	_GST_GET (data, 32, BE)
#define GST_READ_UINT32_LE(data)        _GST_GET (data, 32, LE)
#define GST_READ_UINT16_BE(data)        _GST_GET (data, 16, BE)
#define GST_READ_UINT16_LE(data)        _GST_GET (data, 16, LE)
#define GST_READ_UINT8(data)		(* ((guint8 *) (data)))

#define _GST_PUT(__data, __size, __end, __num) \
    ((* (guint##__size *) (__data)) = GUINT##__size##_TO_##__end (__num))

#define GST_WRITE_UINT64_BE(data, num)	_GST_PUT(data, 64, BE, num)
#define GST_WRITE_UINT64_LE(data, num)  _GST_PUT(data, 64, LE, num)
#define GST_WRITE_UINT32_BE(data, num)  _GST_PUT(data, 32, BE, num)
#define GST_WRITE_UINT32_LE(data, num)  _GST_PUT(data, 32, LE, num)
#define GST_WRITE_UINT16_BE(data, num)  _GST_PUT(data, 16, BE, num)
#define GST_WRITE_UINT16_LE(data, num)  _GST_PUT(data, 16, LE, num)
#define GST_WRITE_UINT8(data, num)	((* (guint8 *) (data)) = (num))

#else /* GST_HAVE_UNALIGNED_ACCESS */

#define _GST_GET(__data, __idx, __size, __shift) \
    (((guint##__size) (((guint8 *) (__data))[__idx])) << __shift)

#define GST_READ_UINT64_BE(data)	(_GST_GET (data, 0, 64, 56) | \
					 _GST_GET (data, 1, 64, 48) | \
					 _GST_GET (data, 2, 64, 40) | \
					 _GST_GET (data, 3, 64, 32) | \
					 _GST_GET (data, 4, 64, 24) | \
					 _GST_GET (data, 5, 64, 16) | \
					 _GST_GET (data, 6, 64,  8) | \
					 _GST_GET (data, 7, 64,  0))

#define GST_READ_UINT64_LE(data)	(_GST_GET (data, 7, 64, 56) | \
					 _GST_GET (data, 6, 64, 48) | \
					 _GST_GET (data, 5, 64, 40) | \
					 _GST_GET (data, 4, 64, 32) | \
					 _GST_GET (data, 3, 64, 24) | \
					 _GST_GET (data, 2, 64, 16) | \
					 _GST_GET (data, 1, 64,  8) | \
					 _GST_GET (data, 0, 64,  0))

#define GST_READ_UINT32_BE(data)	(_GST_GET (data, 0, 32, 24) | \
					 _GST_GET (data, 1, 32, 16) | \
					 _GST_GET (data, 2, 32,  8) | \
					 _GST_GET (data, 3, 32,  0))

#define GST_READ_UINT32_LE(data)	(_GST_GET (data, 3, 32, 24) | \
					 _GST_GET (data, 2, 32, 16) | \
					 _GST_GET (data, 1, 32,  8) | \
					 _GST_GET (data, 0, 32,  0))

#define GST_READ_UINT16_BE(data)	(_GST_GET (data, 0, 16,  8) | \
					 _GST_GET (data, 1, 16,  0))

#define GST_READ_UINT16_LE(data)	(_GST_GET (data, 1, 16,  8) | \
					 _GST_GET (data, 0, 16,  0))

#define GST_READ_UINT8(data)		(_GST_GET (data, 0,  8,  0))

#define _GST_PUT(__data, __idx, __size, __shift, __num) \
    (((guint8 *) (__data))[__idx] = (((guint##__size) __num) >> __shift) & 0xff)

#define GST_WRITE_UINT64_BE(data, num)	do { \
					  _GST_PUT (data, 0, 64, 56, num); \
					  _GST_PUT (data, 1, 64, 48, num); \
					  _GST_PUT (data, 2, 64, 40, num); \
					  _GST_PUT (data, 3, 64, 32, num); \
					  _GST_PUT (data, 4, 64, 24, num); \
					  _GST_PUT (data, 5, 64, 16, num); \
					  _GST_PUT (data, 6, 64,  8, num); \
					  _GST_PUT (data, 7, 64,  0, num); \
					} while (0)

#define GST_WRITE_UINT64_LE(data, num)	do { \
					  _GST_PUT (data, 0, 64,  0, num); \
					  _GST_PUT (data, 1, 64,  8, num); \
					  _GST_PUT (data, 2, 64, 16, num); \
					  _GST_PUT (data, 3, 64, 24, num); \
					  _GST_PUT (data, 4, 64, 32, num); \
					  _GST_PUT (data, 5, 64, 40, num); \
					  _GST_PUT (data, 6, 64, 48, num); \
					  _GST_PUT (data, 7, 64, 56, num); \
					} while (0)

#define GST_WRITE_UINT32_BE(data, num)	do { \
					  _GST_PUT (data, 0, 32, 24, num); \
					  _GST_PUT (data, 1, 32, 16, num); \
					  _GST_PUT (data, 2, 32,  8, num); \
					  _GST_PUT (data, 3, 32,  0, num); \
					} while (0)

#define GST_WRITE_UINT32_LE(data, num)	do { \
					  _GST_PUT (data, 0, 32,  0, num); \
					  _GST_PUT (data, 1, 32,  8, num); \
					  _GST_PUT (data, 2, 32, 16, num); \
					  _GST_PUT (data, 3, 32, 24, num); \
					} while (0)

#define GST_WRITE_UINT16_BE(data, num)	do { \
					  _GST_PUT (data, 0, 16,  8, num); \
					  _GST_PUT (data, 1, 16,  0, num); \
					} while (0)

#define GST_WRITE_UINT16_LE(data, num)	do { \
					  _GST_PUT (data, 0, 16,  0, num); \
					  _GST_PUT (data, 1, 16,  8, num); \
					} while (0)

#define GST_WRITE_UINT8(data, num)	do { \
					  _GST_PUT (data, 0,  8,  0, num); \
					} while (0)

#endif /* GST_HAVE_UNALIGNED_ACCESS */


/* Miscellaneous utility macros */
#define GST_ROUND_UP_2(num)  (((num)+1)&~1)
#define GST_ROUND_UP_4(num)  (((num)+3)&~3)
#define GST_ROUND_UP_8(num)  (((num)+7)&~7)
#define GST_ROUND_UP_16(num) (((num)+15)&~15)
#define GST_ROUND_UP_32(num) (((num)+31)&~31)
#define GST_ROUND_UP_64(num) (((num)+63)&~63)

void			gst_object_default_error	(GstObject * source,
							 GError * error, gchar * debug);


/* element functions */
GstFlowReturn		gst_element_abort_preroll	(GstElement *element);
GstFlowReturn		gst_element_finish_preroll	(GstElement *element, GstPad *pad);

void                    gst_element_create_all_pads     (GstElement *element);
GstPad*                 gst_element_get_compatible_pad  (GstElement *element, GstPad *pad,
		                                         const GstCaps *caps);

GstPadTemplate*         gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);

G_CONST_RETURN gchar*   gst_element_state_get_name      (GstState state);

gboolean		gst_element_link                (GstElement *src, GstElement *dest);
gboolean		gst_element_link_many           (GstElement *element_1,
		                                         GstElement *element_2, ...);
gboolean		gst_element_link_filtered	(GstElement * src,
                                                         GstElement * dest,
                                                         GstCaps *filter);
void                    gst_element_unlink              (GstElement *src, GstElement *dest);
void                    gst_element_unlink_many         (GstElement *element_1,
		                                         GstElement *element_2, ...);

gboolean		gst_element_link_pads           (GstElement *src, const gchar *srcpadname,
		                                         GstElement *dest, const gchar *destpadname);
void                    gst_element_unlink_pads         (GstElement *src, const gchar *srcpadname,
		                                         GstElement *dest, const gchar *destpadname);

gboolean		gst_element_link_pads_filtered	(GstElement * src, const gchar * srcpadname,
                                                         GstElement * dest, const gchar * destpadname,
                                                         GstCaps *filter);
GstStateChangeReturn    gst_element_set_state_async     (GstElement * element, GstState state);

/* util elementfactory functions */
gboolean		gst_element_factory_can_src_caps(GstElementFactory *factory, const GstCaps *caps);
gboolean		gst_element_factory_can_sink_caps(GstElementFactory *factory, const GstCaps *caps);

/* util query functions */
gboolean                gst_element_query_position      (GstElement *element, GstFormat *format,
		                                         gint64 *cur, gint64 *end);
gboolean                gst_element_query_convert       (GstElement *element, GstFormat src_format, gint64 src_val,
		                                         GstFormat *dest_fmt, gint64 *dest_val);

/* element class functions */
void			gst_element_class_install_std_props (GstElementClass * klass,
							 const gchar * first_name, ...);

/* pad functions */
gboolean                gst_pad_can_link                (GstPad *srcpad, GstPad *sinkpad);

void			gst_pad_use_fixed_caps		(GstPad *pad);
GstCaps*		gst_pad_get_fixed_caps_func	(GstPad *pad);
GstCaps*		gst_pad_proxy_getcaps		(GstPad * pad);
gboolean		gst_pad_proxy_setcaps		(GstPad * pad, GstCaps * caps);

GstElement*		gst_pad_get_parent_element	(GstPad *pad);

/* flow */
G_CONST_RETURN gchar*   gst_flow_get_name		(GstFlowReturn ret);


/* util query functions */
gboolean                gst_pad_query_position          (GstPad *pad, GstFormat *format,
		                                         gint64 *cur, gint64 *end);
gboolean                gst_pad_query_convert           (GstPad *pad, GstFormat src_format, gint64 src_val,
		                                         GstFormat *dest_format, gint64 *dest_val);

/* bin functions */
void			gst_bin_add_many                (GstBin *bin, GstElement *element_1, ...);
void			gst_bin_remove_many             (GstBin *bin, GstElement *element_1, ...);
void			gst_bin_watch_for_state_change  (GstBin *bin);

/* buffer functions */
GstBuffer *		gst_buffer_merge		(GstBuffer * buf1, GstBuffer * buf2);
GstBuffer *		gst_buffer_join			(GstBuffer * buf1, GstBuffer * buf2);
void			gst_buffer_stamp		(GstBuffer * dest, const GstBuffer * src);

/* atomic functions */
void                    gst_atomic_int_set              (gint * atomic_int, gint value);

/* probes */
gulong			gst_pad_add_data_probe		(GstPad * pad,
							 GCallback handler,
							 gpointer data);
void			gst_pad_remove_data_probe	(GstPad * pad, guint handler_id);
gulong			gst_pad_add_event_probe		(GstPad * pad,
							 GCallback handler,
							 gpointer data);
void			gst_pad_remove_event_probe	(GstPad * pad, guint handler_id);
gulong			gst_pad_add_buffer_probe	(GstPad * pad,
							 GCallback handler,
							 gpointer data);
void			gst_pad_remove_buffer_probe	(GstPad * pad, guint handler_id);

/* tag emission utility functions */
void			gst_element_found_tags_for_pad	(GstElement * element,
							 GstPad * pad,
							 GstTagList * list);
void			gst_element_found_tags		(GstElement * element,
							 GstTagList * list);

G_END_DECLS

#endif /* __GST_UTILS_H__ */