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gstreamer/gst/gstutils.h
Christophe Fergeau dde0d169b5 gst/gstutils.h: Do proper cast here to make GST_BOILERPLATE_WITH_INTERFACE 
Original commit message from CVS:
* gst/gstutils.h:
Do proper cast here to make GST_BOILERPLATE_WITH_INTERFACE
usable in c++ code (#333417; patch by: Christophe Fergeau)
2006-03-06 14:46:31 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2002 Thomas Vander Stichele <thomas@apestaart.org>
*
* 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 <gst/gstconfig.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_gdouble_to_guint64 (gdouble value);
gdouble gst_util_guint64_to_gdouble (guint64 value);
/**
* gst_guint64_to_gdouble:
* @value: the #guint64 value to convert
*
* Convert @value to a gdouble.
*
* Returns: @value converted to a #gdouble.
*/
/**
* gst_gdouble_to_guint64:
* @value: the #gdouble value to convert
*
* Convert @value to a guint64.
*
* Returns: @value converted to a #guint64.
*/
#ifdef WIN32
#define gst_gdouble_to_guint64(value) gst_util_gdouble_to_guint64(value)
#define gst_guint64_to_gdouble(value) gst_util_guint64_to_gdouble(value)
#else
#define gst_gdouble_to_guint64(value) ((guint64) (value))
#define gst_guint64_to_gdouble(value) ((gdouble) (value))
#endif
guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom);
guint64 gst_util_uint64_scale_int (guint64 val, gint num, gint 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. */
/**
* GST_BOILERPLATE_FULL:
* @type: the name of the type struct
* @type_as_function: the prefix for the functions
* @parent_type: the parent type struct name
* @parent_type_macro: the parent type macro
* @additional_initializations: function pointer in the form of
* void additional_initializations (GType type) that can be used for
* initializing interfaces and the like
*
* Define the boilerplate type stuff to reduce typos and code size. Defines
* the get_type method and the parent_class static variable.
*
* <informalexample>
* <programlisting>
* GST_BOILERPLATE_FULL (GstFdSink, gst_fdsink, GstElement, GST_TYPE_ELEMENT, _do_init);
* </programlisting>
* </informalexample>
*/
#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); \
\
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 */
/**
* GST_BOILERPLATE:
* @type: the name of the type struct
* @type_as_function: the prefix for the functions
* @parent_type: the parent type struct name
* @parent_type_macro: the parent type macro
*
* Define the boilerplate type stuff to reduce typos and code size. Defines
* the get_type method and the parent_class static variable.
*
* <informalexample>
* <programlisting>
* GST_BOILERPLATE (GstFdSink, gst_fdsink, GstElement, GST_TYPE_ELEMENT);
* </programlisting>
* </informalexample>
*/
#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
*/
/**
* GST_BOILERPLATE_WITH_INTERFACE:
* @type: the name of the type struct
* @type_as_function: the prefix for the functions
* @parent_type: the parent type struct name
* @parent_type_as_macro: the parent type macro
* @interface_type: the name of the interface type struct
* @interface_type_as_macro: the interface type macro
* @interface_as_function: the interface function name prefix
*
* 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 = (gboolean (*)(GstImplementsInterface*, GType))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)
/**
* GST_CALL_PARENT:
* @parent_class_cast: the name of the class cast macro for the parent type
* @name: name of the function to call
* @args: arguments enclosed in '( )'
*
* 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)
/**
* GST_CALL_PARENT_WITH_DEFAULT:
* @parent_class_cast: the name of the class cast macro for the parent type
* @name: name of the function to call
* @args: arguments enclosed in '( )'
* @def_return: default result
*
* Same as GST_CALL_PARENT(), 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))))
/**
* GST_READ_UINT64_BE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT64_BE(data) _GST_GET (data, 64, BE)
/**
* GST_READ_UINT64_LE:
* @data: memory location
*
* Read a 64 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT64_LE(data) _GST_GET (data, 64, LE)
/**
* GST_READ_UINT32_BE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT32_BE(data) _GST_GET (data, 32, BE)
/**
* GST_READ_UINT32_LE:
* @data: memory location
*
* Read a 32 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT32_LE(data) _GST_GET (data, 32, LE)
/**
* GST_READ_UINT16_BE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in big endian format from the memory buffer.
*/
#define GST_READ_UINT16_BE(data) _GST_GET (data, 16, BE)
/**
* GST_READ_UINT16_LE:
* @data: memory location
*
* Read a 16 bit unsigned integer value in little endian format from the memory buffer.
*/
#define GST_READ_UINT16_LE(data) _GST_GET (data, 16, LE)
/**
* GST_READ_UINT8:
* @data: memory location
*
* Read an 8 bit unsigned integer value from the memory buffer.
*/
#define GST_READ_UINT8(data) (* ((guint8 *) (data)))
#define _GST_PUT(__data, __size, __end, __num) \
((* (guint##__size *) (__data)) = GUINT##__size##_TO_##__end (__num))
/**
* GST_WRITE_UINT64_BE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_BE(data, num) _GST_PUT(data, 64, BE, num)
/**
* GST_WRITE_UINT64_LE:
* @data: memory location
* @num: value to store
*
* Store a 64 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT64_LE(data, num) _GST_PUT(data, 64, LE, num)
/**
* GST_WRITE_UINT32_BE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_BE(data, num) _GST_PUT(data, 32, BE, num)
/**
* GST_WRITE_UINT32_LE:
* @data: memory location
* @num: value to store
*
* Store a 32 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT32_LE(data, num) _GST_PUT(data, 32, LE, num)
/**
* GST_WRITE_UINT16_BE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in big endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_BE(data, num) _GST_PUT(data, 16, BE, num)
/**
* GST_WRITE_UINT16_LE:
* @data: memory location
* @num: value to store
*
* Store a 16 bit unsigned integer value in little endian format into the memory buffer.
*/
#define GST_WRITE_UINT16_LE(data, num) _GST_PUT(data, 16, LE, num)
/**
* GST_WRITE_UINT8:
* @data: memory location
* @num: value to store
*
* Store an 8 bit unsigned integer value into the memory buffer.
*/
#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 */
/**
* GST_ROUND_UP_2:
* @num: value round up
*
* Make number divideable by two without a rest.
*/
#define GST_ROUND_UP_2(num) (((num)+1)&~1)
/**
* GST_ROUND_UP_4:
* @num: value round up
*
* Make number divideable by four without a rest.
*/
#define GST_ROUND_UP_4(num) (((num)+3)&~3)
/**
* GST_ROUND_UP_8:
* @num: value round up
*
* Make number divideable by eight without a rest.
*/
#define GST_ROUND_UP_8(num) (((num)+7)&~7)
/**
* GST_ROUND_UP_16:
* @num: value round up
*
* Make number divideable by 16 without a rest.
*/
#define GST_ROUND_UP_16(num) (((num)+15)&~15)
/**
* GST_ROUND_UP_32:
* @num: value round up
*
* Make number divideable by 32 without a rest.
*/
#define GST_ROUND_UP_32(num) (((num)+31)&~31)
/**
* GST_ROUND_UP_64:
* @num: value round up
*
* Make number divideable by 64 without a rest.
*/
#define GST_ROUND_UP_64(num) (((num)+63)&~63)
void gst_object_default_error (GstObject * source,
GError * error, gchar * debug);
/* element functions */
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, ...) G_GNUC_NULL_TERMINATED;
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, ...) G_GNUC_NULL_TERMINATED;
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);
/* 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);
gboolean gst_element_query_duration (GstElement *element, GstFormat *format,
gint64 *duration);
gboolean gst_element_query_convert (GstElement *element, GstFormat src_format, gint64 src_val,
GstFormat *dest_format, gint64 *dest_val);
/* element class functions */
void gst_element_class_install_std_props (GstElementClass * klass,
const gchar * first_name, ...) G_GNUC_NULL_TERMINATED;
/* 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);
/* util query functions */
gboolean gst_pad_query_position (GstPad *pad, GstFormat *format,
gint64 *cur);
gboolean gst_pad_query_duration (GstPad *pad, GstFormat *format,
gint64 *duration);
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, ...) G_GNUC_NULL_TERMINATED;
void gst_bin_remove_many (GstBin *bin, GstElement *element_1, ...) G_GNUC_NULL_TERMINATED;
GstPad * gst_bin_find_unconnected_pad (GstBin *bin, GstPadDirection direction);
/* 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);
#ifndef GST_DISABLE_PARSE
/* parse utility functions */
GstElement * gst_parse_bin_from_description (const gchar * bin_description,
gboolean ghost_unconnected_pads,
GError ** err);
#else /* GST_DISABLE_PARSE */
#if defined _GNUC_ && _GNUC_ >= 3
#pragma GCC poison gst_parse_bin_from_description
#endif
#endif
G_END_DECLS
#endif /* __GST_UTILS_H__ */
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