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272 lines
11 KiB
C
272 lines
11 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstutils.h: Header for various utility functions
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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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#ifndef __GST_UTILS_H__
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#define __GST_UTILS_H__
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#include <glib.h>
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#include <gst/gstbin.h>
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G_BEGIN_DECLS
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void gst_util_set_value_from_string (GValue *value, const gchar *value_str);
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void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value);
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void gst_util_dump_mem (const guchar *mem, guint size);
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void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
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void gst_print_element_args (GString *buf, gint indent, GstElement *element);
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/* Macros for defining classes. Ideas taken from Bonobo, which took theirs
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from Nautilus and GOB. */
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/* Define the boilerplate type stuff to reduce typos and code size. Defines
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the get_type method and the parent_class static variable.
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void additional_initializations (GType type) is for initializing interfaces
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and stuff like that */
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#define GST_BOILERPLATE_FULL(type, type_as_function, parent_type, parent_type_macro, additional_initializations) \
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\
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static void type_as_function ## _base_init (gpointer g_class); \
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static void type_as_function ## _class_init (type ## Class *g_class); \
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static void type_as_function ## _init (type *object); \
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static parent_type ## Class *parent_class = NULL; \
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static void \
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type_as_function ## _class_init_trampoline (gpointer g_class, \
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gpointer data) \
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{ \
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parent_class = (parent_type ## Class *) g_type_class_peek_parent (g_class); \
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type_as_function ## _class_init ((type ## Class *)g_class); \
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} \
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\
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GType \
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type_as_function ## _get_type (void) \
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{ \
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static GType object_type = 0; \
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if (object_type == 0) { \
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static const GTypeInfo object_info = { \
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sizeof (type ## Class), \
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type_as_function ## _base_init, \
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NULL, /* base_finalize */ \
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type_as_function ## _class_init_trampoline, \
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NULL, /* class_finalize */ \
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NULL, /* class_data */ \
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sizeof (type), \
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0, /* n_preallocs */ \
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(GInstanceInitFunc) type_as_function ## _init \
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}; \
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object_type = g_type_register_static (parent_type_macro, #type, \
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&object_info, (GTypeFlags) 0); \
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additional_initializations (object_type); \
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} \
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return object_type; \
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}
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#define __GST_DO_NOTHING(type) /* NOP */
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#define GST_BOILERPLATE(type,type_as_function,parent_type,parent_type_macro) \
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GST_BOILERPLATE_FULL (type, type_as_function, parent_type, parent_type_macro, \
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__GST_DO_NOTHING)
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/* Just call the parent handler. This assumes that there is a variable
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* named parent_class that points to the (duh!) parent class. Note that
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* this macro is not to be used with things that return something, use
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* the _WITH_DEFAULT version for that */
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#define GST_CALL_PARENT(parent_class_cast, name, args) \
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((parent_class_cast(parent_class)->name != NULL) ? \
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parent_class_cast(parent_class)->name args : (void) 0)
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/* Same as above, but in case there is no implementation, it evaluates
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* to def_return */
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#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args, def_return) \
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((parent_class_cast(parent_class)->name != NULL) ? \
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parent_class_cast(parent_class)->name args : def_return)
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/* Define possibly unaligned memory access method whether the type of
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* architecture. */
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#if GST_HAVE_UNALIGNED_ACCESS
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#define _GST_GET(__data, __size, __end) \
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(GUINT##__size##_FROM_##__end (* ((guint##__size *) (__data))))
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#define GST_READ_UINT64_BE(data) _GST_GET (data, 64, BE)
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#define GST_READ_UINT64_LE(data) _GST_GET (data, 64, LE)
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#define GST_READ_UINT32_BE(data) _GST_GET (data, 32, BE)
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#define GST_READ_UINT32_LE(data) _GST_GET (data, 32, LE)
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#define GST_READ_UINT16_BE(data) _GST_GET (data, 16, BE)
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#define GST_READ_UINT16_LE(data) _GST_GET (data, 16, LE)
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#define GST_READ_UINT8(data) (* ((guint8 *) (data)))
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#define _GST_PUT(__data, __size, __end, __num) \
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((* (guint##__size *) (__data)) = GUINT##__size##_TO_##__end (__num))
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#define GST_WRITE_UINT64_BE(data, num) _GST_PUT(data, 64, BE, num)
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#define GST_WRITE_UINT64_LE(data, num) _GST_PUT(data, 64, LE, num)
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#define GST_WRITE_UINT32_BE(data, num) _GST_PUT(data, 32, BE, num)
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#define GST_WRITE_UINT32_LE(data, num) _GST_PUT(data, 32, LE, num)
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#define GST_WRITE_UINT16_BE(data, num) _GST_PUT(data, 16, BE, num)
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#define GST_WRITE_UINT16_LE(data, num) _GST_PUT(data, 16, LE, num)
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#define GST_WRITE_UINT8(data, num) ((* (guint8 *) (data)) = (num))
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#else /* GST_HAVE_UNALIGNED_ACCESS */
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#define _GST_GET(__data, __idx, __size, __shift) \
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(((guint##__size) (((guint8 *) (__data))[__idx])) << __shift)
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#define GST_READ_UINT64_BE(data) (_GST_GET (data, 0, 64, 56) | \
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_GST_GET (data, 1, 64, 48) | \
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_GST_GET (data, 2, 64, 40) | \
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_GST_GET (data, 3, 64, 32) | \
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_GST_GET (data, 4, 64, 24) | \
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_GST_GET (data, 5, 64, 16) | \
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_GST_GET (data, 6, 64, 8) | \
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_GST_GET (data, 7, 64, 0))
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#define GST_READ_UINT64_LE(data) (_GST_GET (data, 7, 64, 56) | \
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_GST_GET (data, 6, 64, 48) | \
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_GST_GET (data, 5, 64, 40) | \
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_GST_GET (data, 4, 64, 32) | \
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_GST_GET (data, 3, 64, 24) | \
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_GST_GET (data, 2, 64, 16) | \
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_GST_GET (data, 1, 64, 8) | \
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_GST_GET (data, 0, 64, 0))
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#define GST_READ_UINT32_BE(data) (_GST_GET (data, 0, 32, 24) | \
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_GST_GET (data, 1, 32, 16) | \
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_GST_GET (data, 2, 32, 8) | \
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_GST_GET (data, 3, 32, 0))
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#define GST_READ_UINT32_LE(data) (_GST_GET (data, 3, 32, 24) | \
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_GST_GET (data, 2, 32, 16) | \
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_GST_GET (data, 1, 32, 8) | \
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_GST_GET (data, 0, 32, 0))
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#define GST_READ_UINT16_BE(data) (_GST_GET (data, 0, 16, 8) | \
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_GST_GET (data, 1, 16, 0))
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#define GST_READ_UINT16_LE(data) (_GST_GET (data, 1, 16, 8) | \
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_GST_GET (data, 0, 16, 0))
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#define GST_READ_UINT8(data) (_GST_GET (data, 0, 8, 0))
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#define _GST_PUT(__data, __idx, __size, __shift, __num) \
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(((guint8 *) (__data))[__idx] = (((guint##__size) __num) >> __shift) & 0xff)
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#define GST_WRITE_UINT64_BE(data, num) do { \
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_GST_PUT (data, 0, 64, 56, num); \
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_GST_PUT (data, 1, 64, 48, num); \
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_GST_PUT (data, 2, 64, 40, num); \
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_GST_PUT (data, 3, 64, 32, num); \
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_GST_PUT (data, 4, 64, 24, num); \
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_GST_PUT (data, 5, 64, 16, num); \
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_GST_PUT (data, 6, 64, 8, num); \
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_GST_PUT (data, 7, 64, 0, num); \
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} while (0)
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#define GST_WRITE_UINT64_LE(data, num) do { \
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_GST_PUT (data, 0, 64, 0, num); \
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_GST_PUT (data, 1, 64, 8, num); \
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_GST_PUT (data, 2, 64, 16, num); \
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_GST_PUT (data, 3, 64, 24, num); \
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_GST_PUT (data, 4, 64, 32, num); \
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_GST_PUT (data, 5, 64, 40, num); \
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_GST_PUT (data, 6, 64, 48, num); \
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_GST_PUT (data, 7, 64, 56, num); \
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} while (0)
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#define GST_WRITE_UINT32_BE(data, num) do { \
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_GST_PUT (data, 0, 32, 24, num); \
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_GST_PUT (data, 1, 32, 16, num); \
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_GST_PUT (data, 2, 32, 8, num); \
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_GST_PUT (data, 3, 32, 0, num); \
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} while (0)
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#define GST_WRITE_UINT32_LE(data, num) do { \
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_GST_PUT (data, 0, 32, 0, num); \
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_GST_PUT (data, 1, 32, 8, num); \
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_GST_PUT (data, 2, 32, 16, num); \
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_GST_PUT (data, 3, 32, 24, num); \
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} while (0)
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#define GST_WRITE_UINT16_BE(data, num) do { \
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_GST_PUT (data, 0, 16, 8, num); \
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_GST_PUT (data, 1, 16, 0, num); \
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} while (0)
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#define GST_WRITE_UINT16_LE(data, num) do { \
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_GST_PUT (data, 0, 16, 0, num); \
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_GST_PUT (data, 1, 16, 8, num); \
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} while (0)
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#define GST_WRITE_UINT8(data, num) do { \
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_GST_PUT (data, 0, 8, 0, num); \
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} while (0)
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#endif /* GST_HAVE_UNALIGNED_ACCESS */
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void gst_object_default_error (GstObject * source,
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GError * error, gchar * debug);
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/* element functions */
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GstFlowReturn gst_element_abort_preroll (GstElement *element);
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GstFlowReturn gst_element_finish_preroll (GstElement *element, GMutex *streamlock);
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GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
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GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
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const GstCaps *filtercaps);
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GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
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G_CONST_RETURN gchar* gst_element_state_get_name (GstElementState state);
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GstPadLinkReturn gst_element_link (GstElement *src, GstElement *dest);
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GstPadLinkReturn gst_element_link_many (GstElement *element_1,
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GstElement *element_2, ...);
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GstPadLinkReturn gst_element_link_filtered (GstElement *src, GstElement *dest,
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const GstCaps *filtercaps);
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void gst_element_unlink (GstElement *src, GstElement *dest);
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void gst_element_unlink_many (GstElement *element_1,
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GstElement *element_2, ...);
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GstPadLinkReturn gst_element_link_pads (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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GstPadLinkReturn gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname,
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const GstCaps *filtercaps);
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void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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/* pad functions */
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gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_can_link_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
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/* bin functions */
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void gst_bin_add_many (GstBin *bin, GstElement *element_1, ...);
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void gst_bin_remove_many (GstBin *bin, GstElement *element_1, ...);
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G_END_DECLS
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#endif /* __GST_UTILS_H__ */
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