/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * 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 #include 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); 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); \ 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) /* 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 */ 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, GMutex *streamlock); GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad); GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad, const GstCaps *filtercaps); GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl); G_CONST_RETURN gchar* gst_element_state_get_name (GstElementState state); GstPadLinkReturn gst_element_link (GstElement *src, GstElement *dest); GstPadLinkReturn gst_element_link_many (GstElement *element_1, GstElement *element_2, ...); GstPadLinkReturn gst_element_link_filtered (GstElement *src, GstElement *dest, const GstCaps *filtercaps); void gst_element_unlink (GstElement *src, GstElement *dest); void gst_element_unlink_many (GstElement *element_1, GstElement *element_2, ...); GstPadLinkReturn gst_element_link_pads (GstElement *src, const gchar *srcpadname, GstElement *dest, const gchar *destpadname); GstPadLinkReturn gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname, GstElement *dest, const gchar *destpadname, const GstCaps *filtercaps); void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname, GstElement *dest, const gchar *destpadname); /* 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); gboolean gst_pad_can_link_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps); void gst_pad_use_fixed_caps (GstPad *pad); GstCaps* gst_pad_get_fixed_caps_func (GstPad *pad); /* bin functions */ void gst_bin_add_many (GstBin *bin, GstElement *element_1, ...); void gst_bin_remove_many (GstBin *bin, GstElement *element_1, ...); G_END_DECLS #endif /* __GST_UTILS_H__ */