This prevents adding duplicates over and over again to the resulting
caps if they already describe the new intersection result.
While this changes intersection from O(n*m) to O(n^2*m), it results in
smaller caps, which in the end will decrease further processing times.
For example in an audioconvert ! audioconvert ! audioconvert pipeline,
when forwarding the downstream caps preference in basetransform
(see e26da72de25a91c3eaad9f7c8b2f53ba888a0394) this results in
16 instead of 191 caps structures.
gst_structure_get_type() -> _gst_structure_type to avoid method calls for
getting the GType that initialized at the start.
Hide some structure fields in private data so that we can change the
implementation.
Move structure equality check from caps.c to structure.c where it belongs.
This prevents adding duplicates over and over again to the resulting
caps if they already describe the new intersection result.
While this changes intersection from O(n*m) to O(n^2*m), it results in
smaller caps, which in the end will decrease further processing times.
For example in an audioconvert ! audioconvert ! audioconvert pipeline,
when forwarding the downstream caps preference in basetransform
(see e26da72de25a91c3eaad9f7c8b2f53ba888a0394) this results in
16 instead of 191 caps structures.
Just like gst_caps_intersect, but adds a new parameter 'mode'
that allows selecting the intersection algorithm to use.
Currently we have GST_CAPS_INTERSECT_MODE_ZIG_ZAG (default) and
GST_CAPS_INTERSECT_MODE_FIRST.
API: gst_caps_intersect_full
API: GstCapsIntersectMode
API: GST_CAPS_INTERSECT_MODE_ZIG_ZAG
API: GST_CAPS_INTERSECT_MODE_FIRST
https://bugzilla.gnome.org/show_bug.cgi?id=617045
Check if structure has been created before appending it to the caps. Free the
caps in the case of an error to not conceal it be returning empty caps.
Fixes#642271
Since everything GstXML related has been deprecated, we can now skip the
libxml includes from the public headers when GST_DISABLE_DEPRECATED is
defined.
See #463435.
Pipeline serialisation to and from XML is horribly broken for all
but the most simple use cases, and will likely never be fixed.
Make sure everyone playing around with these tools is aware of
this, to avoid frustration. See countless bug reports in bugzilla.
Fixes bug #622685.
This allows removing structures from caps without them being freed. Helpful when
plugins need to move around structures without having to do an expensive structure
copy.
API:gst_caps_steal_structure
https://bugzilla.gnome.org/show_bug.cgi?id=621527
This makes it possible to easily get a *:5 debug log without all
the refcounting noise, and drastically reduces the number of lines
output for a normal log (46m to 28m for a 20min video). The full log
including refcounting information can still be gotten using *:7.
Fixes#620460.
This avoids creating empty caps and destroying them in the case of an error. We
also avoid double checking in other code path where we call the internal api.
This brings total call speedups between 5% and 25%.
gst_caps_set_simple_valist: +5%
gst_structure_set_valist: + 10%
gst_structure_id_set_valist: +25%
gst_tag_list_add_valist: +5%
Measured using valgrind when run over the discovery of 200 media files.
Fixes#610256
CAPS_IS_ANY and CAPS_IS_EMPTY are the equivalent of their gst_caps_*
counterpart except that they avoid the typechecking and are inlined.
CAPS_IS_EMPTY_SIMPLE only checks for empty caps (without checking if
the caps is ANY).
This patch adds gst_caps_set_value() and allows gst_caps_set_simple() to
work on non-simple caps. See the API documentation for the functions
about what they do.
The intention of these changes is to ease working with caps in caps
transform functions. An example for this would be ffmpegcolorspace,
where the caps transform function could be changed to look roughly like
this (pseudocode ahead):
result = gst_caps_copy (template_caps);
value = gst_structure_get_value (gst_caps_get_structure (caps, 0),
"widh");
gst_caps_set_value (result, value);
/* same for height, framerate and par */
return caps;
which is much cleaner and easier to understand than the current code.
https://bugzilla.gnome.org/show_bug.cgi?id=597690
Often we don't need the result of the intersection. Add a variant that only
tries to intersect. It can break out earlier and does less GValue copying.
API: gst_caps_can_intersect()
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_copy), (_gst_caps_free),
(gst_caps_merge_structure), (gst_caps_get_structure),
(gst_caps_copy_nth), (gst_caps_set_simple),
(gst_caps_set_simple_valist), (gst_caps_is_fixed),
(gst_caps_is_equal_fixed), (gst_caps_intersect),
(gst_caps_subtract), (gst_caps_normalize), (gst_caps_do_simplify),
(gst_caps_to_string):
Callgrind micro optimisations.
Avoid array bounds checks and force inline of trivial function.
* gst/gstobject.c: (gst_object_set_name_default):
-1 is equivalent to letting glib to the strlen but then there is more
room for optimisations and it's not our fault.
* gst/gststructure.c: (gst_structure_id_empty_new_with_size):
no need to clear the array, we're cool.
* gst/gstvalue.c: (gst_type_is_fixed), (gst_value_is_fixed):
The most common _is_fixed() check is done on fundamental glib base
types so we check this first instead of doing a huge amount of
useless GST_TYPE_ARRAY calls.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_structure_is_subset_field):
Fix subset test.
* tests/check/gst/gstcaps.c: (GST_START_TEST):
Improve unit test subset tests and add a testcase for the subset failure
cases.
* tests/check/gst/gstvalue.c: (GST_START_TEST), (gst_value_suite):
Improve subtraction unit test.
Original commit message from CVS:
* gst/gstcaps.c:
Previous commit was wrong NULL caps does not exist
and indicate an error, so also add a FIXME to
gst_caps_is_equal where NULL caps are accepted.
Original commit message from CVS:
* gst/gstcaps.c: (gst_static_caps_get):
* gst/gstclock.c: (gst_clock_entry_new):
Don't use g_atomic_set_int where it's not needed.
Original commit message from CVS:
* gst/gstutils.c:
* gst/gstutils.h:
API: Deprecate gst_atomic_int_set(), g_atomic_int_set() should be used
now that we depend on new enough GLib.
* gst/gstcaps.c: (gst_static_caps_get):
* gst/gstclock.c: (gst_clock_entry_new):
* gst/gstinfo.c: (_gst_debug_init), (gst_debug_set_colored),
(gst_debug_set_default_threshold), (_gst_debug_category_new),
(gst_debug_category_set_threshold):
* libs/gst/base/gstbasesink.c: (gst_base_sink_init),
(gst_base_sink_set_qos_enabled):
* libs/gst/net/gstnettimeprovider.c:
(gst_net_time_provider_set_property):
Use g_atomic_int_set() instead of gst_atomic_int_set().
Original commit message from CVS:
Patch by: José Alburquerque <jaalburqu at svn dot gnome dot org>
* gst/gstcaps.c: (gst_caps_set_simple),
(gst_caps_set_simple_valist), (gst_caps_intersect):
* gst/gstcaps.h:
Constify the field gchar * params in set_simple and friends.
Fixes#522326.
Original commit message from CVS:
* gst/gst_private.h: (STRUCTURE_ESTIMATED_STRING_LEN):
* gst/gstcaps.c: (gst_caps_to_string):
* gst/gststructure.c: (GST_ASCII_IS_STRING),
(priv_gst_structure_append_to_gstring), (gst_structure_to_string):
Yet another gratuitous GString micro-optimisation: add a (private)
function that serialises a structure appending to an existing
GString, so that when we serialise caps we don't need to alloc+free
a throwaway GString for each structure (each of which also entailing
multiple reallocs on the way); also use g_string_sized_new() in
various places with an approximate string length to avoid reallocs
within GString. See #500143.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_to_string),
(gst_caps_from_string_inplace):
* gst/gststructure.c: (gst_structure_get_abbrs),
(gst_structure_to_string), (gst_structure_from_string):
* gst/gstvalue.c: (gst_value_set_structure),
(gst_value_get_structure), (gst_value_serialize_structure),
(gst_value_deserialize_structure), (_gst_value_initialize):
* gst/gstvalue.h:
* tests/check/gst/gststructure.c: (GST_START_TEST),
(gst_structure_suite):
* tests/check/gst/gstvalue.c: (GST_START_TEST):
Added GstStructure to gst_value_table and its related functions.
Changed gst_structure_to_string to print ';' in the end.
Changed gst_caps_to_string to not print ';' beteween its
fields (structures) anymore and remove the lastes ';' from latest
structure. Now it is possible to have nested structures.
In addition, backward compatibilty is assured by accepting '\0' as
end delimiter. Fixes: #487969.
API: add gst_value_set_structure()
API: add gst_value_get_structure()
Original commit message from CVS:
* docs/design/part-TODO.txt:
Add some more TODO items
* gst/gstbin.c: (find_message), (gst_bin_change_state_func):
Improve debugging.
* gst/gstcaps.c: (gst_caps_intersect):
Optimize trivial intersection case between identical caps pointers.
* gst/gstelement.c: (gst_element_continue_state),
(gst_element_set_state_func):
* gst/gstpad.c:
Fix spelling and grammar mistakes.
Original commit message from CVS:
* docs/design/draft-klass.txt:
Add existing category analysis.
* gst/gstcaps.c:
Fix doc example, framerate is a fraction.
Original commit message from CVS:
* gst/gstcaps.c: (_gst_caps_free), (gst_static_caps_get):
Add some refcount debugging.
Make gst_static_caps_get threadsafe, which is needed when autoplugging
in multiple streaming threads.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_merge_structure):
* gst/gstcaps.h:
Fix docs and indentation again.
* tests/check/gst/gstquery.c: (GST_START_TEST):
Fix leak in tests and add some more tests.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstcaps.c: (gst_structure_is_equal_foreach),
(gst_caps_merge):
* gst/gstcaps.h:
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_transform_caps):
API: Add gst_caps_merge() and use it in basetransform, fixes#345444
in a better way
Original commit message from CVS:
* gst/gstcaps.c: (gst_static_caps_get), (gst_caps_get_structure):
Fix useless assert, a uint is always positive.
* gst/gststructure.c: (gst_structure_nth_field_name),
(gst_structure_foreach), (gst_structure_map_in_place):
Check input arguments for public functions to avoid obvious crashes.
* plugins/elements/gstfakesink.c: (gst_fake_sink_render):
* plugins/elements/gstfakesink.h:
Do less useless typechecking.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_new_empty), (_gst_caps_free),
(gst_caps_unref), (gst_static_caps_get),
(gst_caps_append_structure):
* gst/gstclock.c: (gst_clock_entry_new), (_gst_clock_id_free):
Use GSlice when the glib we build against is >= 2.10
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_remove_and_get_structure):
remove gst_caps_simplify; it was not declared and not used
and deprecated in 0.8
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_replace):
Fix crasher when passed NULL. Doc clarification.
Optimize for the trivial case.
* gst/gstpipeline.c: (gst_pipeline_change_state):
Small cleanups.
* libs/gst/base/gstbasesrc.c: (gst_base_src_loop):
Small documentation cleanup.
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_buffer_alloc):
Don't use silly gst_pad_get_negotiated_caps, GST_PAD_CAPS
is what we need and it avoids a whole lot of redundant
refcount operations.
Original commit message from CVS:
* gst/gstcaps.c:
Docs about how to print caps for debug purposes.
* gst/gstpadtemplate.c: (gst_static_pad_template_get):
use gst_caps_make_writable instead of gst_caps_copy, Fixes#340608
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_get_type), (gst_bin_handle_message_func):
Help the compiler a bit with type registration.
Use existing forward cod path instead of duplicating it when
handling a message.
* gst/gstbus.c: (gst_bus_get_type):
* gst/gstcaps.c: (gst_caps_get_type), (gst_static_caps_get_type):
* gst/gstchildproxy.c: (gst_child_proxy_get_type):
* gst/gstclock.c: (gst_clock_get_type):
* gst/gstelement.c: (gst_element_get_type),
* gst/gstelementfactory.c: (gst_element_factory_get_type):
* gst/gstindexfactory.c: (gst_index_factory_get_type):
* gst/gstminiobject.c: (gst_mini_object_get_type):
* gst/gstpad.c: (gst_pad_get_type):
* gst/gstsegment.c: (gst_segment_get_type):
* gst/gststructure.c: (gst_structure_get_type):
* gst/gstsystemclock.c: (gst_system_clock_get_type):
* gst/gsttask.c: (gst_task_get_type), (gst_task_join):
* gst/gstvalue.c:
Help compiler with type registration.
* plugins/elements/gstqueue.c: (gst_queue_handle_sink_event):
Small doc update.
Original commit message from CVS:
* gst/gstcaps.c:
Clarify behaviour of _is_equal() when passing NULL parameters.
* gst/gstpad.c: (gst_pad_link_check_compatible_unlocked),
(gst_pad_set_caps):
Cleanups. Don't unref NULL caps.
When setting the same caps, protect caps of the pad with
proper lock.
Use full functionality of _is_equal() when comparing caps.
Original commit message from CVS:
* gst/gstcaps.c: (gst_static_caps_get_type):
* gst/gstcaps.h:
Added gpointer GType for GstStaticCaps so we can wrap them in bindings.
* gst/gstpadtemplate.c: (gst_static_pad_template_get_type):
* gst/gstpadtemplate.h:
Added gpointer GType for GstStaticPadTemplate so we can wrap them in
bindings.
Original commit message from CVS:
* gst/gstbuffer.c:
Small docs update.
* gst/gstcaps.c: (gst_caps_is_equal):
Don't assert on NULL <--> X. Fixes#323260
* gst/gstminiobject.c: (gst_mini_object_replace):
If we're doing atomic operations, we might just as well use
the proper way to get an atomic pointer.
* libs/gst/base/gstbasesink.c: (gst_base_sink_get_position):
Clean up debugging.
Original commit message from CVS:
* gst/gstbuffer.c: (_gst_buffer_copy):
Copy more flags.
* gst/gstcaps.c: (gst_caps_is_equal):
Fix some docs.
Make _is_equal fast in the trivial cases.
* gst/gstminiobject.c:
* gst/gstminiobject.h:
More docs. Spifify .h file.
* gst/gstutils.c:
Small doc update.
Original commit message from CVS:
* gst/base/gstbasetransform.c: (gst_base_transform_transform_caps):
* gst/gstcaps.c: (gst_caps_intersect):
Don't call gst_caps_do_simplify - it doesn't respect order of caps
and it's not needed.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_intersect):
fix signedness issues in a (hopefully) correct way
* gst/gstelement.c: (gst_element_pads_activate):
some debugging
* gst/gstobject.c: (gst_object_set_parent):
some debugging
Original commit message from CVS:
* configure.ac:
clean up further
* gst/gst.c: (init_post):
* win32/common/config.h.in:
it's PLUGINDIR now
* gst/gstcaps.c: (gst_caps_intersect):
use gint64, the range could be bigger than a guint
Original commit message from CVS:
2005-10-16 Julien MOUTTE <julien@moutte.net>
* gst/gstcaps.c: (gst_caps_intersect): Fix a bad bug with a
simple
fix. Because of unsigned ints, caps intersection was going nuts
and
trying to access structures with G_MAXUINT index. That fixes
videotestsrc ! ffmpegcolorspace ! fakesink
* gst/gstpad.c: (gst_pad_link_check_compatible_unlocked): logs
consistency.
Original commit message from CVS:
* gst/gstcaps.c:
* gst/gstevent.c:
doc updates
* gst/gstvalue.c: (gst_value_deserialize_int_helper):
don't use long long, it's not portable. Replacing with
gint64 seems to work; let's hope no skeletons fall out of the closet.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_do_simplify):
Thou shalt not free a structure and then continue using it
in the next loop iteration.
* check/gst/gstcaps.c: (check_fourcc_list), (test_simplify),
(gst_caps_suite):
Add test case for caps simplification.
Original commit message from CVS:
* gst/gstcaps.c: (gst_static_caps_get), (gst_caps_to_string):
Make _static_caps_get() refcounting sane.
* gst/gstelement.c: (gst_element_set_state):
Add g_return_val_if_fail() to protect against segfaults.
Original commit message from CVS:
2005-07-15 Andy Wingo <wingo@pobox.com>
* tools/gst-typefind.c: Update, add copyright block.
* gst/base/gstbasesrc.c (gst_base_src_default_negotiate):
Normalize and truncate caps before fixation.
* gst/gstcaps.h:
* gst/gstcaps.c (gst_caps_truncate): New function, destructively
discards all but the first structure from its argument.
Original commit message from CVS:
2005-07-01 Andy Wingo <wingo@pobox.com>
* tests/network-clock.scm: Commentary update.
* gst/elements/gstidentity.c (PROP_DUPLICATE): Gone daddy gone.
Didn't really make sense, not implementable with basetransform,
etc.
(gst_identity_transform): Unref inbuf via make_writable. Feeble
attempt at implementing the sync property, needs an unlock method.
* gst/base/gstbasetransform.c (gst_base_transform_transform_caps):
New func, by default returns the same caps (the identity
transformation).
(gst_base_transform_getcaps): Uses transform_caps to return
something sensible.
(gst_base_transform_setcaps): Complicated logic to get caps on
both pads, even if they are different, and to call set_caps once
for every time both pads get their caps set.
(gst_base_transform_handle_buffer): Give the ref to the transform
function. Allows in-place modification of the buffer.
* gst/base/gstbasetransform.h (transform_caps): New class method.
Given caps on one side, what can I do on the other.
(set_caps): Take two caps, one for each side of the element.
* gst/gstpad.h:
* gst/gstpad.c (gst_pad_fixate_caps): Change prototype to modify
caps in place. This is safe because we can check the mutability of
the caps, and a good idea because fixate functions are just called
as a matter of last resort. (Not actually implemented.)
(gst_pad_set_caps): If the caps we're setting is actually the same
as the existing pad caps, just update the pointer without calling
setcaps. Assert that caps is either NULL or fixed, as per the
docs.
* gst/gstghostpad.c: Update for fixate changes.
Original commit message from CVS:
First THREADED backport attempt, focusing on adding locks and
making sure the API is threadsafe. Needs more work. More docs
follow this week.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_compare_structures):
Simple caps go first. This has the nice side-effect of fixing an
obscure warning.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_is_fixed_foreach):
* gst/gstpad.c: (_gst_pad_default_fixate_value),
(_gst_pad_default_fixate_foreach):
* gst/gstvalue.c: (gst_type_is_fixed), (gst_value_is_fixed):
* gst/gstvalue.h:
Deprecate _type_is_fixed, use _value_is_fixed instead, since
in some cases (arrays), the fixedness depends on the content.
* gst/gstqueue.c: (gst_queue_handle_src_query):
Check for availability before doing something.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_save_thyself), (gst_caps_load_thyself):
Actually do something in these functions, like before the big
caps change. (bug #145137)
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_structure_simplify):
don't print error messages when there is no error
* gst/gstvalue.c: (gst_value_compare_int_range):
compare the second value, too
* testsuite/caps/Makefile.am:
* testsuite/caps/random.c: (assert_on_error), (main):
add tests to make sure the two things above are checked for
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_structure_subtract_field),
(gst_caps_structure_subtract), (gst_caps_subtract),
(gst_caps_structure_figure_out_union),
(gst_caps_structure_simplify), (gst_caps_do_simplify):
fix simplifying and subtracting not working correctly with optional
properties
solve assorted problems that make it now simplify ebven more
* docs/gst/tmpl/gstcaps.sgml:
* gst/gstcaps.h:
make gst_caps_do_simplify return a bool to indicate if it simplified
* testsuite/caps/simplify.c: (main):
add more checks. The tests is quite a bit useless right now because
the core is heavily simplifying itself.
* testsuite/caps/caps.h:
fix caps to contain all optional properties
Original commit message from CVS:
* docs/gst/tmpl/gstcaps.sgml:
* docs/gst/tmpl/gstfilesrc.sgml:
* docs/gst/tmpl/gststructure.sgml:
* docs/gst/tmpl/gstvalue.sgml:
update for recent API changes
* gst/gstcaps.c: (gst_caps_do_simplify):
fix to stop trying with a freed structure
* gst/gstpad.c: (gst_pad_link_fixate):
simplify caps
* gst/gstpad.c: (gst_pad_template_get_caps_by_name):
remove C++ comment
* gst/gstpad.h:
deprecate gst_pad_template_get_caps_by_name, it doesn't work anyway
* gst/gststructure.c: (gst_structure_value_get_generic_type),
(gst_structure_to_string):
keep the correct type when using lists of ranges
* gst/gstvalue.c: (gst_value_list_prepend_value),
(gst_value_list_append_value):
copy the value before adding to the list (d'oh)
* gst/gstvalue.c: (gst_value_subtract_int_range_int),
(gst_value_subtract_int_range_int_range):
handle overflows correctly
* gst/gstvalue.c: (gst_value_subtract_from_list):
fix memleak
* testsuite/caps/caps.h:
add a caps that caused segfaults
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_append), (gst_caps_intersect),
(gst_caps_union):
only simplify in functions that create new caps. Simplifying in
gst_caps_append breaks tests.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
add gst_caps_do_simplify
* gst/gstcaps.c:
add documentation for gst_caps_do_simplify
* gst/gstvalue.h:
fix typo in gst_value_register_subtract_func declaration for gst-doc
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_from_string_inplace):
fix bug when converting from empty string.
* gst/gstcaps.c: (gst_caps_new_any), (gst_caps_new_simple),
(gst_caps_new_full_valist), (gst_caps_copy), (gst_caps_copy_1):
use gst_caps_new_empty to allocate a new caps. Only that function
allocates memory for caps now.
* gst/gstcaps.c: (gst_caps_remove_and_get_structure),
(gst_caps_remove_structure):
add ability to remove one structure (but not to header yet)
* gst/gstcaps.c: (gst_caps_compare_structures),
(gst_caps_simplify), (gst_caps_structure_figure_out_union),
(gst_caps_structure_simplify), (gst_caps_do_simplify),
* gst/gstcaps.h:
add gst_caps_do_simplify that tries to simplify a caps in place.
Deprecate old gst_caps_simplify function.
* testsuite/caps/caps.h:
add caps.h containing a common set of caps to test against.
* testsuite/caps/sets.c: (check_caps), (main):
use it.
* testsuite/caps/.cvsignore:
* testsuite/caps/Makefile.am:
* testsuite/caps/simplify.c: (check_caps), (main):
add test to check correctness and efficency of caps simplification.
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_is_fixed_foreach):
* gst/gstpad.c: (_gst_pad_default_fixate_foreach):
* gst/gstvalue.c: (gst_value_serialize_buffer),
(gst_value_deserialize_buffer), (gst_type_is_fixed),
(_gst_value_initialize): Create a new function gst_type_is_fixed()
to indicate types that are fixed wrt caps or not. Switching to
this function fixes (bug #140298).
* gst/gstvalue.h:
Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_structure_fixate_field_nearest_int),
(gst_caps_structure_fixate_field_nearest_double): Fix bug in
fixating lists.
Original commit message from CVS:
* gst/gstbuffer.c: (_gst_buffer_initialize), (gst_buffer_get_type),
(gst_buffer_free_chunk): Added gst_buffer_get_type() and changed
to using it.
* gst/gstbuffer.h: Changed GST_BUFFER_TYPE to gst_buffer_get_type()
* gst/gstcaps.c: (gst_caps_is_fixed_foreach): Buffer is a fixed type
* gst/gstpad.c: (_gst_pad_default_fixate_foreach): same
* gst/gststructure.c: (gst_structure_set_valist),
(gst_structure_from_abbr), (gst_structure_to_abbr): Add vararg
support for buffers.
* gst/gsttag.c: (gst_tag_register): Constify a prototype that was
intended to be const.
* gst/gsttag.h: same
* gst/gstvalue.c: (gst_value_serialize_buffer),
(gst_value_deserialize_buffer), (_gst_value_initialize): Add code
to (de)serialize buffers.
* testsuite/caps/Makefile.am: Add a bit of buffer testing
* testsuite/caps/string-conversions.c: (main):
* testsuite/caps/value_serialize.c: add new test
