Original commit message from CVS:
* gst/gstbuffer.c: (gst_buffer_finalize):
Avoid costly typechecking for trivially correct pointers.
* gst/gstpoll.c: (gst_poll_wait):
Add some G_LIKELY here and there.
* libs/gst/base/gstadapter.c: (gst_adapter_push):
Add some debug info.
Original commit message from CVS:
* gst/gstregistrybinary.c: (gst_registry_binary_write_chunk),
(gst_registry_binary_initialize_magic),
(gst_registry_binary_write_cache),
(gst_registry_binary_check_magic):
* gst/gstregistrybinary.h:
Don't write and check a CRC for the binary registry file. It's
guaranteed that the registry is completely written (it's first written
to a temporary file and then moved) and if the registry was corrupted
by some hardware failure we would have bigger problems.
Bump binary registry version to 0.10.21.1 for this as it's an
incompatible change and to ensure that the registry gets rebuild
after the update.
This saves some milliseconds for reading/writing the registry.
Fixes bug #560399.
Original commit message from CVS:
* gst/gstvalue.c: (gst_type_is_fixed), (gst_value_is_fixed):
Reorganize some more, be more conservative with the GST_TYPE_ARRAY not
being fixed and inline the trivial check.
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/gststructure.c: (gst_structure_id_empty_new_with_size):
No need to memset, we can clear the value ourselves.
* gst/gstvalue.c: (gst_type_is_fixed),
(gst_value_get_compare_func):
Some optimisations from a few callgrind sessions:
When checking if a type is fixed, check for trivial fundamental types
first before checking types for which we need to get the type followed
by the heavy duty type checks, this reduces the amount of
g_type_fundamental() calls a lot.
When getting the compare function, first check for our registered types.
If that fails, do the heavy duty g_type_is_a() checks, reduces the
amount of g_type_is_a() considerably.
Original commit message from CVS:
* gst/gstbin.c: (bin_handle_async_start),
(gst_bin_handle_message_func), (gst_bin_query):
* libs/gst/base/gstbasesink.c: (gst_base_sink_render_object),
(gst_base_sink_event), (gst_base_sink_change_state):
* libs/gst/base/gstbasesrc.c: (gst_base_src_perform_seek),
(gst_base_src_loop), (gst_base_src_change_state):
Copy seqnums from events to messages so that they can all be related
back to eachother.
Original commit message from CVS:
2008-11-04 Andy Wingo <wingo@pobox.com>
* gst/gstutils.c (gst_util_seqnum_next): Refactor for clarity.
Also add API: to previous changelog entry.
Original commit message from CVS:
2008-11-04 Andy Wingo <wingo@pobox.com>
Add sequence numbers to events and messages. See #559250.
* gst/gstutils.c (gst_util_seqnum_next, gst_util_seqnum_compare):
New functions.
* gst/gstevent.h:
* gst/gstevent.c (_gst_event_copy, gst_event_new): Initialize new
events with a new sequence number, and copy it when copying.
(gst_event_get_seqnum, gst_event_set_seqnum): Accessors for an
event's sequence number.
* gst/gstmessage.h:
* gst/gstmessage.c (_gst_message_copy, gst_message_new_custom):
(gst_event_get_seqnum, gst_event_set_seqnum): As with events, so
with messages.
* docs/gst/gstreamer-sections.txt: Add new functions to the docs.
Original commit message from CVS:
* gst/gstsegment.c: (gst_segment_set_newsegment_full):
Set the last_stop to a more meaningful position when configuring the
segment. ie. the start/stop of the segment or clipped against the
updated segment boundaries.
* tests/check/gst/gstsegment.c: (GST_START_TEST):
Add some unit tests for the last_stop.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstutils.h:
API: Move float endianness conversion macros from libgstfloatcast
to core as it's useful in general, even in core. Fixes bug #555196.
This adds GDOUBLE_FROM_BE, GDOUBLE_FROM_LE, GDOUBLE_TO_BE,
GDOUBLE_TO_LE, GDOUBLE_SWAP_LE_BE, GFLOAT_FROM_BE, GFLOAT_FROM_LE,
GFLOAT_TO_BE, GFLOAT_TO_LE, GFLOAT_SWAP_LE_BE.
Also add GST_READ_ and GST_WRITE_ macros for floats and doubles:
GST_READ_FLOAT_LE, GST_READ_FLOAT_BE, GST_READ_DOUBLE_LE,
GST_READ_DOUBLE_BE, GST_WRITE_FLOAT_LE, GST_WRITE_FLOAT_BE,
GST_WRITE_DOUBLE_LE, GST_WRITE_DOUBLE_BE.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_configure_src):
When we use gst_pad_alloc_buffer() without wanting to set the caps we
also don't need to check if the caps are compatible because the caller
presumably is going to perform its own custom checks. Fixes some cases
where basetransform elements would error out when it was not needed.
Original commit message from CVS:
* docs/design/part-TODO.txt:
Remove item from the todo list because it was fixed with the latency
state change rewrites.
* docs/design/part-seeking.txt:
* docs/design/part-segments.txt:
Update some docs.
* gst/gstevent.c: (gst_event_new_new_segment_full),
(gst_event_parse_new_segment_full), (gst_event_new_buffer_size),
(gst_event_parse_buffer_size), (gst_event_new_qos),
(gst_event_parse_qos), (gst_event_new_seek),
(gst_event_parse_seek), (gst_event_new_latency),
(gst_event_parse_latency):
Use quarks to construct and parse events.
* gst/gstquark.c: (_priv_gst_quarks_initialize):
* gst/gstquark.h:
Add some more quarks to the table.
Emit a warning when the quark tables are not in sync.
* tests/check/gst/gstbus.c: (GST_START_TEST):
Add an assert.
Original commit message from CVS:
* gst/gstbus.c: (gst_bus_source_finalize),
(gst_bus_add_watch_full_unlocked), (gst_bus_add_watch_full),
(gst_bus_enable_sync_message_emission),
(gst_bus_disable_sync_message_emission),
(gst_bus_add_signal_watch_full), (gst_bus_remove_signal_watch):
Fix deadlock, g_source_get_id() cannot be called in finalize.
Keep track of the watch source by keeping a pointer to the source object
instead.
Use the bus lock to protect access to the pointer to the current
watch source.
Original commit message from CVS:
Base on Patch by: Olivier Crete <tester at tester dot ca>
* gst/gstbus.c: (gst_bus_source_finalize),
(gst_bus_add_watch_full), (gst_bus_add_signal_watch_full):
Only allow one bus watch to be set at a time. This is necessary
because the dispatcher pops the message from the bus and the second
watcher will then get NULL or the next message (and the first won't
get this next message then, etc). If more than one "watcher" is
required signal watches should be used. Fixes bug #526044.
Original commit message from CVS:
* gst/gstxml.c:
Clarify that the save_thyself() and restore_thyself() virtual
functions of GstObject need to be overriden, not
gst_object_(save|restore)_thyself() which is impossible.
Fixes bug #555700.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_get_range), (gst_pad_pull_range):
Revert a patch from 21 months ago that broke caps negotiation in pull
mode. Basically, having a buffer pass over a pad will trigger the
setcaps function when caps change, just like in push mode.
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_remove_func), (update_degree),
(gst_bin_handle_message_func):
The message src can be NULL, don't try to print the object names in that
case.
* libs/gst/base/gstbasesink.c: (gst_base_sink_pad_activate):
Add some more debug info.
* tests/check/pipelines/simple-launch-lines.c: (run_pipeline),
(GST_START_TEST):
Add some debug.
Fix the test, pull based sinks go ASYNC to PAUSED, just like other
scheduling modes.
Original commit message from CVS:
2008-10-08 Andy Wingo <wingo@pobox.com>
* gst/gstghostpad.h (GST_GHOST_PAD_CAST):
* gst/gstghostpad.c (GST_GHOST_PAD_CAST): Fix unintended API
removal: re-add GST_GHOST_PAD_CAST to the header.
Original commit message from CVS:
2008-10-08 Andy Wingo <wingo@pobox.com>
* gst/gstghostpad.h (GstProxyPad, GstProxyPadClass, GstGhostPad)
(GstGhostPadClass): Publically expose these structures so as to
allow easy subclassing from C. Hide the member data behind a
private opaque data pointer.
* gst/gstghostpad.c: Adapt to store instance data in the type
instance's private data region, not in the public struct.
Original commit message from CVS:
* gst/gstregistrybinary.c: (gst_registry_binary_write_cache):
If we can't get a cache file don't try to save something to it.
Dereferencing NULL pointers usually isn't a good idea.
Original commit message from CVS:
2008-10-08 Andy Wingo <wingo@pobox.com>
* gst/gstghostpad.c (gst_ghost_pad_construct): If we got a
template via g_object_get(), be sure to unref it.
* gst/gstbuffer.h (GST_BUFFER_FREE_FUNC): Fix incorrect doc.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstutils.h:
Always use the unaligned variants of GST_READ_UINT* and GST_WRITE_UINT*
as it's too easy to break the ISO C strict aliasing rules with simple
casts to the corresponding type and this would introduce hard to debug
bugs. Fixes bug #545714.
API: Add GST_READ_UINT24_(LE|BE) and GST_WRITE_UINT24_(LE|BE).
Original commit message from CVS:
* gst/gstbuffer.h: (GST_BUFFER_FREE_FUNC):
* gst/gstghostpad.c: (gst_ghost_pad_construct):
Add 'Since' bits to gtk-doc chunks for new API.
Original commit message from CVS:
2008-10-06 Andy Wingo <wingo@pobox.com>
* gst/gstbuffer.h (GST_BUFFER_FREE_FUNC): New API, a free function
that will be called on the malloc_data to free it. Basically a way
to avoid subclassing when all you need is a different free
function, i.e. free() instead of g_free().
* gst/gstbuffer.c (gst_buffer_finalize): Free malloc_data via
calling the free function.
(gst_buffer_init): Initialize the free function to g_free.
Original commit message from CVS:
2008-10-06 Andy Wingo <wingo@pobox.com>
* gst/gstghostpad.h:
* gst/gstghostpad.c (gst_ghost_pad_construct): New function,
finishes the initialization of ghost pad. Useful for language
bindings and subclassers of GstGhostPad. Fixes#539108.
(gst_ghost_pad_new_full): Use the new constructor.
Original commit message from CVS:
Base on Patch by: Olivier Crete <tester at tester dot ca>
* gst/gstbin.c: (gst_bin_init), (gst_bin_add_func),
(gst_bin_remove_func), (update_degree),
(gst_bin_sort_iterator_new), (gst_bin_handle_message_func):
Keep track of pads that are being linked/unlinked and resync the state
changes.
* gst/gstpad.c: (gst_pad_get_direction),
(gst_pad_set_chain_function), (gst_pad_set_getrange_function),
(gst_pad_set_checkgetrange_function), (gst_pad_unlink),
(gst_pad_link_prepare), (gst_pad_link),
(gst_pad_event_default_dispatch), (gst_pad_chain), (gst_pad_push),
(gst_pad_check_pull_range), (gst_pad_get_range),
(gst_pad_pull_range):
Some code cleanups, use macros to check pad direction.
Don't need to take the lock on the pad direction.
Post structure change when pads are linked/unlinked.
Change some checks into _return_if_fail().
* tests/check/gst/gstbin.c:
(test_link_structure_change_state_changed_sync_cb),
(GST_START_TEST), (gst_bin_suite):
Add testcase for pad link/unlinke resync during a state change.
Fixes#510354.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstmessage.c: (gst_message_new_structure_change),
(gst_message_parse_structure_change):
* gst/gstmessage.h:
Implement STRUCTURE_CHANGED messages. These messages will be used to
signal the parent bin of link/unlink operations that could require a
resync when doing a state change. See ##510354.
API: gst_message_new_structure_change()
API: gst_message_parse_structure_change()
Original commit message from CVS:
Patch by: Antoine Tremblay <hexa00 at gmail dot com>
* gst/gstpad.c: (gst_pad_link_check_compatible_unlocked):
Original patch by : Simon Descaries
Fix small refount leak in caps compatibility check.
Fixes#551676.
Original commit message from CVS:
Based on patch by: Antoine Tremblay <hexa00 at gmail dot com>
* gst/gstelement.c: (gst_element_sync_state_with_parent):
Avoid leaking the parent ref when we fail changing the state of the
element using gst_element_sync_state_with_parent(). Fixes#551978.
Original commit message from CVS:
* gst/gstpad.c: (add_unref_pad_to_list),
(gst_pad_get_internal_links_default):
Add fallback when calling the deprecated function on an element that
implements the new internal_link handler.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gsttaglist.c:
* gst/gsttaglist.h:
Add new tags for geo location and clarify purpose of existing location
tag. Fixes#481169
Original commit message from CVS:
Based on patch by: Olivier Crete <tester at tester dot ca>
* docs/gst/gstreamer-sections.txt:
* win32/common/libgstreamer.def:
* gst/gstpad.c: (gst_pad_init),
(gst_pad_set_iterate_internal_links_function),
(int_link_iter_data_free), (iterate_pad),
(gst_pad_iterate_internal_links_default),
(gst_pad_iterate_internal_links), (gst_pad_get_internal_links):
* gst/gstpad.h:
Add threadsafe replacement functions for getting internal links of an
element. Deprecate the old internal links functions.
API:GstPad::gst_pad_set_iterate_internal_links_function()
API:GstPad::GstPadIterIntLinkFunction
API:GstPad::gst_pad_iterate_internal_links()
API:GstPad::gst_pad_iterate_internal_links_default()
* gst/gstghostpad.c: (gst_proxy_pad_do_iterate_internal_links),
(gst_proxy_pad_init):
Implement threadsafe internal links.
* tests/check/elements/tee.c: (GST_START_TEST), (tee_suite):
Unit test for internal links on tee. See #549504.
Original commit message from CVS:
* gst/gstutils.c: (gst_element_get_compatible_pad):
* tests/check/gst/gstghostpad.c: (GST_START_TEST):
* tests/check/gst/gstpad.c: (name_is_valid), (GST_START_TEST):
Fix all leaks due to the bug in gst_pad_template_new() by which it does
not steal the refcount of the given caps as stated.
REVERT THIS COMMIT ONCE FIXED !
REVERT THIS COMMIT ONCE FIXED !
REVERT THIS COMMIT ONCE FIXED !
REVERT THIS COMMIT ONCE FIXED !
REVERT THIS COMMIT ONCE FIXED !
REVERT THIS COMMIT ONCE FIXED !
Original commit message from CVS:
* gst/gstiterator.c:
* gst/gstiterator.h:
After 3 years it's about time to revise the documentation of the
iterator objects.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_get_internal_links_default):
Make the internal links function less thread-unsafe and add some
comments, dunno why.
Original commit message from CVS:
* gst/gst_private.h:
Include gstinfo.h even if GST_DISABLE_GST_DEBUG is defined. Fixes
build with --disable-gst-debug.
Original commit message from CVS:
* gst/gstpadtemplate.c: Revert last change, since it breaks
a few plugins, ffmpeg, alaw, and mulaw. Code is correct,
but shouldn't be enabled until we've released fixed versions
of -good and -ffmpeg.
Original commit message from CVS:
* gst/gstpadtemplate.c:
The old behaviour was that gst_pad_template_new() takes ownership of
the caps. As we now call g_object_new() which calls g_object_set() and
which copies the caps, we have to unref them to not leak them. Fixes
make valgrid for me.
Original commit message from CVS:
* gst/gstobject.c:
Due to popular request also include ObjectType in
gst_object_get_path_string(). Makes gst-launch -v bit more useful.
Original commit message from CVS:
* gst/gstutils.c: Remove check in gst_pad_query_convert() that
src_val must be positive, because that's not a requirement.
This causes problems with converting negative granulepos
values for Dirac.
* gst/gstquery.c: Same, gst_query_new_convert().
Original commit message from CVS:
* gst/gstutils.c: Remove check in gst_pad_query_convert() that
src_val must be positive, because that's not a requirement.
This causes problems with converting negative granulepos
values for Dirac.
Original commit message from CVS:
* gst/gstclock.c: (gst_clock_add_observation):
Add some more debugging to the clock slaving code.
* win32/common/libgstbase.def:
Add new basetransform method.
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_element_set_state):
Take the (recursive) state lock between getting the locked state of an
element and changing the element state. This allows the application to
lock an element's state and then change its state without races.
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_element_set_state):
When an element is in the locked state we still want to update the
base_time of the element.
Original commit message from CVS:
patch by: Murray Cumming <murrayc@murrayc.com>
* gst/gstutils.c:
Mention that this is just like gst_buffer_merge() but with extra
unreffing for C coders. Advise language bindings not to wrap it.
Fixes Bug #533856.
Also fix file comment.
Original commit message from CVS:
* gst/gstregistrybinary.c:
Don't use g_mkstmp() on win32, it's unsafe if glib is using a different
libc.
Fixes#544776.
Original commit message from CVS:
Patch by: Frederic Crozat <fcrozat@mandriva.org>
* gst/gst.c: (init_pre):
Make sure gettext returns translations in UTF-8 encoding rather
than in the current locale encoding (#546822).
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:
Patch by: Olivier Crete <tester at tester dot ca>
* gst/gststructure.c:
(gst_structure_fixate_field_nearest_fraction):
Avoid overflows in fixation code when dealing with MAXINT values, which
v4l2src seems to do.
Fixes#546328.
* tests/check/gst/gststructure.c: (GST_START_TEST):
Make a unit test to check the fix.
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_add_func), (gst_bin_remove_func),
(gst_bin_change_state_func), (bin_handle_async_done),
(gst_bin_handle_message_func):
Fix race for bins that simulate ASYNC state changes by inserting
ASYNC_START and ASYNC_DONE messages in their bus. We need to check for
pending ASYNC messages even when the bin does not have ASYNC children.
We note detect this behaviour because we will receive an ASYNC message
that is originating from the bin itself.
Fixes races with decodebin2 state changes.
* tests/check/gst/gstbin.c: (GST_START_TEST):
Add some more debug.
Original commit message from CVS:
* gst/gsttaglist.c:
Argh. actually save the text before committing. Now adds
gst_tag_merge_strings_with_comma() to gst_tag_register().
Original commit message from CVS:
* gst/gsttaglist.c:
* gst/gsttaglist.h:
Do as tim pointed out and actually register the new tag. Also improve
te docs and use gst_tag_merge_strings_with_comma() method to allow
retriving all keywords merged in one list.
Original commit message from CVS:
* gst/gstpadtemplate.c:
(gst_pad_template_class_init), (gst_static_pad_template_get),
(gst_pad_template_new), (gst_pad_template_pad_created),
(gst_pad_template_set_property), (gst_pad_template_get_property):
Add "name-template", "direction", "presence" and "caps" properties,
so that gst_pad_template_new() is just a thin wrapper around
g_object_new(), which is better for bindings. (Fixes: #539772)
Original commit message from CVS:
* gst/gsturi.c:
Be more liberal in what URIs we accept.
Do not unescape bits of the URI for no apparent reason before passing to
the element. Fixes#545352.
Original commit message from CVS:
Patch by: Robert Schwebel <r.schwebel@pengutronix.de>
* gst/gst.c:
Include gstconfig.h as macros from it are used. Fixes bug #545607.
Original commit message from CVS:
* configure.ac:
* docs/gst/gstreamer-sections.txt:
* docs/gst/gstreamer.types:
* docs/gst/gstreamer.types.in:
* gst/Makefile.am:
* gst/gst.c:
* gst/gstbin.c: (gst_bin_class_init), (gst_bin_set_index_func):
* gst/gstconfig.h.in:
* gst/gstelement.c: (gst_element_get_index):
* gst/gstregistrybinary.c: (gst_registry_binary_save_feature),
(gst_registry_binary_load_feature),
(gst_registry_binary_read_cache):
* gst/gstregistryxml.c: (load_feature),
(gst_registry_xml_read_cache), (gst_registry_xml_save_feature):
* plugins/Makefile.am:
* tools/gst-indent:
* tools/gst-inspect.c: (print_index_info), (print_element_list),
(print_plugin_features), (print_element_features):
* tools/gst-xmlinspect.c: (print_event_masks),
(print_element_info):
* win32/common/gstconfig.h:
Remove GST_DISABLE_(ENUMTYPES|INDEX|URI) everywhere.
Disabling the indexers and URI handler code will only reduce the
required amount of memory by a very small amount but on the other hand
requires much more maintaince work. Apart from that many places of
code are broken when disabling them.
Disabling the enum types doesn't reduce the required amount of memory
by more than a few bytes and makes it hard to fix bugs like #539772,
i.e. use the enums as GObject properties.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_acceptcaps_default),
(gst_pad_configure_src), (gst_pad_alloc_buffer_full):
Remove silly redundant debug.
Add some more debug info.
Clarify the docs regarding new caps received from pad_alloc.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_alloc_buffer_full):
Only sanity-check the buffer size if requested_caps == buffer_caps
(ie. don't take pad caps into account, they're not relevant here)
Original commit message from CVS:
* configure.ac:
Remove AC_ISC_POSIX macro; it's broken on some platforms and not needed.
Add check (taken from -base) for winsock, adds WIN32_LIBS
* gst/Makefile.am:
Add WIN32_LIBS to LIBADD for libgstreamer. Needed now that gstpoll uses
winsock.
Define GST_EXPORTS when building libgstreamer (only used on win32)
* gst/gst_private.h:
* gst/gstinfo.h:
Use GST_EXPORT instead of locally-defined (and incorrect IMPORT_SYMBOL)
for symbols that we need to export in both these files.
* gst/gstpoll.c:
Include gst_private.h higher up to avoid some compile problems on win32.
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/gstplugin.c:
* gst/gstregistry.c:
GstRegistryPool doesn't exist; don't refer to it in docs.
Don't refer to functions that don't exist in docs, it's
unhelpful.
Original commit message from CVS:
* gst/gstchildproxy.c: (gst_child_proxy_base_init):
Add FIXMEs for 0.11 to use GST_TYPE_OBJECT in the signature
of the the child-added / -removed signals as GstChildProxy
only supports GstObjects.
Original commit message from CVS:
* gst/gstplugin.c: (CHECK_PLUGIN_DESC_FIELD), (gst_plugin_load_file):
Print error debug message if plugin description fields that should
be set are NULL.
* gst/gstregistrybinary.c: (gst_registry_binary_save_const_string):
Don't crash if the string to serialise is NULL (it really should
not be, but apparently this used to work with the xml registry ...).
