Update framestep document, we want to pass the flush flag in the step-done
message.
Add flush flag to the gstmessage.
Update examples to use the new step-done message api.
Implement framestep with playback rates < 0.0 too.
Add new STEP event and methods for creating/parsing the event
Update design docs.
Add new STEP_DONE message and method to create/parse.
API: GstEvent::gst_event_new_step()
API: GstEvent::gst_event_parse_step()
API: GstMessage::gst_message_new_step_done()
API: GstMessage::gst_message_parse_step_done()
Add a start_time field and some methods. The start_time will contain the
running_time of when the element last went to paused. This time can be user to
report the position in PAUSED but also to do more correct clipping and
stepping later.
Add a gst_element_lost_state_full() with an extra argument to control
distribution of a new base_time. We will need this for flushing step
operations.
API: GstElement::gst_element_lost_state_full()
Reuse buffer code for bufferlists. Not sure if this measurably impacts performance
for the simple buffer case, if it does after doing some benchmarks, we can
decouple it later.
Fixes#572285
Remove the static function set on the TaskPool before _prepare() is called and
allow for assigning a function to a Task when we _push().
Update the examples
Pass the thread object in a GValue, which would allow the application to figure
out the type of the object instead of us having to explicitly code it in a
message field.
Add the first version of the STREAM_STATUS message design docs.
This message will be used to give applications more control over the
streaming threads.
Two new log levels to dump FIXMEs into the log and to log data
in form of a hex dump (#578114).
API: GST_CAT_FIXME_OBJECT
API: GST_CAT_MEMDUMP_OBJECT
API: GST_CAT_FIXME
API: GST_CAT_MEMDUMP
API: GST_FIXME_OBJECT
API: GST_MEMDUMP_OBJECT
API: GST_FIXME
API: GST_MEMDUMP
Yes, 'codec' isn't exactly the best word, but let's be consistent with AUDIO_CODEC
and VIDEO_CODEC (which may be 'raw' formats as well after all). Prerequisite for
bug #576552.
Add some of the bits needed for an uninstalled gst-rtsp-server (so gdb works
on the examples etc.). Python bits are still missing, and we might need an
-uninstalled.pc file as well in the future. Break up very long lines to make
them easier to read and maintain. Also remove gst-plugins paths from the
old days.
This will be mostly useful in all elements that have some kind of internal
seek/index table. Currently almost all of them (or even all of them)
are using a linear search although the used array is already sorted,
wasting some CPU time without good reason.
Fixes bug #573623.
We got the constants for G_LITTLE_ENDIAN and G_BIG_ENDIAN the wrong way around in some docs (fixes: #572392). Also mention
G_BYTE_ORDER in the audio types section.
Add a GST_MESSAGE_REQUEST_STATE that can be posted by element when they would
like to have the application change the state of the pipeline. the primary use
case is to pause the pipeline when an audio mixer is mixing a higher priority
stream but it can also be used for other purposes.
Add some docs and a unit test.
Implement the REQUEST_STATE message in gst-launch.
API: gst_message_new_request_state()
API: gst_message_parse_request_state()
API: GST_MESSAGE_REQUEST_STATE
Replace all mentions of CVS with git. Add link to gst-uninstalled script in cgit and to SubmittingPatches page in wiki. Fix some typos. Update indenting rules to what we actually use (#571646).
This tag will list a homepage for the media,
i.e. the artist's or movie's homepage.
This is different to GST_TAG_LOCATION as the latter
lists the original location of the media.
Fixes bug #571227.
Add a property to select the clock type, currently REALTIME and MONOTONIC when
posix timers are available.
Implement the systemclock with GstPoll instead of GCond. This allows us to
schedule timeouts with nanosecond precission on newer kernels and with ppoll
support. It's also resilient to changes to the systemclock because of NTP or
similar.
Add a special timer mode in GstPoll that makes it only use the control socket
with a timeout to schedule timeouts. Also add a pair of methods to wakeup the
timeout thread.
API: GstPoll::gst_poll_new_timer()
API: GstPoll::gst_poll_write_control()
API: GstPoll::gst_poll_read_control()
We don't want to use -Wall -Werror and friends when building the gtk-doc-generated
$docmodule-scan.c, since we can't easily fix stuff if a certain gtk-doc/compiler
combination breaks the build. Fixes build on ubuntu intrepid.
Original commit message from CVS:
* docs/faq/gst-uninstalled:
Add libgstapp-0.10 from -base to search path and remove the old
lib from -bad from the search path.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstquark.c:
* gst/gstquark.h:
* gst/gstquery.c: (gst_query_new_uri), (gst_query_set_uri),
(gst_query_parse_uri):
* gst/gstquery.h:
API: Add URI query type. This is useful to query the URI
of a sink/source element and can be used by demuxers that
need to get data from other files.
This query should go upstream by default.
Fixes bug #562949.
* plugins/elements/gstfdsink.c: (gst_fd_sink_query):
* plugins/elements/gstfdsrc.c: (gst_fd_src_class_init),
(gst_fd_src_query):
* plugins/elements/gstfilesink.c: (gst_file_sink_query):
* plugins/elements/gstfilesrc.c: (gst_file_src_class_init),
(gst_file_src_query):
Implement URI query.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gsttagsetter.c:
* gst/gsttagsetter.h:
Rename api added in previous commit and add since tag to docs.
API: gst_tag_setter_reset_tags()
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gsttagsetter.c:
* gst/gsttagsetter.h:
Add function to reset tagsetter for element reuse.
API: gst_tag_setter_flush()
Original commit message from CVS:
* docs/design/part-TODO.txt:
Remove the seqnum entry that we implemented in 0.10 already.
Add entry about removing the format return value for queries.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstbin.c: (gst_bin_recalculate_latency),
(gst_bin_change_state_func):
* gst/gstbin.h:
Add method to recalculate and redistribute the latency on a bin.
API: gst_bin_recalculate_latency().
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:
* docs/manual/advanced-position.xml:
* docs/manual/basics-bins.xml:
* docs/manual/basics-bus.xml:
* docs/manual/basics-pads.xml:
* docs/manual/intro-gstreamer.xml:
* docs/manual/intro-preface.xml:
Some Application Development Manual fixes thanks to
Andrew Feren. Fixes#558459.
Original commit message from CVS:
* docs/Makefile.am:
* docs/gst/gstreamer-docs.sgml:
* docs/gst/gstreamer-sections.txt:
* docs/gst/running.xml:
* docs/libs/gstreamer-libs-docs.sgml:
Change to xinclude based build - its faster and easier to maintain.
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:
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbytereader.c: (gst_byte_reader_get_data),
(gst_byte_reader_peek_data):
* libs/gst/base/gstbytereader.h:
* win32/common/libgstbase.def:
API: Add gst_byte_reader_get_data and gst_byte_reader_peek_data
to get a pointer to the data at the current position and have
a guaranteed size.
Original commit message from CVS:
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_do_preroll),
(gst_base_sink_flush_start), (gst_base_sink_flush_stop),
(gst_base_sink_event), (gst_base_sink_perform_seek),
(gst_base_sink_loop), (gst_base_sink_pad_activate_pull),
(gst_base_sink_send_event), (gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
Add method to commit the state in subclasses.
Refactor the flush_start and flush_stop code because we need it for
flushing while seeking too.
Implement the beginnings of seeking in pull mode.
Use the segment last_stop field for the pulling offset.
Fix the pause method in pull mode.
Configure the segment to BYTES for pull mode.
API: GstBaseSink::gst_base_sink_do_preroll()
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:
* docs/design/part-negotiation.txt:
Update the docs some more.
* libs/gst/base/gsttypefindhelper.c: (helper_find_peek):
If we pull a buffer with non-trivial caps, suggest those caps with the
max probability.
Original commit message from CVS:
* docs/design/part-negotiation.txt:
Small doc update.
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_pad_getcaps), (gst_base_sink_pad_setcaps),
(gst_base_sink_init), (gst_base_sink_set_blocksize),
(gst_base_sink_get_blocksize), (gst_base_sink_set_property),
(gst_base_sink_get_property), (gst_base_sink_needs_preroll),
(gst_base_sink_loop), (gst_base_sink_pad_activate),
(gst_base_sink_negotiate_pull), (gst_base_sink_pad_activate_pull),
(gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
Add blocksize property and methods to control the amount of data
to pull.
Negotiate first before activating upstream in pull mode so that they can
negotiate themselves.
When we operate in pull mode, we only accept the caps that we
negotiated.
Make the sink go ASYNC to PAUSED, like all other sinks.
API: GstBaseSink::gst_base_sink_set_blocksize()
API: GstBaseSink::gst_base_sink_get_blocksize()
API: GstBaseSink::blocksize
* libs/gst/base/gstbasesrc.c: (gst_base_src_wait_playing),
(gst_base_src_set_live), (gst_base_src_is_live),
(gst_base_src_set_format), (gst_base_src_query_latency),
(gst_base_src_set_blocksize), (gst_base_src_get_blocksize),
(gst_base_src_set_do_timestamp), (gst_base_src_get_do_timestamp),
(gst_base_src_set_property), (gst_base_src_get_property):
* libs/gst/base/gstbasesrc.h:
Add typechecking in public API functions.
Add methods to control the blocksize in subclasses.
API: GstBaseSrc::gst_base_src_set_blocksize()
API: GstBaseSrc::gst_base_src_get_blocksize()
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:
* 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:
* docs/pwg/advanced-request.xml:
Fix 0.8 api usage in example. Fixes#554561
* docs/pwg/appendix-porting.xml:
Change 0.9 to 0.10 here.
Original commit message from CVS:
* docs/manual/basics-data.xml:
Change "event-event interaction" to "element-element interaction".
Fixes#552448. Also fix sample code for seeking and do more 0.8->0.10
updates.
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:
patch by: Luc Pionchon <luc.pionchon@nokia.com>
* docs/manual/advanced-clocks.xml:
* docs/manual/clocks.png:
* docs/manual/diagrams-clocks.svg:
Add one more image showing different times together with a describing
paragraph. Fixes#547729.
Original commit message from CVS:
* docs/manual/advanced-interfaces.xml:
Turn thoughts about HAL into a note-tag. Remove mentioning that is
only used to discover devices.
Original commit message from CVS:
* configure.ac:
* docs/gst/gstreamer.types:
Revert 'accidential' change of the configure option removal. We still
need to generate the types file in configure --disable-load-save.
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:
* docs/manual/advanced-autoplugging.xml: Add fakesink to example
code to close the pipeline graph. This prevents the program from
printing internal data flow errors.
Original commit message from CVS:
Patch by: tmatth <le dot businessman at gmail dot com>
* docs/pwg/building-testapp.xml:
Don't use an undeclared variable in the example program.
Fixes bug #542573.
Original commit message from CVS:
patch by: Luc Pionchon <luc.pionchon@nokia.com>
* docs/manual/advanced-autoplugging.xml:
* docs/manual/advanced-threads.xml:
* docs/manual/basics-bins.xml:
* docs/manual/basics-elements.xml:
* docs/manual/basics-helloworld.xml:
* docs/manual/basics-pads.xml:
Add scale factor for pdf output.
* docs/manual/intro-basics.xml:
Switched sections "pads" and "bins" and added a pipeline diagram.
* docs/manual/intro-gstreamer.xml:
Added more info on gstreamer.
* docs/manual/intro-motivation.xml:
Commented out the whole section "current problem", which sounds
historical and somehow osolete; it could be turned in a positive
way and reused to improve the design principles.
* docs/manual/intro-preface.xml:
- Update URLs to library.gnome.org.
- Do not mention GTK+ in preliminary reading (irrelevant).
- Mention Plugin Writer's Manual and further reading only in the
previous section.
- Added a list of most relevant GObject/glib topics.
* docs/manual/Makefile.am:
* docs/manual/bin-element-ghost.fig:
* docs/manual/bin-element-ghost.png:
* docs/manual/bin-element-noghost.fig:
* docs/manual/bin-element-noghost.png:
* docs/manual/bin-element.fig:
* docs/manual/bin-element.png:
* docs/manual/filter-element-multi.fig:
* docs/manual/filter-element-multi.png:
* docs/manual/filter-element.fig:
* docs/manual/filter-element.png:
* docs/manual/gstreamer-overview.png:
* docs/manual/hello-world.fig:
* docs/manual/hello-world.png:
* docs/manual/linked-elements.fig:
* docs/manual/linked-elements.png:
* docs/manual/mime-world.fig:
* docs/manual/mime-world.png:
* docs/manual/queue.fig:
* docs/manual/queue.png:
* docs/manual/simple-player.png:
* docs/manual/sink-element.fig:
* docs/manual/sink-element.png:
* docs/manual/src-element.fig:
* docs/manual/src-element.png:
* docs/manual/diagrams-general.svg:
* docs/manual/diagrams-pipelines.svg:
Removed .fig, added .png counterpart.
Fixes: #539137
Original commit message from CVS:
patch by: Luc Pionchon <luc.pionchon@nokia.com>
* docs/manual/manual.xml:
- Reorganised the previous "introduction" bundle into Foreword,
Introduction, and About GStreamer. The two first are <preface>
docbook elements. The later is the first part of the book.
- added intro-gstreamer.xml (content partially from
intro-preface.xml)
- moved appendix-win32.xml into appendix-integration.xml
* docs/manual/intro-preface.xml: gstreamer section moved...
* docs/manual/intro-gstreamer.xml: ...here. new file.
* docs/manual/appendix-win32.xml: removed file. Content moved...
* docs/manual/appendix-integration.xml: ...here.
* docs/manual/highlevel-components.xml: section about GstEditor moved...
* docs/manual/appendix-checklist.xml: ...here.
Original commit message from CVS:
patch by: Luc Pionchon <luc.pionchon@nokia.com>
* docs/manual/basics-helloworld.xml:
* docs/manual/hello-world.fig:
- Explicitely include glib.h.
- Do not use global variables.
- Use g_printerr() instead of g_print().
- Minor formating/renaming to increase readibility.
- Renamed new_pad() to on_pad_added()
- Improved explenatory comments.
- renamed ogg parser to ogg demuxer
- Use "autoaudiosink" instead of "alsasink".
Fixes: #538619
Original commit message from CVS:
* docs/README:
Document that for plgin-docs we extraxt he short-desc from the element
details.
* docs/design/part-states.txt:
Tell that devices should be closed in PAUSED -> READY.
* docs/manual/README:
Document how tests in the manual are handled.
* docs/manuals.mak:
Typo in comment.
Original commit message from CVS:
* docs/design/part-block.txt:
Fix typo.
* docs/design/part-element-transform.txt:
Add notes about why transform needs to know input/output sizes.
Add some issues that need to be solved.
Add some more use cases.
* tests/check/libs/test_transform.c: (gst_test_trans_base_init),
(gst_test_trans_class_init), (result_sink_chain),
(result_buffer_alloc), (gst_test_trans_new), (gst_test_trans_free),
(gst_test_trans_push), (gst_test_trans_pop):
* tests/check/libs/transform1.c: (buffer_alloc_pt1),
(set_caps_pt1), (GST_START_TEST), (set_caps_pt2), (transform_ip_1),
(set_caps_1), (set_caps_ct1), (transform_ct1),
(transform_caps_ct1), (transform_size_ct1), (buffer_alloc_ct1),
(gst_basetransform_suite):
Add suport for different pad templates and buffer-alloc.
Add more checks for caps and buffer-alloc.
Add checks for proxy buffer alloc.
Add unit test for copy transform.
Original commit message from CVS:
* docs/libs/gstreamer-libs-sections.txt:
Add new API to doc
* libs/gst/check/gstcheck.c:
* libs/gst/check/gstcheck.h:
API: gst_check_teardown_pad_by_name
Original commit message from CVS:
* docs/design/Makefile.am:
Dist some more design docs.
* docs/random/moving-plugins:
Small addition: good plugins mustn't have functional code
within assertion macros.
Original commit message from CVS:
* docs/design/draft-framestep.txt:
Some ideas about a framestep API
* docs/design/part-element-transform.txt:
Start design and use cases for basetransform in order to get it
fixed soon.
Original commit message from CVS:
Patch by: joel larsson <tilljoel at gmail dot com>
* docs/plugins/gstreamer-plugins.args:
* plugins/elements/gstfdsrc.c: (gst_fd_src_class_init),
(gst_fd_src_init), (gst_fd_src_update_fd),
(gst_fd_src_set_property), (gst_fd_src_get_property),
(gst_fd_src_create):
* plugins/elements/gstfdsrc.h:
Add timeout property like udpsrc. Fixes#538628.
Add some more docs and example pipelines.
Original commit message from CVS:
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_init),
(gst_base_sink_query_latency), (gst_base_sink_set_render_delay),
(gst_base_sink_get_render_delay), (gst_base_sink_wait_eos),
(gst_base_sink_do_sync):
* libs/gst/base/gstbasesink.h:
* win32/common/libgstbase.def:
Add method to allow sinks to specify additional delay between the sync
times and the actual rendering of the data.
API: gst_base_sink_set_render_delay()
API: gst_base_sink_get_render_delay()
Original commit message from CVS:
patch by: Suresh Kumar P <sureshkumar.pp@gmail.com>
* docs/faq/gst-uninstalled:
Also support ffmpeg in gst-uninstalled.
Original commit message from CVS:
* docs/manual/advanced-autoplugging.xml:
* docs/manual/basics-helloworld.xml:
* docs/manual/basics-pads.xml:
* docs/manual/highlevel-components.xml:
Avoid using a bad function in the example code.
Original commit message from CVS:
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_wait_clock):
* libs/gst/base/gstbasesink.h:
Expose a method that was previously used internally to synchronize
against the clock because it can be useful for subclasses too.
GstBaseSink::gst_base_sink_wait_clock()
