Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstclock.c: (gst_clock_adjust_unlocked),
(gst_clock_unadjust_unlocked), (gst_clock_set_calibration):
* gst/gstclock.h:
Improve _adjust_unlocked() so that it overflows less.
Add gst_clock_unadjust_unlocked to convert from external time to
internal time based on calibration.
Add some more debug.
API: GstClock::gst_clock_unadjust_unlocked()
Original commit message from CVS:
Patch by: Tommi Myöhänen <ext-tommi dot myohanen at nokia dot com>
* plugins/elements/gstmultiqueue.c: (gst_multi_queue_release_pad):
Deactivate pads and free GstSingleQueue with gst_single_queue_free()
when releasing sink pad. Fixes#425400.
Original commit message from CVS:
* docs/random/ensonic/dynlink.txt:
More work on proposal for new core api.
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasetransform.h:
API: GST_BASE_TRANSFORM_LOCK/UNLOCK added
* libs/gst/controller/gstcontroller.c:
(on_object_controlled_property_changed),
(gst_controller_sync_values),
(gst_controller_set_interpolation_mode):
* libs/gst/controller/gstcontroller.h:
Less verbose logging add docs for unimplemented parts and correctly
return when using unavailable parts.
Original commit message from CVS:
* gst/gstclock.c: (gst_clock_set_master), (do_linear_regression):
Move all the debug to the CLOCK category, and associate it with
the clock object.
Original commit message from CVS:
* libs/gst/base/gstadapter.c: (gst_adapter_take_buffer):
Make take_buffer a bit quicker by removing redundant checks
caused by calling gst_adapter_take.
Original commit message from CVS:
* plugins/elements/gstmultiqueue.c: (gst_single_queue_free):
Don't leak GCond.
* tests/check/Makefile.am:
* tests/check/elements/.cvsignore:
* tests/check/elements/multiqueue.c: (setup_multiqueue),
(GST_START_TEST), (multiqueue_suite):
Add some dead simple unit tests for the 'multiqueue' element
(some bits don't work yet and are disabled for now).
Original commit message from CVS:
* gst/gstelement.c: (gst_element_get_request_pad),
(gst_element_class_get_request_pad_template):
Make gst_element_get_request_pad() create request pads only for
request pad templates and not for, say, sometimes pad templates.
Original commit message from CVS:
* docs/design/draft-klass.txt:
Add example that needs more thinking.
* docs/design/draft-missing-plugins.txt:
More thoughts about wtrapper plugins.
* docs/random/ensonic/embedded.txt:
* docs/random/ensonic/profiling.txt:
More design work.
Original commit message from CVS:
* libs/gst/base/gstbasesrc.c: (gst_base_src_get_range),
(gst_base_src_loop):
Only push the segment events in the PLAYING state for live sources.
Original commit message from CVS:
* gst/gstpipeline.c: (gst_pipeline_change_state):
Modify the clock distribution path in PAUSED->PLAYING so that we
never attempt to choose a new clock unless we're actually leaving
the PAUSED state for the first time. This prevents choosing a
different clock when the state_change gets called for a 2nd time due
to some element doing an async state change.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_set_caps), (gst_pad_configure_sink),
(gst_pad_configure_src), (gst_pad_alloc_buffer_full),
(gst_pad_chain_unchecked), (gst_pad_push):
Revert last commit. This needs some more thoughts.
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_set_caps), (gst_pad_alloc_buffer_full),
(gst_pad_chain_unchecked), (gst_pad_push):
Check in set_caps if the caps are compatible with the pad and remove
two functions that are redundant now. Fixes#421543.
Original commit message from CVS:
* tests/check/gst/gstsystemclock.c: (GST_START_TEST),
(mixed_thread), (mixed_async_cb), (gst_systemclock_suite):
Unref some more to make valgrind happy.
Original commit message from CVS:
* gst/gstsystemclock.c: (gst_system_clock_id_wait_jitter_unlocked),
(gst_system_clock_id_wait_jitter),
(gst_system_clock_id_wait_async), (gst_system_clock_id_unschedule):
Fix anoying regression that survived a few releases. When adding an
async entry while blocking on a sync entry, the sync entry will unblock
but still be busy, so it should continue to wait instead of returning
_BUSY to the app.
Add some comments here and there.
* tests/check/gst/gstsystemclock.c: (mixed_thread),
(mixed_async_cb), (GST_START_TEST), (gst_systemclock_suite):
Add testcase for this.
Original commit message from CVS:
* libs/gst/base/gstbasesrc.c: (gst_base_src_get_range):
Handle errors from the clock sync better, only UNSCHEDULED indicates a
WRONG_STATE and can silently pause the task. All other cases should
error out.
Original commit message from CVS:
Patch by: <syrjala at sci dot fi>
* gst/gstpad.c: (gst_pad_alloc_buffer_full), (gst_pad_send_event):
Fix possible deadlock if pad eventfunc is not specified. Fixes#421177.
Improve debugging.
Original commit message from CVS:
* gst/gstbin.c: (gst_bin_get_type), (gst_bin_element_set_state):
Prepare for release where we warn against possible app breakage in the
case of live pipelines along with an env var to enable/disable live
preroll mode (GST_COMPAT=[no-]live-preroll).
Original commit message from CVS:
* plugins/elements/gstidentity.c (gst_identity_check_imperfect_offset):
So we should use correct constants for checking for None offset.
Original commit message from CVS:
Patch by: Olivier Crete <tester at tester dot ca>
* gst/gstelement.c: (gst_element_sync_state_with_parent):
Look at the pending state too when syncing the element state to the
parent. Fixes#420133.
Original commit message from CVS:
* libs/gst/base/gstbasesink.c: (gst_base_sink_set_flushing),
(gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
* libs/gst/base/gstbasesrc.c: (gst_base_src_perform_seek),
(gst_base_src_default_event), (gst_base_src_unlock_stop),
(gst_base_src_deactivate):
* libs/gst/base/gstbasesrc.h:
Add ::unlock_stop to basesrc and basesink. This allows an opportunity
for sub-classes to correctly clear any state they set trying to
unlock, such as clearing out unlock commands from a command fd.
* plugins/elements/gstfdsink.c: (gst_fd_sink_class_init),
(gst_fd_sink_render), (gst_fd_sink_unlock),
(gst_fd_sink_unlock_stop):
* plugins/elements/gstfdsrc.c: (gst_fd_src_class_init),
(gst_fd_src_init), (gst_fd_src_unlock), (gst_fd_src_unlock_stop),
(gst_fd_src_create), (gst_fd_src_get_size), (gst_fd_src_do_seek):
Implement unlock_stop in fdsrc and fdsink.
Implement seeking in fdsrc when a seekable fd is passed, as in
gst-launch-0.10 fdsrc ! ... ! xvimagesink < /path/to/file
Original commit message from CVS:
Patch by: Evan Nemerson <evan at coeus dash group dot com>
* gst/gstelement.c: (gst_element_class_init):
Fix pad-added and pad-removed signal signatures so that the pad type is
stated as GST_TYPE_PAD instead of G_TYPE_OBJECT. Fixes#419851.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
Add new element field and method.
* gst/gstbin.c: (gst_bin_class_init), (gst_bin_init),
(bin_remove_messages), (gst_bin_add_func), (gst_bin_remove_func),
(gst_bin_recalc_state), (gst_bin_get_state_func),
(gst_bin_element_set_state), (gst_bin_change_state_func),
(gst_bin_continue_func), (bin_bus_handler),
(bin_push_state_continue), (bin_handle_async_start),
(bin_handle_async_done), (gst_bin_handle_message_func):
Make async state changes a bit smarter by using new ASYNC_START and
ASYNC_DONE messages. This reduces the number of times we run the state
recalculation thread.
Don't change state of element with a pending ASYNC_START message.
Deprecate STATE_DIRTY messages.
* gst/gstelement.c: (gst_element_init), (gst_element_send_event),
(gst_element_get_state_func), (gst_element_continue_state),
(gst_element_lost_state), (gst_element_set_state_func),
(gst_element_change_state):
* gst/gstelement.h:
Keep the state that was last set by the app in a new element field.
Don't allow state changes when handling an element event.
Post ASYNC_START and ASYNC_DONE messages.
Change lost_state so that we go to PAUSED and wait for the parent to set
us to PLAYING again (so latency calculation can be performed)
Export gst_element_change_state() method so that subclasses can use it.
API: gst_element_change_state()
API: GST_STATE_TARGET
* gst/gstpipeline.c: (gst_pipeline_class_init),
(reset_stream_time), (gst_pipeline_change_state),
(gst_pipeline_handle_message), (gst_pipeline_set_new_stream_time):
Using the new ASYNC_START message we can reset the base_time when
needed. This can then be used to implement base_time redistribution in
flushing seeks so that we can remove the explicit seek handling.
Perform latency query and configuration when going to PLAYING.
* libs/gst/base/gstbasesink.c: (gst_base_sink_commit_state),
(gst_base_sink_query), (gst_base_sink_change_state):
Post new ASYNC_START/ASYNC_DONE messages.
* tests/check/generic/sinks.c: (GST_START_TEST):
Fix test because the bin will not set the async element to PLAYING right
away.
* tests/check/gst/gstbin.c: (pop_async_done), (GST_START_TEST):
Make the message check a little stronger.
Handle ASYNC messages.
* tests/check/pipelines/cleanup.c: (GST_START_TEST):
* tests/check/pipelines/simple-launch-lines.c: (GST_START_TEST):
Expect ASYNC_DONE messages.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstmessage.c: (gst_message_new_async_start),
(gst_message_new_async_done), (gst_message_parse_info),
(gst_message_parse_async_start):
* gst/gstmessage.h:
Add ASYNC_START and ASYNC_DONE messages to prepare for latency
support.
Original commit message from CVS:
* tools/gst-inspect.c:
(print_plugin_automatic_install_info_codecs):
Now that we don't check for the 'Codec' keyword any longer in the
klass, we shouldn't spew a warning if the klass isn't a decoder or
encoder (since it might be a Source/Network, for example).
Original commit message from CVS:
* tools/gst-inspect.c:
(print_plugin_automatic_install_info_codecs):
Don't require decoder/demuxer/depayloader elements or
encoder/muxer/paylader elements to have 'Codec' as part of their
factory class string when introspecting a plugin's capabilities.
draft-klass.txt mentions that it might be removed in future, and
flump3dec doesn't have it as part of its class string, so chances
are others might also not have it.
Original commit message from CVS:
* gst/gstchildproxy.c: (gst_child_proxy_get_property),
(gst_child_proxy_set_property):
Invert precondition check to be alike the ones in the mimiced gobject
api.
Original commit message from CVS:
* docs/design/draft-tagreading.txt:
* docs/random/ensonic/audiobaseclasses.txt:
Do some Architect work.
* gst/gstobject.c: (gst_object_set_name):
Add a WARNING.
* gst/gstpad.c:
Add docs that point from gst_pad_get_range to gst_pad_pull_range
Original commit message from CVS:
* gst/gstsystemclock.c: (gst_system_clock_init),
(gst_system_clock_start_async), (gst_system_clock_id_wait_async):
Defer starting the async system clock thread until the first async
wait is scheduled. Fixes#414986.
Original commit message from CVS:
* plugins/elements/gstmultiqueue.c: (gst_multi_queue_finalize),
(gst_single_queue_free):
Fix small leak (free GstSingleQueue structure too, not only contents).
Original commit message from CVS:
* gst/gstbin.c:(gst_bin_add):
Use GST_STR_NULL to prevent NULL pointer to be passed to GST_CAT_DEBUG.
* win32/common/libgstbase.def:
* win32/common/libgstreamer.def:
Add new exported functions.
Original commit message from CVS:
* plugins/elements/gstidentity.c: (gst_identity_class_init),
(gst_identity_init), (gst_identity_check_perfect),
(gst_identity_check_imperfect_timestamp),
(gst_identity_check_imperfect_offset), (gst_identity_transform_ip),
(gst_identity_set_property), (gst_identity_get_property):
* plugins/elements/gstidentity.h:
Separate out check-imperfect-timestamp and check-imperfect-offset.
Put back check-perfect as it was to keep compatibility.
Original commit message from CVS:
* gst/gstelement.c: (gst_element_dispose):
There's no need to warn if VOID_PENDING is not NONE here, as
long as the state is NULL it's ok, and that's checked immediately
above.
Original commit message from CVS:
2007-03-08 Zaheer Abbas Merali <zaheerabbas at merali dot org>
* plugins/elements/gstidentity.c: (gst_identity_check_perfect):
Fix check for perfect stream to ignore buffers with -1
offsets/offset ends when checking data contiguity.
Original commit message from CVS:
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_sink_eventfunc),
(gst_base_transform_handle_buffer), (gst_base_transform_chain),
(gst_base_transform_activate):
* libs/gst/base/gstbasetransform.h:
Add support for dropping buffers with custom GstFlowReturn.
Set DISCONT flags on outgoing buffers based on QoS, incomming DISCONT
buffers or dropped buffers.
* docs/libs/gstreamer-libs-sections.txt:
docs for new custom return code.
* plugins/elements/gstidentity.c: (gst_identity_transform_ip):
Use drop support in base class to implement drop-probability.
Original commit message from CVS:
2007-03-07 Zaheer Abbas Merali <zaheerabbas at merali dot org>
* plugins/elements/gstidentity.c: (gst_identity_check_perfect):
Only post bus message at max, once per buffer received.
Original commit message from CVS:
2007-03-07 Zaheer Abbas Merali <zaheerabbas at merali dot org>
* plugins/elements/gstidentity.c: (gst_identity_check_perfect):
Rename non-perfect to imperfect for Mike and for the sanctity of
the language.
Also make sure bus message gets emitted for data-incontiguities.
Original commit message from CVS:
2007-03-07 Zaheer Abbas Merali <zaheerabbas at merali dot org>
* plugins/elements/gstidentity.c: (gst_identity_check_perfect),
(gst_identity_start):
* plugins/elements/gstidentity.h:
Emit bus message if check-perfect is true and we encounter a
non-perfect stream between 2 consecutive buffers.
Fixes#415394.
Original commit message from CVS:
* gst/gstvalue.c: (gst_value_transform_object_string),
(_gst_value_initialize):
Implement GstObject -> string transform so we print object names
when serializing GValues containing GstObjects.
Original commit message from CVS:
* gst/gstelement.c: (gst_element_message_full),
(gst_element_set_locked_state), (gst_element_get_state_func),
(gst_element_change_state):
Handle INFO messages from the GST_ELEMENT_INFO macro as well.
Documentation updates.
Small code cleanups.
* gst/gstmessage.c: (gst_message_new_info),
(gst_message_parse_info):
* gst/gstmessage.h:
API: gst_message_new_info()
API: gst_message_parse_info()
Add INFO message create and parse code.
Original commit message from CVS:
* gst/gstbin.c: (bin_query_min_max_init), (bin_query_latency_fold),
(bin_query_latency_done):
Also report the live parameter of a latency query.
Original commit message from CVS:
* tests/check/generic/states.c: (GST_START_TEST), (states_suite):
Copy the current generic/states example from -base and adapt so
we can use the exact same code everywhere.
Check a STATES_IGNORE_ELEMENTS env var which can be used
to ignore certain element factories for this test, which is
what is being done in -base
* tests/check/Makefile.am:
Mention this environment variable.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstbus.c: (gst_bus_init), (gst_bus_dispose), (gst_bus_post),
(gst_bus_timed_pop), (gst_bus_pop):
* gst/gstbus.h:
API: gst_bus_timed_pop()
Implement gst_bus_timed_pop() to do a blocking timed wait for a
message to arrive on the bus.
* tests/check/gst/gstbus.c: (GST_START_TEST), (pop_thread),
(gst_bus_suite):
Two unit tests for new _timed_pop() function.
Original commit message from CVS:
* gst/gstpipeline.c: (gst_pipeline_change_state),
(gst_pipeline_provide_clock_func), (gst_pipeline_set_delay):
Don't ref a NULL clock in _provide_clock_func().
Don't allow an INVALID delay.
Don't try to calculate base_time with an invalid start_time.
Also distribute and notify a NULL clock when it was selected.
* tools/gst-launch.c: (event_loop):
Don't crash when a NULL clock was selected in the pipeline.
Original commit message from CVS:
* docs/design/Makefile.am:
* docs/design/draft-missing-plugins.txt:
* docs/random/draft-missing-plugins.txt:
Some small updates: update plugin system identifier prefix
('gstreamer.net' to 'gstreamer'), mention our new install
API in libgstbaseutils rather than libgimme-codec, add
reference to the online docs.
Original commit message from CVS:
* win32/common/config.h:
Pretty sure Bill never made a powerpc version. Powerpc hackers,
use moap cl ci to only check in what is mentioned in the ChangeLog.
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstelement.h:
Fix up documentation to link to the correct GstGError section.
Add GST_ELEMENT_INFO macro since someone else added a Info message.
Original commit message from CVS:
* tools/gst-launch.c: (event_loop):
Make sure that we actually show the important message part of a
warning message.
No need to check if the gerror is not NULL to free; first of all
g_free accepts NULL; and second the default error handler would
segfault if gerror was NULL.
Original commit message from CVS:
* docs/design/part-gstghostpad.txt:
* gst/gstghostpad.c: (gst_ghost_pad_dispose),
(gst_ghost_pad_new_full):
Make the ghostpad a parent of the internal pad again for better backward
compatibility. Don't write code that relies on this however.
* gst/gstpad.c: (gst_pad_activate_pull), (gst_pad_activate_push),
(gst_pad_link_check_hierarchy):
Require that parents should be GstElements in the hierarchy check.
Original commit message from CVS:
* docs/design/part-gstghostpad.txt:
* gst/gstghostpad.c: (gst_ghost_pad_class_init),
(gst_ghost_pad_internal_do_activate_push),
(gst_ghost_pad_internal_do_activate_pull),
(gst_ghost_pad_do_activate_push), (gst_ghost_pad_do_activate_pull),
(gst_ghost_pad_do_link), (gst_ghost_pad_dispose),
(gst_ghost_pad_new_full), (gst_ghost_pad_set_target):
Do not set the internal pad as a parent anymore so we can avoid
hierarchy linking errors when the ghostpad has no parent yet. This also
fixes failed activation because of unlinked internal pads, which in
turn fixes the impossible case where you have to activate a pad before
you can add it to a running element.
Also fix the docs.
* gst/gstpad.c: (pre_activate), (post_activate),
(gst_pad_set_active), (gst_pad_activate_pull),
(gst_pad_activate_push), (gst_pad_check_pull_range):
Add some more debug info.
Mark activation mode in pre_activate so that we don't try to activate in
endless loops. Fixes#385084.
Original commit message from CVS:
* libs/gst/base/gstbasetransform.c: (gst_base_transform_init),
(gst_base_transform_check_get_range):
Implement a checkgetrange function instead of relying on the default
core behaviour that assumes we can operate in pull mode if we have a
getrange function. First step at fixing #385084.
Original commit message from CVS:
* gst/gstchildproxy.h:
* libs/gst/base/gstbasesink.h:
* libs/gst/base/gstbasesrc.h:
* libs/gst/base/gstbasetransform.h:
More docs coverage and some ChangeLog surgery (add missing names)
Original commit message from CVS:
* gst/gstpad.c: (gst_pad_get_internal_links_default),
(gst_pad_dispatcher):
Improve debugging of default pad dispatcher and query functions.
Original commit message from CVS:
* docs/design/part-seeking.txt:
Some small update.
* gst/gstsegment.c: (gst_segment_set_seek):
Revert old bogus change that should make seeking work again.
Original commit message from CVS:
* docs/random/ensonic/dynlink.txt:
* docs/random/ensonic/interfaces.txt:
* docs/random/ensonic/receipies.txt:
Possible dynamic reconnection api, plus some type fixes the other two
docs.
Original commit message from CVS:
* plugins/elements/gstfilesink.c: (gst_file_sink_uri_set_uri):
* plugins/elements/gstfilesrc.c: (gst_file_src_uri_set_uri):
Also check for an absolute path following file:// in the filesrc
element. Remove redundant check and call g_path_is_absolute() on the
unescaped location.
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:
* docs/design/draft-latency.txt:
Small update.
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_get_latency), (gst_base_sink_query_latency),
(gst_base_sink_wait_clock), (gst_base_sink_send_qos),
(gst_base_sink_perform_qos), (gst_base_sink_queue_object_unlocked),
(gst_base_sink_chain_unlocked), (gst_base_sink_send_event),
(gst_base_sink_get_position), (gst_base_sink_query),
(gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
API: gst_base_sink_query_latency() to let subclasses query the upstream
latency.
API: gst_base_sink_get_latency() to let subclasses query the configured
latency in the sink.
Implement query and set latency.
Update some docs.
As spotted by Will Newton <will dot newton at gmail dot com>: Make sure we
don't continue preroll when we are flushing. Fixes#405284.
* tests/check/pipelines/stress.c: (change_state_timeout),
(quit_timeout), (GST_START_TEST), (stress_suite):
Test for #405284.
Original commit message from CVS:
* gst/gstbin.h:(gst_bin_get_by_interface),
(gst_bin_iterate_all_by_interface):
Replace interface parameter name by iface as interface is
a reserved keyword in Visual Studio for C++ projects so it removes
a build error for application developpers using VS.
* plugins/elements/gstfilesrc.c:(gst_file_src_uri_set_uri):
Fix a bug on Windows in uri format check. Now the prefix checked
is file:// and next we check if the path after file:// is absolute.
* win32/common/libgstbase.def:
* win32/common/libgstdataprotocol.def:
* win32/common/libgstgstreamer.def:
Add new exported functions.
Original commit message from CVS:
2007-02-09 Andy Wingo <wingo@pobox.com>
* tests/check/pipelines/simple-launch-lines.c
(simple_launch_lines_suite, test_tee): Disable tee test until I
have time to fix it :-(
Original commit message from CVS:
2007-02-09 Andy Wingo <wingo@pobox.com>
* tests/check/Makefile.am (noinst_HEADERS):
* tests/check/libs/libsabi.c:
* tests/check/libs/struct_ppc32.h: Add ABI checks for PPC32.
* tests/check/gst/gstabi.c:
* tests/check/gst/struct_ppc32.h: Add ABI checks for PPC32.
Original commit message from CVS:
2007-02-09 Andy Wingo <wingo@pobox.com>
* tests/check/pipelines/simple-launch-lines.c (test_tee): Add
tests for push and pull tee behavior.
* plugins/elements/gsttee.h:
* plugins/elements/gsttee.c: Describe has-sink-loop better, and
mark as deprecated as well as unimplemented. It was a crack idea.
Add support for tee operating in pull mode, off by default.
Original commit message from CVS:
2007-02-09 Andy Wingo <wingo@pobox.com>
* gst/gstregistryxml.c (load_feature, load_plugin): Drop some
normal-case logs down to LOG, raise errors to WARNING.
(gst_registry_xml_read_cache): Don't log before calling a function
that logs.
* gst/gstregistry.c (gst_registry_finalize): Less debug on program
exit (registry finalize).
(gst_registry_add_plugin, gst_registry_add_feature): No need for a
DEBUG log when we emit signals that people don't even have the
chance to connect to.
(gst_registry_scan_path_level): Less logging in the normal case.
Original commit message from CVS:
Patch by: Michal Benes <michal dot benes at itonis dot tv>
* plugins/elements/gstfilesrc.c: (gst_file_src_create_read):
Correctly generate EOS for non-seekable files. We don't have a total
length for them and would get an unexpected end of file if we only
special-cased for regular files. (Fixes: #404569)
Original commit message from CVS:
* tests/check/elements/filesrc.c: (GST_START_TEST),
(filesrc_suite):
Add unit test for the GstURIHandler interface in filesrc. This also
tests the newly added file://localhost/foo/bar support.
Original commit message from CVS:
* gst/gstelementfactory.h:
The klass string is not a hierarchy. Add reference to the design doc
for more information and common types.
