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gstreamer/docs/random/porting-to-0.11.txt
Wim Taymans 38b96e6c8c buffer: improve the buffer memory methods 
gst_buffer_take_memory -> gst_buffer_insert_memory because insert is what the
method does.
Make all methods deal with ranges so that we can replace, merge, remove and map
a certain subset of the memory in a buffer. With the new methods we can make
some code nicer and reuse more code. Being able to deal with a subset of the
buffer memory allows us to optimize more cases later (most notably RTP headers
and payload that could be in different memory objects).
Make some more convenient macros that call the more generic range methods.
2012-03-30 18:15:24 +02:00

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The 0.11 porting guide
----------------------
* All deprecated methods were removed. Recompile against 0.10 with
DISABLE_DEPRECATED and fix issues before attempting to port to 0.11.
* GST_BOILERPLATE is gone, use G_DEFINE_TYPE instead.
* various methods take a gsize instead of a guint when talking about memory
sizes.
* multifdsink, tcpclientsink, tcpclientsrc, tcpserversrc the protocol property
is removed, use gdppay and gdpdepay.
* Presets and plugins moved to $XDG_DATA_HOME/gstreamer-0.11/ root
directory. Registry moved to $XDG_CACHE_HOME/gstreamer-0.11/.
XDG_CACHE_HOME usually points to $HOME/.cache and XDG_DATA_HOME
usually is $HOME/.local/share/.
* GstObject:
GST_OBJECT_DISPOSING flag removed
GST_OBJECT_IS_DISPOSING removed
GST_OBJECT_FLOATING flag remove, GstObject is now GInitiallyUnowned
GST_OBJECT_IS_FLOATING removed, use g_object_is_floating()
GST_CLASS_GET_LOCK, GST_CLASS_LOCK, GST_CLASS_TRYLOCK, GST_CLASS_UNLOCK,
used to be a workaround for thread-unsafe glib < 2.8
gst_object_ref_sink() has gpointer as result to make it more like the
GObject version.
gst_object_sink() removed, use gst_object_ref_sink() instead.
gst_class_signal_connect() removed, was only used for XML
parent-set and parent-unset signals removed. Use notify:parent. Currently
still disabled because of deep notify locking issues.
* GstElement:
GstElementDetails is removed and replaced with more generic metadata.
gst_element_class_set_details_simple() -> gst_element_class_set_metadata()
gst_element_class_set_documentation_uri -> gst_element_class_add_metadata
gst_element_class_set_icon_name -> gst_element_class_add_metadata
also gst_element_class_get_metadata()
gst_element_factory_get_longname -> gst_element_factory_get_metadata
gst_element_factory_get_klass -> gst_element_factory_get_metadata
gst_element_factory_get_description -> gst_element_factory_get_metadata
gst_element_factory_get_author -> gst_element_factory_get_metadata
gst_element_factory_get_documentation_uri -> gst_element_factory_get_metadata
gst_element_factory_get_icon_name -> gst_element_factory_get_metadata
gstelementmetadata.h contains the keys for all standard metadata.
gst_element_factory_can_{src,sink}_caps() => gst_element_factory_can_{src,sink}_{any,all}_caps()
Element metadata and pad templates are inherited from parent classes and
should be added in class_init instead of base_init.
gst_element_class_add_pad_template() takes ownership of the template
gst_element_class_add_static_pad_template (element_class, &src_template)
=> gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
Elements that change the duration must post DURATION messages on the
bus when the duration changes in PAUSED or PLAYING.
gst_element_lost_state_full() -> gst_element_lost_state()
gst_element_lost_state() -> gst_element_lost_state(, TRUE)
request_new_pad_full() -> request_new_pad()
gst_element_found_tags() and gst_element_found_tags_for_pad() are gone, just
push the tag event.
* GstPad:
gst_pad_get_caps() was replaced by gst_pad_query_caps(), it
does not return writable caps anymore and an explicit
gst_caps_make_writable() needs to be performed. This was the functionality
of gst_pad_get_caps_reffed(), which is removed now.
A similar change was done for gst_pad_peer_get_caps() and
gst_pad_peer_get_caps_reffed()
gst_pad_set_bufferalloc_function(), gst_pad_alloc_buffer() and
gst_pad_alloc_buffer_and_set_caps() are removed. Use the ALLOCATION query
now when negotiating formats to obtain a reference to a bufferpool object
that can be used to allocate buffers using gst_buffer_pool_acquire_buffer().
removed sched_private, it should not be used, use g_object_set_qdata() or
use element_private.
Removed GST_PAD_CAPS() use gst_pad_get_current_caps() to get a handle to the
currently configured caps.
GstPadGetCapsFunction, gst_pad_get_caps(), gst_pad_peer_get_caps(),
gst_pad_proxy_getcaps() now takes a GstCaps* parameter to inform
the other side about the possible caps and preferences.
gst_pad_get_pad_template_caps() and gst_pad_get_pad_template()
return a new reference of the caps or template now and the return
value needs to be unreffed after usage.
gst_pad_set_caps() now pushes a CAPS event for backward compatibility.
Consider sending the CAPS event yourself. It is not possible anymore to set
NULL caps.
gst_pad_set_checkgetrange_function() and gst_pad_check_pull_range() are
gone, use the SCHEDULING query now.
gst_pad_set_blocked(), gst_pad_set_blocked_async(),
gst_pad_set_blocked_async_full() are removed, use the gst_pad_add_probe()
method with the GST_PAD_PROBE_TYPE_BLOCK to get the same result as the async
blocking version. There is no more sync version of blocking, this is in
general dangerous and can be implemented using the callbacks if needed.
gst_pad_add_data_probe(), gst_pad_add_data_probe_full(),
gst_pad_remove_data_probe(), gst_pad_add_event_probe(),
gst_pad_add_event_probe_full(), gst_pad_remove_event_probe(),
gst_pad_add_buffer_probe(), gst_pad_add_buffer_probe_full(),
gst_pad_remove_buffer_probe() are removed. Use gst_pad_add_probe() and
gst_pad_remove_probe() for equivalent functionality.
The have-data signal was removed from pads, it was never supposed to be used
without calling the _add_.*_probe() methods.
The request-link signal was removed. It was never used.
gst_pad_get_negotiated_caps() -> get_pad_get_current_caps()
GST_FLOW_UNEXPECTED -> GST_FLOW_EOS
GstActivateMode -> GstPadMode, GST_ACTIVATE_* -> GST_PAD_MODE_*
The GstPadAcceptCapsFunction was removed and replaced with a
GST_QUERY_ACCEPT_CAPS query.
The GstPadFixateCapsFunction was removed. It has no replacement, you can
simply do the fixation in the element or use a vmethod from the base class
if appropriate.
The GstPadGetCapsFunction was removed and replaced with a GST_QUERY_CAPS
query.
gst_pad_proxy_getcaps() -> gst_pad_proxy_query_caps()
gst_pad_get_caps() -> gst_pad_query_caps()
gst_pad_peer_get_caps() -> gst_pad_peer_query_caps()
gst_pad_accept_caps() -> gst_pad_query_accept_caps()
gst_pad_peer_accept_caps() -> gst_pad_peer_query_accept_caps()
gst_pad_query_peer_*() -> gst_pad_peer_query_*()
GstPadFlags: GST_PAD_* -> GST_PAD_FLAG_*
* GstPadTemplate
gst_pad_template_get_caps() returns a new reference of the caps
and the return value needs to be unreffed after usage.
gst_pad_template_new() does not take ownership of the caps anymore.
GstPadTemplate is now created with a floating ref and
gst_element_class_add_pad_template() takes ownership of this floating ref.
GstPadTemplate instances are considered immutable and must not be
changed.
* GstMiniObject
A miniobject is now a simple refcounted structure holding the information
common to buffers, events, messages, queries and caps.
There is no more GST_TYPE_MINIOBJECT as the type for subclasses.
G_TYPE_BOXED can be used as the type of all GstMiniObject based types such
as buffers, events, messages, caps, etc. Signals, for example, would use the
boxed type if the argument include GstMiniObject derived types.
gst_mini_object_new() is removed. You would allocate memory with the the
methods specific for the derived type.
GstParamSpecMiniObject is removed, use boxed param spec now with the GType
of the specific GstMiniObject derived type. Also
gst_param_spec_mini_object().
gst_param_spec_mini_object() -> g_param_spec_boxed()
The specific gst_value_*_mini_object() methods are removed, used the generic
boxed methods instead.
gst_value_set_mini_object() -> g_value_set_boxed()
gst_value_take_mini_object() -> g_value_take_boxed()
gst_value_take_get_object() -> g_value_get_boxed()
gst_value_take_dup_object() -> g_value_dup_boxed()
GST_VALUE_HOLDS_MINI_OBJECT() was removed, use G_VALUE_HOLDS_BOXED() or
type-specific GST_VALUE_HOLDS_{BUFFER,CAPS,etc.}() instead.
The GST_MINI_OBJECT_READONLY flag was removed as it used to mark the
memory in buffers as READONLY. Marking memory READONLY can now be done
with the GstMemory API. Writability of miniobjects is now only done by using
the refcount.
* GstBuffer
A GstBuffer is now a simple boxed type this means that subclassing is not
possible anymore.
To add data to the buffer you would now use gst_buffer_insert_memory() with
a GstMemory object containing the data. Multiple memory blocks can added to
a GstBuffer that can then be retrieved with gst_buffer_peek_memory().
GST_BUFFER_DATA(), GST_BUFFER_MALLOCDATA(), GST_BUFFER_FREE_FUNC() and
GST_BUFFER_SIZE() are gone, along with the fields in GstBuffer. Use the
memory API to get access to the buffer data. GST_BUFFER_SIZE() can be
replaced with gst_buffer_get_size() but if also access to the data is
required, gst_buffer_map() can return both the size and data in one go.
The most common way to access all the data in a buffer is by using
gst_buffer_map() and gst_buffer_unmap(). These calls require you to specify
the access mode required to the data and will automatically merge and return
a writable copy of the data.
The buffer must be writable (gst_buffer_is_writable()) in order to modify
the fields, metadata or buffer memory. gst_buffer_make_writable() will not
automatically make a writable copy of the memory but will instead increase
the refcount of the memory. The _map() and _peek_memory() methods will
automatically create writable copies when needed.
gst_buffer_make_metadata_writable() is gone, you can replace this safely
with gst_buffer_make_writable().
gst_buffer_copy_metadata() is gone, use gst_buffer_copy_into() instead and
mind use GST_BUFFER_COPY_METADATA instead of the former GST_BUFFER_COPY_ALL.
gst_buffer_create_sub() is gone and can be safely replaced with
gst_buffer_copy_region().
Changing the size of the buffer data can be done with gst_buffer_resize(),
which will also update the metadata fields correctly. gst_buffer_set_size()
is #defined to a special case of gst_buffer_resize() with a 0 offset.
gst_buffer_try_new_and_alloc() is replaced with gst_buffer_new_and_alloc(),
which now returns NULL when memory allocation fails.
GST_BUFFER_CAPS() is gone, caps are not set on buffers anymore but are set
on the pads where the buffer is pushed on. Likewise GST_BUFFER_COPY_CAPS is
not needed anymore. gst_buffer_get/set_caps() are gone too.
GST_BUFFER_TIMESTAMP is gone, use GST_BUFFER_PTS or GST_BUFFER_DTS instead.
Likewise GST_BUFFER_TIMESTAMP_IS_VALID() was changed to
GST_BUFFER_PTS_IS_VALID and GST_BUFFER_DTS_IS_VALID
gst_buffer_join() was renamed to gst_buffer_append() and the memory is not
directly merged but appended.
gst_buffer_merge() was removed, it is the same as gst_buffer_join() but
without taking ownership of the arguments. Caller code should ref themselves
when needed. Note that the extra refs might force slower paths in
gst_buffer_join().
gst_buffer_is_span() and gst_buffer_span() are removed, use
gst_buffer_merge() and gst_buffer_resize() for the same effect. Merging and
spanning is delayed until the buffer is mapped and in some cases no merging
of memory is needed at all when the element can deal with individual memory
chunks.
* GstBufferList
The GstBufferList object is much simplified because most of the
functionality in the groups is now part of the GstMemory in buffers.
The object is reduced to encapsulating an array of buffers that you can send
with the regular gst_pad_push_list. The iterator is not needed anymore
because you can simply use gst_buffer_list_length() and gst_buffer_list_get()
to iterate the array.
For dealing with the groups, it's now needed to add the memory blocks to
GstBuffer and use the normal buffer API to get and merge the groups.
gst_buffer_list_sized_new() -> gst_buffer_list_new_sized()
gst_buffer_list_len() -> gst_buffer_list_length()
* GstStructure
The GArray of the structure fields are moved to private part and are not
accessible from the application anymore. Use the methods to retrieve and
modify fields from the array.
gst_structure_empty_new() -> gst_structure_new_empty()
gst_structure_id_empty_new() -> gst_structure_new_id_empty()
gst_structure_id_new() -> gst_structure_new_id()
* GstEvent
Boxed types derived from GstMiniObject.
GST_EVENT_SRC is removed. Don't use this anymore.
gst_event_new_qos_full() -> gst_event_new_qos()
gst_event_parse_qos_full() -> gst_event_parse_qos()
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
GST_EVENT_NEWSEGMENT -> GST_EVENT_SEGMENT
gst_event_new_new_segment () -> gst_event_new_segment() and it takes a
GstSegment structure as an argument.
gst_event_parse_new_segment() -> gst_event_parse_segment() to retrieve the
GstSegment structure from the event.
gst_event_copy_segment() to fill a GstSegment structure.
* GstQuery
Boxed types derived from GstMiniObject.
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
gst_query_new_application() -> gst_query_new_custom()
gst_query_parse_formats_length() -> gst_query_parse_n_formats()
gst_query_parse_formats_nth() -> gst_query_parse_nth_format()
Some query utility functions no longer use an inout parameter for the
destination/query format:
- gst_pad_query_position()
- gst_pad_query_duration()
- gst_pad_query_convert()
- gst_pad_query_peer_position()
- gst_pad_query_peer_duration()
- gst_pad_query_peer_convert()
- gst_element_query_position()
- gst_element_query_duration()
- gst_element_query_convert()
gst_element_get_query_types() and gst_pad_get_query_types() with associated
functions were removed.
* GstBufferList
Is now a boxed type derived from GstMiniObject.
* GstMessage
Is now a boxed type derived from GstMiniObject
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
* GstCaps
Is now a boxed type derived from GstMiniObject.
GST_VIDEO_CAPS_xxx -> GST_VIDEO_CAPS_MAKE(xxx)
Some caps functions now take ownership of the input argument, for
efficiency reasons (to avoid unnecessary copies to make them writable):
gst_caps_normalize (caps) => caps = gst_caps_normalize (caps)
gst_caps_do_simplify (caps) => caps = gst_caps_simplify (caps)
gst_caps_merge (caps,caps2) => caps = gst_caps_merge (caps,caps2)
gst_caps_merge_structure (caps,st) => caps = gst_caps_merge_structure (caps,st)
gst_caps_truncate (caps) => caps = gst_caps_truncate (caps)
The compiler should warn about unused return values from these functions,
which may help find the places that need to be updated.
Removed functions:
gst_caps_union() -> gst_caps_merge(): Be careful because _merge takes
ownership of the arguments.
* GstSegment
abs_rate was removed from the public fields, it can be trivially calculated
from the rate field.
accum was renamed to base. last_stop was renamed to position.
The segment info now contains all the information needed to convert buffer
timestamps to running_time and stream_time. There is no more segment
accumulation, the GstSegment is completely self contained.
gst_segment_set_duration() and gst_segment_set_last_stop() are removed,
simply modify the structure members duration and position respectively.
gst_segment_set_newsegment() is removed, it was used to accumulate segments
and is not needed anymore, use gst_segment_copy_into() or modify the segment
values directly.
gst_segment_set_seek() -> gst_segment_do_seek(). Updates the segment values
with seek parameters.
* GstPluginFeature
GST_PLUGIN_FEATURE_NAME() was removed, use GST_OBJECT_NAME() instead.
* GstTypeFind
gst_type_find_peek() returns a const guint8 * now.
* GstTask
gst_task_create() -> gst_task_new()
* GstAdapter
gst_adapter_peek() is removed, use gst_adapter_map() and gst_adapter_unmap()
to get access to raw data from the adapter.
Arguments changed from guint to gsize.
gst_adapter_prev_timestamp() is removed and should be replaced with
gst_adapter_prev_pts() and gst_adapter_prev_dts().
* GstBitReader, GstByteReader, GstByteWriter
gst_*_reader_new_from_buffer(), gst_*_reader_init_from_buffer() removed, get
access to the buffer data with _map() and then use the _new() functions.
gst_byte_reader_new_from_buffer() and gst_byte_reader_init_from_buffer()
removed, get access to the buffer data and then use the _new() functions.
* GstCollectPads
gst_collect_pads_read() removed, use _read_buffer() or _take_buffer() and
then use the memory API to get to the memory.
* GstBaseSrc, GstBaseTransform, GstBaseSink
GstBaseSrc::get_caps(), GstBaseTransform::transform_caps() and
GstBaseSink::get_caps() now take a filter GstCaps* parameter to
filter the caps and allow better negotiation decisions.
* GstBaseTransform
GstBaseTransform::transform_caps() now gets the complete caps passed
instead of getting it passed structure by structure.
GstBaseTransform::event() was renamed to sink_event(). The old function
uses the return value to determine if the event should be forwarded or not.
The new function has a default implementation that always forwards the event
and the return value is simply returned as a result from the event handler.
The semantics of the sink_event are thus the same as those for the src_event
function.
* GstImplementsInterface
has been removed. Interfaces need to be updated to either have
is_ready/usable/available() methods, or have GError arguments
to their methods so we can return an appropriate error if a
particular interface isn't supported for a particular device.
* GstIterator
uses a GValue based API now that is similar to the 0.10 API but
allows bindings to properly use GstIterator and prevents complex
return value ownership issues.
* GstURIHandler
gst_uri_handler_get_uri() and the get_uri vfunc now return a copy of
the URI string
gst_uri_handler_set_uri() and the set_uri vfunc now take an additional
GError argument so the handler can notify the caller why it didn't
accept a particular URI.
gst_uri_handler_set_uri() now checks if the protocol of the URI passed
is one of the protocols advertised by the uri handler, so set_uri vfunc
implementations no longer need to check that as well.
* GstTagList
is now an opaque object instead of being typedefed to a GstStructure. Cast
to GstStructure or use gst_structure_* API on it at your own peril (it may
still work for now, but might be changed in future).
gst_tag_list_new() has been renamed to gst_tag_list_new_empty().
gst_tag_list_new_full*() have been renamed to gst_tag_list_new*().
* GstController:
has now been merged into GstObject. It does not exists as a individual
object anymore. In addition core contains a GstControlSource base class and
the GstControlBinding. The actual control sources are in the controller
library as before. The 2nd big change is that control sources generate
a sequence of gdouble values and those are mapped to the property type and
value range by GstControlBindings.
For plugins the effect is that gst_controller_init() is gone and
gst_object_sync_values() is taking a GstObject * instead of GObject *.
For applications the effect is larger. The whole gst_controller_* API is
gone and now available in simplified form under gst_object_*. ControlSources
are now attached via GstControlBinding to properties. There are no GValue
arguments used anymore when programming control sources.
gst_controller_new* -> gst_object_set_control_source
gst_controller_add_properties -> gst_object_set_control_source
gst_controller_set_control_source -> gst_object_set_control_source
gst_controller_get_control_source -> gst_object_get_control_source
gst_controller_set_property_disabled -> gst_object_set_controlled_property_disabled
gst_object_get_value_arrays has been removed. Loop over the controlled
properties fetch the value array. Also GstValueArray is gone. The fields of
GstValueArray are now passed directly to gst_object_get_value_array as
arguments.
GstInterpolationControlSource has been split. There is a new
GstTimedValueControlSource baseclass and 2 sub classes:
GstInterpolationControlSource and GstTriggerControlSource. The API for setting
and getting the timestamps is in GstTimedValueControlSource.
gst_interpolation_control_source_set_interpolation_mode() has been removed.
Set the "mode" gobject property on the control-source instead. The possible
enum values have been renamed from GST_INTERPOLATE_XXX to
GST_INTERPOLATION_MODE_XXX.
* GstRegistry
gst_registry_get_default() -> gst_registry_get()
gst_default_registry_*(...) -> gst_registry_*(gst_registry_get(), ...)
* GstValue
GST_TYPE_DATE -> G_TYPE_DATE
GST_VALUE_HOLDS_DATE(value) -> G_VALUE_HOLDS(value,G_TYPE_DATE)
gst_value_set_date() -> g_value_set_boxed()
gst_value_get_date() -> g_value_get_boxed()
* GError/GstGError
GstGError -> GError
GST_TYPE_G_ERROR / gst_g_error_get_type() -> G_TYPE_ERROR
* "codec-data" and "streamheader" field in GstCaps
codec-data and stream headers are no longer in GstCaps, but sent as
part of a STREAM CONFIG event (which should be sent after the initial
CAPS event if needed).
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