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This is used to pass the possible caps and preferences to the pad and to allow better negotiation decisions.
233 lines
9.4 KiB
Plaintext
233 lines
9.4 KiB
Plaintext
The 0.11 porting guide
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----------------------
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* All deprecated methods were removed. Recompile against 0.10 with
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DISABLE_DEPRECATED and fix issues before attempting to port to 0.11.
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* GST_BOILERPLATE is gone, use G_DEFINE_TYPE instead.
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* various methods take a gsize instead of a guint when talking about memory
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sizes.
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* multifdsink, tcpclientsink, tcpclientsrc, tcpserversrc the protocol property
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is removed, use gdppay and gdpdepay.
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* Presets and plugins moved to $XDG_DATA_HOME/gstreamer-0.11/ root
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directory. Registry moved to $XDG_CACHE_HOME/gstreamer-0.11/.
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XDG_CACHE_HOME usually points to $HOME/.cache and XDG_DATA_HOME
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usually is $HOME/.local/share/.
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* GstObject:
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GST_OBJECT_DISPOSING flag removed
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GST_OBJECT_IS_DISPOSING removed
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GST_OBJECT_FLOATING flag remove, GstObject is now GInitiallyUnowned
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GST_OBJECT_IS_FLOATING removed, use g_object_is_floating()
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GST_CLASS_GET_LOCK, GST_CLASS_LOCK, GST_CLASS_TRYLOCK, GST_CLASS_UNLOCK,
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used to be a workaround for thread-unsafe glib < 2.8
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gst_object_ref_sink() has gpointer as result to make it more like the
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GObject version.
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gst_object_sink() removed, use gst_object_ref_sink() instead.
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gst_class_signal_connect() removed, was only used for XML
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parent-set and parent-unset signals removed. Use notify:parent. Currently
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still disabled because of deep notify locking issues.
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* GstElement:
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GstElementDetails is removed and replaced with more generic metadata.
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gst_element_class_set_details_simple() -> gst_element_class_set_metadata()
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gst_element_class_set_documentation_uri -> gst_element_class_add_metadata
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gst_element_class_set_icon_name -> gst_element_class_add_metadata
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gst_element_factory_get_longname -> gst_element_factory_get_metadata
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gst_element_factory_get_klass -> gst_element_factory_get_metadata
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gst_element_factory_get_description -> gst_element_factory_get_metadata
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gst_element_factory_get_author -> gst_element_factory_get_metadata
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gst_element_factory_get_documentation_uri -> gst_element_factory_get_metadata
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gst_element_factory_get_icon_name -> gst_element_factory_get_metadata
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gstelementmetadata.h contains the keys for all standard metadata.
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Element metadata and pad templates are inherited from parent classes and
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should be added in class_init instead of base_init.
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gst_element_class_add_pad_template() takes ownership of the template
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Elements that change the duration must post DURATION messages on the
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bus when the duration changes in PAUSED or PLAYING.
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gst_element_lost_state_full() -> gst_element_lost_state()
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gst_element_lost_state() -> gst_element_lost_state(, TRUE)
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request_new_pad_full() -> request_new_pad()
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* GstPad:
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gst_pad_get_caps() does not return writable caps anymore and an explicit
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gst_caps_make_writable() needs to be performed. This was the functionality
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of gst_pad_get_caps_reffed(), which is removed now.
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A similar change was done for gst_pad_peer_get_caps() and
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gst_pad_peer_get_caps_reffed()
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gst_pad_set_bufferalloc_function(), gst_pad_alloc_buffer() and
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gst_pad_alloc_buffer_and_set_caps() are removed. Use the ALLOCATION query
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now to obtain a reference to a bufferpool object that can be used to
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allocate buffers.
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removed sched_private, it should not be used, use g_object_set_qdata() or
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use element_private.
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Removed GST_PAD_CAPS() use gst_pad_get_current_caps() to get a handle to the
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currently configured caps.
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GstPadGetCapsFunction, gst_pad_get_caps(), gst_pad_peer_get_caps(),
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gst_pad_proxy_getcaps() now takes a GstCaps* parameter to inform
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the other side about the possible caps and preferences.
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* GstMiniObject
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A miniobject is now a simple refcounted structure holding the information
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common to buffers, events, messages, queries and caps.
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There is no more GST_TYPE_MINIOBJECT as the type for subclasses.
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G_TYPE_BOXED can be used as the type of all GstMiniObject based types such
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as buffers, events, messages, caps, etc. Signals, for example, would use the
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boxed type if the argument include GstMiniObject derived types.
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gst_mini_object_new() is removed. You would allocate memory with the the
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methods specific for the derived type.
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GstParamSpecMiniObject is removed, use boxed param spec now with the GType
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of the specific GstMiniObject derived type. Also
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gst_param_spec_mini_object().
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gst_param_spec_mini_object() -> g_param_spec_boxed()
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The specific gst_value_*_mini_object() methods are removed, used the generic
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boxed methods instead.
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gst_value_set_mini_object() -> g_value_set_boxed()
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gst_value_take_mini_object() -> g_value_take_boxed()
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gst_value_take_get_object() -> g_value_get_boxed()
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gst_value_take_dup_object() -> g_value_dup_boxed()
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The GST_MINI_OBJECT_READONLY flag was removed as it used to mark the
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memory in buffers as READONLY. Marking memory READONLY can now be done
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with the GstMemory API. Writability of miniobjects is now only done by using
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the refcount.
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* GstBuffer
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A GstBuffer is now a simple boxed type this means that subclassing is not
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possible anymore.
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To add data to the buffer you would now use gst_buffer_take_memory() with
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a GstMemory object containing the data. Multiple memory blocks can added to
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a GstBuffer that can then be retrieved with gst_buffer_peek_memory().
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GST_BUFFER_DATA(), GST_BUFFER_MALLOCDATA(), GST_BUFFER_FREE_FUNC() and
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GST_BUFFER_SIZE() are gone, along with the fields in GstBuffer. Use the
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memory API to get access to the buffer data. GST_BUFFER_SIZE() can be
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replaced with gst_buffer_get_size() but if also access to the data is
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required, gst_buffer_map() can return both the size and data in one go.
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The most common way to access all the data in a buffer is by using
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gst_buffer_map() and gst_buffer_unmap(). These calls require you to specify
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the access mode required to the data and will automatically merge and return
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a writable copy of the data.
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The buffer must be writable (gst_buffer_is_writable()) in order to modify
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the fields, metadata or buffer memory. gst_buffer_make_writable() will not
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automatically make a writable copy of the memory but will instead increase
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the refcount of the memory. The _map() and _peek_memory() methods will
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automatically create writable copies when needed.
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gst_buffer_make_metadata_writable() is gone, you can replace this safely
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with gst_buffer_make_writable().
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gst_buffer_create_sub() is gone and can be safely replaced with
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gst_buffer_copy_region().
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Changing the size of the buffer data can be done with gst_buffer_resize(),
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which will also update the metadata fields correctly. gst_buffer_set_size()
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is #defined to a special case of gst_buffer_resize() with a 0 offset.
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gst_buffer_try_new_and_alloc() is replaced with gst_buffer_new_and_alloc(),
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which now returns NULL when memory allocation fails.
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GST_BUFFER_CAPS() is gone, caps are not set on buffers anymore but are set
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on the pads where the buffer is pushed on. Likewise GST_BUFFER_COPY_CAPS is
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not needed anymore. gst_buffer_get/set_caps() are gone too.
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* GstBufferList
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The GstBufferList object is much simplified because most of the
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functionality in the groups is now part of the GstMemory in buffers.
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The object is reduced to encapsulating an array of buffers that you can send
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with the regular gst_pad_push_list. The iterator is not needed anymore
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because you can simply use gst_buffer_list_len() and gst_buffer_list_get()
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to iterate the array.
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For dealing with the groups, it's now needed to add the memory blocks to
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GstBuffer and use the normal buffer API to get and merge the groups.
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* GstEvent
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GST_EVENT_SRC is removed. Don't use this anymore.
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gst_event_new_new_segment_full() -> gst_event_new_new_segment()
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gst_event_parse_new_segment_full() -> gst_event_parse_new_segment()
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gst_event_new_qos_full() -> gst_event_new_qos()
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gst_event_parse_qos_full() -> gst_event_parse_qos()
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The GstStructure is removed from the public API, use the getters to get
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a handle to a GstStructure.
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* GstQuery
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Boxed types derived from GstMiniObject.
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The GstStructure is removed from the public API, use the getters to get
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a handle to a GstStructure.
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* GstBufferList
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Is now a boxed type derived from GstMiniObject.
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* GstMessage
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Is now a boxed type derived from GstMiniObject
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The GstStructure is removed from the public API, use the getters to get
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a handle to a GstStructure.
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* GstCaps
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Is now a boxed type derived from GstMiniObject.
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* GstSegment
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abs_rate was removed from the public fields, it can be trivially calculated
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from the rate field.
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* GstTypeFind
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gst_type_find_peek() returns a const guin8 * now.
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* GstAdapter
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gst_adapter_peek() is removed, use gst_adapter_map() and gst_adapter_unmap()
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to get access to raw data from the adapter.
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Arguments renamed from guint to gsize.
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* GstBitReader, GstByteReader, GstByteWriter
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gst_*_reader_new_from_buffer(), gst_*_reader_init_from_buffer() removed, get
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access to the buffer data with _map() and then use the _new() functions.
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gst_byte_reader_new_from_buffer() and gst_byte_reader_init_from_buffer()
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removed, get access to the buffer data and then use the _new() functions.
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* GstCollectPads
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gst_collect_pads_read() removed, use _read_buffer() or _take_buffer() and
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then use the memory API to get to the memory.
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