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141 lines
4 KiB
Text
141 lines
4 KiB
Text
Plan for 0.11
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=============
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First attempt at making a list of tasks in roughly chronological order.
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* General cleanup
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- Remove deprecated methods
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- Cleanup structs + PADDING
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- ..
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This should allow us to continue expanding later in the same way that 0.10 was
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expanded.
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* Review GstCaps fields
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- go over caps fields for audio, video, compressed media-type etc
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We need to express things with less fields. This would speed up caps, make
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them less verbose and speed up some elements.
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* Add GstFlowReturn for events (and query)
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This would allow us to know more precisely what went wrong.
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http://cgit.freedesktop.org/~wtay/gstreamer/log/?h=events2
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* add return structure for events and query
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Make events return more information. (a seek event might want to return the
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final position of the keyframe seek and the accuracy of the seek)
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Make bindings easiers. Currently the writability of a query depends on the
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refcount being exactly 1. If the query is not writable, it simply cannot be
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answered.
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* Make GstMiniObject a simple boxed type
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- Move copy and free function to structure
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- convert GstBuffer, GstEvent, GstMessage, GstQuery,
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We don't need to subclass miniobjects when we have arbitrary metadata.
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Allocation should be more efficient and buffer/metadata/data can be allocated
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and pooled in one contiguous memory area.
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Typechecking of various types is much more efficient when there is only
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one class.
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http://cgit.freedesktop.org/~wtay/gstreamer/log/?h=miniobject2
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* Convert GstCaps to GstMiniObject
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Currently it has its own refcounting and flags.
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http://cgit.freedesktop.org/~wtay/gstreamer/log/?h=miniobject2
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* GVariant registry
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- allow for mmaped registy (tpm)
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* Incremental caps
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- Remove array from caps ?
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- make caps iterator or is the array the cache for iterator ?
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We need to perform less caps operations when negotiating formats. One way is
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to only handle small caps objects incrementally.
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http://cgit.freedesktop.org/~ensonic/gstreamer/log/?h=lazycaps
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* Make GstBufferMetadata
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- Make functions to register metadata
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- Make common metadata: timeinfo, memory data, video data
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- Remove GstBuffer Fields
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- Make methods to add metadata to buffers.
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More flexible metadata for buffers.
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http://cgit.freedesktop.org/~wtay/gstreamer/log/?h=buffermeta
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* Negotiation of metadata
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- figure out if we need to negotiate the metadata on the caps or if we can
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gracefully degrade when an element doesn't understand the metadata.
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We need to avoid that elements put metadata on buffers that is essential in
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handling the buffer contents but that is then not understood by other
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elements.
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* Rework reverse negotiation
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- upstream event to notify of a downstream caps change
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- _alloc_buffer() takes input GstBuffer prototype (or NULL)
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- _alloc_buffer() never returns changed caps.
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One of the performance problems in 0.10 is that transform elements need to
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call gst_pad_alloc_buffer() downstream to check if the caps changed. This
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usually also results in a useless memory allocation.
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We would make a new upstream event to notify downstream elements that new caps
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are possible somewhere downstream.
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gst_pad_alloc_buffer() would take a GstBuffer as an input argument to make the
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API easier, we can then use metadata to specify additional constraints for the
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new buffer (such as strides, etc)
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* Incremental event progation
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- certain events would be sticky on a pad like for caps
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- rules for pushing an event downstream
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- right before pushing a buffer
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- after link operation
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- activate for most serialized downstream events
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This would allow an application to have more control over the state of the
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dataflow in a pipeline.
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* GstSegment changes
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- remove segment accumulation
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- add accumulated time to the event
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- apply segment info to pads
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- add method on pads to get/adjust sync offset
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- add method on pads to query current running_time
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The goal is to make the timing model more comprehensible and thus make dynamic
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pipeline plugging easier.
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