vaapisink: keep handle_events flag except that if user want to set
When state of vaapisink is changed from PLAYING to NULL, the handle_events
flag is set to FALSE, and never recovered, and then event thread is never
going to run.
So we should allow to set the flag only when users try it.
When downstream negotiates a pixel-aspect-ratio of 0/1, the
calculations for resizing and formatting in vaapipostproc and
vaapisink, respectively, failed, and thus the pipeline.
This patch handles this situation by converting p-a-r of 0/1 to
1/1. This is how other sinks, such as glimagesink, work.
vaapivideobufferpool: fix leak of created allocator
Since it's created by itself, it should be unref-counted
after gst_buffer_pool_config_set_allocator call. Afterwards,
this allocator will be ref-counted again when assigning to priv->allocator.
vaapivideobufferpool: create or reconfig allocator
Sometimes a video decoder could set different buffer pool
configurations, because their frame size changes. In this case we
did not reconfigure the allocator.
This patch enables this use case, creating a new allocator inside
the VAAPI buffer pool if the caps changed, if it is not dmabuf-based.
If so, it is just reconfigured, since it doesn't have a surface pool.
