Hi all,

Following is a new version of the patch series for VAAPI encode and support 
infrastructure around that.

Notable updates:

* Everything is now passed around and reference counted with AVFrames/AVBuffers.

* Most of FATE for H.264 and H.265 now passes with VAAPI decoders (see notes on 
failures below).

* The hardware context structure has an allocation function and the locking 
around it is now required to be recursive.

* The configure test should be sensible now.  It introduces a new configure 
macro VAAPI_RECENT (better name welcome), indicating that libva is at least 
recentish (in particular, vaCreateSurfaces needs to take eight arguments).  
Specific codecs are then decided by looking for structures required for their 
operation.

Thanks,

- Mark


Outstanding FATE failures with HWACCEL=vaapi (H.264 and H.265 only, the other 
codecs also have failures which I've ignored so far):

h264-conformance-frext-hpcamolq_brcm_b, h264-conformance-frext-hpcvmolq_brcm_b:
Greyscale (chroma_format_idc == 0): not yet supported.

h264-reinit-large_420_8-to-small_420_8:
This kindof works, but we lose because the old pix_fmt in the AVCodecContext 
gets overwritten with the hwaccel value during the reinitialisation 
(h264_slice.c:1413).  The decoder then produces the requested format and the 
filter parts fall over because they can't deal with that.  Changing 
h264_slice.c:947 to not return the VAAPI pixel format makes it pass.

h264-conformance-cvfc1_sony_c, h264-lossless:
Wrong result.

hevc-conformance-PICSIZE_A_Bossen_1, hevc-conformance-PICSIZE_B_Bossen_1, 
hevc-conformance-PICSIZE_C_Bossen_1, hevc-conformance-PICSIZE_D_Bossen_1, 
hevc-paramchange-yuv420p-yuv420p10:
Unsupported resolution (the hardware I have is bounded at 4096 pixels in either 
dimension).

hevc-conformance-CONFWIN_A_Sony_1, hevc-conformance-SLIST_A_Sony_4, 
hevc-conformance-SLIST_B_Sony_8 hevc-conformance-SLIST_C_Sony_3 
hevc-conformance-SLIST_D_Sony_9:
Wrong result.  (Though SLIST_B and SLIST_D do get the last three frames right.)
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