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hwcontext: add av_hwdevice_ctx_create_derived_opts

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This allows for users who derive devices to set options for the
new device context they derive.
The main use case of this is to allow users to enable extensions
(such as surface drawing extensions) in Vulkan while deriving from
the device their frames are on. That way, users don't need to write
any initialization code themselves, since the Vulkan spec invalidates
mixing instances, physical devices and active devices.
Apart from Vulkan, other hwcontexts ignore the opts argument since they
don't support options at all (or in VAAPI and OpenCL's case, options are
currently only used for device selection, which device_derive overrides).
This commit is contained in:
Lynne
2020-05-20 20:58:03 +01:00
parent 9576e49b40
commit 2e08b39444
10 changed files with 55 additions and 18 deletions
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doc/APIchanges
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@@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
2020-05-23 - xxxxxxxxxx - lavu 56.48.100 - hwcontext.h
Add av_hwdevice_ctx_create_derived_opts.
2020-05-23 - xxxxxxxxxx - lavu 56.47.100 - rational.h
Add av_gcd_q().