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videotoolbox: add hwcontext support

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This adds tons of code for no other benefit than making VideoToolbox
support conform with the new hwaccel API (using hw_device_ctx and
hw_frames_ctx).

Since VideoToolbox decoding does not actually require the user to
allocate frames, the new code does mostly nothing.

One benefit is that ffmpeg_videotoolbox.c can be dropped once generic
hwaccel support for ffmpeg.c is merged from Libav.

Does not consider VDA or VideoToolbox encoding.

Fun fact: the frame transfer functions are copied from vaapi, as the
mapping makes copying generic boilerplate. Mapping itself is not
exported by the VT code, because I don't know how to test.
This commit is contained in:
wm4
2017-05-15 11:27:24 +02:00
parent 2c6179aa82
commit 532b23f079
11 changed files with 493 additions and 13 deletions
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doc/APIchanges
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@@ -15,6 +15,14 @@ libavutil: 2015-08-28
API changes, most recent first:
2017-05-15 - xxxxxxxxxx - lavc 57.96.100 - avcodec.h
VideoToolbox hardware-accelerated decoding now supports the new hwaccel API,
which can create the decoder context and allocate hardware frames automatically.
See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx.
2017-05-15 - xxxxxxxxxx - lavu 57.63.100 - hwcontext.h
Add AV_HWDEVICE_TYPE_VIDEOTOOLBOX and implementation.
2017-xx-xx - xxxxxxx - lavc 57.95.100 / 57.31.0 - avcodec.h
Add AVCodecContext.apply_cropping to control whether cropping
is handled by libavcodec or the caller.