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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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9e86ac4a22
codecalpha is a new plugin introduced to support VP8/VP9 alpha as defined in the WebM and Matroska specifications. It splits the stream into two streams, one for the alpha and one for the actual content, then it decodes them separately with vpxdec and finally combine the results as A420 or AV12 (i.e. YUV + an extra alpha plane). The workflow above is setup by means of a bin, gstcodecalphabin. This patch simulates the same workflow into the v4l2codecs namespace, thus using the new v4l2 stateless decoders for hardware acceleration. This is so we can register the new alpha decode elements only if the hardware produces formats we support, i.e. I420 or NV12 for now. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2272>
49 lines
1.5 KiB
Meson
49 lines
1.5 KiB
Meson
v4l2codecs_sources = [
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'plugin.c',
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'gstv4l2codecallocator.c',
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'gstv4l2codecdevice.c',
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'gstv4l2codech264dec.c',
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'gstv4l2codecpool.c',
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'gstv4l2codecvp8dec.c',
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'gstv4l2decoder.c',
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'gstv4l2format.c',
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'gstv4l2codecalphadecodebin.c',
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]
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libgudev_dep = dependency('gudev-1.0', required: get_option('v4l2codecs'))
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if get_option('v4l2codecs').disabled()
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have_v4l2 = false
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message('V4L2 CODECs plugin is disabled')
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else
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# Should only be built on Linux, check for Linux kernel headers even though
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# we have our own copy.
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have_v4l2 = cc.has_header('linux/videodev2.h')
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if get_option('v4l2codecs').enabled() and not have_v4l2
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error('V4L2i CODECs is requested but kernel headers were not found')
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endif
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# Find makedev in various header files. Different operating systems put the
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# macro in different header files.
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foreach name: ['mkdev', 'sysmacros', 'types']
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have_makedev = cc.has_header_symbol('sys/@0@.h'.format(name), 'makedev')
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cdata.set10('HAVE_MAKEDEV_IN_' + name.to_upper(), have_makedev)
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endforeach
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endif
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if have_v4l2 and libgudev_dep.found()
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gstv4l2codecs = library('gstv4l2codecs',
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v4l2codecs_sources,
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c_args : gst_plugins_bad_args,
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cpp_args: gst_plugins_bad_args,
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include_directories : [configinc],
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dependencies : [gstbase_dep, gstcodecs_dep, gstallocators_dep, libgudev_dep,
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gstpbutils_dep,],
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install : true,
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install_dir : plugins_install_dir,
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)
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pkgconfig.generate(gstv4l2codecs, install_dir : plugins_pkgconfig_install_dir)
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plugins += [gstv4l2codecs]
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endif
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