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[media] V4L2 Spec: clarify usage of V4L2_FBUF_FLAG_PRIMARY

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As per discussion during the 2011 V4L-DVB workshop.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Hans Verkuil 2011-11-07 08:30:20 -03:00 committed by Mauro Carvalho Chehab
parent 146d35b00d
commit 0fb6ec6b1c
1 changed files with 6 additions and 4 deletions
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Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml
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@ -295,7 +295,8 @@ set this field to zero.</entry>
<entry>The device is capable of non-destructive overlays. <entry>The device is capable of non-destructive overlays.
When the driver clears this flag, only destructive overlays are When the driver clears this flag, only destructive overlays are
supported. There are no drivers yet which support both destructive and supported. There are no drivers yet which support both destructive and
non-destructive overlays.</entry> non-destructive overlays. Video Output Overlays are in practice always
non-destructive.</entry>
</row> </row>
<row> <row>
<entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry> <entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry>
@ -356,7 +357,9 @@ with the chroma-key colors are replaced by video pixels, which is exactly opposi
<entry><constant>V4L2_FBUF_FLAG_PRIMARY</constant></entry> <entry><constant>V4L2_FBUF_FLAG_PRIMARY</constant></entry>
<entry>0x0001</entry> <entry>0x0001</entry>
<entry>The framebuffer is the primary graphics surface. <entry>The framebuffer is the primary graphics surface.
In other words, the overlay is destructive. [?]</entry> In other words, the overlay is destructive. This flag is typically set by any
driver that doesn't have the <constant>V4L2_FBUF_CAP_EXTERNOVERLAY</constant>
capability and it is cleared otherwise.</entry>
</row> </row>
<row> <row>
<entry><constant>V4L2_FBUF_FLAG_OVERLAY</constant></entry> <entry><constant>V4L2_FBUF_FLAG_OVERLAY</constant></entry>
@ -366,9 +369,8 @@ size as the capture. [?]</entry>
</row> </row>
<row> <row>
<entry spanname="hspan">The purpose of <entry spanname="hspan">The purpose of
<constant>V4L2_FBUF_FLAG_PRIMARY</constant> and
<constant>V4L2_FBUF_FLAG_OVERLAY</constant> was never quite clear. <constant>V4L2_FBUF_FLAG_OVERLAY</constant> was never quite clear.
Most drivers seem to ignore these flags. For compatibility with the Most drivers seem to ignore this flag. For compatibility with the
<wordasword>bttv</wordasword> driver applications should set the <wordasword>bttv</wordasword> driver applications should set the
<constant>V4L2_FBUF_FLAG_OVERLAY</constant> flag.</entry> <constant>V4L2_FBUF_FLAG_OVERLAY</constant> flag.</entry>
</row> </row>