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[media] V4L2 Spec: improve the G/S_INPUT/OUTPUT documentation

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As Rupert pointed out, the phrase "It is good practice" should be replaced
with "You must".

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Rupert Eibauer <Rupert.Eibauer@ces.ch>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-01-11 07:37:54 -03:00 committed by Mauro Carvalho Chehab
parent 6055b12ae0
commit dacd4fa37d
2 changed files with 5 additions and 4 deletions
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4
Documentation/DocBook/media/v4l/vidioc-g-input.xml
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@ -61,8 +61,8 @@ desired input in an integer and call the
<constant>VIDIOC_S_INPUT</constant> ioctl with a pointer to this
integer. Side effects are possible. For example inputs may support
different video standards, so the driver may implicitly switch the
current standard. It is good practice to select an input before
querying or negotiating any other parameters.</para>
current standard. Because of these possible side effects applications
must select an input before querying or negotiating any other parameters.</para>
<para>Information about video inputs is available using the
&VIDIOC-ENUMINPUT; ioctl.</para>

5
Documentation/DocBook/media/v4l/vidioc-g-output.xml
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@ -61,8 +61,9 @@ desired output in an integer and call the
<constant>VIDIOC_S_OUTPUT</constant> ioctl with a pointer to this integer.
Side effects are possible. For example outputs may support different
video standards, so the driver may implicitly switch the current
standard. It is good practice to select an output before querying or
negotiating any other parameters.</para>
standard.
standard. Because of these possible side effects applications
must select an output before querying or negotiating any other parameters.</para>
<para>Information about video outputs is available using the
&VIDIOC-ENUMOUTPUT; ioctl.</para>