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[media] DocBook: add SDR specific info to G_MODULATOR / S_MODULATOR
Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation. Signed-off-by: Antti Palosaari <crope@iki.fi> [hans.verkuil@cisco.com: add quotes in "The term 'modulator'"] Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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@ -78,6 +78,12 @@ different audio modulation if the request cannot be satisfied. However
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this is a write-only ioctl, it does not return the actual audio
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modulation selected.</para>
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<para><link linkend="sdr">SDR</link> specific modulator types are
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<constant>V4L2_TUNER_SDR</constant> and <constant>V4L2_TUNER_RF</constant>.
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For SDR devices <structfield>txsubchans</structfield> field must be
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initialized to zero.
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The term 'modulator' means SDR transmitter in this context.</para>
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<para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
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is available.</para>
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