On Sun April 21 2013 21:00:30 Mauro Carvalho Chehab wrote: > Adds the basic API bits for Software Digital Radio (SDR) at > the V4L2 API. > > A normal radio device is actually radio and hardware demod. As the demod > is in hardware, several things that are required for the demodulate the > signal (IF, bandwidth, sample rate, RF/IF filters, etc) are internal to > the device and aren't part of the API. > > SDR radio, on the other hand, requires that every control needed by the > tuner to be exposed on userspace, as userspace needs to adjust the > software decoder to match it. > > As proposed at: > http://comments.gmane.org/gmane.linux.drivers.video-input-infrastructure/63123 > > Add a new device node for SDR devices, and a VIDIOC_QUERYCAP > capability (V4L2_CAP_SDR) to indicate that a devnode is SDR. > > The stream output format also needs to be different, as it should > output sample data, instead of video streams. As we need to document > SDR, add one initial format there that will be later be used. > > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> > --- > Documentation/DocBook/media/v4l/common.xml | 35 ++++++++++++++++++ > Documentation/DocBook/media/v4l/pixfmt.xml | 41 ++++++++++++++++++++++ > Documentation/DocBook/media/v4l/v4l2.xml | 1 + > .../DocBook/media/v4l/vidioc-querycap.xml | 7 ++++ > drivers/media/v4l2-core/v4l2-dev.c | 3 ++ > include/media/v4l2-dev.h | 3 +- > include/uapi/linux/videodev2.h | 11 ++++++ > 7 files changed, 100 insertions(+), 1 deletion(-) > > diff --git a/Documentation/DocBook/media/v4l/common.xml b/Documentation/DocBook/media/v4l/common.xml > index 1ddf354..f59c67d 100644 > --- a/Documentation/DocBook/media/v4l/common.xml > +++ b/Documentation/DocBook/media/v4l/common.xml > @@ -513,6 +513,41 @@ the &v4l2-capability; returned by the &VIDIOC-QUERYCAP; ioctl when the > device has one or more modulators.</para> > </section> > > + <section id="sdr_tuner"> > + <title>Software Digital Radio (SDR) Tuners and Modulators</title> > + > + <para>Those devices are special types of Radio devices that don't s/don't/do not/ 'don't' is a bit too informal IMHO. > +have any analog demodulator. Instead, it samples the radio IF or baseband > +and sends the samples for userspace to demodulate.</para> s/for/to/ > + <section> Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
