"Drubin, Daniel" <daniel.drubin@xxxxxxxxx> wrote:
>[...]
>> Does v4l handle multiple video streams to userspace at different
>frame
>> rates? That is what we are talking about here effectively.
>
>I actually mentioned v4l in context of mmap().
Fair enough. Indeed mmap support is a great feature as is splice support for other uses.
Honestly I was originally waiting for the tracing guys to produce the magic lockless ring buffer that does all of this. Been a long time since I picked up on anything about that though!
Not for replicating the
>same mmap()ed data for multiple clients of course, but IIRC yes, v4l
>allows multiple channels to be opened. E.g. for peeking full video,
>preview and teletext or for switching between video sources on the same
>grabber. Making the whole major node singleton is a bit harsh
>restriction IMHO.
Sure to that but here equivalent is opening main stream an pulling out different frame rates. Equivalent of your example is a multiple sample rate hardware device. Those are handled using multiple instances of iio_Dev.
>
>Best regards,
>Daniel
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