Messages in this thread | | | Date | Fri, 3 May 2024 10:47:19 +0900 | From | Mark Brown <> | Subject | Re: [PATCH v15 00/16] Add audio support in v4l2 framework |
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On Thu, May 02, 2024 at 10:26:43AM +0100, Mauro Carvalho Chehab wrote: > Mauro Carvalho Chehab <mchehab@kernel.org> escreveu:
> > There are still time control associated with it, as audio and video > > needs to be in sync. This is done by controlling the buffers size > > and could be fine-tuned by checking when the buffer transfer is done.
...
> Just complementing: on media, we do this per video buffer (or > per half video buffer). A typical use case on cameras is to have > buffers transferred 30 times per second, if the video was streamed > at 30 frames per second.
IIRC some big use case for this hardware was transcoding so there was a desire to just go at whatever rate the hardware could support as there is no interactive user consuming the output as it is generated.
> I would assume that, on an audio/video stream, the audio data > transfer will be programmed to also happen on a regular interval.
With audio the API is very much "wake userspace every Xms". [unhandled content-type:application/pgp-signature] | |