Thomas Witzel wrote: > Hello, > > I'm now trying to create a sound driver that will start and stop playback in > real time. Is it better to implement a driver for RTDM from scratch, or is it > reasonable to just add a RTDM interface for the required functionality to an > existing ALSA driver ? The advantage of the latter approach is of course, > that everything that doesn't need to be done in realtime already exists > through ALSA and I only would have to implement the pcm triggers through > RTDM. Is that reasonable at all ?
Yes, this can be reasonable. You will fork the driver effectively, but you should be able to reuse init/cleanup parts for this. Basically, this is how most RTnet drivers were developed. But how hard and how tight are your RT requirements? I'm asking because I know that a lot of people are using unmodified ALSA drivers over the PREEMPT_RT kernel for real-time recording, processing, and playback. Maybe this can already provide you what you need. But I don't know the internal design of ALSA, if there are any pitfalls hidden like dynamic buffer management. Jan
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