Re: [PATCH v3 0/2] ALSA: pcm: reinvent the stream synchronization ID API

[Takashi Iwai <tiwai@suse.de>]

On Tue, 07 May 2024 10:26:17 +0200,
Jaroslav Kysela wrote:
> 
> Until the commit e11f0f90a626 ("ALSA: pcm: remove SNDRV_PCM_IOCTL1_INFO
> internal command"), there was a possibility to pass information
> about the synchronized streams to the user space. The mentioned
> commit removed blindly the appropriate code with an irrelevant comment.
> 
> The revert may be appropriate, but since this API was lost for several
> years without any complains, it's time to improve it. The hardware
> parameters may change the used stream clock source (e.g. USB hardware)
> so move this synchronization ID to hw_params as read-only field.
> 
> It seems that pipewire can benefit from this API (disable adaptive
> resampling for perfectly synchronized PCM streams) now.

I find the idea is fine.  But as Sakamoto-san suggested in the
previous thread, it's no urgent issue, and I'm inclined to postpone
the merge after 6.10 merge window.  So let's brew the stuff well for
now.


thanks,

Takashi