Thanks for the clarification. I was thinking the anon_inode:snd-pcm FD replaced the /dev/snd/pcm FD. > fd1 - /dev/snd/pcm (HAL) - standard sound device inode (no restrictions) > fd2 - anon_inode:snd-pcm-buffer (for the EXCLUSIVE access) That sounds right. Thanks again for this work. ALSA is very important for Android Audio. Phil Burk On Fri, Feb 1, 2019 at 8:28 AM Jaroslav Kysela <perex@xxxxxxxx> wrote: > Dne 1.2.2019 v 16:31 Phil Burk napsal(a): > > Thank you all for sorting this out. It seems like we are moving in a > > really good direction. > > > >> I agree. We can have just two modes for the beginning: > >> a) full one (useful for testing) > >> b) buffer only (allow just sound data mmap) > > > > The full one is would also be used by the HAL for querying the DSP > position. > > > >> if we should use different names (like anon_inode:snd-pcm and > > anon_inode:snd-pcm-buffer) > > > > That would be helpful. > > > > I have attached a revised requirements doc. The original doc was more of > > a HowTo for OEMs to create the "anon_inode:dmabuf" FD.. This clarifies > > the requirements and allows for the use of "anon_inode:snd-pcm*". It > > should match what we have arrived at by discussion. Let me know if it > > makes sense. > > It looks fine, but the HAL will use probably the standard sound device > open (/dev/snd/), doesn't? So: > > fd1 - /dev/snd/pcm (HAL) - standard sound device inode (no restrictions) > fd2 - anon_inode:snd-pcm-buffer (for the EXCLUSIVE access) > > With modes, I talked about the anonymous dup ioctl parameter. If there's > another resource manager above HAL, the situation might be: > > fd1 - /dev/snd/pcm (resource manager) - standard sound device inode > fd2 - anon_inode:snd-pcm (access to the full pcm sound API using the > anonymous inode) > fd3 - anon_inode:snd-pcm-buffer (for the EXCLUSIVE access) > > Perhaps you have different layers in Android. > > Thanks, > Jaroslav > > > -- > Jaroslav Kysela <perex@xxxxxxxx> > Linux Sound Maintainer; ALSA Project; Red Hat, Inc. > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
