On 08/27/2013 02:19 PM, Daniel Holbach wrote: > Hello David, > > On 27.08.2013 14:14, David Henningsson wrote: >> == For porters: if you need to do the same == >> >> Unfortunately, this means some additional work for porters, because you >> need to write UCM mixer files. What's worse, UCM is lacking good >> documentation. For that reason, I hesitated somewhat before deciding to >> actually use UCM at all, but it's the closest we have to a standard for >> setting up mixers on embedded devices right now. >> >> But to give you a two-minute crash course in UCM and how it's used in >> Ubuntu Touch - start by having a look in >> /usr/share/alsa/ucm/apq8064-tabla-snd-card/ directory (shipped with >> alsa-lib). You'll need to create a similar directory for your device. >> You'll find the right directory name if you look in /proc/asound/cards. >> >> Second, look at apq8064-tabla-snd-card.conf. Rename and copy into your >> own UCM directory. If you're making a tablet image (that can't make >> voice calls), you can remove the VoiceCall part (and the corresponding >> file). >> >> Third, look at the HiFi file. This is where all fun happens. Notice the >> device names, which are hardcoded into telepathy-ofono and need to >> match: "Speaker", "Earpiece" and "Headphone" for playback, plus >> "Handset" and "Headset" for recording. >> >> Fourth, if you need voice calls, also look at the VoiceCall file. Btw, >> the verb names "HiFi" and "VoiceCall" also need to match.) This is >> largely empty, because the mixer setup is handled by the Audio HAL, but >> there is a twist here that took a while to get right: For PulseAudio's >> UCM to work, it needs to open a PCM device. However, at the time where >> UCM tests this, the voice call is not yet set up. So, you might need to >> set up the mixer just a little, so that the PCM can open. (On desktops, >> PCM can always open, regardless of mixer state. This is not always true >> on embedded devices, that are using ASoC.) It's a bonus if you can find >> a PCM that actually plays back audio, because then you can get >> notification sounds while on the phone. >> >> And this concludes the two minute crash course - happy porting! > > could we add something like this (maybe even verbatim) to > https://wiki.ubuntu.com/Touch/PortingFlippedInProgress?
I added a link to this message in the "Further reading" section. Maybe I should write something more complete for another day, also when I know a few more problems that porters run into - after all, I only know about the 2 - 4 devices Canonical supports. -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic -- Mailing list: https://launchpad.net/~ubuntu-phone Post to : ubuntu-phone@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-phone More help : https://help.launchpad.net/ListHelp
