hi all
i'm trying to set up my pd 0.37 for my maudio quattro. i used to define a quattro device with 4 channels in an .asoundrc file, but pd doesn't want to start with the -alsadev flag.
in the audio settings dialog, i can select the USB Audio Quattro, but both hardware and plugin mode only use 2 channels (even if i set 4 channels). any ideas?
using the oss layer, i can use either the first or the second 2 channels, but when using multiple devices, it won't work, too...
any clues?
Tim mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.nyds-exp-discogs.tk -- The only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn, like fabulous yellow roman candles exploding like spiders across the stars and in the middle you see the blue centerlight pop and everybody goes "Awww!" Jack Kerouac
Hallo,
Tim Blechmann hat gesagt: // Tim Blechmann wrote:
i'm trying to set up my pd 0.37 for my maudio quattro. i used to define a quattro device with 4 channels in an .asoundrc file, but pd doesn't want to start with the -alsadev flag.
in the audio settings dialog, i can select the USB Audio Quattro, but both hardware and plugin mode only use 2 channels (even if i set 4 channels). any ideas?
using the oss layer, i can use either the first or the second 2 channels, but when using multiple devices, it won't work, too...
any clues?
On my laptop I had the same problem but with Pd 0.36. I'm now using the Jack interface there.
The old -alsadev flag is obsolete now, -audiodev should replace it, but it only accepts device numbers, which assumes that devices can be numbered. With ALSA, this is not the case: the user can define any name for any kind of audio-pcm. No one can guess what's in a user's asoundrc.
The only real solution to this would be to enable the (ALSA-)user to
select devices by a device string. Then this string should be used in
snd_pcm_open. Pd doesn't do this currently. It assumes:
/* device names are hw:0, plughw:0, hw:1, and so on. */
[from: s_alsa_audio.c]
For example: In the s_audio_alsa.c code, there is a function "alsa_getdevs" which looks for ALSA devices "by card":
/* For each hardware card found, we list two devices, the "hard" and
"plug" one. The card scan is derived from portaudio code. */
[from: s_alsa_audio.c]
The problem is, that the Quatto asoundrc definitions on alsa-project.org, that most people use, don't correspond to this schema: they are arbitrary names.
I don't know, how Portaudio copes with this. The comment above doesn't look good. ;) As Pd did the switch to Portaudio, which is a good thing, IMO, this area might be worth investigating.
ciao
Frank Barknecht _ ______footils.org__
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Frank Barknecht -
Tim Blechmann