Hi David,
> AFAIK, the driver should support what the hardware supports.
Yes. It's my intent to add the rules between channels/rates.
Well, today I did some tests for an idea to use 'plug' plugin.
> 1) Edit /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf
> and change "hw:%f" to "plughw:%f" in the section
> "Mapping analog-stereo". If the plughw plugin can upscale,
> then that should make things work.
This wasn't good. Then I remembered this fact:
> Hm. Actually PulseAudio tries opening "plug:hw:1" too and setting the
> channel number to two fails in that case too. If the "plug" plugin can
> change the number of channels, then that should have been working.
Then I debug PulseAudio/libasound in a point of 'how to open ALSA PCM
handle'. I have an presumption that 'plug' plugin can upscale channels
correctly if PulseAudio open 'plug:hw' device as the same way as
normal-aplay open.
As a result, I got a conviction that 'SND_PCM_NO_AUTO_CHANNELS' flag
for snd_pcm_open() disables upscaling.
I can reproduce it with this program (it's too rough):
http://ubuntuone.com/4T5tqqiioUZMFBe4d5I4Zn
So I conclude we cannot use 'plug' plugin for this purpose. Would you
please confirm this in your side?
And for these two options below, I need more time to test.
> To aid for applications, one can add custom per-card mapping in
> alsa-lib - e g, look at /usr/share/alsa/cards/ICE1712.conf where you
> can open the device "front:<card>" with two channels and it
> automatically upscales to 10 or 12 channels.
> 2) Alternatively, you could add channels to your mapping:
> channel-map =
> left,right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7,
> aux8,aux9,aux10,aux11
Thanks for your help
Takashi Sakamoto
[email protected]
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