[alsa-devel] Question about sound channel
Hi ALSA ML
I have question about sound channel. If input sound was MONO (= 1ch), but codec supports I2S (= 2ch) only, How to output sound ? What should the driver do in this case ?
Best regards --- Kuninori Morimoto
At Tue, 20 Mar 2012 22:45:18 -0700 (PDT), Kuninori Morimoto wrote:
Hi ALSA ML
I have question about sound channel. If input sound was MONO (= 1ch), but codec supports I2S (= 2ch) only, How to output sound ? What should the driver do in this case ?
The driver should expose its capability just as is, i.e. in your case, support only two channels. Then alsa-lib plugin will do the necessary thing in user-space, such as channel expansions, format conversions, rate conversions, etc.
Takashi
Hi Takashi-san
Thank you for your advice
I have question about sound channel. If input sound was MONO (= 1ch), but codec supports I2S (= 2ch) only, How to output sound ? What should the driver do in this case ?
The driver should expose its capability just as is, i.e. in your case, support only two channels. Then alsa-lib plugin will do the necessary thing in user-space, such as channel expansions, format conversions, rate conversions, etc.
Wow, I didn't know that. Thank you, I understand.
Best regards --- Kuninori Morimoto
participants (2)
-
Kuninori Morimoto -
Takashi Iwai