Dear all,
I'm working on a board that is equipped with a Bluetooth chip and a gsm phone, both connected to the CPU (AM3352) on 2 different pcm. I wrote the codecs and they are working (read as: I can play/record on both devices). What I want to achieve now is to route those pcm together and still being able to (at least) play audio on both. I tried alsaloop, but it eats too much CPU (80% +) even in half duplex loop (BT capture => GSM playback), and it was the only application running. In [1] I saw that I should be able to route the codec together in kernel space (to avoid data copy between user and kernel spaces). I did not tried that solution yet because it's not really clear to me how to implement it, any suggestions/examples? If I follow that solution, can I still use those PCM to playback my audio file (I see that I can disconnect that link through a mixer control, so this should be possible)?
Again any suggestion is really appreciated.
Best regards, Gabriele
[1]: https://www.kernel.org/doc/html/latest/sound/soc/dpcm.html#hostless-pcm-stre...