On 8 September 2011 17:02, Adrien Decostre <ad.decostre@xxxxxxxxx> wrote: > > I am currently doing some experiments with the g_audio USB gadget. In > fact, I would like to be able to process in user-space the PCM stream > sent by the host and captured by the g_audio gadget driver. > > Is this functionality already supported by the current implementation > or is the data path hard-coded in g_audio? I am afraid extant f_audio.c hardcodes sinking OUT data directly to the physical codec on board. There is no option to route it to user-space. > In the case this functionality is already supported, how can the PCM > stream be retrieved from user-space? Would it be needed to emulate a > virtual ALSA sound card in user space or is it possible to directly > “connect” to g_audio via the ALSA library API? A virtual ALSA sound card needs to be exposed by the audio gadget driver. My recently submitted driver is exactly what you need. I was supposed to revise it as per Felipe Balbi's comments, but got busy with official work. Hopefully by this weekend, I'll re-submit. Functionality wise though, you can test that even today and provide some feedback so that I can improve it even further. http://www.spinics.net/lists/linux-usb/msg50854.html http://www.spinics.net/lists/linux-usb/msg50855.html -jassi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
