Dear Jassi, Thanks for this very fast answer and for your patch. Indeed, this seems to be exactly what I need. I will try to test your patch in the coming days. I will let you know as soon as I get it working. I suspect that your patch need to be applied on a 3.0 kernel (I am currently using a 2.6.35 kernel so I will need to upgrade). Best regards Adrien On Thu, Sep 8, 2011 at 1:46 PM, Jassi Brar <jaswinder.singh@xxxxxxxxxx> wrote: > 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
