On 15 April 2012 00:54, Takashi Iwai tiwai@suse.de wrote:
At Sat, 14 Apr 2012 17:19:23 +0100, Mark Hills wrote:
Some interfaces reference endpoints which do not exists. To accomodate these, do not fail completely, but skip over them.
This allows the Electrix Ebox-44 with earlier firmware to be detected and used for audio.
Does the driver warn something? Ignoring silently doesn't sound right...
I had been looking into UAC2 device side driver. Debugging it, enlightened me of the mess the USB audio implementations are in. IMHO ALSA support usb audio better than AppleUSBAudio ... guess they are too embarrassed of the code that they no longer keep it public :D
Of course, major blame is on buggy implementation/reporting of configuration by the devices.
I was wondering if it would make sense for ALSA to first 'mend' any discrepancies in the reported configuration (say by having optional callbacks registered against vid/pid), and then instantiate the sound card which only refers to the cached sanitized configuration ?
That way, we could write usb-audio core to UAC specification, while keeping vendor specific hacks out separately. Or so do I think.
Regards. -Jassi