On Tue, Sep 6, 2011 at 11:42 PM, Devin Heitmueller <dheitmuel...@kernellabs.com> wrote: > One more thing worth noting before I quit for the night: > > What audio processor is on your WinTV USB 2 device? The DVC-90 has an > emp202. Perhaps the WInTV uses a different audio processor (while > still using an em2820 as the bridge)? That might explain why your > device advertises effectively only one capture rate (32), while mine > advertises a whole range (8-48).
Just took a look at the driver code. Seems we are calling em28xx_analog_audio_set() even if it's not using vendor audio. And that function actually hard-codes the rate to 48KHz. So here's the question: if using snd-usb-audio, should we really be poking at the AC97 registers at all? It seems that doing such can just get the audio processor state out of sync with however snd-usb-audio set it up. For example, the snd-usb-audio driver may very well be configuring the audio to 32 KHz, and then we reset the chip's state to 48Khz when we start streaming without the snd-usb-audio driver's knowledge. It seems like we should only be setting up the AC97 registers if it's an AC97 audio processor *and* it's using vendor audio. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
