linux-kernel - Re: PROBLEM: Wrong bitrate when capturing sound from Creative webcam

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Date:	Tue, 02 Mar 2010 11:31:53 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Arseniy Lartsev <ars3n@...dex.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Wrong bitrate when capturing sound from Creative webcam

At Wed, 24 Feb 2010 20:18:38 +0300,
Arseniy Lartsev wrote:
> 
> Hello,
> 
> I've got an USB webcam (Creative VF0470 Live Cam Notebook). The problem
> is that sound from it's microphone is captured with wrong bitrate.
> Apparently it reports 16000 Hz while it should actually be 8000 (so
> the sound is 2x faster).
> 
> The following patch works for me:
> --- linux-2.6.33-rc8/sound/usb/usbaudio.c
> +++ linux-2.6.33-rc8-new/sound/usb/usbaudio.c
> @@ -2513,6 +2513,8 @@ static int parse_audio_format_rates(stru
>  			     chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
>  			    fp->altsetting == 5 && fp->maxpacksize == 392)
>  				rate = 96000;
> +			if ((rate == 16000) && (chip->usb_id = USB_ID(0x041e, 0x4068)))
> +				rate = 8000;
>  			fp->rate_table[fp->nr_rates] = rate;
>  			if (!fp->rate_min || rate < fp->rate_min)
>  				fp->rate_min = rate;
> 
> I'm not sure if this is correct, maybe there should be more conditions
> to identify this particular camera.

The change looks good to me.  Could you give your sign-off for merge,
preferably repost in a right patch style?


thanks,

Takashi
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