linux-kernel - [PATCH] usbaudio: Fix wrong bitrate for Creative Creative VF0470 Live Cam

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Message-Id: <201003021452.28716.arseniy@fizlesh.ru>
Date:	Tue, 2 Mar 2010 14:52:28 +0300
From:	Arseniy Lartsev <arseniy@...lesh.ru>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] usbaudio: Fix wrong bitrate for Creative Creative VF0470 Live Cam

This patch works around misbehaviour of Creative Creative VF0470 Live Cam
which reports 16 kHz sample rate for audio capture while actually producing
8 kHz stream.

Signed-off-by: Arseniy Lartsev <arseniy@...lesh.ru>

--
diff -rup linux-2.6.33-rc8-orig/sound/usb/usbaudio.c linux-2.6.33-
rc8/sound/usb/usbaudio.c
--- linux-2.6.33-rc8-orig/sound/usb/usbaudio.c
+++ linux-2.6.33-rc8/sound/usb/usbaudio.c
@@ -2513,6 +2513,9 @@ static int parse_audio_format_rates(stru
 			     chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
 			    fp->altsetting == 5 && fp->maxpacksize == 392)
 				rate = 96000;
+			/* Creative VF0470 Live Cam reports 16 kHz instead of 8 */
+			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;
--
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