audio_class.patch

ISP 1761 usb host driver for linux

diff -Naur linux-2.6.20_old/sound/usb/usbaudio.c linux-2.6.20_new/sound/usb/usbaudio.c
--- linux-2.6.20_old/sound/usb/usbaudio.c	2007-02-05 02:44:54.000000000 +0800
+++ linux-2.6.20_new/sound/usb/usbaudio.c	2007-05-14 15:11:15.000000000 +0800
@@ -68,7 +68,7 @@
 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Vendor ID for this card */
 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Product ID for this card */
-static int nrpacks = 8;		/* max. number of packets per urb */
+static int nrpacks = 2;		/* max. number of packets per urb */
 static int async_unlink = 1;
 static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
 
@@ -102,8 +102,8 @@
 
 #define MAX_PACKS	20
 #define MAX_PACKS_HS	(MAX_PACKS * 8)	/* in high speed mode */
-#define MAX_URBS	8
-#define SYNC_URBS	4	/* always four urbs for sync */
+#define MAX_URBS	2
+#define SYNC_URBS	1	/* always four urbs for sync */
 #define MIN_PACKS_URB	1	/* minimum 1 packet per urb */
 
 struct audioformat {