#define MAXPACK 50#define MAXBUFFERMS 100#define MAXSTRIDE 3#define SSS (((MAXPACK*MAXBUFFERMS*MAXSTRIDE + 4096) / 4096) * 4096)struct snd_usX2Y_hwdep_pcm_shm {	char playback[SSS];	char capture0x8[SSS];	char capture0xA[SSS];	volatile int playback_iso_head;	int playback_iso_start;	struct {		int	frame,			offset,			length;	} captured_iso[128];	volatile int captured_iso_head;	volatile unsigned captured_iso_frames;	int capture_iso_start;};typedef struct snd_usX2Y_hwdep_pcm_shm snd_usX2Y_hwdep_pcm_shm_t;