+ struct snd_usX2Y_hwdep_pcm_shm *hwdep_pcm_shm;
+ struct snd_usX2Y_substream *subs[4];
+ struct snd_usX2Y_substream * volatile prepare_subs;
+ wait_queue_head_t prepare_wait_queue;
+};
+
+
+struct snd_usX2Y_substream {
+ struct usX2Ydev *usX2Y;
+ struct snd_pcm_substream *pcm_substream;
+
+ int endpoint;
+ unsigned int maxpacksize; /* max packet size in bytes */
+
+ atomic_t state;
+#define state_STOPPED 0
+#define state_STARTING1 1
+#define state_STARTING2 2
+#define state_STARTING3 3
+#define state_PREPARED 4
+#define state_PRERUNNING 6
+#define state_RUNNING 8
+
+ int hwptr; /* free frame position in the buffer (only for playback) */
+ int hwptr_done; /* processed frame position in the buffer */
+ int transfer_done; /* processed frames since last period update */
+
+ struct urb *urb[NRURBS]; /* data urb table */
+ struct urb *completed_urb;
+ char *tmpbuf; /* temporary buffer for playback */
+};