1/*
2 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19#ifndef _UAPI__SOUND_USB_STREAM_H
20#define _UAPI__SOUND_USB_STREAM_H
21
22#define USB_STREAM_INTERFACE_VERSION 2
23
24#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
25	_IOW('H', 0x90, struct usb_stream_config)
26
27struct usb_stream_packet {
28	unsigned offset;
29	unsigned length;
30};
31
32
33struct usb_stream_config {
34	unsigned version;
35	unsigned sample_rate;
36	unsigned period_frames;
37	unsigned frame_size;
38};
39
40struct usb_stream {
41	struct usb_stream_config cfg;
42	unsigned read_size;
43	unsigned write_size;
44
45	int period_size;
46
47	unsigned state;
48
49	int idle_insize;
50	int idle_outsize;
51	int sync_packet;
52	unsigned insize_done;
53	unsigned periods_done;
54	unsigned periods_polled;
55
56	struct usb_stream_packet outpacket[2];
57	unsigned		 inpackets;
58	unsigned		 inpacket_head;
59	unsigned		 inpacket_split;
60	unsigned		 inpacket_split_at;
61	unsigned		 next_inpacket_split;
62	unsigned		 next_inpacket_split_at;
63	struct usb_stream_packet inpacket[0];
64};
65
66enum usb_stream_state {
67	usb_stream_invalid,
68	usb_stream_stopped,
69	usb_stream_sync0,
70	usb_stream_sync1,
71	usb_stream_ready,
72	usb_stream_running,
73	usb_stream_xrun,
74};
75
76#endif /* _UAPI__SOUND_USB_STREAM_H */
77