1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#ifndef _UAPI__SOUND_USB_STREAM_H
21#define _UAPI__SOUND_USB_STREAM_H
22
23#define USB_STREAM_INTERFACE_VERSION 2
24
25#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
26	_IOW('H', 0x90, struct usb_stream_config)
27
28struct usb_stream_packet {
29	unsigned offset;
30	unsigned length;
31};
32
33
34struct usb_stream_config {
35	unsigned version;
36	unsigned sample_rate;
37	unsigned period_frames;
38	unsigned frame_size;
39};
40
41struct usb_stream {
42	struct usb_stream_config cfg;
43	unsigned read_size;
44	unsigned write_size;
45
46	int period_size;
47
48	unsigned state;
49
50	int idle_insize;
51	int idle_outsize;
52	int sync_packet;
53	unsigned insize_done;
54	unsigned periods_done;
55	unsigned periods_polled;
56
57	struct usb_stream_packet outpacket[2];
58	unsigned		 inpackets;
59	unsigned		 inpacket_head;
60	unsigned		 inpacket_split;
61	unsigned		 inpacket_split_at;
62	unsigned		 next_inpacket_split;
63	unsigned		 next_inpacket_split_at;
64	struct usb_stream_packet inpacket[0];
65};
66
67enum usb_stream_state {
68	usb_stream_invalid,
69	usb_stream_stopped,
70	usb_stream_sync0,
71	usb_stream_sync1,
72	usb_stream_ready,
73	usb_stream_running,
74	usb_stream_xrun,
75};
76
77#endif /* _UAPI__SOUND_USB_STREAM_H */
78