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
28 struct usb_stream_packet {
29 unsigned offset;
30 unsigned length;
31 };
32
33
34 struct usb_stream_config {
35 unsigned version;
36 unsigned sample_rate;
37 unsigned period_frames;
38 unsigned frame_size;
39 };
40
41 struct 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
67 enum 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 */