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 */
78