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