include/uapi/sound/usb_stream.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
   4  */
   5
   6 #ifndef _UAPI__SOUND_USB_STREAM_H
   7 #define _UAPI__SOUND_USB_STREAM_H
   8
   9 #define USB_STREAM_INTERFACE_VERSION 2
  10
  11 #define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
  12         _IOW('H', 0x90, struct usb_stream_config)
  13
  14 struct usb_stream_packet {
  15         unsigned offset;
  16         unsigned length;
  17 };
  18
  19
  20 struct usb_stream_config {
  21         unsigned version;
  22         unsigned sample_rate;
  23         unsigned period_frames;
  24         unsigned frame_size;
  25 };
  26
  27 struct usb_stream {
  28         struct usb_stream_config cfg;
  29         unsigned read_size;
  30         unsigned write_size;
  31
  32         int period_size;
  33
  34         unsigned state;
  35
  36         int idle_insize;
  37         int idle_outsize;
  38         int sync_packet;
  39         unsigned insize_done;
  40         unsigned periods_done;
  41         unsigned periods_polled;
  42
  43         struct usb_stream_packet outpacket[2];
  44         unsigned                 inpackets;
  45         unsigned                 inpacket_head;
  46         unsigned                 inpacket_split;
  47         unsigned                 inpacket_split_at;
  48         unsigned                 next_inpacket_split;
  49         unsigned                 next_inpacket_split_at;
  50         struct usb_stream_packet inpacket[];
  51 };
  52
  53 enum usb_stream_state {
  54         usb_stream_invalid,
  55         usb_stream_stopped,
  56         usb_stream_sync0,
  57         usb_stream_sync1,
  58         usb_stream_ready,
  59         usb_stream_running,
  60         usb_stream_xrun,
  61 };
  62
  63 #endif /* _UAPI__SOUND_USB_STREAM_H */