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  * 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 */