LXR linux/include/uapi/sound/usb

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