include/uapi/sound/usb_stream.h

   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 */