media/midi/usb_midi_jack.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_MIDI_USB_MIDI_JACK_H_
   6 #define MEDIA_MIDI_USB_MIDI_JACK_H_
   7
   8 #include "base/basictypes.h"
   9 #include "media/base/media_export.h"
  10
  11 namespace media {
  12
  13 class UsbMidiDevice;
  14
  15 // UsbMidiJack represents an EMBEDDED MIDI jack.
  16 struct MEDIA_EXPORT UsbMidiJack {
  17   // The direction of the endpoint associated with an EMBEDDED MIDI jack.
  18   // Note that an IN MIDI jack associated with an OUT endpoint has
  19   // ***DIRECTION_OUT*** direction.
  20   enum Direction {
  21     DIRECTION_IN,
  22     DIRECTION_OUT,
  23   };
  24   UsbMidiJack(UsbMidiDevice* device,
  25               uint8 jack_id,
  26               uint8 cable_number,
  27               uint8 endpoint_address)
  28       : device(device),
  29         jack_id(jack_id),
  30         cable_number(cable_number),
  31         endpoint_address(endpoint_address) {}
  32   // Not owned
  33   UsbMidiDevice* device;
  34   // The id of this jack unique in the interface.
  35   uint8 jack_id;
  36   // The cable number of this jack in the associated endpoint.
  37   uint8 cable_number;
  38   // The address of the endpoint that this jack is associated with.
  39   uint8 endpoint_address;
  40
  41   Direction direction() const {
  42     return (endpoint_address & 0x80) ? DIRECTION_IN : DIRECTION_OUT;
  43   }
  44   uint8 endpoint_number() const {
  45     return (endpoint_address & 0xf);
  46   }
  47 };
  48
  49 }  // namespace media
  50
  51 #endif  // MEDIA_MIDI_USB_MIDI_JACK_H_