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/midi/usb_midi_export.h"
  10
  11 namespace media {
  12 namespace midi {
  13
  14 class UsbMidiDevice;
  15
  16 // UsbMidiJack represents an EMBEDDED MIDI jack.
  17 struct USB_MIDI_EXPORT UsbMidiJack {
  18   // The direction of the endpoint associated with an EMBEDDED MIDI jack.
  19   // Note that an IN MIDI jack associated with an OUT endpoint has
  20   // ***DIRECTION_OUT*** direction.
  21   enum Direction {
  22     DIRECTION_IN,
  23     DIRECTION_OUT,
  24   };
  25   UsbMidiJack(UsbMidiDevice* device,
  26               uint8 jack_id,
  27               uint8 cable_number,
  28               uint8 endpoint_address)
  29       : device(device),
  30         jack_id(jack_id),
  31         cable_number(cable_number),
  32         endpoint_address(endpoint_address) {}
  33   // Not owned
  34   UsbMidiDevice* device;
  35   // The id of this jack unique in the interface.
  36   uint8 jack_id;
  37   // The cable number of this jack in the associated endpoint.
  38   uint8 cable_number;
  39   // The address of the endpoint that this jack is associated with.
  40   uint8 endpoint_address;
  41
  42   Direction direction() const {
  43     return (endpoint_address & 0x80) ? DIRECTION_IN : DIRECTION_OUT;
  44   }
  45   uint8 endpoint_number() const {
  46     return (endpoint_address & 0xf);
  47   }
  48 };
  49
  50 }  // namespace midi
  51 }  // namespace media
  52
  53 #endif  // MEDIA_MIDI_USB_MIDI_JACK_H_