media/midi/midi_manager_usb.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_MIDI_MANAGER_USB_H_
   6 #define MEDIA_MIDI_MIDI_MANAGER_USB_H_
   7
   8 #include <utility>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/bind.h"
  13 #include "base/callback.h"
  14 #include "base/containers/hash_tables.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/time/time.h"
  17 #include "media/base/media_export.h"
  18 #include "media/midi/midi_manager.h"
  19 #include "media/midi/usb_midi_device.h"
  20 #include "media/midi/usb_midi_input_stream.h"
  21 #include "media/midi/usb_midi_jack.h"
  22 #include "media/midi/usb_midi_output_stream.h"
  23
  24 namespace media {
  25
  26 // MidiManager for USB-MIDI.
  27 class MEDIA_EXPORT MidiManagerUsb : public MidiManager,
  28                                     public UsbMidiDeviceDelegate,
  29                                     public UsbMidiInputStream::Delegate {
  30  public:
  31   explicit MidiManagerUsb(scoped_ptr<UsbMidiDevice::Factory> device_factory);
  32   ~MidiManagerUsb() override;
  33
  34   // MidiManager implementation.
  35   void StartInitialization() override;
  36   void DispatchSendMidiData(MidiManagerClient* client,
  37                             uint32 port_index,
  38                             const std::vector<uint8>& data,
  39                             double timestamp) override;
  40
  41   // UsbMidiDeviceDelegate implementation.
  42   void ReceiveUsbMidiData(UsbMidiDevice* device,
  43                           int endpoint_number,
  44                           const uint8* data,
  45                           size_t size,
  46                           base::TimeTicks time) override;
  47
  48   // UsbMidiInputStream::Delegate implementation.
  49   void OnReceivedData(size_t jack_index,
  50                       const uint8* data,
  51                       size_t size,
  52                       base::TimeTicks time) override;
  53
  54   const ScopedVector<UsbMidiOutputStream>& output_streams() const {
  55     return output_streams_;
  56   }
  57   const UsbMidiInputStream* input_stream() const { return input_stream_.get(); }
  58
  59   // Initializes this object.
  60   // When the initialization finishes, |callback| will be called with the
  61   // result.
  62   // When this factory is destroyed during the operation, the operation
  63   // will be canceled silently (i.e. |callback| will not be called).
  64   // The function is public just for unit tests. Do not call this function
  65   // outside code for testing.
  66   void Initialize(base::Callback<void(MidiResult result)> callback);
  67
  68  private:
  69   void OnEnumerateDevicesDone(bool result, UsbMidiDevice::Devices* devices);
  70
  71   scoped_ptr<UsbMidiDevice::Factory> device_factory_;
  72   ScopedVector<UsbMidiDevice> devices_;
  73   ScopedVector<UsbMidiOutputStream> output_streams_;
  74   scoped_ptr<UsbMidiInputStream> input_stream_;
  75
  76   base::Callback<void(MidiResult result)> initialize_callback_;
  77
  78   // A map from <endpoint_number, cable_number> to the index of input jacks.
  79   base::hash_map<std::pair<int, int>, size_t> input_jack_dictionary_;
  80
  81   DISALLOW_COPY_AND_ASSIGN(MidiManagerUsb);
  82 };
  83
  84 }  // namespace media
  85
  86 #endif  // MEDIA_MIDI_MIDI_MANAGER_USB_H_