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/compiler_specific.h"
  15 #include "base/containers/hash_tables.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/time/time.h"
  18 #include "media/midi/midi_manager.h"
  19 #include "media/midi/usb_midi_device.h"
  20 #include "media/midi/usb_midi_export.h"
  21 #include "media/midi/usb_midi_input_stream.h"
  22 #include "media/midi/usb_midi_jack.h"
  23 #include "media/midi/usb_midi_output_stream.h"
  24
  25 namespace media {
  26 namespace midi {
  27
  28 class MidiScheduler;
  29
  30 // MidiManager for USB-MIDI.
  31 class USB_MIDI_EXPORT MidiManagerUsb
  32     : public MidiManager,
  33       public UsbMidiDeviceDelegate,
  34       NON_EXPORTED_BASE(public UsbMidiInputStream::Delegate) {
  35  public:
  36   explicit MidiManagerUsb(scoped_ptr<UsbMidiDevice::Factory> device_factory);
  37   ~MidiManagerUsb() override;
  38
  39   // MidiManager implementation.
  40   void StartInitialization() override;
  41   void DispatchSendMidiData(MidiManagerClient* client,
  42                             uint32 port_index,
  43                             const std::vector<uint8>& data,
  44                             double timestamp) override;
  45
  46   // UsbMidiDeviceDelegate implementation.
  47   void ReceiveUsbMidiData(UsbMidiDevice* device,
  48                           int endpoint_number,
  49                           const uint8* data,
  50                           size_t size,
  51                           base::TimeTicks time) override;
  52   void OnDeviceAttached(scoped_ptr<UsbMidiDevice> device) override;
  53   void OnDeviceDetached(size_t index) override;
  54
  55   // UsbMidiInputStream::Delegate implementation.
  56   void OnReceivedData(size_t jack_index,
  57                       const uint8* data,
  58                       size_t size,
  59                       base::TimeTicks time) override;
  60
  61   const ScopedVector<UsbMidiOutputStream>& output_streams() const {
  62     return output_streams_;
  63   }
  64   const UsbMidiInputStream* input_stream() const { return input_stream_.get(); }
  65
  66   // Initializes this object.
  67   // When the initialization finishes, |callback| will be called with the
  68   // result.
  69   // When this factory is destroyed during the operation, the operation
  70   // will be canceled silently (i.e. |callback| will not be called).
  71   // The function is public just for unit tests. Do not call this function
  72   // outside code for testing.
  73   void Initialize(base::Callback<void(Result result)> callback);
  74
  75  private:
  76   void OnEnumerateDevicesDone(bool result, UsbMidiDevice::Devices* devices);
  77   bool AddPorts(UsbMidiDevice* device, int device_id);
  78
  79   scoped_ptr<UsbMidiDevice::Factory> device_factory_;
  80   ScopedVector<UsbMidiDevice> devices_;
  81   ScopedVector<UsbMidiOutputStream> output_streams_;
  82   scoped_ptr<UsbMidiInputStream> input_stream_;
  83
  84   base::Callback<void(Result result)> initialize_callback_;
  85
  86   // A map from <endpoint_number, cable_number> to the index of input jacks.
  87   base::hash_map<std::pair<int, int>, size_t> input_jack_dictionary_;
  88
  89   scoped_ptr<MidiScheduler> scheduler_;
  90
  91   DISALLOW_COPY_AND_ASSIGN(MidiManagerUsb);
  92 };
  93
  94 }  // namespace midi
  95 }  // namespace media
  96
  97 #endif  // MEDIA_MIDI_MIDI_MANAGER_USB_H_