[WebMIDI] Introduce MidiManagerUsb

media/midi/usb_midi_input_stream.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_
 #define MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_
 
 #include <map>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "media/base/media_export.h"
 #include "media/midi/usb_midi_jack.h"
 
 namespace media {
 
 class UsbMidiDevice;
 
 // UsbMidiInputStream converts USB-MIDI data to MIDI data.
 // See "USB Device Class Definition for MIDI Devices" Release 1.0,
 // Section 4 "USB-MIDI Event Packets" for details.
 class MEDIA_EXPORT UsbMidiInputStream {
  public:
-  class Delegate {
+  class MEDIA_EXPORT Delegate {
    public:
     virtual ~Delegate() {}
     // This function is called when some data arrives to a USB-MIDI jack.
     // An input USB-MIDI jack corresponds to an input MIDIPortInfo.
     virtual void OnReceivedData(size_t jack_index,
                                 const uint8* data,
                                 size_t size,
                                 double timestamp) = 0;
   };
 
+  // This is public for testing.
+  struct JackUniqueKey {
+    JackUniqueKey(UsbMidiDevice* device, int endpoint_number, int cable_number);
+    bool operator==(const JackUniqueKey& that) const;
+    bool operator<(const JackUniqueKey& that) const;
+
+    UsbMidiDevice* device;
+    int endpoint_number;
+    int cable_number;
+  };
+
   UsbMidiInputStream(const std::vector<UsbMidiJack>& jacks,
                      Delegate* delegate);
   ~UsbMidiInputStream();
 
   // This function should be called when some data arrives to a USB-MIDI
   // endpoint. This function converts the data to MIDI data and call
   // |delegate->OnReceivedData| with it.
   // |size| must be a multiple of |kPacketSize|.
   void OnReceivedData(UsbMidiDevice* device,
                       int endpoint_number,
                       const uint8* data,
                       size_t size,
                       double timestamp);
 
+  std::vector<JackUniqueKey> RegisteredJackKeysForTesting() const;
+
  private:
   static const size_t kPacketSize = 4;
-  struct JackUniqueKey {
-    JackUniqueKey(UsbMidiDevice* device, int endpoint_number, int cable_number);
-    bool operator==(const JackUniqueKey& that) const;
-    bool operator<(const JackUniqueKey& that) const;
-
-    UsbMidiDevice* device;
-    int endpoint_number;
-    int cable_number;
-  };
-
   // Processes a USB-MIDI Event Packet.
   // The first |kPacketSize| bytes of |packet| must be accessible.
   void ProcessOnePacket(UsbMidiDevice* device,
                         int endpoint_number,
                         const uint8* packet,
                         double timestamp);
 
   // A map from UsbMidiJack to its index in |jacks_|.
   std::map<JackUniqueKey, size_t> jack_dictionary_;
 
   // Not owned
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbMidiInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_