media/midi/midi_manager_mac.h

   1 // Copyright (c) 2013 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_MAC_H_
   6 #define MEDIA_MIDI_MIDI_MANAGER_MAC_H_
   7
   8 #include <CoreMIDI/MIDIServices.h>
   9 #include <map>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/callback.h"
  15 #include "base/compiler_specific.h"
  16 #include "base/threading/thread.h"
  17 #include "media/midi/midi_export.h"
  18 #include "media/midi/midi_manager.h"
  19 #include "media/midi/midi_port_info.h"
  20
  21 namespace media {
  22 namespace midi {
  23
  24 class MIDI_EXPORT MidiManagerMac final : public MidiManager {
  25  public:
  26   MidiManagerMac();
  27   ~MidiManagerMac() override;
  28
  29   // MidiManager implementation.
  30   void StartInitialization() override;
  31   void DispatchSendMidiData(MidiManagerClient* client,
  32                             uint32 port_index,
  33                             const std::vector<uint8>& data,
  34                             double timestamp) override;
  35
  36  private:
  37   // Runs a closure on |client_thread_|. It starts the thread if it isn't
  38   // running and the destructor isn't called.
  39   // Caller can bind base::Unretained(this) to |closure| since we join
  40   // |client_thread_| in the destructor.
  41   void RunOnClientThread(const base::Closure& closure);
  42
  43   // Initializes CoreMIDI on |client_thread_| asynchronously. Called from
  44   // StartInitialization().
  45   void InitializeCoreMIDI();
  46
  47   // CoreMIDI callback for MIDI notification.
  48   // Receives MIDI related event notifications from CoreMIDI.
  49   static void ReceiveMidiNotifyDispatch(const MIDINotification* message,
  50                                         void* refcon);
  51   void ReceiveMidiNotify(const MIDINotification* message);
  52
  53   // CoreMIDI callback for MIDI data.
  54   // Each callback can contain multiple packets, each of which can contain
  55   // multiple MIDI messages.
  56   static void ReadMidiDispatch(const MIDIPacketList* packet_list,
  57                                void* read_proc_refcon,
  58                                void* src_conn_refcon);
  59   virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList *pktlist);
  60
  61   // An internal callback that runs on MidiSendThread.
  62   void SendMidiData(MidiManagerClient* client,
  63                     uint32 port_index,
  64                     const std::vector<uint8>& data,
  65                     double timestamp);
  66
  67   // CoreMIDI
  68   MIDIClientRef midi_client_;
  69   MIDIPortRef coremidi_input_;
  70   MIDIPortRef coremidi_output_;
  71   std::vector<uint8> midi_buffer_;
  72
  73   // Keeps track of the index (0-based) for each of our sources.
  74   typedef std::map<MIDIEndpointRef, uint32> SourceMap;
  75   SourceMap source_map_;
  76
  77   // Keeps track of all destinations.
  78   typedef std::vector<MIDIEndpointRef> DestinationVector;
  79   DestinationVector destinations_;
  80
  81   // |client_thread_| is used to handle platform dependent operations.
  82   base::Thread client_thread_;
  83
  84   // Sets true on destructing object to avoid starting |client_thread_| again.
  85   bool shutdown_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(MidiManagerMac);
  88 };
  89
  90 }  // namespace midi
  91 }  // namespace media
  92
  93 #endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_