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_manager.h"
  18 #include "media/midi/midi_port_info.h"
  19
  20 namespace media {
  21
  22 class MEDIA_EXPORT MidiManagerMac : public MidiManager {
  23  public:
  24   MidiManagerMac();
  25   ~MidiManagerMac() override;
  26
  27   // MidiManager implementation.
  28   void StartInitialization() override;
  29   void DispatchSendMidiData(MidiManagerClient* client,
  30                             uint32 port_index,
  31                             const std::vector<uint8>& data,
  32                             double timestamp) override;
  33
  34  private:
  35   // Runs a closure on |client_thread_|. It starts the thread if it isn't
  36   // running and the destructor isn't called.
  37   // Caller can bind base::Unretained(this) to |closure| since we join
  38   // |client_thread_| in the destructor.
  39   void RunOnClientThread(const base::Closure& closure);
  40
  41   // Initializes CoreMIDI on |client_thread_| asynchronously. Called from
  42   // StartInitialization().
  43   void InitializeCoreMIDI();
  44
  45   // CoreMIDI callback for MIDI data.
  46   // Each callback can contain multiple packets, each of which can contain
  47   // multiple MIDI messages.
  48   static void ReadMidiDispatch(
  49       const MIDIPacketList *pktlist,
  50       void *read_proc_refcon,
  51       void *src_conn_refcon);
  52   virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList *pktlist);
  53
  54   // An internal callback that runs on MidiSendThread.
  55   void SendMidiData(MidiManagerClient* client,
  56                     uint32 port_index,
  57                     const std::vector<uint8>& data,
  58                     double timestamp);
  59
  60   // CoreMIDI
  61   MIDIClientRef midi_client_;
  62   MIDIPortRef coremidi_input_;
  63   MIDIPortRef coremidi_output_;
  64
  65   enum{ kMaxPacketListSize = 512 };
  66   char midi_buffer_[kMaxPacketListSize];
  67   MIDIPacketList* packet_list_;
  68   MIDIPacket* midi_packet_;
  69
  70   typedef std::map<MIDIEndpointRef, uint32> SourceMap;
  71
  72   // Keeps track of the index (0-based) for each of our sources.
  73   SourceMap source_map_;
  74
  75   // Keeps track of all destinations.
  76   std::vector<MIDIEndpointRef> destinations_;
  77
  78   // |client_thread_| is used to handle platform dependent operations.
  79   base::Thread client_thread_;
  80
  81   // Sets true on destructing object to avoid starting |client_thread_| again.
  82   bool shutdown_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(MidiManagerMac);
  85 };
  86
  87 }  // namespace media
  88
  89 #endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_