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/compiler_specific.h"
  15 #include "base/threading/thread.h"
  16 #include "media/midi/midi_manager.h"
  17 #include "media/midi/midi_port_info.h"
  18
  19 namespace media {
  20
  21 class MEDIA_EXPORT MidiManagerMac : public MidiManager {
  22  public:
  23   MidiManagerMac();
  24   virtual ~MidiManagerMac();
  25
  26   // MidiManager implementation.
  27   virtual bool Initialize() OVERRIDE;
  28   virtual void DispatchSendMidiData(MidiManagerClient* client,
  29                                     uint32 port_index,
  30                                     const std::vector<uint8>& data,
  31                                     double timestamp) OVERRIDE;
  32
  33  private:
  34   // CoreMIDI callback for MIDI data.
  35   // Each callback can contain multiple packets, each of which can contain
  36   // multiple MIDI messages.
  37   static void ReadMidiDispatch(
  38       const MIDIPacketList *pktlist,
  39       void *read_proc_refcon,
  40       void *src_conn_refcon);
  41   virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList *pktlist);
  42
  43   // An internal callback that runs on MidiSendThread.
  44   void SendMidiData(MidiManagerClient* client,
  45                     uint32 port_index,
  46                     const std::vector<uint8>& data,
  47                     double timestamp);
  48
  49   // Helper
  50   static media::MidiPortInfo GetPortInfoFromEndpoint(MIDIEndpointRef endpoint);
  51   static double MIDITimeStampToSeconds(MIDITimeStamp timestamp);
  52   static MIDITimeStamp SecondsToMIDITimeStamp(double seconds);
  53
  54   // CoreMIDI
  55   MIDIClientRef midi_client_;
  56   MIDIPortRef coremidi_input_;
  57   MIDIPortRef coremidi_output_;
  58
  59   enum{ kMaxPacketListSize = 512 };
  60   char midi_buffer_[kMaxPacketListSize];
  61   MIDIPacketList* packet_list_;
  62   MIDIPacket* midi_packet_;
  63
  64   typedef std::map<MIDIEndpointRef, uint32> SourceMap;
  65
  66   // Keeps track of the index (0-based) for each of our sources.
  67   SourceMap source_map_;
  68
  69   // Keeps track of all destinations.
  70   std::vector<MIDIEndpointRef> destinations_;
  71
  72   // |send_thread_| is used to send MIDI data.
  73   base::Thread send_thread_;
  74
  75   DISALLOW_COPY_AND_ASSIGN(MidiManagerMac);
  76 };
  77
  78 }  // namespace media
  79
  80 #endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_