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      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 void StartInitialization() 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_
     81