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 "media/midi/midi_manager.h"
  16 #include "media/midi/midi_port_info.h"
  17
  18 namespace media {
  19
  20 class MEDIA_EXPORT MIDIManagerMac : public MIDIManager {
  21  public:
  22   MIDIManagerMac();
  23   virtual ~MIDIManagerMac();
  24
  25   // MIDIManager implementation.
  26   virtual bool Initialize() OVERRIDE;
  27   virtual void SendMIDIData(MIDIManagerClient* client,
  28                             uint32 port_index,
  29                             const std::vector<uint8>& data,
  30                             double timestamp) OVERRIDE;
  31
  32  private:
  33   // CoreMIDI callback for MIDI data.
  34   // Each callback can contain multiple packets, each of which can contain
  35   // multiple MIDI messages.
  36   static void ReadMIDIDispatch(
  37       const MIDIPacketList *pktlist,
  38       void *read_proc_refcon,
  39       void *src_conn_refcon);
  40   virtual void ReadMIDI(MIDIEndpointRef source, const MIDIPacketList *pktlist);
  41
  42   // Helper
  43   static media::MIDIPortInfo GetPortInfoFromEndpoint(MIDIEndpointRef endpoint);
  44   static double MIDITimeStampToSeconds(MIDITimeStamp timestamp);
  45   static MIDITimeStamp SecondsToMIDITimeStamp(double seconds);
  46
  47   // CoreMIDI
  48   MIDIClientRef midi_client_;
  49   MIDIPortRef coremidi_input_;
  50   MIDIPortRef coremidi_output_;
  51
  52   enum{ kMaxPacketListSize = 512 };
  53   char midi_buffer_[kMaxPacketListSize];
  54   MIDIPacketList* packet_list_;
  55   MIDIPacket* midi_packet_;
  56
  57   typedef std::map<MIDIEndpointRef, uint32> SourceMap;
  58
  59   // Keeps track of the index (0-based) for each of our sources.
  60   SourceMap source_map_;
  61
  62   // Keeps track of all destinations.
  63   std::vector<MIDIEndpointRef> destinations_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(MIDIManagerMac);
  66 };
  67
  68 }  // namespace media
  69
  70 #endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_