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