Web MIDI API back-end (work-in-progress)

media/midi/midi_manager_mac.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_MIDI_MIDI_MANAGER_MAC_H_
+#define MEDIA_MIDI_MIDI_MANAGER_MAC_H_
+
+#include <CoreMIDI/MIDIServices.h>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "media/midi/midi_manager.h"
+#include <map>
+
+namespace media {
+
+class MEDIA_EXPORT MIDIManagerMac : public MIDIManager {
+ public:
+  MIDIManagerMac();
+  virtual ~MIDIManagerMac();
+
+  virtual void SendMIDI(UInt8 *midi_data,
+                        UInt32 length,
+                        MIDITimeStamp timestamp);
+
+ private:
+        static void ReadMidiDispatch(const MIDIPacketList *pktlist,

[scherkus (not reviewing), 2013/06/03 22:44:59]

may want to mention from apple docs that these procs are "called on a separate
high-priority thread owned by CoreMIDI."

+                                     void *read_proc_refcon,
+                                     void *src_conn_refcon);
+        virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList *pktlist);
+
+  // Helper
+  static double MIDITimeStampToSeconds(MIDITimeStamp timestamp);
+  static MIDITimeStamp SecondsToMIDITimeStamp(double seconds);
+  CFStringRef GetDeviceNameFromEndpoint(MIDIEndpointRef endpoint);
+
+        // CoreMIDI
+        MIDIClientRef midi_client_;
+        MIDIPortRef input_port_;
+        MIDIPortRef output_port_;
+        MIDIEndpointRef destination_;
+
+        enum{ kMaxPacketListSize = 512 };
+        char mMIDIBuffer[kMaxPacketListSize];
+        MIDIPacketList* packet_list_;
+        MIDIPacket* midi_packet_;
+        
+  typedef std::map<MIDIEndpointRef, int> SourceMap;
+  SourceMap source_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MIDIManagerMac);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_