media/midi/midi_manager_alsa.h

   1 // Copyright 2014 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_ALSA_H_
   6 #define MEDIA_MIDI_MIDI_MANAGER_ALSA_H_
   7
   8 #include <alsa/asoundlib.h>
   9 #include <map>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/synchronization/lock.h"
  15 #include "base/threading/thread.h"
  16 #include "media/midi/midi_manager.h"
  17
  18 namespace media {
  19
  20 class MidiManagerAlsa : public MidiManager {
  21  public:
  22   MidiManagerAlsa();
  23   ~MidiManagerAlsa() override;
  24
  25   // MidiManager implementation.
  26   void StartInitialization() override;
  27   void DispatchSendMidiData(MidiManagerClient* client,
  28                             uint32 port_index,
  29                             const std::vector<uint8>& data,
  30                             double timestamp) override;
  31
  32  private:
  33   // An internal callback that runs on MidiSendThread.
  34   void SendMidiData(uint32 port_index,
  35                     const std::vector<uint8>& data);
  36
  37   void EventReset();
  38   void EventLoop();
  39
  40   // Alsa seq handles.
  41   snd_seq_t* in_client_;
  42   snd_seq_t* out_client_;
  43   int out_client_id_;
  44
  45   // One input port, many output ports.
  46   int in_port_;
  47   std::vector<int> out_ports_;
  48
  49   // Mapping from Alsa client:port to our index.
  50   typedef std::map<int, uint32> SourceMap;
  51   SourceMap source_map_;
  52
  53   // Alsa event <-> MIDI coders.
  54   snd_midi_event_t* decoder_;
  55   typedef std::vector<snd_midi_event_t*> EncoderList;
  56   EncoderList encoders_;
  57
  58   base::Thread send_thread_;
  59   base::Thread event_thread_;
  60
  61   bool event_thread_shutdown_; // guarded by shutdown_lock_
  62   base::Lock shutdown_lock_; // guards event_thread_shutdown_
  63
  64   DISALLOW_COPY_AND_ASSIGN(MidiManagerAlsa);
  65 };
  66
  67 }  // namespace media
  68
  69 #endif  // MEDIA_MIDI_MIDI_MANAGER_ALSA_H_