Move VoiceEngineObserver into AudioSendStream so that we detect typing noises and return properly i…

webrtc/audio/voice_engines.h

+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_AUDIO_VOICE_ENGINES_H_
+#define WEBRTC_AUDIO_VOICE_ENGINES_H_
+
+#include <map>
+
+#include "webrtc/base/basictypes.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/thread_checker.h"
+
+namespace webrtc {
+
+class VoEBase;
+class VoiceEngine;
+
+namespace internal {
+
+class TypingNoiseObserver;
+
+// TODO(solenberg): Class comment + unit test.
+class VoiceEngines final {
+ public:
+  VoiceEngines();
+  ~VoiceEngines();
+  void RegisterVoiceEngine(VoiceEngine* voice_engine);
+  void DeregisterVoiceEngine(VoiceEngine* voice_engine);
+  bool GetTypingNoiseDetected(VoiceEngine* voice_engine) const;
+ private:
+  struct State {
+    // Need to keep a ref count so we know when to deregister the observer.
+    int32_t ref_count_ = 0;
+    // We hold one interface pointer to the VoE to make sure it is kept alive.
+    VoEBase* voe_base_ = nullptr;
+    TypingNoiseObserver* observer_ = nullptr;
+  };
+
+  rtc::ThreadChecker thread_checker_;
+  std::map<VoiceEngine*, State> voice_engines_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(VoiceEngines);
+};
+}  // namespace internal
+}  // namespace webrtc
+
+#endif  // WEBRTC_AUDIO_VOICE_ENGINES_H_