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

webrtc/audio/typing_noise_observer.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_TYPING_NOISE_OBSERVER_H_
+#define WEBRTC_AUDIO_TYPING_NOISE_OBSERVER_H_
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/voice_engine/include/voe_base.h"
+
+namespace webrtc {
+namespace internal {
+
+// TODO(solenberg): Class comment + unit test.
+class TypingNoiseObserver final : public webrtc::VoiceEngineObserver {
+ public:
+  TypingNoiseObserver() {}
+
+  bool typing_noise_detected() const { return typing_noise_detected_; }
+
+ private:
+  // webrtc::VoiceEngineObserver implementation.
+  void CallbackOnError(int channel_id, int err_code) override;
+
+  // TODO(solenberg): I don't actually think it is worth adding a crit sect in
+  //                  this case, but reviewer may think differently...
+  // rtc::CriticalSection crit_sect_;
+  volatile bool typing_noise_detected_ = false;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(TypingNoiseObserver);
+};
+}  // namespace internal
+}  // namespace webrtc
+
+#endif  // WEBRTC_AUDIO_TYPING_NOISE_OBSERVER_H_