// Copyright 2018 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 SERVICES_AUDIO_STREAM_MONITOR_H_ #define SERVICES_AUDIO_STREAM_MONITOR_H_ #include "base/unguessable_token.h" namespace audio { class Snoopable; class StreamMonitor { public: // Called when a stream in the group becomes active. virtual void OnStreamActive(Snoopable* snoopable) = 0; // Called when a stream in the group becomes inactive. virtual void OnStreamInactive(Snoopable* snoopable) = 0; protected: virtual ~StreamMonitor() = default; }; } // namespace audio #endif // SERVICES_AUDIO_STREAM_MONITOR_H_