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| 1 // Copyright 2017 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 CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ |
| 6 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ |
| 7 |
| 8 #include <memory> |
| 9 #include <vector> |
| 10 |
| 11 #include "base/callback.h" |
| 12 #include "chrome/browser/media/router/media_sink.h" |
| 13 |
| 14 namespace media_router { |
| 15 |
| 16 class MediaSinksObserver; |
| 17 |
| 18 // A service which can be used to start background discovery and resolution of |
| 19 // MediaSinks. Often these are remote devices, like Chromecast. In addition, the |
| 20 // service is capable of answering MediaSink queries using the sinks that it |
| 21 // generated. |
| 22 // This class is not thread safe. All methods must be called from the IO thread. |
| 23 class MediaSinkService { |
| 24 public: |
| 25 // Callback to be invoked when this class finishes sink discovering. |
| 26 // Arg 0: Sinks discovered and resolved by the service. |
| 27 using OnSinksDiscoveredCallback = |
| 28 base::Callback<void(const std::vector<MediaSink>&)>; |
| 29 |
| 30 explicit MediaSinkService( |
| 31 const OnSinksDiscoveredCallback& sinks_discovered_callback); |
| 32 |
| 33 virtual ~MediaSinkService(); |
| 34 |
| 35 // Starts sink discovery. No-ops if already started. |
| 36 // Sinks discovered and resolved are continuously passed to |
| 37 // |callback|. |
| 38 virtual void Start() = 0; |
| 39 |
| 40 // Adds a sink query to observe for MediaSink updates. |
| 41 // Multiple observers can be added for a given MediaSource. |
| 42 // Start() must be called first. This class does not take |
| 43 // ownership of |observer|. |
| 44 virtual void AddSinkQuery(MediaSinksObserver* observer) = 0; |
| 45 |
| 46 // Removes a sink query and stops observing MediaSink updates. No-op if |
| 47 // |observer| is not registered with this class. |
| 48 virtual void RemoveSinkQuery(MediaSinksObserver* observer) = 0; |
| 49 |
| 50 protected: |
| 51 OnSinksDiscoveredCallback sinks_discovered_callback_; |
| 52 |
| 53 DISALLOW_COPY_AND_ASSIGN(MediaSinkService); |
| 54 }; |
| 55 |
| 56 } // namespace media_router |
| 57 |
| 58 #endif // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_SERVICE_H_ |
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