1 // Copyright (c) 2012 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 CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_ 6 #define CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_ 7 8 #include <vector> 9 10 #include "base/time/time.h" 11 #include "content/common/content_export.h" 12 #include "media/base/media_log.h" 13 14 namespace base { 15 class MessageLoopProxy; 16 } 17 18 namespace content { 19 20 // RenderMediaLog is an implementation of MediaLog that forwards events to the 21 // browser process, throttling as necessary. 22 // 23 // To minimize the number of events sent over the wire, only the latest event 24 // added is sent for high frequency events (e.g., BUFFERED_EXTENTS_CHANGED). 25 class CONTENT_EXPORT RenderMediaLog : public media::MediaLog { 26 public: 27 RenderMediaLog(); 28 29 // MediaLog implementation. 30 virtual void AddEvent(scoped_ptr<media::MediaLogEvent> event) OVERRIDE; 31 32 // Will reset |last_ipc_send_time_| with the value of NowTicks(). 33 void SetTickClockForTesting(scoped_ptr<base::TickClock> tick_clock); 34 35 private: 36 virtual ~RenderMediaLog(); 37 38 scoped_refptr<base::MessageLoopProxy> render_loop_; 39 scoped_ptr<base::TickClock> tick_clock_; 40 base::TimeTicks last_ipc_send_time_; 41 std::vector<media::MediaLogEvent> queued_media_events_; 42 43 // Limits the number buffered extents changed events we send over IPC to one. 44 scoped_ptr<media::MediaLogEvent> last_buffered_extents_changed_event_; 45 46 DISALLOW_COPY_AND_ASSIGN(RenderMediaLog); 47 }; 48 49 } // namespace content 50 51 #endif // CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_ 52