Request keyframes more frequently on stream start/decoding error.

webrtc/modules/video_coding/frame_buffer2.h

 /*
  *  Copyright (c) 2016 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.
  */
 
@@ skipping 39 matching lines @@
   int InsertFrame(std::unique_ptr<FrameObject> frame);
 
   // Get the next frame for decoding. Will return at latest after
   // |max_wait_time_ms|.
   //  - If a frame is available within |max_wait_time_ms| it will return
   //    kFrameFound and set |frame_out| to the resulting frame.
   //  - If no frame is available after |max_wait_time_ms| it will return
   //    kTimeout.
   //  - If the FrameBuffer is stopped then it will return kStopped.
   ReturnReason NextFrame(int64_t max_wait_time_ms,
-                         std::unique_ptr<FrameObject>* frame_out);
+                         std::unique_ptr<FrameObject>* frame_out,
+                         bool keyframe_required = false);
 
   // Tells the FrameBuffer which protection mode that is in use. Affects
   // the frame timing.
   // TODO(philipel): Remove this when new timing calculations has been
   //                 implemented.
   void SetProtectionMode(VCMVideoProtection mode);
 
   // Start the frame buffer, has no effect if the frame buffer is started.
   // The frame buffer is started upon construction.
   void Start();
@@ skipping 108 matching lines @@
   VCMReceiveStatisticsCallback* const stats_callback_;
   int64_t last_log_non_decoded_ms_ GUARDED_BY(crit_);
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FrameBuffer);
 };
 
 }  // namespace video_coding
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_FRAME_BUFFER2_H_