RtpFrameReferenceFinder VP8 reference calculation fix.

webrtc/modules/video_coding/rtp_frame_reference_finder.cc

 /*
  *  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 246 matching lines @@
 
   if (last_unwrap_ == -1)
     last_unwrap_ = codec_header.pictureId;
 
   if (last_picture_id_ == -1)
     last_picture_id_ = frame->picture_id;
 
   // Find if there has been a gap in fully received frames and save the picture
   // id of those frames in |not_yet_received_frames_|.
   if (AheadOf<uint16_t, kPicIdLength>(frame->picture_id, last_picture_id_)) {
-    last_picture_id_ = Add<kPicIdLength>(last_picture_id_, 1);
-    while (last_picture_id_ != frame->picture_id) {
+    do {
+      last_picture_id_ = Add<kPicIdLength>(last_picture_id_, 1);
       not_yet_received_frames_.insert(last_picture_id_);
-      last_picture_id_ = Add<kPicIdLength>(last_picture_id_, 1);
-    }
+    } while (last_picture_id_ != frame->picture_id);
   }
 
   // Clean up info for base layers that are too old.
   uint8_t old_tl0_pic_idx = codec_header.tl0PicIdx - kMaxLayerInfo;
   auto clean_layer_info_to = layer_info_.lower_bound(old_tl0_pic_idx);
   layer_info_.erase(layer_info_.begin(), clean_layer_info_to);
 
   // Clean up info about not yet received frames that are too old.
   uint16_t old_picture_id =
       Subtract<kPicIdLength>(frame->picture_id, kMaxNotYetReceivedFrames);
@@ skipping 465 matching lines @@
     if (!gof_info_.empty() &&
         AheadOf<uint8_t>(gof_info_.begin()->first, fixed_tl0)) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace video_coding
 }  // namespace webrtc