Add stats for average QP per frame for VP8 (for received video streams).

webrtc/modules/video_coding/utility/qp_parser.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
-#include "webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h"
+#include "webrtc/modules/video_coding/utility/include/qp_parser.h"
+
+#include "webrtc/common_types.h"
+#include "webrtc/modules/video_coding/utility/include/vp8_header_parser.h"
 
 namespace webrtc {
 
-LockedIsacBandwidthInfo::LockedIsacBandwidthInfo()
-      : lock_(CriticalSectionWrapper::CreateCriticalSection()) {
-  bwinfo_.in_use = 0;
+bool QpParser::GetQp(const VCMEncodedFrame& frame, int* qp) {
+  switch (frame.CodecSpecific()->codecType) {
+    case kVideoCodecVP8:
+      // QP range: [0, 127].
+      return vp8::GetQp(frame.Buffer(), frame.Length(), qp);
+    default:
+      return false;
+  }
 }
 
-LockedIsacBandwidthInfo::~LockedIsacBandwidthInfo() = default;
-
 }  // namespace webrtc