H264 encoder: Include QP information in encoded images

webrtc/sdk/objc/Framework/Classes/h264_video_toolbox_encoder.mm

 /*
  *  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.
  *
  */
@@ skipping 628 matching lines @@
       is_keyframe ? webrtc::kVideoFrameKey : webrtc::kVideoFrameDelta;
   frame.capture_time_ms_ = render_time_ms;
   frame._timeStamp = timestamp;
   frame.rotation_ = rotation;
 
   h264_bitstream_parser_.ParseBitstream(buffer->data(), buffer->size());
   int qp;
   if (h264_bitstream_parser_.GetLastSliceQp(&qp)) {
     rtc::CritScope lock(&quality_scaler_crit_);
     quality_scaler_.ReportQP(qp);
+    frame.qp_ = qp;
   }
 
   EncodedImageCallback::Result result =
       callback_->OnEncodedImage(frame, &codec_specific_info, header.get());
   if (result.error != EncodedImageCallback::Result::OK) {
     LOG(LS_ERROR) << "Encode callback failed: " << result.error;
     return;
   }
   bitrate_adjuster_.Update(frame._size);
 }
 
 }  // namespace webrtc