Add QP sum stats for received streams.

webrtc/video_decoder.h

 /*
  *  Copyright (c) 2014 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 17 matching lines @@
 
 class DecodedImageCallback {
  public:
   virtual ~DecodedImageCallback() {}
 
   virtual int32_t Decoded(VideoFrame& decodedImage) = 0;
   // Provides an alternative interface that allows the decoder to specify the
   // decode time excluding waiting time for any previous pending frame to
   // return. This is necessary for breaking positive feedback in the delay
   // estimation when the decoder has a single output buffer.
-  // TODO(perkj): Remove default implementation when chromium has been updated.
   virtual int32_t Decoded(VideoFrame& decodedImage, int64_t decode_time_ms) {
     // The default implementation ignores custom decode time value.
     return Decoded(decodedImage);
   }
+  // TODO(sakal): Remove other implementations when upstream projects have been
+  // updated.
+  virtual int32_t Decoded(VideoFrame& decodedImage,

[stefan-webrtc, 2017/02/07 09:56:51]

Would it be a good idea to update the return type to int (or perhaps even bool?)
while we're at it?

[sakal, 2017/02/07 12:28:18]

I removed the return value completely since we always returned OK anyway.

+                          rtc::Optional<int32_t> decode_time_ms,
+                          rtc::Optional<uint8_t> qp) {
+    return Decoded(decodedImage,
+                   decode_time_ms ? static_cast<int32_t>(*decode_time_ms) : -1);
+  }
 
   virtual int32_t ReceivedDecodedReferenceFrame(const uint64_t pictureId) {
     return -1;
   }
 
   virtual int32_t ReceivedDecodedFrame(const uint64_t pictureId) { return -1; }
 };
 
 class VideoDecoder {
  public:
@@ skipping 17 matching lines @@
   // That is, it can not decode infinite number of frames before the decoded
   // frame is consumed.
   virtual bool PrefersLateDecoding() const { return true; }
 
   virtual const char* ImplementationName() const { return "unknown"; }
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_DECODER_H_