Add QP for libvpx VP8 decoder.

webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc

 /*
  *  Copyright (c) 2012 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 1127 matching lines @@
   if (vpx_codec_decode(decoder_, buffer, input_image._length, 0,
                        VPX_DL_REALTIME)) {
     // Reset to avoid requesting key frames too often.
     if (propagation_cnt_ > 0) {
       propagation_cnt_ = 0;
     }
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
   img = vpx_codec_get_frame(decoder_, &iter);
-  ret = ReturnFrame(img, input_image._timeStamp, input_image.ntp_time_ms_);
+  int qp;
+  vpx_codec_control(decoder_, VPXD_GET_LAST_QUANTIZER, &qp);

[sakal, 2017/02/16 12:44:49]

This method can return failure in theory. However, in practice it only happens
if it is not supplied a valid int pointer. I would prefer not adding dead code
for handling this. WDYT?

+  ret = ReturnFrame(img, input_image._timeStamp, input_image.ntp_time_ms_, qp);
   if (ret != 0) {
     // Reset to avoid requesting key frames too often.
     if (ret < 0 && propagation_cnt_ > 0)
       propagation_cnt_ = 0;
     return ret;
   }
   if (feedback_mode_) {
     // Whenever we receive an incomplete key frame all reference buffers will
     // be corrupt. If that happens we must request new key frames until we
     // decode a complete key frame.
@@ skipping 39 matching lines @@
   if (propagation_cnt_ > kVp8ErrorPropagationTh) {
     // Reset to avoid requesting key frames too often.
     propagation_cnt_ = 0;
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int VP8DecoderImpl::ReturnFrame(const vpx_image_t* img,
                                 uint32_t timestamp,
-                                int64_t ntp_time_ms) {
+                                int64_t ntp_time_ms,
+                                int qp) {
   if (img == NULL) {
     // Decoder OK and NULL image => No show frame
     return WEBRTC_VIDEO_CODEC_NO_OUTPUT;
   }
   last_frame_width_ = img->d_w;
   last_frame_height_ = img->d_h;
   // Allocate memory for decoded image.
   rtc::scoped_refptr<I420Buffer> buffer =
       buffer_pool_.CreateBuffer(img->d_w, img->d_h);
   if (!buffer.get()) {
     // Pool has too many pending frames.
     RTC_HISTOGRAM_BOOLEAN("WebRTC.Video.VP8DecoderImpl.TooManyPendingFrames",
                           1);
     return WEBRTC_VIDEO_CODEC_NO_OUTPUT;
   }
 
   libyuv::I420Copy(img->planes[VPX_PLANE_Y], img->stride[VPX_PLANE_Y],
                    img->planes[VPX_PLANE_U], img->stride[VPX_PLANE_U],
                    img->planes[VPX_PLANE_V], img->stride[VPX_PLANE_V],
                    buffer->MutableDataY(), buffer->StrideY(),
                    buffer->MutableDataU(), buffer->StrideU(),
                    buffer->MutableDataV(), buffer->StrideV(),
                    img->d_w, img->d_h);
 
   VideoFrame decoded_image(buffer, timestamp, 0, kVideoRotation_0);
   decoded_image.set_ntp_time_ms(ntp_time_ms);
-  int ret = decode_complete_callback_->Decoded(decoded_image);
-  if (ret != 0)
-    return ret;
+  decode_complete_callback_->Decoded(decoded_image, rtc::Optional<int32_t>(),
+                                     rtc::Optional<uint8_t>(qp));
 
   // Remember image format for later
   image_format_ = img->fmt;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int VP8DecoderImpl::RegisterDecodeCompleteCallback(
     DecodedImageCallback* callback) {
   decode_complete_callback_ = callback;
   return WEBRTC_VIDEO_CODEC_OK;
@@ skipping 29 matching lines @@
     return -1;
   }
   if (vpx_codec_control(copy->decoder_, VP8_SET_REFERENCE, ref_frame_) !=
       VPX_CODEC_OK) {
     return -1;
   }
   return 0;
 }
 
 }  // namespace webrtc