Add unit tests for qp parser.

webrtc/modules/video_coding/codecs/vp9/test/vp9_impl_unittest.cc

 /*
  *  Copyright (c) 2017 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 86 matching lines @@
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
             decoder_->Decode(encoded_frame, false, nullptr));
   std::unique_ptr<VideoFrame> decoded_frame;
   rtc::Optional<uint8_t> decoded_qp;
   ASSERT_TRUE(WaitForDecodedFrame(&decoded_frame, &decoded_qp));
   ASSERT_TRUE(decoded_frame);
   ASSERT_TRUE(decoded_qp);
   EXPECT_EQ(encoded_frame.qp_, *decoded_qp);
 }
 
+TEST_F(TestVp9Impl, ParserQpEqualsEncodedQp) {
+  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
+            encoder_->Encode(*input_frame_, nullptr, nullptr));
+  EncodedImage encoded_frame;
+  CodecSpecificInfo codec_specific_info;
+  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
+
+  int qp = 0;
+  ASSERT_TRUE(vp9::GetQp(encoded_frame._buffer, encoded_frame._length, &qp));
+
+  EXPECT_EQ(encoded_frame.qp_, qp);
+}
+
 TEST_F(TestVp9Impl, EncoderRetainsRtpStateAfterRelease) {
   // Override default settings.
   codec_settings_.VP9()->numberOfTemporalLayers = 2;
   // Tl0PidIdx is only used in non-flexible mode.
   codec_settings_.VP9()->flexibleMode = false;
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
             encoder_->InitEncode(&codec_settings_, 1 /* number of cores */,
                                  0 /* max payload size (unused) */));
 
   // Temporal layer 0.
@@ skipping 62 matching lines @@
   // Temporal layer 1.
   input_frame_->set_timestamp(input_frame_->timestamp() +
                               kTimestampIncrementPerFrame);
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
             encoder_->Encode(*input_frame_, nullptr, nullptr));
   ExpectFrameWith((picture_id + 7) % (1 << 15), (tl0_pic_idx + 3) % (1 << 8),
                   1);
 }
 
 }  // namespace webrtc