Add test for verifying configured key frame interval for VP9.

webrtc/video/video_send_stream_tests.cc

 /*
  *  Copyright (c) 2013 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 <algorithm>  // max
@@ skipping 1886 matching lines @@
  protected:
   bool ContinuousPictureId(const RTPVideoHeaderVP9& vp9) const {
     if (last_vp9_.picture_id > vp9.picture_id) {
       return vp9.picture_id == 0;  // Wrap.
     } else {
       return vp9.picture_id == last_vp9_.picture_id + 1;
     }
   }
 
   void VerifySpatialIdxWithinFrame(const RTPVideoHeaderVP9& vp9) const {
-    if (frames_sent_ == 0)
-      return;
-
     bool new_layer = vp9.spatial_idx != last_vp9_.spatial_idx;
     EXPECT_EQ(new_layer, vp9.beginning_of_frame);
     EXPECT_EQ(new_layer, last_vp9_.end_of_frame);
     EXPECT_EQ(new_layer ? last_vp9_.spatial_idx + 1 : last_vp9_.spatial_idx,
               vp9.spatial_idx);
   }
 
   void VerifyFixedTemporalLayerStructure(const RTPVideoHeaderVP9& vp9,
                                          uint8_t num_layers) const {
     switch (num_layers) {
@@ skipping 233 matching lines @@
       vp9_settings_.keyFrameInterval = kKeyFrameInterval;
       vp9_settings_.numberOfTemporalLayers = num_temporal_layers_;
       vp9_settings_.numberOfSpatialLayers = num_spatial_layers_;
     }
 
     void InspectHeader(const RTPVideoHeaderVP9& vp9) override {
       bool ss_data_expected = !vp9.inter_pic_predicted &&
                               vp9.beginning_of_frame && vp9.spatial_idx == 0;
       EXPECT_EQ(ss_data_expected, vp9.ss_data_available);
       EXPECT_EQ(vp9.spatial_idx > 0, vp9.inter_layer_predicted);  // D
+      EXPECT_EQ(!vp9.inter_pic_predicted,
+                frames_sent_ % kKeyFrameInterval == 0);
 
       if (IsNewPictureId(vp9)) {
         EXPECT_EQ(0, vp9.spatial_idx);
         EXPECT_EQ(num_spatial_layers_ - 1, last_vp9_.spatial_idx);
       }
 
       VerifyFixedTemporalLayerStructure(vp9,
                                         l_field_ ? num_temporal_layers_ : 0);
 
       if (frames_sent_ > kNumFramesToSend)
@@ skipping 26 matching lines @@
         EXPECT_GT(vp9_header.num_ref_pics, 0u);
         observation_complete_.Set();
       }
     }
   } test;
 
   RunBaseTest(&test, FakeNetworkPipe::Config());
 }
 
 }  // namespace webrtc