Work on flexible mode and screen sharing.

webrtc/video/video_send_stream.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.
  */
 
@@ skipping 328 matching lines @@
       video_codec.codecSpecific.VP8 = *reinterpret_cast<const VideoCodecVP8*>(
                                           config.encoder_specific_settings);
     }
     video_codec.codecSpecific.VP8.numberOfTemporalLayers =
         static_cast<unsigned char>(
             streams.back().temporal_layer_thresholds_bps.size() + 1);
   } else if (video_codec.codecType == kVideoCodecVP9) {
     if (config.encoder_specific_settings != nullptr) {
       video_codec.codecSpecific.VP9 = *reinterpret_cast<const VideoCodecVP9*>(
                                           config.encoder_specific_settings);
+      if (video_codec.mode == kScreensharing) {
+        video_codec.codecSpecific.VP9.flexibleMode = true;
+        // For now VP9 screensharing use 1 temporal and 2 spatial layers.
+        RTC_DCHECK_EQ(video_codec.codecSpecific.VP9.numberOfTemporalLayers, 1);
+        RTC_DCHECK_EQ(video_codec.codecSpecific.VP9.numberOfSpatialLayers, 2);
+      }
     }
     video_codec.codecSpecific.VP9.numberOfTemporalLayers =
         static_cast<unsigned char>(
             streams.back().temporal_layer_thresholds_bps.size() + 1);
   } else if (video_codec.codecType == kVideoCodecH264) {
     if (config.encoder_specific_settings != nullptr) {
       video_codec.codecSpecific.H264 = *reinterpret_cast<const VideoCodecH264*>(
                                            config.encoder_specific_settings);
     }
   } else {
@@ skipping 207 matching lines @@
                                        vie_channel_->IsSendingFecEnabled());
 
   // Restart the media flow
   vie_encoder_->Restart();
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace webrtc