Work on flexible mode and screen sharing.

webrtc/modules/video_coding/main/source/generic_encoder.cc

Index: webrtc/modules/video_coding/main/source/generic_encoder.cc
diff --git a/webrtc/modules/video_coding/main/source/generic_encoder.cc b/webrtc/modules/video_coding/main/source/generic_encoder.cc
index e4408d1f7e7401f80da155124ff41351c7f7a2ee..4d303904a6046621e32751c911eaf08ca6208469 100644
--- a/webrtc/modules/video_coding/main/source/generic_encoder.cc
+++ b/webrtc/modules/video_coding/main/source/generic_encoder.cc
@@ -37,40 +37,38 @@ void CopyCodecSpecific(const CodecSpecificInfo* info, RTPVideoHeader* rtp) {
       return;
     }
     case kVideoCodecVP9: {
+      RTPVideoHeaderVP9& vp9toHdr = rtp->codecHeader.VP9;
+      const CodecSpecificInfoVP9& vp9fromHdr = info->codecSpecific.VP9;
+
       rtp->codec = kRtpVideoVp9;
-      rtp->codecHeader.VP9.InitRTPVideoHeaderVP9();
-      rtp->codecHeader.VP9.inter_pic_predicted =
-          info->codecSpecific.VP9.inter_pic_predicted;
-      rtp->codecHeader.VP9.flexible_mode =
-          info->codecSpecific.VP9.flexible_mode;
-      rtp->codecHeader.VP9.ss_data_available =
-          info->codecSpecific.VP9.ss_data_available;
-      rtp->codecHeader.VP9.picture_id = info->codecSpecific.VP9.picture_id;
-      rtp->codecHeader.VP9.tl0_pic_idx = info->codecSpecific.VP9.tl0_pic_idx;
-      rtp->codecHeader.VP9.temporal_idx = info->codecSpecific.VP9.temporal_idx;
-      rtp->codecHeader.VP9.spatial_idx = info->codecSpecific.VP9.spatial_idx;
-      rtp->codecHeader.VP9.temporal_up_switch =
-          info->codecSpecific.VP9.temporal_up_switch;
-      rtp->codecHeader.VP9.inter_layer_predicted =
-          info->codecSpecific.VP9.inter_layer_predicted;
-      rtp->codecHeader.VP9.gof_idx = info->codecSpecific.VP9.gof_idx;
-
-      // Packetizer needs to know the number of spatial layers to correctly set
-      // the marker bit, even when the number won't be written in the packet.
-      rtp->codecHeader.VP9.num_spatial_layers =
-          info->codecSpecific.VP9.num_spatial_layers;
-      if (info->codecSpecific.VP9.ss_data_available) {
-        rtp->codecHeader.VP9.spatial_layer_resolution_present =
-            info->codecSpecific.VP9.spatial_layer_resolution_present;
-        if (info->codecSpecific.VP9.spatial_layer_resolution_present) {
-          for (size_t i = 0; i < info->codecSpecific.VP9.num_spatial_layers;
-               ++i) {
-            rtp->codecHeader.VP9.width[i] = info->codecSpecific.VP9.width[i];
-            rtp->codecHeader.VP9.height[i] = info->codecSpecific.VP9.height[i];
+      vp9toHdr.InitRTPVideoHeaderVP9();
+      vp9toHdr.inter_pic_predicted = vp9fromHdr.inter_pic_predicted;
+      vp9toHdr.flexible_mode = vp9fromHdr.flexible_mode;
+      vp9toHdr.ss_data_available = vp9fromHdr.ss_data_available;
+      vp9toHdr.picture_id = vp9fromHdr.picture_id;
+      vp9toHdr.tl0_pic_idx = vp9fromHdr.tl0_pic_idx;
+      vp9toHdr.temporal_idx = vp9fromHdr.temporal_idx;
+      vp9toHdr.spatial_idx = vp9fromHdr.spatial_idx;
+      vp9toHdr.temporal_up_switch = vp9fromHdr.temporal_up_switch;
+      vp9toHdr.inter_layer_predicted = vp9fromHdr.inter_layer_predicted;
+      vp9toHdr.gof_idx = vp9fromHdr.gof_idx;
+      vp9toHdr.num_spatial_layers = vp9fromHdr.num_spatial_layers;
+
+      if (vp9fromHdr.ss_data_available) {
+        vp9toHdr.spatial_layer_resolution_present =
+            vp9fromHdr.spatial_layer_resolution_present;
+        if (vp9fromHdr.spatial_layer_resolution_present) {
+          for (size_t i = 0; i < vp9fromHdr.num_spatial_layers; ++i) {
+            vp9toHdr.width[i] = vp9fromHdr.width[i];
+            vp9toHdr.height[i] = vp9fromHdr.height[i];
           }
         }
-        rtp->codecHeader.VP9.gof.CopyGofInfoVP9(info->codecSpecific.VP9.gof);
+        vp9toHdr.gof.CopyGofInfoVP9(vp9fromHdr.gof);
       }
+
+      vp9toHdr.num_ref_pics = vp9fromHdr.num_ref_pics;
+      for (int i = 0; i < vp9fromHdr.num_ref_pics; ++i)
+        vp9toHdr.pid_diff[i] = vp9fromHdr.p_diff[i];
       return;
     }
     case kVideoCodecH264: