[Cast] Software encoder support for varying video frame sizes.

media/cast/sender/fake_software_video_encoder.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/sender/fake_software_video_encoder.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "media/base/video_frame.h"
 #include "media/cast/net/cast_transport_config.h"
@@ skipping 15 matching lines @@
 FakeSoftwareVideoEncoder::~FakeSoftwareVideoEncoder() {}
 
 void FakeSoftwareVideoEncoder::Initialize() {}
 
 void FakeSoftwareVideoEncoder::Encode(
     const scoped_refptr<media::VideoFrame>& video_frame,
     const base::TimeTicks& reference_time,
     EncodedFrame* encoded_frame) {
   DCHECK(encoded_frame);
 
+  if (video_frame->visible_rect().size() != last_frame_size_) {
+    next_frame_is_key_ = true;
+    last_frame_size_ = video_frame->visible_rect().size();
+  }
+
   encoded_frame->frame_id = frame_id_++;
   if (next_frame_is_key_) {
     encoded_frame->dependency = EncodedFrame::KEY;
     encoded_frame->referenced_frame_id = encoded_frame->frame_id;
     next_frame_is_key_ = false;
   } else {
     encoded_frame->dependency = EncodedFrame::DEPENDENT;
     encoded_frame->referenced_frame_id = encoded_frame->frame_id - 1;
   }
   encoded_frame->rtp_timestamp =
@@ skipping 20 matching lines @@
 }
 
 void FakeSoftwareVideoEncoder::LatestFrameIdToReference(uint32 frame_id) {
   frame_id_to_reference_ = frame_id;
 }
 
 }  // namespace cast
 }  // namespace media
 
 #endif