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

media/cast/sender/h264_vt_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/h264_vt_encoder.h"
 
 #include <string>
 #include <vector>
 
 #include "base/big_endian.h"
@@ skipping 343 matching lines @@
 
   // If the compression session exists, invalidate it. This blocks until all
   // pending output callbacks have returned and any internal threads have
   // joined, ensuring no output callback ever sees a dangling encoder pointer.
   if (compression_session_) {
     videotoolbox_glue_->VTCompressionSessionInvalidate(compression_session_);
     compression_session_.reset();
   }
 }
 
+bool H264VideoToolboxEncoder::CanEncodeVariedFrameSizes() const {
+  return false;
+}
+
 bool H264VideoToolboxEncoder::EncodeVideoFrame(
     const scoped_refptr<media::VideoFrame>& video_frame,
     const base::TimeTicks& reference_time,
     const FrameEncodedCallback& frame_encoded_callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!video_frame->visible_rect().IsEmpty());
   DCHECK(!frame_encoded_callback.is_null());
 
   if (!compression_session_) {
     DLOG(ERROR) << " compression session is null";
@@ skipping 159 matching lines @@
   CopySampleBufferToAnnexBBuffer(sbuf, &encoded_frame->data, keyframe);
 
   encoder->cast_environment_->PostTask(
       CastEnvironment::MAIN, FROM_HERE,
       base::Bind(request->frame_encoded_callback,
                  base::Passed(&encoded_frame)));
 }
 
 }  // namespace cast
 }  // namespace media