Reallocate encoded buffer size if needed. Initially set to the input image size.

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

 /*
  *  Copyright (c) 2014 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 642 matching lines @@
 int VP9EncoderImpl::GetEncodedLayerFrame(const vpx_codec_cx_pkt* pkt) {
   encoded_image_._length = 0;
   encoded_image_._frameType = kVideoFrameDelta;
   RTPFragmentationHeader frag_info;
   // Note: no data partitioning in VP9, so 1 partition only. We keep this
   // fragmentation data for now, until VP9 packetizer is implemented.
   frag_info.VerifyAndAllocateFragmentationHeader(1);
   int part_idx = 0;
   CodecSpecificInfo codec_specific;
 
+  if (pkt->data.frame.sz > encoded_image_._size) {
+    delete[] encoded_image_._buffer;
+    encoded_image_._size = pkt->data.frame.sz;
+    encoded_image_._buffer = new uint8_t[encoded_image_._size];

[stefan-webrtc, 2016/01/20 12:39:07]

Don't you have to copy the existing content of the old buffer into the new
buffer? At least that's what line 670 seems to indicate? You should probably
also change 663 to 
if (encoded_image_._length + pkt->data.frame.sz > encoded_iamge_._size) {

Similarly on line 666.

Or is line 670 incorrect?

[åsapersson, 2016/01/20 13:32:00]

It is only copied once right (line 670).

encoded_image_._length is 0. Change this in another cl?

[stefan-webrtc, 2016/01/20 14:11:02]

Sure, if you prefer. Although it should as far as I can tell be enough to just
change &encoded_image_._buffer[encoded_image_._length] to encoded_image_._buffer
below, right?

+  }
+
   assert(pkt->kind == VPX_CODEC_CX_FRAME_PKT);
   memcpy(&encoded_image_._buffer[encoded_image_._length], pkt->data.frame.buf,
          pkt->data.frame.sz);
   frag_info.fragmentationOffset[part_idx] = encoded_image_._length;
   frag_info.fragmentationLength[part_idx] =
       static_cast<uint32_t>(pkt->data.frame.sz);
   frag_info.fragmentationPlType[part_idx] = 0;
   frag_info.fragmentationTimeDiff[part_idx] = 0;
   encoded_image_._length += static_cast<uint32_t>(pkt->data.frame.sz);
 
@@ skipping 309 matching lines @@
   frame_buffer_pool_.ClearPool();
   inited_ = false;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 const char* VP9DecoderImpl::ImplementationName() const {
   return "libvpx";
 }
 
 }  // namespace webrtc