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

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

Index: webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
index e55479551970e60e144e43e1a6e8a18c2087f579..106d14b986e4826434d1b31945da190fdb3d6828 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -660,6 +660,12 @@ int VP9EncoderImpl::GetEncodedLayerFrame(const vpx_codec_cx_pkt* pkt) {
   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);