libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_decoder.c

Index: source/libvpx/vp9/decoder/vp9_decoder.c
===================================================================
--- source/libvpx/vp9/decoder/vp9_decoder.c	(revision 282873)
+++ source/libvpx/vp9/decoder/vp9_decoder.c	(working copy)
@@ -85,7 +85,6 @@
   VP9_COMMON *const cm = &pbi->common;
   int i;
 
-  vp9_remove_common(cm);
   vp9_get_worker_interface()->end(&pbi->lf_worker);
   vpx_free(pbi->lf_worker.data1);
   vpx_free(pbi->tile_data);
@@ -103,6 +102,7 @@
     vp9_loop_filter_dealloc(&pbi->lf_row_sync, sb_rows);
   }
 
+  vp9_remove_common(cm);
   vpx_free(pbi);
 }
 
@@ -246,6 +246,7 @@
 
   if (setjmp(cm->error.jmp)) {
     cm->error.setjmp = 0;
+    vp9_clear_system_state();
 
     // We do not know if the missing frame(s) was supposed to update
     // any of the reference buffers, but we act conservative and
@@ -267,7 +268,10 @@
 
   vp9_decode_frame(pbi, source, source + size, psource);
 
-  swap_frame_buffers(pbi);
+  if (!cm->show_existing_frame)
+    swap_frame_buffers(pbi);
+  else
+    cm->frame_to_show = get_frame_new_buffer(cm);
 
   vp9_clear_system_state();
 
@@ -291,6 +295,7 @@
 
 int vp9_get_raw_frame(VP9Decoder *pbi, YV12_BUFFER_CONFIG *sd,
                       vp9_ppflags_t *flags) {
+  VP9_COMMON *const cm = &pbi->common;
   int ret = -1;
 #if !CONFIG_VP9_POSTPROC
   (void)*flags;
@@ -300,15 +305,20 @@
     return ret;
 
   /* no raw frame to show!!! */
-  if (pbi->common.show_frame == 0)
+  if (!cm->show_frame)
     return ret;
 
   pbi->ready_for_new_data = 1;
 
 #if CONFIG_VP9_POSTPROC
-  ret = vp9_post_proc_frame(&pbi->common, sd, flags);
+  if (!cm->show_existing_frame) {
+    ret = vp9_post_proc_frame(cm, sd, flags);
+  } else {
+    *sd = *cm->frame_to_show;
+    ret = 0;
+  }
 #else
-  *sd = *pbi->common.frame_to_show;
+  *sd = *cm->frame_to_show;
   ret = 0;
 #endif /*!CONFIG_POSTPROC*/
   vp9_clear_system_state();