svc: Fix a case where target bandwidth is 0

Bug: webrtc:15033
Change-Id: Iea2997c2ce8982f106a1eed3ec4f7dd1c6e83666

diff --git a/vp9/encoder/vp9_svc_layercontext.c b/vp9/encoder/vp9_svc_layercontext.c
index ac8b09c..83b6e5c 100644 (file)
--- a/vp9/encoder/vp9_svc_layercontext.c
+++ b/vp9/encoder/vp9_svc_layercontext.c
@@ -254,7 +254,9 @@ void vp9_update_layer_context_change_config(VP9_COMP *const cpi,
 
       lc->target_bandwidth = oxcf->layer_target_bitrate[layer];
 
-      bitrate_alloc = (float)lc->target_bandwidth / target_bandwidth;
+      if (target_bandwidth != 0) {
+        bitrate_alloc = (float)lc->target_bandwidth / target_bandwidth;
+      }
       // Update buffer-related quantities.
       lrc->starting_buffer_level =
           (int64_t)(rc->starting_buffer_level * bitrate_alloc);