Vp8Parser: Zero-initialize segment feature data when required

media/filters/vp8_parser.cc

 // Copyright 2015 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.
 //
 // This file contains an implementation of a VP8 raw stream parser,
 // as defined in RFC 6386.
 
 #include "base/logging.h"
 #include "media/filters/vp8_parser.h"
 
@@ skipping 224 matching lines @@
     int mode;
     BD_READ_UNSIGNED_OR_RETURN(1, &mode);
     shdr->segment_feature_mode =
         static_cast<Vp8SegmentationHeader::SegmentFeatureMode>(mode);
 
     for (size_t i = 0; i < kMaxMBSegments; ++i) {
       bool quantizer_update;
       BD_READ_BOOL_OR_RETURN(&quantizer_update);
       if (quantizer_update)
         BD_READ_SIGNED_OR_RETURN(7, &shdr->quantizer_update_value[i]);
+      else
+        shdr->quantizer_update_value[i] = 0;
     }
 
     for (size_t i = 0; i < kMaxMBSegments; ++i) {
       bool loop_filter_update;
       BD_READ_BOOL_OR_RETURN(&loop_filter_update);
       if (loop_filter_update)
         BD_READ_SIGNED_OR_RETURN(6, &shdr->lf_update_value[i]);
+      else
+        shdr->lf_update_value[i] = 0;
     }
   }
 
   if (shdr->update_mb_segmentation_map) {
     for (size_t i = 0; i < kNumMBFeatureTreeProbs; ++i) {
       bool segment_prob_update;
       BD_READ_BOOL_OR_RETURN(&segment_prob_update);
       if (segment_prob_update)
         BD_READ_UNSIGNED_OR_RETURN(8, &shdr->segment_prob[i]);
       else
@@ skipping 601 matching lines @@
   fhdr->dct_partition_sizes[fhdr->num_of_dct_partitions - 1] = bytes_left;
 
   DVLOG(4) << "Control part size: " << fhdr->first_part_size;
   for (size_t i = 0; i < fhdr->num_of_dct_partitions; ++i)
     DVLOG(4) << "DCT part " << i << " size: " << fhdr->dct_partition_sizes[i];
 
   return true;
 }
 
 }  // namespace media