Fix two uninitialized variables in media

media/filters/stream_parser_factory.cc

 // Copyright (c) 2013 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.
 
 #include "media/filters/stream_parser_factory.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 81 matching lines @@
   NULL
 };
 
 static StreamParser* BuildWebMParser(
     const std::vector<std::string>& codecs,
     const LogCB& log_cb) {
   return new WebMStreamParser();
 }
 
 #if defined(USE_PROPRIETARY_CODECS)
+static const int kNullObjectType = 0;
 // AAC Object Type IDs that Chrome supports.
 static const int kAACLCObjectType = 2;
 static const int kAACSBRObjectType = 5;
 
 static int GetMP4AudioObjectType(const std::string& codec_id,
                                  const LogCB& log_cb) {
-  int audio_object_type;
+  int audio_object_type = kNullObjectType;
   std::vector<std::string> tokens;
   if (Tokenize(codec_id, ".", &tokens) != 3 ||
       tokens[0] != "mp4a" || tokens[1] != "40" ||
       !base::HexStringToInt(tokens[2], &audio_object_type)) {

[Peter Kasting, 2014/07/26 00:45:33]

Note: You _might_ be able to get rid of the warning by reversing all these
conditions so the "return audio_object_type" is the conditional body, instead of
defining kNullObjectType.  MSVC is weird that way.

     MEDIA_LOG(log_cb) << "Malformed mimetype codec '" << codec_id << "'";
     return -1;
   }
 
 
   return audio_object_type;
 }
 
 bool ValidateMP4ACodecID(const std::string& codec_id, const LogCB& log_cb) {
   int audio_object_type = GetMP4AudioObjectType(codec_id, log_cb);
@@ skipping 283 matching lines @@
                                 CodecInfo::HISTOGRAM_MAX + 1);
     }
 
     stream_parser.reset(factory_function(codecs, log_cb));
   }
 
   return stream_parser.Pass();
 }
 
 }  // namespace media