Fix: Adding list of supported codecs for MP4 containers

base/strings/string_util.h

 // Copyright 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.
 //
 // This file defines utility functions for working with strings.
 
 #ifndef BASE_STRINGS_STRING_UTIL_H_
 #define BASE_STRINGS_STRING_UTIL_H_
 
 #include <ctype.h>
@@ skipping 241 matching lines @@
 // Note that IsStringUTF8 checks not only if the input is structurally
 // valid but also if it doesn't contain any non-character codepoint
 // (e.g. U+FFFE). It's done on purpose because all the existing callers want
 // to have the maximum 'discriminating' power from other encodings. If
 // there's a use case for just checking the structural validity, we have to
 // add a new function for that.
 BASE_EXPORT bool IsStringUTF8(const std::string& str);
 BASE_EXPORT bool IsStringASCII(const base::StringPiece& str);
 BASE_EXPORT bool IsStringASCII(const base::string16& str);
 
+BASE_EXPORT bool IsUpperCaseHexNumber(const std::string& number);
+
 // Converts the elements of the given string.  This version uses a pointer to
 // clearly differentiate it from the non-pointer variant.
 template <class str> inline void StringToLowerASCII(str* s) {
   for (typename str::iterator i = s->begin(); i != s->end(); ++i)
     *i = base::ToLowerASCII(*i);
 }
 
 template <class str> inline str StringToLowerASCII(const str& s) {
   // for std::string and std::wstring
   str output(s);
@@ skipping 73 matching lines @@
 }
 
 template <typename Char>
 inline bool IsHexDigit(Char c) {
   return (c >= '0' && c <= '9') ||
          (c >= 'A' && c <= 'F') ||
          (c >= 'a' && c <= 'f');
 }
 
 template <typename Char>
+inline bool IsUpperCaseHexDigit(Char c) {
+  return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F');
+}
+
+template <typename Char>
 inline Char HexDigitToInt(Char c) {
   DCHECK(IsHexDigit(c));
   if (c >= '0' && c <= '9')
     return c - '0';
   if (c >= 'A' && c <= 'F')
     return c - 'A' + 10;
   if (c >= 'a' && c <= 'f')
     return c - 'a' + 10;
   return 0;
 }
@@ skipping 150 matching lines @@
 #elif defined(WCHAR_T_IS_UTF32)
   typedef uint32 Unsigned;
 #endif
 };
 template<>
 struct ToUnsigned<short> {
   typedef unsigned short Unsigned;
 };
 
 #endif  // BASE_STRINGS_STRING_UTIL_H_