Use passthrough decoder for (E)AC3 formats

media/base/mime_util_internal.cc

 // Copyright 2012 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/base/mime_util_internal.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 461 matching lines @@
 
   // NOTE: We do not account for Media Source Extensions (MSE) within these
   // checks since it has its own isTypeSupported() which will handle platform
   // specific codec rejections.  See http://crbug.com/587303.
 
   switch (codec) {
     // ----------------------------------------------------------------------
     // The following codecs are never supported.
     // ----------------------------------------------------------------------
     case INVALID_CODEC:
-    case AC3:
-    case EAC3:
     case THEORA:
       return false;
 
     // ----------------------------------------------------------------------
     // The remaining codecs may be supported depending on platform abilities.
     // ----------------------------------------------------------------------
 
     case PCM:
     case MP3:
     case MPEG4_AAC:
@@ skipping 81 matching lines @@
       if (!platform_info.has_platform_vp9_decoder)
         return false;
 
       // Encrypted content is demuxed so the container is irrelevant.
       if (is_encrypted)
         return true;
 
       // MediaPlayer only supports VP9 in WebM.
       return mime_type_lower_case == "video/webm";
     }
+
+    case AC3:
+    case EAC3:
+#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+      return true;
+#else
+      return false;
+#endif
   }
 
   return false;
 }
 
 bool MimeUtil::StringToCodec(const std::string& mime_type_lower_case,
                              const std::string& codec_id,
                              Codec* codec,
                              bool* is_ambiguous,
                              VideoCodecProfile* out_profile,
@@ skipping 138 matching lines @@
     const std::string& mime_type_lower_case,
     bool is_encrypted) const {
   Codec default_codec = Codec::INVALID_CODEC;
   if (!GetDefaultCodecLowerCase(mime_type_lower_case, &default_codec))
     return false;
   return IsCodecSupported(default_codec, mime_type_lower_case, is_encrypted);
 }
 
 }  // namespace internal
 }  // namespace media