Remove Exynos from MediaCodec blacklist. Limit MediaTek blacklist.

media/base/android/media_codec_util.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.
 
 #include "media/base/android/media_codec_util.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 185 matching lines @@
         break;
       }
     }
   }
   DVLOG(1) << __PRETTY_FUNCTION__ << "Default codec for " << mime_type << " : "
            << codec_name;
   // It would be nice if MediaCodecInfo externalized some notion of
   // HW-acceleration but it doesn't. Android Media guidance is that the
   // "OMX.google" prefix is always used for SW decoders, so that's what we
   // use. "OMX.SEC.*" codec is Samsung software implementation - report it
-  // as unaccelerated as well. Also temporary blacklist Exynos and MediaTek
-  // devices while HW decoder video freezes and distortions are
-  // investigated - http://crbug.com/446974.
+  // as unaccelerated as well. MediaTek hardware vp8 is known slower than
+  // the software implementation. http://crbug.com/446974.
   if (codec_name.length() > 0) {
-    return (base::StartsWith(codec_name, "OMX.google.",
-                             base::CompareCase::SENSITIVE) ||
-            base::StartsWith(codec_name, "OMX.SEC.",
-                             base::CompareCase::SENSITIVE) ||
-            base::StartsWith(codec_name, "OMX.MTK.",
-                             base::CompareCase::SENSITIVE) ||
-            base::StartsWith(codec_name, "OMX.Exynos.",
-                             base::CompareCase::SENSITIVE));
+    return base::StartsWith(codec_name, "OMX.google.",
+                            base::CompareCase::SENSITIVE) ||
+           base::StartsWith(codec_name, "OMX.SEC.",
+                            base::CompareCase::SENSITIVE) ||
+           (base::StartsWith(codec_name, "OMX.MTK.",
+                             base::CompareCase::SENSITIVE) &&
+            mime_type == "video/x-vnd.on2.vp8");
   }
   return true;
 }
 
 // static
 bool MediaCodecUtil::IsHLSPath(const GURL& url) {
   if (!url.SchemeIsHTTPOrHTTPS() && !url.SchemeIsFile())
     return false;
 
   std::string path = url.path();
@@ skipping 20 matching lines @@
 // static
 bool MediaCodecUtil::IsVp8DecoderAvailable() {
   if (!IsMediaCodecAvailable())
     return false;
 
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_mime = ConvertUTF8ToJavaString(env, "vp8");
   return Java_MediaCodecUtil_isDecoderSupportedForDevice(env, j_mime.obj());
 }
 
+// static
+bool MediaCodecUtil::IsVp8EncoderAvailable() {
+  // Currently the vp8 encoder and decoder blacklists cover the same devices,
+  // but we have a second method for clarity in future issues.
+  return IsVp8DecoderAvailable();
+}
+
 }  // namespace media