Load CMA backend from shared library

chromecast/media/base/media_codec_support.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 "chromecast/media/base/media_codec_support.h"
 
-// TODO(gunsch/servolk): delete this file once a solution exists upstream.
+#include "base/bind.h"
+#include "chromecast/media/base/media_caps.h"
+#include "chromecast/public/media_codec_support_shlib.h"
+#include "net/base/mime_util.h"
 
+// TODO(gunsch/servolk): delete this definition once a solution exists upstream.
 namespace net {
-
 bool DefaultIsCodecSupported(const std::string&) {
   return true;
 }
+}
 
-}  // namespace net
+namespace chromecast {
+namespace media {
+namespace {
 
+bool IsCodecSupported(const std::string& codec) {
+  MediaCodecSupportShlib::CodecSupport platform_support =
+      MediaCodecSupportShlib::IsSupported(codec);
+  if (platform_support == MediaCodecSupportShlib::kSupported)
+    return true;
+  else if (platform_support == MediaCodecSupportShlib::kNotSupported)
+    return false;
+
+  if (codec == "aac51") {
+    return ::media::HdmiSinkSupportsPcmSurroundSound();
+  }
+  if (codec == "ac-3" || codec == "mp4a.a5") {
+    return ::media::HdmiSinkSupportsAC3();
+  }
+  if (codec == "ec-3" || codec == "mp4a.a6") {
+    return ::media::HdmiSinkSupportsEAC3();
+  }
+
+  return net::DefaultIsCodecSupported(codec);
+}
+
+}  // namespace
+
+net::IsCodecSupportedCB GetIsCodecSupportedOnChromecastCB() {
+  return base::Bind(&IsCodecSupported);
+}
+
+}  // namespace media
+}  // namespace chromecast