Fix mime type mappings when the unified media pipeline is enabled.

media/base/media.cc

 // 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.
 
 #include "media/base/media.h"
 
-#include "base/files/file_path.h"
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
-#include "base/path_service.h"
-#include "base/synchronization/lock.h"
+#include "base/metrics/field_trial.h"
 #include "base/trace_event/trace_event.h"
-#include "build/build_config.h"
+#include "media/base/media_switches.h"
 #include "media/base/yuv_convert.h"
 
+#if defined(OS_ANDROID)
+#include "media/base/android/media_codec_util.h"
+#endif
+
 #if !defined(MEDIA_DISABLE_FFMPEG)
 #include "media/ffmpeg/ffmpeg_common.h"
 #endif
 
 namespace media {
 
 // Media must only be initialized once, so use a LazyInstance to ensure this.
 class MediaInitializer {
+ public:
+  void enable_platform_decoder_support() {
+    has_platform_decoder_support_ = true;
+  }
+
+  bool has_platform_decoder_support() { return has_platform_decoder_support_; }
+
  private:
   friend struct base::DefaultLazyInstanceTraits<MediaInitializer>;
 
   MediaInitializer() {
     TRACE_EVENT_WARMUP_CATEGORY("audio");
     TRACE_EVENT_WARMUP_CATEGORY("media");
 
     // Perform initialization of libraries which require runtime CPU detection.
     InitializeCPUSpecificYUVConversions();
 
@@ skipping 10 matching lines @@
     av_max_alloc(0);
 #endif  // defined(ALLOCATOR_SHIM)
 
 #endif  // !defined(MEDIA_DISABLE_FFMPEG)
   }
 
   ~MediaInitializer() {
     NOTREACHED() << "MediaInitializer should be leaky!";
   }
 
+  bool has_platform_decoder_support_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(MediaInitializer);
 };
 
 static base::LazyInstance<MediaInitializer>::Leaky g_media_library =
     LAZY_INSTANCE_INITIALIZER;
 
 void InitializeMediaLibrary() {
   g_media_library.Get();
 }
 
+void EnablePlatformDecoderSupport() {
+  g_media_library.Pointer()->enable_platform_decoder_support();
+}
+
+bool HasPlatformDecoderSupport() {
+  return g_media_library.Pointer()->has_platform_decoder_support();
+}
+
+#if defined(OS_ANDROID)
+bool IsUnifiedMediaPipelineEnabled() {
+  // TODO(dalecurtis): This experiment is temporary and should be removed once
+  // we have enough data to support the primacy of the unified media pipeline;
+  // see http://crbug.com/533190 for details.
+  //
+  // Note: It's important to query the field trial state first, to ensure that
+  // UMA reports the correct group.
+  const std::string group_name =
+      base::FieldTrialList::FindFullName("UnifiedMediaPipelineTrial");
+  const bool enabled_via_cli =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableUnifiedMediaPipeline);
+  return enabled_via_cli ||
+         base::StartsWith(group_name, "Enabled", base::CompareCase::SENSITIVE);
+}
+
+bool IsUnifiedMediaPipelineEnabledForMse() {
+  // The unified media pipeline is available for MSE even when not normally

[ddorwin, 2016/02/16 20:34:36]

This comment applies to the second half of the condition. Perhaps break up the
return so that this comment can be above line 106 only.

[DaleCurtis, 2016/02/17 03:01:05]

Removed the comment and put it on the method prototype instead.

+  // enabled if the MediaCodec is not available -- since otherwise it would

[ddorwin, 2016/02/16 20:34:36]

This won't work unless you change the path that disables the MSE APIs altogether
in runtime_features.cc.

[DaleCurtis, 2016/02/17 03:01:05]

Thanks for the pointer, done!

+  // mean that MSE can't be used at all.

[ddorwin, 2016/02/16 20:34:37]

Codecs that are only supported by the platform (e.g. H.264) will not be
available.

+  return IsUnifiedMediaPipelineEnabled() ||

[DaleCurtis, 2016/02/13 05:54:28]

Just realized this part is wrong. It should not include the field trial test
here. Will fix next week.

[DaleCurtis, 2016/02/17 03:01:05]

Disregard, this seems okay. Don't remember why I wrote this :)

+         !MediaCodecUtil::IsMediaCodecAvailable();
+}
+#endif
+
 }  // namespace media