media: Prefer decrypting pipeline when CDM is attached

media/base/video_decoder_config.h

 // Copyright (c) 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.
 
 #ifndef MEDIA_BASE_VIDEO_DECODER_CONFIG_H_
 #define MEDIA_BASE_VIDEO_DECODER_CONFIG_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "media/base/encryption_scheme.h"
 #include "media/base/hdr_metadata.h"
 #include "media/base/media_export.h"
+#include "media/base/media_util.h"
 #include "media/base/video_codecs.h"
 #include "media/base/video_types.h"
 #include "ui/gfx/color_space.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 MEDIA_EXPORT VideoCodec
 VideoCodecProfileToVideoCodec(VideoCodecProfile profile);
@@ skipping 84 matching lines @@
   const EncryptionScheme& encryption_scheme() const {
     return encryption_scheme_;
   }
 
   void set_color_space_info(const gfx::ColorSpace& color_space_info);
   gfx::ColorSpace color_space_info() const;
 
   void set_hdr_metadata(const HDRMetadata& hdr_metadata);
   base::Optional<HDRMetadata> hdr_metadata() const;
 
+  // Sets the config to be encrypted or not encrypted manually. This can be

[DaleCurtis, 2017/02/24 18:03:50]

Ditto.

[xhwang, 2017/02/24 18:18:15]

Done.

+  // useful for decryptors that decrypts an encrypted stream to a clear stream,
+  // or for decoder selectors that wants to select decrypting decoders instead
+  // of clear decoders.
+  void set_is_encrypted(bool is_encrypted) {
+    if (!is_encrypted) {
+      DCHECK(encryption_scheme_.is_encrypted()) << "Config is already clear.";
+      encryption_scheme_ = Unencrypted();
+    } else {
+      DCHECK(!encryption_scheme_.is_encrypted())
+          << "Config is already encrypted.";
+      // TODO(xhwang): This is only used to guide decoder selection, so set
+      // a common encryption scheme that should be supported by all decrypting
+      // decoders. We should be able to remove this when we support switching
+      // decoders at run time. See http://crbug.com/695595
+      encryption_scheme_ = AesCtrEncryptionScheme();
+    }
+  }
+
  private:
   VideoCodec codec_;
   VideoCodecProfile profile_;
 
   VideoPixelFormat format_;
 
   // TODO(servolk): Deprecated, use color_space_info_ instead.
   ColorSpace color_space_;
 
   // Deprecated. TODO(wolenetz): Remove. See https://crbug.com/665539.
@@ skipping 10 matching lines @@
   base::Optional<HDRMetadata> hdr_metadata_;
 
   // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler
   // generated copy constructor and assignment operator. Since the extra data is
   // typically small, the performance impact is minimal.
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_DECODER_CONFIG_H_