media: Prefer decrypting pipeline when CDM is attached

media/base/video_decoder_config.cc

 // 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.
 
 #include "media/base/video_decoder_config.h"
 
 #include <vector>
 
 #include "base/logging.h"
+#include "media/base/media_util.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_types.h"
 
 namespace media {
 
 VideoCodec VideoCodecProfileToVideoCodec(VideoCodecProfile profile) {
   switch (profile) {
     case VIDEO_CODEC_PROFILE_UNKNOWN:
       return kUnknownVideoCodec;
     case H264PROFILE_BASELINE:
@@ skipping 131 matching lines @@
     << natural_size().height() << "]"
     << " has extra data? " << (extra_data().empty() ? "false" : "true")
     << " encrypted? " << (is_encrypted() ? "true" : "false");
   return s.str();
 }
 
 void VideoDecoderConfig::SetExtraData(const std::vector<uint8_t>& extra_data) {
   extra_data_ = extra_data;
 }
 
+void VideoDecoderConfig::SetIsEncrypted(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();
+  }
+}
+
 }  // namespace media