media: Prefer decrypting pipeline when CDM is attached

media/base/audio_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/audio_decoder_config.h"
 
 #include "base/logging.h"
 #include "media/base/limits.h"
+#include "media/base/media_util.h"
 
 namespace media {
 
 AudioDecoderConfig::AudioDecoderConfig()
     : codec_(kUnknownAudioCodec),
       sample_format_(kUnknownSampleFormat),
       bytes_per_channel_(0),
       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
       samples_per_second_(0),
       bytes_per_frame_(0),
@@ skipping 69 matching lines @@
     << " samples_per_second: " << samples_per_second()
     << " sample_format: " << sample_format()
     << " bytes_per_frame: " << bytes_per_frame()
     << " seek_preroll: " << seek_preroll().InMilliseconds() << "ms"
     << " codec_delay: " << codec_delay() << " has extra data? "
     << (extra_data().empty() ? "false" : "true") << " encrypted? "
     << (is_encrypted() ? "true" : "false");
   return s.str();
 }
 
+void AudioDecoderConfig::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