Cast: Added support for AES-CTR crypto.

media/cast/audio_sender/audio_sender.h

Index: media/cast/audio_sender/audio_sender.h
diff --git a/media/cast/audio_sender/audio_sender.h b/media/cast/audio_sender/audio_sender.h
index ca1fffb37f2416664f5dae8a3a6cbad7997b1287..5abdfcc10a7fa43636be65a7e074415c39dc90da 100644
--- a/media/cast/audio_sender/audio_sender.h
+++ b/media/cast/audio_sender/audio_sender.h
@@ -12,6 +12,7 @@
 #include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
+#include "crypto/encryptor.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/rtcp/rtcp.h"
@@ -66,6 +67,9 @@ class AudioSender : public base::NonThreadSafe,
   void ResendPackets(
       const MissingFramesAndPacketsMap& missing_frames_and_packets);
 
+  bool EncryptAudioFrame(const EncodedAudioFrame* audio_frame,

[Alpha Left Google, 2013/11/07 01:10:11]

Why not just return scoped_ptr<T>?

[pwestin, 2013/11/07 17:16:04]

Same as above; I think this is cleaner since the ptr can be NULL

+                         EncodedAudioFrame* encrypted_frame);
+
   void ScheduleNextRtcpReport();
   void SendRtcpReport();
 
@@ -78,6 +82,8 @@ class AudioSender : public base::NonThreadSafe,
   scoped_ptr<LocalRtpSenderStatistics> rtp_audio_sender_statistics_;
   scoped_ptr<LocalRtcpAudioSenderFeedback> rtcp_feedback_;
   Rtcp rtcp_;
+  scoped_ptr<crypto::Encryptor> encryptor_;
+  std::string iv_mask_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSender);
 };