Cast: Added support for AES-CTR crypto.

media/cast/video_sender/video_sender.h

 // 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.
 
 #ifndef MEDIA_CAST_VIDEO_SENDER_VIDEO_SENDER_H_
 #define MEDIA_CAST_VIDEO_SENDER_VIDEO_SENDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/congestion_control/congestion_control.h"
 #include "media/cast/rtcp/rtcp.h"
 #include "media/cast/rtp_sender/rtp_sender.h"
 
+namespace crypto {
+  class Encryptor;
+}
+
 namespace media {
 namespace cast {
 
 class VideoEncoder;
 class LocalRtcpVideoSenderFeedback;
 class LocalRtpVideoSenderStatistics;
 class LocalVideoEncoderCallback;
 class PacedPacketSender;
 
 // Not thread safe. Only called from the main cast thread.
@@ skipping 64 matching lines @@
   void ResendFrame(uint32 resend_frame_id);
   void ReceivedAck(uint32 acked_frame_id);
   void UpdateFramesInFlight();
 
   void SendEncodedVideoFrameMainThread(
       scoped_ptr<EncodedVideoFrame> video_frame,
       const base::TimeTicks& capture_time);
 
   void InitializeTimers();
 
+  // Caller must allocate the destination |encrypted_video_frame| the data
+  // member will be resized to hold the encrypted size.
+  bool EncryptVideoFrame(const EncodedVideoFrame& encoded_frame,
+                         EncodedVideoFrame* encrypted_video_frame);
+
   const base::TimeDelta rtp_max_delay_;
   const int max_frame_rate_;
 
   scoped_refptr<CastEnvironment> cast_environment_;
   scoped_ptr<LocalRtcpVideoSenderFeedback> rtcp_feedback_;
   scoped_ptr<LocalRtpVideoSenderStatistics> rtp_video_sender_statistics_;
   scoped_refptr<VideoEncoder> video_encoder_;
   scoped_ptr<Rtcp> rtcp_;
   scoped_ptr<RtpSender> rtp_sender_;
   VideoEncoderController* video_encoder_controller_;
   uint8 max_unacked_frames_;
+  scoped_ptr<crypto::Encryptor> encryptor_;
+  std::string iv_mask_;
   int last_acked_frame_id_;
   int last_sent_frame_id_;
   int duplicate_ack_;
   base::TimeTicks last_send_time_;
   base::TimeTicks last_checked_skip_count_time_;
   int last_skip_count_;
   CongestionControl congestion_control_;
 
   bool initialized_;
   base::WeakPtrFactory<VideoSender> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoSender);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_VIDEO_SENDER_VIDEO_SENDER_H_