Pass ownership of external encoders to the ACM

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.h

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
 
+#include <memory>
 #include <vector>
 
 #include "webrtc/base/buffer.h"
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
 
 namespace webrtc {
 
 // This class implements redundant audio coding. The class object will have an
 // underlying AudioEncoder object that performs the actual encodings. The
 // current class will gather the two latest encodings from the underlying codec
 // into one packet.
 class AudioEncoderCopyRed final : public AudioEncoder {
  public:
   struct Config {
-   public:
+    Config();
+    Config(Config&&);
+    ~Config();
     int payload_type;
-    AudioEncoder* speech_encoder;
+    std::unique_ptr<AudioEncoder> speech_encoder;
   };
 
-  // Caller keeps ownership of the AudioEncoder object.
-  explicit AudioEncoderCopyRed(const Config& config);
+  explicit AudioEncoderCopyRed(Config&& config);
 
   ~AudioEncoderCopyRed() override;
 
   size_t MaxEncodedBytes() const override;
   int SampleRateHz() const override;
   size_t NumChannels() const override;
   int RtpTimestampRateHz() const override;
   size_t Num10MsFramesInNextPacket() const override;
   size_t Max10MsFramesInAPacket() const override;
   int GetTargetBitrate() const override;
   void Reset() override;
   bool SetFec(bool enable) override;
   bool SetDtx(bool enable) override;
   bool SetApplication(Application application) override;
   void SetMaxPlaybackRate(int frequency_hz) override;
   void SetProjectedPacketLossRate(double fraction) override;
   void SetTargetBitrate(int target_bps) override;
 
 protected:
   EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
                          rtc::ArrayView<const int16_t> audio,
                          rtc::Buffer* encoded) override;
 
  private:
-  AudioEncoder* speech_encoder_;
+  std::unique_ptr<AudioEncoder> speech_encoder_;
   int red_payload_type_;
   rtc::Buffer secondary_encoded_;
   EncodedInfoLeaf secondary_info_;
   RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderCopyRed);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_