Rent-A-Codec: Reference count the shared iSAC bandwidth estimation state

webrtc/modules/audio_coding/acm2/rent_a_codec.h

 /*
  *  Copyright (c) 2015 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_ACM2_RENT_A_CODEC_H_
 #define WEBRTC_MODULES_AUDIO_CODING_ACM2_RENT_A_CODEC_H_
 
 #include <stddef.h>
 #include <map>
 #include <memory>
 
 #include "webrtc/base/array_view.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/optional.h"
+#include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
 #include "webrtc/modules/audio_coding/include/audio_coding_module_typedefs.h"
 #include "webrtc/typedefs.h"
 
-#if defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX)
-#include "webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h"
-#else
-// Dummy implementation, for when we don't have iSAC.
-namespace webrtc {
-class LockedIsacBandwidthInfo {};
-}
-#endif
-
 namespace webrtc {
 
 struct CodecInst;
+class LockedIsacBandwidthInfo;
 
 namespace acm2 {
 
 class RentACodec {
  public:
   enum class CodecId {
 #if defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX)
     kISAC,
 #endif
 #ifdef WEBRTC_CODEC_ISAC
@@ skipping 174 matching lines @@
   // will be stolen.
   std::unique_ptr<AudioEncoder> RentEncoderStack(StackParameters* param);
 
   // Creates and returns an iSAC decoder.
   std::unique_ptr<AudioDecoder> RentIsacDecoder();
 
  private:
   std::unique_ptr<AudioEncoder> speech_encoder_;
   std::unique_ptr<AudioEncoder> cng_encoder_;
   std::unique_ptr<AudioEncoder> red_encoder_;
-  LockedIsacBandwidthInfo isac_bandwidth_info_;
+  rtc::scoped_refptr<LockedIsacBandwidthInfo> isac_bandwidth_info_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(RentACodec);
 };
 
 }  // namespace acm2
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_ACM2_RENT_A_CODEC_H_