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diff --git a/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h b/webrtc/modules/audio_coding/neteq/audio_decoder_impl.h
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+/*
+ *  Copyright (c) 2012 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_NETEQ_AUDIO_DECODER_IMPL_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_DECODER_IMPL_H_
+
+#include <assert.h>
+
+#include "webrtc/engine_configurations.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
+#include "webrtc/modules/audio_coding/codecs/cng/include/webrtc_cng.h"
+#ifdef WEBRTC_CODEC_G722
+#include "webrtc/modules/audio_coding/codecs/g722/include/g722_interface.h"
+#endif
+#include "webrtc/modules/audio_coding/main/acm2/rent_a_codec.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// AudioDecoderCng is a special type of AudioDecoder. It inherits from
+// AudioDecoder just to fit in the DecoderDatabase. None of the class methods
+// should be used, except constructor, destructor, and accessors.
+// TODO(hlundin): Consider the possibility to create a super-class to
+// AudioDecoder that is stored in DecoderDatabase. Then AudioDecoder and a
+// specific CngDecoder class could both inherit from that class.
+class AudioDecoderCng : public AudioDecoder {
+ public:
+  explicit AudioDecoderCng();
+  ~AudioDecoderCng() override;
+  void Reset() override;
+  int IncomingPacket(const uint8_t* payload,
+                     size_t payload_len,
+                     uint16_t rtp_sequence_number,
+                     uint32_t rtp_timestamp,
+                     uint32_t arrival_timestamp) override;
+
+  CNG_dec_inst* CngDecoderInstance() override;
+  size_t Channels() const override;
+
+ protected:
+  int DecodeInternal(const uint8_t* encoded,
+                     size_t encoded_len,
+                     int sample_rate_hz,
+                     int16_t* decoded,
+                     SpeechType* speech_type) override;
+
+ private:
+  CNG_dec_inst* dec_state_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(AudioDecoderCng);
+};
+
+using NetEqDecoder = acm2::RentACodec::NetEqDecoder;
+
+// Returns true if |codec_type| is supported.
+bool CodecSupported(NetEqDecoder codec_type);
+
+// Returns the sample rate for |codec_type|.
+int CodecSampleRateHz(NetEqDecoder codec_type);
+
+// Creates an AudioDecoder object of type |codec_type|. Returns NULL for for
+// unsupported codecs, and when creating an AudioDecoder is not applicable
+// (e.g., for RED and DTMF/AVT types).
+AudioDecoder* CreateAudioDecoder(NetEqDecoder codec_type);
+
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_DECODER_IMPL_H_