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diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h b/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h
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+++ b/webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.h
@@ -0,0 +1,95 @@
+/*
+ *  Copyright (c) 2013 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_MOCK_MOCK_EXTERNAL_DECODER_PCM16B_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_MOCK_MOCK_EXTERNAL_DECODER_PCM16B_H_
+
+#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_coding/codecs/pcm16b/include/pcm16b.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+using ::testing::_;
+using ::testing::Invoke;
+
+// Implement an external version of the PCM16b decoder. This is a copy from
+// audio_decoder_impl.{cc, h}.
+class ExternalPcm16B : public AudioDecoder {
+ public:
+  ExternalPcm16B() {}
+  void Reset() override {}
+
+ protected:
+  int DecodeInternal(const uint8_t* encoded,
+                     size_t encoded_len,
+                     int sample_rate_hz,
+                     int16_t* decoded,
+                     SpeechType* speech_type) override {
+    size_t ret = WebRtcPcm16b_Decode(encoded, encoded_len, decoded);
+    *speech_type = ConvertSpeechType(1);
+    return static_cast<int>(ret);
+  }
+  size_t Channels() const override { return 1; }
+
+ private:
+  RTC_DISALLOW_COPY_AND_ASSIGN(ExternalPcm16B);
+};
+
+// Create a mock of ExternalPcm16B which delegates all calls to the real object.
+// The reason is that we can then track that the correct calls are being made.
+class MockExternalPcm16B : public ExternalPcm16B {
+ public:
+  MockExternalPcm16B() {
+    // By default, all calls are delegated to the real object.
+    ON_CALL(*this, Decode(_, _, _, _, _, _))
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::Decode));
+    ON_CALL(*this, HasDecodePlc())
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::HasDecodePlc));
+    ON_CALL(*this, DecodePlc(_, _))
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::DecodePlc));
+    ON_CALL(*this, Reset())
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::Reset));
+    ON_CALL(*this, IncomingPacket(_, _, _, _, _))
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::IncomingPacket));
+    ON_CALL(*this, ErrorCode())
+        .WillByDefault(Invoke(&real_, &ExternalPcm16B::ErrorCode));
+  }
+  virtual ~MockExternalPcm16B() { Die(); }
+
+  MOCK_METHOD0(Die, void());
+  MOCK_METHOD6(Decode,
+               int(const uint8_t* encoded,
+                   size_t encoded_len,
+                   int sample_rate_hz,
+                   size_t max_decoded_bytes,
+                   int16_t* decoded,
+                   SpeechType* speech_type));
+  MOCK_CONST_METHOD0(HasDecodePlc,
+      bool());
+  MOCK_METHOD2(DecodePlc,
+      size_t(size_t num_frames, int16_t* decoded));
+  MOCK_METHOD0(Reset, void());
+  MOCK_METHOD5(IncomingPacket,
+      int(const uint8_t* payload, size_t payload_len,
+          uint16_t rtp_sequence_number, uint32_t rtp_timestamp,
+          uint32_t arrival_timestamp));
+  MOCK_METHOD0(ErrorCode,
+      int());
+
+ private:
+  ExternalPcm16B real_;
+};
+
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_MOCK_MOCK_EXTERNAL_DECODER_PCM16B_H_