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diff --git a/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/wavreader_interface.h b/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/wavreader_interface.h
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+++ b/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/wavreader_interface.h
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+/*
+ *  Copyright (c) 2017 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 MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_WAVREADER_INTERFACE_H_
+#define MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_WAVREADER_INTERFACE_H_
+
+#include <stddef.h>
+
+#include "api/array_view.h"
+
+namespace webrtc {
+namespace test {
+namespace conversational_speech {
+
+class WavReaderInterface {
+ public:
+  virtual ~WavReaderInterface() = default;
+
+  // Returns the number of samples read.
+  virtual size_t ReadFloatSamples(rtc::ArrayView<float> samples) = 0;
+  virtual size_t ReadInt16Samples(rtc::ArrayView<int16_t> samples) = 0;
+
+  // Getters.
+  virtual int SampleRate() const = 0;
+  virtual size_t NumChannels() const = 0;
+  virtual size_t NumSamples() const = 0;
+};
+
+}  // namespace conversational_speech
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_WAVREADER_INTERFACE_H_