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diff --git a/webrtc/modules/audio_processing/include/audio_frame_proxies.h b/webrtc/modules/audio_processing/include/audio_frame_proxies.h
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+/*
+ *  Copyright (c) 2020 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_INCLUDE_AUDIO_FRAME_PROXIES_H_
+#define MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_PROXIES_H_
+
+namespace webrtc {
+
+class AudioFrame;
+class AudioProcessing;
+
+// Processes a 10 ms |frame| of the primary audio stream using the provided
+// AudioProcessing object. On the client-side, this is the near-end (or
+// captured) audio. The |sample_rate_hz_|, |num_channels_|, and
+// |samples_per_channel_| members of |frame| must be valid. If changed from the
+// previous call to this function, it will trigger an initialization of the
+// provided AudioProcessing object.
+// The function returns any error codes passed from the AudioProcessing
+// ProcessStream method.
+int ProcessAudioFrame(AudioProcessing* ap, AudioFrame* frame);
+
+// Processes a 10 ms |frame| of the reverse direction audio stream using the
+// provided AudioProcessing object. The frame may be modified. On the
+// client-side, this is the far-end (or to be rendered) audio. The
+// |sample_rate_hz_|, |num_channels_|, and |samples_per_channel_| members of
+// |frame| must be valid. If changed from the previous call to this function, it
+// will trigger an initialization of the provided AudioProcessing object.
+// The function returns any error codes passed from the AudioProcessing
+// ProcessReverseStream method.
+int ProcessReverseAudioFrame(AudioProcessing* ap, AudioFrame* frame);
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_PROXIES_H_