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diff --git a/third_party/libwebrtc/media/base/audio_source.h b/third_party/libwebrtc/media/base/audio_source.h
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+++ b/third_party/libwebrtc/media/base/audio_source.h
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+/*
+ *  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 MEDIA_BASE_AUDIO_SOURCE_H_
+#define MEDIA_BASE_AUDIO_SOURCE_H_
+
+#include <cstddef>
+
+#include "absl/types/optional.h"
+
+namespace cricket {
+
+// Abstract interface for providing the audio data.
+// TODO(deadbeef): Rename this to AudioSourceInterface, and rename
+// webrtc::AudioSourceInterface to AudioTrackSourceInterface.
+class AudioSource {
+ public:
+  class Sink {
+   public:
+    // Callback to receive data from the AudioSource.
+    virtual void OnData(
+        const void* audio_data,
+        int bits_per_sample,
+        int sample_rate,
+        size_t number_of_channels,
+        size_t number_of_frames,
+        absl::optional<int64_t> absolute_capture_timestamp_ms) = 0;
+
+    // Called when the AudioSource is going away.
+    virtual void OnClose() = 0;
+
+    // Returns the number of channels encoded by the sink. This can be less than
+    // the number_of_channels if down-mixing occur. A value of -1 means an
+    // unknown number.
+    virtual int NumPreferredChannels() const = 0;
+
+   protected:
+    virtual ~Sink() {}
+  };
+
+  // Sets a sink to the AudioSource. There can be only one sink connected
+  // to the source at a time.
+  virtual void SetSink(Sink* sink) = 0;
+
+ protected:
+  virtual ~AudioSource() {}
+};
+
+}  // namespace cricket
+
+#endif  // MEDIA_BASE_AUDIO_SOURCE_H_