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diff --git a/third_party/libwebrtc/api/video/video_stream_decoder.h b/third_party/libwebrtc/api/video/video_stream_decoder.h
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+/*
+ * Copyright (c) 2018 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 API_VIDEO_VIDEO_STREAM_DECODER_H_
+#define API_VIDEO_VIDEO_STREAM_DECODER_H_
+
+#include <map>
+#include <memory>
+#include <utility>
+
+#include "api/units/time_delta.h"
+#include "api/video/encoded_frame.h"
+#include "api/video/video_content_type.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "api/video_codecs/video_decoder_factory.h"
+
+namespace webrtc {
+// NOTE: This class is still under development and may change without notice.
+class VideoStreamDecoderInterface {
+ public:
+ class Callbacks {
+ public:
+ virtual ~Callbacks() = default;
+
+ struct FrameInfo {
+ absl::optional<int> qp;
+ VideoContentType content_type;
+ };
+
+ // Called when the VideoStreamDecoder enters a non-decodable state.
+ virtual void OnNonDecodableState() = 0;
+
+ virtual void OnContinuousUntil(int64_t frame_id) {}
+
+ virtual void OnDecodedFrame(VideoFrame frame,
+ const FrameInfo& frame_info) = 0;
+ };
+
+ virtual ~VideoStreamDecoderInterface() = default;
+
+ virtual void OnFrame(std::unique_ptr<EncodedFrame> frame) = 0;
+
+ virtual void SetMinPlayoutDelay(TimeDelta min_delay) = 0;
+ virtual void SetMaxPlayoutDelay(TimeDelta max_delay) = 0;
+};
+
+} // namespace webrtc
+
+#endif // API_VIDEO_VIDEO_STREAM_DECODER_H_