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diff --git a/third_party/aom/av1/ratectrl_rtc.h b/third_party/aom/av1/ratectrl_rtc.h
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+++ b/third_party/aom/av1/ratectrl_rtc.h
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+/*
+ * Copyright (c) 2021, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_AV1_RATECTRL_RTC_H_
+#define AOM_AV1_RATECTRL_RTC_H_
+
+#include <cstdint>
+#include <memory>
+
+struct AV1_COMP;
+
+namespace aom {
+
+// These constants come from AV1 spec.
+static constexpr size_t kAV1MaxLayers = 32;
+static constexpr size_t kAV1MaxTemporalLayers = 8;
+static constexpr size_t kAV1MaxSpatialLayers = 4;
+
+enum FrameType { kKeyFrame, kInterFrame };
+
+struct AV1RateControlRtcConfig {
+ public:
+  AV1RateControlRtcConfig();
+
+  int width;
+  int height;
+  // Flag indicating if the content is screen or not.
+  bool is_screen = false;
+  // 0-63
+  int max_quantizer;
+  int min_quantizer;
+  int64_t target_bandwidth;
+  int64_t buf_initial_sz;
+  int64_t buf_optimal_sz;
+  int64_t buf_sz;
+  int undershoot_pct;
+  int overshoot_pct;
+  int max_intra_bitrate_pct;
+  int max_inter_bitrate_pct;
+  int frame_drop_thresh;
+  int max_consec_drop;
+  double framerate;
+  int layer_target_bitrate[kAV1MaxLayers];
+  int ts_rate_decimator[kAV1MaxTemporalLayers];
+  int aq_mode;
+  // Number of spatial layers
+  int ss_number_layers;
+  // Number of temporal layers
+  int ts_number_layers;
+  int max_quantizers[kAV1MaxLayers];
+  int min_quantizers[kAV1MaxLayers];
+  int scaling_factor_num[kAV1MaxSpatialLayers];
+  int scaling_factor_den[kAV1MaxSpatialLayers];
+};
+
+struct AV1FrameParamsRTC {
+  FrameType frame_type;
+  int spatial_layer_id;
+  int temporal_layer_id;
+};
+
+struct AV1LoopfilterLevel {
+  int filter_level[2];
+  int filter_level_u;
+  int filter_level_v;
+};
+
+struct AV1CdefInfo {
+  int cdef_strength_y;
+  int cdef_strength_uv;
+  int damping;
+};
+
+struct AV1SegmentationData {
+  const uint8_t *segmentation_map;
+  size_t segmentation_map_size;
+  const int *delta_q;
+  size_t delta_q_size;
+};
+
+enum class FrameDropDecision {
+  kOk,    // Frame is encoded.
+  kDrop,  // Frame is dropped.
+};
+
+class AV1RateControlRTC {
+ public:
+  static std::unique_ptr<AV1RateControlRTC> Create(
+      const AV1RateControlRtcConfig &cfg);
+  ~AV1RateControlRTC();
+
+  bool UpdateRateControl(const AV1RateControlRtcConfig &rc_cfg);
+  // GetQP() needs to be called after ComputeQP() to get the latest QP
+  int GetQP() const;
+  // GetLoopfilterLevel() needs to be called after ComputeQP()
+  AV1LoopfilterLevel GetLoopfilterLevel() const;
+  // GetCdefInfo() needs to be called after ComputeQP()
+  AV1CdefInfo GetCdefInfo() const;
+  // Returns the segmentation map used for cyclic refresh, based on 4x4 blocks.
+  bool GetSegmentationData(AV1SegmentationData *segmentation_data) const;
+  // ComputeQP returns the QP if the frame is not dropped (kOk return),
+  // otherwise it returns kDrop and subsequent GetQP and PostEncodeUpdate
+  // are not to be called (av1_rc_postencode_update_drop_frame is already
+  // called via ComputeQP if drop is decided).
+  FrameDropDecision ComputeQP(const AV1FrameParamsRTC &frame_params);
+  // Feedback to rate control with the size of current encoded frame
+  void PostEncodeUpdate(uint64_t encoded_frame_size);
+
+ private:
+  AV1RateControlRTC() = default;
+  bool InitRateControl(const AV1RateControlRtcConfig &cfg);
+  AV1_COMP *cpi_;
+  int initial_width_;
+  int initial_height_;
+};
+
+}  // namespace aom
+
+#endif  // AOM_AV1_RATECTRL_RTC_H_