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diff --git a/media/libaom/src/av1/encoder/pass2_strategy.h b/media/libaom/src/av1/encoder/pass2_strategy.h
new file mode 100644
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+++ b/media/libaom/src/av1/encoder/pass2_strategy.h
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+/*
+ * Copyright (c) 2019, 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_ENCODER_PASS2_STRATEGY_H_
+#define AOM_AV1_ENCODER_PASS2_STRATEGY_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct AV1_COMP;
+struct EncodeFrameParams;
+// structure of accumulated stats and features in a gf group
+typedef struct {
+  double gf_group_err;
+  double gf_group_raw_error;
+  double gf_group_skip_pct;
+  double gf_group_inactive_zone_rows;
+
+  double mv_ratio_accumulator;
+  double decay_accumulator;
+  double zero_motion_accumulator;
+  double loop_decay_rate;
+  double last_loop_decay_rate;
+  double this_frame_mv_in_out;
+  double mv_in_out_accumulator;
+  double abs_mv_in_out_accumulator;
+
+  double avg_sr_coded_error;
+  double avg_tr_coded_error;
+  double avg_pcnt_second_ref;
+  double avg_pcnt_third_ref;
+  double avg_pcnt_third_ref_nolast;
+  double avg_new_mv_count;
+  double avg_wavelet_energy;
+  double avg_raw_err_stdev;
+  int non_zero_stdev_count;
+
+  unsigned int allow_alt_ref;
+} GF_GROUP_STATS;
+
+typedef struct {
+  double frame_err;
+  double frame_coded_error;
+  double frame_sr_coded_error;
+  double frame_tr_coded_error;
+} GF_FRAME_STATS;
+
+void av1_init_second_pass(struct AV1_COMP *cpi);
+
+void av1_init_single_pass_lap(AV1_COMP *cpi);
+
+void av1_get_second_pass_params(struct AV1_COMP *cpi,
+                                struct EncodeFrameParams *const frame_params,
+                                const EncodeFrameInput *const frame_input,
+                                unsigned int frame_flags);
+
+void av1_twopass_postencode_update(struct AV1_COMP *cpi);
+
+void av1_gop_bit_allocation(const AV1_COMP *cpi, RATE_CONTROL *const rc,
+                            GF_GROUP *gf_group, int is_key_frame, int use_arf,
+                            int64_t gf_group_bits);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_AV1_ENCODER_PASS2_STRATEGY_H_