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diff --git a/third_party/dav1d/src/ipred.h b/third_party/dav1d/src/ipred.h
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+/*
+ * Copyright © 2018-2021, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DAV1D_SRC_IPRED_H
+#define DAV1D_SRC_IPRED_H
+
+#include <stddef.h>
+
+#include "common/bitdepth.h"
+
+#include "src/levels.h"
+
+/*
+ * Intra prediction.
+ * - a is the angle (in degrees) for directional intra predictors. For other
+ *   modes, it is ignored;
+ * - topleft is the same as the argument given to dav1d_prepare_intra_edges(),
+ *   see ipred_prepare.h for more detailed documentation.
+ */
+#define decl_angular_ipred_fn(name) \
+void (name)(pixel *dst, ptrdiff_t stride, const pixel *topleft, \
+            int width, int height, int angle, int max_width, int max_height \
+            HIGHBD_DECL_SUFFIX)
+typedef decl_angular_ipred_fn(*angular_ipred_fn);
+
+/*
+ * Create a subsampled Y plane with the DC subtracted.
+ * - w/h_pad is the edge of the width/height that extends outside the visible
+ *   portion of the frame in 4px units;
+ * - ac has a stride of 16.
+ */
+#define decl_cfl_ac_fn(name) \
+void (name)(int16_t *ac, const pixel *y, ptrdiff_t stride, \
+            int w_pad, int h_pad, int cw, int ch)
+typedef decl_cfl_ac_fn(*cfl_ac_fn);
+
+/*
+ * dst[x,y] += alpha * ac[x,y]
+ * - alpha contains a q3 scalar in [-16,16] range;
+ */
+#define decl_cfl_pred_fn(name) \
+void (name)(pixel *dst, ptrdiff_t stride, const pixel *topleft, \
+            int width, int height, const int16_t *ac, int alpha \
+            HIGHBD_DECL_SUFFIX)
+typedef decl_cfl_pred_fn(*cfl_pred_fn);
+
+/*
+ * dst[x,y] = pal[idx[x,y]]
+ * - palette indices are [0-7]
+ * - only 16-byte alignment is guaranteed for idx.
+ */
+#define decl_pal_pred_fn(name) \
+void (name)(pixel *dst, ptrdiff_t stride, const pixel *pal, \
+            const uint8_t *idx, int w, int h)
+typedef decl_pal_pred_fn(*pal_pred_fn);
+
+typedef struct Dav1dIntraPredDSPContext {
+    angular_ipred_fn intra_pred[N_IMPL_INTRA_PRED_MODES];
+
+    // chroma-from-luma
+    cfl_ac_fn cfl_ac[3 /* 420, 422, 444 */];
+    cfl_pred_fn cfl_pred[DC_128_PRED + 1];
+
+    // palette
+    pal_pred_fn pal_pred;
+} Dav1dIntraPredDSPContext;
+
+bitfn_decls(void dav1d_intra_pred_dsp_init, Dav1dIntraPredDSPContext *c);
+
+#endif /* DAV1D_SRC_IPRED_H */