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diff --git a/third_party/dav1d/src/looprestoration.h b/third_party/dav1d/src/looprestoration.h
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+++ b/third_party/dav1d/src/looprestoration.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_LOOPRESTORATION_H
+#define DAV1D_SRC_LOOPRESTORATION_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include "common/bitdepth.h"
+
+enum LrEdgeFlags {
+    LR_HAVE_LEFT = 1 << 0,
+    LR_HAVE_RIGHT = 1 << 1,
+    LR_HAVE_TOP = 1 << 2,
+    LR_HAVE_BOTTOM = 1 << 3,
+};
+
+#ifdef BITDEPTH
+typedef const pixel (*const_left_pixel_row)[4];
+#else
+typedef const void *const_left_pixel_row;
+#endif
+
+typedef union LooprestorationParams {
+    ALIGN(int16_t filter[2][8], 16);
+    struct {
+        uint32_t s0, s1;
+        int16_t w0, w1;
+    } sgr;
+} LooprestorationParams;
+
+// Although the spec applies restoration filters over 4x4 blocks,
+// they can be applied to a bigger surface.
+//    * w is constrained by the restoration unit size (w <= 256)
+//    * h is constrained by the stripe height (h <= 64)
+// The filter functions are allowed to do aligned writes past the right
+// edge of the buffer, aligned up to the minimum loop restoration unit size
+// (which is 32 pixels for subsampled chroma and 64 pixels for luma).
+#define decl_lr_filter_fn(name) \
+void (name)(pixel *dst, ptrdiff_t dst_stride, \
+            const_left_pixel_row left, \
+            const pixel *lpf, int w, int h, \
+            const LooprestorationParams *params, \
+            enum LrEdgeFlags edges HIGHBD_DECL_SUFFIX)
+typedef decl_lr_filter_fn(*looprestorationfilter_fn);
+
+typedef struct Dav1dLoopRestorationDSPContext {
+    looprestorationfilter_fn wiener[2]; /* 7-tap, 5-tap */
+    looprestorationfilter_fn sgr[3]; /* 5x5, 3x3, mix */
+} Dav1dLoopRestorationDSPContext;
+
+bitfn_decls(void dav1d_loop_restoration_dsp_init, Dav1dLoopRestorationDSPContext *c, int bpc);
+
+#endif /* DAV1D_SRC_LOOPRESTORATION_H */