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diff --git a/third_party/dav1d/src/picture.h b/third_party/dav1d/src/picture.h
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+++ b/third_party/dav1d/src/picture.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_PICTURE_H
+#define DAV1D_SRC_PICTURE_H
+
+#include <stdatomic.h>
+
+#include "src/thread.h"
+#include "dav1d/picture.h"
+
+#include "src/thread_data.h"
+#include "src/ref.h"
+
+enum PlaneType {
+    PLANE_TYPE_Y,
+    PLANE_TYPE_UV,
+    PLANE_TYPE_BLOCK,
+    PLANE_TYPE_ALL,
+};
+
+enum PictureFlags {
+    PICTURE_FLAG_NEW_SEQUENCE =       1 << 0,
+    PICTURE_FLAG_NEW_OP_PARAMS_INFO = 1 << 1,
+    PICTURE_FLAG_NEW_TEMPORAL_UNIT  = 1 << 2,
+};
+
+typedef struct Dav1dThreadPicture {
+    Dav1dPicture p;
+    int visible;
+    // This can be set for inter frames, non-key intra frames, or for invisible
+    // keyframes that have not yet been made visible using the show-existing-frame
+    // mechanism.
+    int showable;
+    enum PictureFlags flags;
+    // [0] block data (including segmentation map and motion vectors)
+    // [1] pixel data
+    atomic_uint *progress;
+} Dav1dThreadPicture;
+
+typedef struct Dav1dPictureBuffer {
+    void *data;
+    struct Dav1dPictureBuffer *next;
+} Dav1dPictureBuffer;
+
+/*
+ * Allocate a picture with custom border size.
+ */
+int dav1d_thread_picture_alloc(Dav1dContext *c, Dav1dFrameContext *f, const int bpc);
+
+/**
+ * Allocate a picture with identical metadata to an existing picture.
+ * The width is a separate argument so this function can be used for
+ * super-res, where the width changes, but everything else is the same.
+ * For the more typical use case of allocating a new image of the same
+ * dimensions, use src->p.w as width.
+ */
+int dav1d_picture_alloc_copy(Dav1dContext *c, Dav1dPicture *dst, const int w,
+                             const Dav1dPicture *src);
+
+/**
+ * Create a copy of a picture.
+ */
+void dav1d_picture_ref(Dav1dPicture *dst, const Dav1dPicture *src);
+void dav1d_thread_picture_ref(Dav1dThreadPicture *dst,
+                              const Dav1dThreadPicture *src);
+void dav1d_thread_picture_move_ref(Dav1dThreadPicture *dst,
+                                   Dav1dThreadPicture *src);
+void dav1d_thread_picture_unref(Dav1dThreadPicture *p);
+
+/**
+ * Move a picture reference.
+ */
+void dav1d_picture_move_ref(Dav1dPicture *dst, Dav1dPicture *src);
+
+int dav1d_default_picture_alloc(Dav1dPicture *p, void *cookie);
+void dav1d_default_picture_release(Dav1dPicture *p, void *cookie);
+void dav1d_picture_unref_internal(Dav1dPicture *p);
+
+void dav1d_picture_copy_props(Dav1dPicture *p,
+                              Dav1dContentLightLevel *content_light, Dav1dRef *content_light_ref,
+                              Dav1dMasteringDisplay *mastering_display, Dav1dRef *mastering_display_ref,
+                              Dav1dITUTT35 *itut_t35, Dav1dRef *itut_t35_ref,
+                              const Dav1dDataProps *props);
+
+/**
+ * Get event flags from picture flags.
+ */
+enum Dav1dEventFlags dav1d_picture_get_event_flags(const Dav1dThreadPicture *p);
+
+#endif /* DAV1D_SRC_PICTURE_H */