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diff --git a/third_party/dav1d/tools/output/muxer.h b/third_party/dav1d/tools/output/muxer.h
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+++ b/third_party/dav1d/tools/output/muxer.h
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+/*
+ * Copyright © 2018, 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_OUTPUT_MUXER_H
+#define DAV1D_OUTPUT_MUXER_H
+
+#include "picture.h"
+
+typedef struct MuxerPriv MuxerPriv;
+typedef struct Muxer {
+    int priv_data_size;
+    const char *name;
+    const char *extension;
+    int (*write_header)(MuxerPriv *ctx, const char *filename,
+                        const Dav1dPictureParameters *p, const unsigned fps[2]);
+    int (*write_picture)(MuxerPriv *ctx, Dav1dPicture *p);
+    void (*write_trailer)(MuxerPriv *ctx);
+    /**
+     * Verifies the muxed data (for example in the md5 muxer). Replaces write_trailer.
+     *
+     * @param  hash_string Muxer specific reference value.
+     *
+     * @return 0 on success.
+     */
+    int (*verify)(MuxerPriv *ctx, const char *hash_string);
+} Muxer;
+
+#endif /* DAV1D_OUTPUT_MUXER_H */