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diff --git a/examples/dp_fifo.h b/examples/dp_fifo.h
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+/*
+ * Copyright © 2019, VideoLAN and dav1d authors
+ * 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.
+ */
+
+/*
+ * Dav1dPlay FIFO helper
+ */
+
+typedef struct dp_fifo Dav1dPlayPtrFifo;
+
+/* Create a FIFO
+ *
+ * Creates a FIFO with the given capacity.
+ * If the capacity is reached, new inserts into the FIFO
+ * will block until enough space is available again.
+ */
+Dav1dPlayPtrFifo *dp_fifo_create(size_t capacity);
+
+/* Destroy a FIFO
+ *
+ * The FIFO must be empty before it is destroyed!
+ */
+void dp_fifo_destroy(Dav1dPlayPtrFifo *fifo);
+
+/* Shift FIFO
+ *
+ * Return the first item from the FIFO, thereby removing it from
+ * the FIFO and making room for new entries.
+ */
+void *dp_fifo_shift(Dav1dPlayPtrFifo *fifo);
+
+/* Push to FIFO
+ *
+ * Add an item to the end of the FIFO.
+ * If the FIFO is full, this call will block until there is again enough
+ * space in the FIFO, so calling this from the "consumer" thread if no
+ * other thread will call dp_fifo_shift will lead to a deadlock.
+ */
+void dp_fifo_push(Dav1dPlayPtrFifo *fifo, void *element);