1 files changed, 77 insertions, 0 deletions
diff --git a/third_party/dav1d/src/ref.h b/third_party/dav1d/src/ref.h
new file mode 100644
index 0000000000..f1c96eb914
--- /dev/null
+++ b/third_party/dav1d/src/ref.h
@@ -0,0 +1,77 @@
+/*
+ * 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_SRC_REF_H
+#define DAV1D_SRC_REF_H
+
+#include "dav1d/dav1d.h"
+
+#include "src/mem.h"
+#include "src/thread.h"
+
+#include <stdatomic.h>
+#include <stddef.h>
+
+struct Dav1dRef {
+    void *data;
+    const void *const_data;
+    atomic_int ref_cnt;
+    int free_ref;
+    void (*free_callback)(const uint8_t *data, void *user_data);
+    void *user_data;
+};
+
+#if !TRACK_HEAP_ALLOCATIONS
+#define dav1d_ref_create(type, size) dav1d_ref_create(size)
+#endif
+
+Dav1dRef *dav1d_ref_create(enum AllocationType type, size_t size);
+Dav1dRef *dav1d_ref_create_using_pool(Dav1dMemPool *pool, size_t size);
+void dav1d_ref_dec(Dav1dRef **ref);
+
+static inline Dav1dRef *dav1d_ref_init(Dav1dRef *const ref, const void *const ptr,
+                                       void (*const free_callback)(const uint8_t *data, void *user_data),
+                                       void *const user_data, const int free_ref)
+{
+    ref->data = NULL;
+    ref->const_data = ptr;
+    atomic_init(&ref->ref_cnt, 1);
+    ref->free_ref = free_ref;
+    ref->free_callback = free_callback;
+    ref->user_data = user_data;
+    return ref;
+}
+
+static inline void dav1d_ref_inc(Dav1dRef *const ref) {
+    atomic_fetch_add_explicit(&ref->ref_cnt, 1, memory_order_relaxed);
+}
+
+static inline int dav1d_ref_is_writable(Dav1dRef *const ref) {
+    return atomic_load(&ref->ref_cnt) == 1 && ref->data;
+}
+
+#endif /* DAV1D_SRC_REF_H */