1 files changed, 107 insertions, 0 deletions
diff --git a/third_party/dav1d/src/ref.c b/third_party/dav1d/src/ref.c
new file mode 100644
index 0000000000..46462b4c80
--- /dev/null
+++ b/third_party/dav1d/src/ref.c
@@ -0,0 +1,107 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+
+#include "src/ref.h"
+
+static void default_free_callback(const uint8_t *const data, void *const user_data) {
+    assert(data == user_data);
+    dav1d_free_aligned(user_data);
+}
+
+Dav1dRef *dav1d_ref_create(size_t size) {
+    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
+
+    uint8_t *const data = dav1d_alloc_aligned(size + sizeof(Dav1dRef), 64);
+    if (!data) return NULL;
+
+    Dav1dRef *const res = (Dav1dRef*)(data + size);
+    res->const_data = res->user_data = res->data = data;
+    atomic_init(&res->ref_cnt, 1);
+    res->free_ref = 0;
+    res->free_callback = default_free_callback;
+
+    return res;
+}
+
+static void pool_free_callback(const uint8_t *const data, void *const user_data) {
+    dav1d_mem_pool_push((Dav1dMemPool*)data, user_data);
+}
+
+Dav1dRef *dav1d_ref_create_using_pool(Dav1dMemPool *const pool, size_t size) {
+    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
+
+    Dav1dMemPoolBuffer *const buf =
+        dav1d_mem_pool_pop(pool, size + sizeof(Dav1dRef));
+    if (!buf) return NULL;
+
+    Dav1dRef *const res = &((Dav1dRef*)buf)[-1];
+    res->data = buf->data;
+    res->const_data = pool;
+    atomic_init(&res->ref_cnt, 1);
+    res->free_ref = 0;
+    res->free_callback = pool_free_callback;
+    res->user_data = buf;
+
+    return res;
+}
+
+Dav1dRef *dav1d_ref_wrap(const uint8_t *const ptr,
+                         void (*free_callback)(const uint8_t *data, void *user_data),
+                         void *const user_data)
+{
+    Dav1dRef *res = malloc(sizeof(Dav1dRef));
+    if (!res) return NULL;
+
+    res->data = NULL;
+    res->const_data = ptr;
+    atomic_init(&res->ref_cnt, 1);
+    res->free_ref = 1;
+    res->free_callback = free_callback;
+    res->user_data = user_data;
+
+    return res;
+}
+
+void dav1d_ref_dec(Dav1dRef **const pref) {
+    assert(pref != NULL);
+
+    Dav1dRef *const ref = *pref;
+    if (!ref) return;
+
+    *pref = NULL;
+    if (atomic_fetch_sub(&ref->ref_cnt, 1) == 1) {
+        const int free_ref = ref->free_ref;
+        ref->free_callback(ref->const_data, ref->user_data);
+        if (free_ref) free(ref);
+    }
+}
+
+int dav1d_ref_is_writable(Dav1dRef *const ref) {
+    return atomic_load(&ref->ref_cnt) == 1 && ref->data;
+}