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diff --git a/src/dsp/obmc.h b/src/dsp/obmc.h
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+/*
+ * Copyright 2019 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_DSP_OBMC_H_
+#define LIBGAV1_SRC_DSP_OBMC_H_
+
+// Pull in LIBGAV1_DspXXX defines representing the implementation status
+// of each function. The resulting value of each can be used by each module to
+// determine whether an implementation is needed at compile time.
+// IWYU pragma: begin_exports
+
+// ARM:
+#include "src/dsp/arm/obmc_neon.h"
+
+// x86:
+// Note includes should be sorted in logical order avx2/avx/sse4, etc.
+// The order of includes is important as each tests for a superior version
+// before setting the base.
+// clang-format off
+#include "src/dsp/x86/obmc_sse4.h"
+// clang-format on
+
+// IWYU pragma: end_exports
+
+namespace libgav1 {
+namespace dsp {
+
+// Initializes Dsp::obmc_blend. This function is not thread-safe.
+void ObmcInit_C();
+
+}  // namespace dsp
+}  // namespace libgav1
+
+#endif  // LIBGAV1_SRC_DSP_OBMC_H_