avfilter: add metal utilities

Reviewed-by: Ridley Combs <rcombs@rcombs.me>
Signed-off-by: Aman Karmani <aman@tmm1.net>

libavfilter/metal/utils.h

@@ -0,0 +1,35 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFILTER_METAL_UTILS_H
+#define AVFILTER_METAL_UTILS_H
+
+#include <Metal/Metal.h>
+#include <CoreVideo/CoreVideo.h>
+
+void ff_metal_compute_encoder_dispatch(id<MTLDevice> device,
+                                       id<MTLComputePipelineState> pipeline,
+                                       id<MTLComputeCommandEncoder> encoder,
+                                       NSUInteger width, NSUInteger height);
+
+CVMetalTextureRef ff_metal_texture_from_pixbuf(void *avclass,
+                                               CVMetalTextureCacheRef textureCache,
+                                               CVPixelBufferRef pixbuf,
+                                               int plane,
+                                               MTLPixelFormat format);
+#endif /* AVFILTER_METAL_UTILS_H */