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diff --git a/media/ffvpx/libavutil/hwcontext_drm.h b/media/ffvpx/libavutil/hwcontext_drm.h
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+/*
+ * 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 AVUTIL_HWCONTEXT_DRM_H
+#define AVUTIL_HWCONTEXT_DRM_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * @file
+ * API-specific header for AV_HWDEVICE_TYPE_DRM.
+ *
+ * Internal frame allocation is not currently supported - all frames
+ * must be allocated by the user. Thus AVHWFramesContext is always
+ * NULL, though this may change if support for frame allocation is
+ * added in future.
+ */
+
+enum {
+ /**
+ * The maximum number of layers/planes in a DRM frame.
+ */
+ AV_DRM_MAX_PLANES = 4
+};
+
+/**
+ * DRM object descriptor.
+ *
+ * Describes a single DRM object, addressing it as a PRIME file
+ * descriptor.
+ */
+typedef struct AVDRMObjectDescriptor {
+ /**
+ * DRM PRIME fd for the object.
+ */
+ int fd;
+ /**
+ * Total size of the object.
+ *
+ * (This includes any parts not which do not contain image data.)
+ */
+ size_t size;
+ /**
+ * Format modifier applied to the object (DRM_FORMAT_MOD_*).
+ *
+ * If the format modifier is unknown then this should be set to
+ * DRM_FORMAT_MOD_INVALID.
+ */
+ uint64_t format_modifier;
+} AVDRMObjectDescriptor;
+
+/**
+ * DRM plane descriptor.
+ *
+ * Describes a single plane of a layer, which is contained within
+ * a single object.
+ */
+typedef struct AVDRMPlaneDescriptor {
+ /**
+ * Index of the object containing this plane in the objects
+ * array of the enclosing frame descriptor.
+ */
+ int object_index;
+ /**
+ * Offset within that object of this plane.
+ */
+ ptrdiff_t offset;
+ /**
+ * Pitch (linesize) of this plane.
+ */
+ ptrdiff_t pitch;
+} AVDRMPlaneDescriptor;
+
+/**
+ * DRM layer descriptor.
+ *
+ * Describes a single layer within a frame. This has the structure
+ * defined by its format, and will contain one or more planes.
+ */
+typedef struct AVDRMLayerDescriptor {
+ /**
+ * Format of the layer (DRM_FORMAT_*).
+ */
+ uint32_t format;
+ /**
+ * Number of planes in the layer.
+ *
+ * This must match the number of planes required by format.
+ */
+ int nb_planes;
+ /**
+ * Array of planes in this layer.
+ */
+ AVDRMPlaneDescriptor planes[AV_DRM_MAX_PLANES];
+} AVDRMLayerDescriptor;
+
+/**
+ * DRM frame descriptor.
+ *
+ * This is used as the data pointer for AV_PIX_FMT_DRM_PRIME frames.
+ * It is also used by user-allocated frame pools - allocating in
+ * AVHWFramesContext.pool must return AVBufferRefs which contain
+ * an object of this type.
+ *
+ * The fields of this structure should be set such it can be
+ * imported directly by EGL using the EGL_EXT_image_dma_buf_import
+ * and EGL_EXT_image_dma_buf_import_modifiers extensions.
+ * (Note that the exact layout of a particular format may vary between
+ * platforms - we only specify that the same platform should be able
+ * to import it.)
+ *
+ * The total number of planes must not exceed AV_DRM_MAX_PLANES, and
+ * the order of the planes by increasing layer index followed by
+ * increasing plane index must be the same as the order which would
+ * be used for the data pointers in the equivalent software format.
+ */
+typedef struct AVDRMFrameDescriptor {
+ /**
+ * Number of DRM objects making up this frame.
+ */
+ int nb_objects;
+ /**
+ * Array of objects making up the frame.
+ */
+ AVDRMObjectDescriptor objects[AV_DRM_MAX_PLANES];
+ /**
+ * Number of layers in the frame.
+ */
+ int nb_layers;
+ /**
+ * Array of layers in the frame.
+ */
+ AVDRMLayerDescriptor layers[AV_DRM_MAX_PLANES];
+} AVDRMFrameDescriptor;
+
+/**
+ * DRM device.
+ *
+ * Allocated as AVHWDeviceContext.hwctx.
+ */
+typedef struct AVDRMDeviceContext {
+ /**
+ * File descriptor of DRM device.
+ *
+ * This is used as the device to create frames on, and may also be
+ * used in some derivation and mapping operations.
+ *
+ * If no device is required, set to -1.
+ */
+ int fd;
+} AVDRMDeviceContext;
+
+#endif /* AVUTIL_HWCONTEXT_DRM_H */