Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1948 insertions, 0 deletions

diff --git a/media/ffvpx/libavutil/hwcontext_vaapi.c b/media/ffvpx/libavutil/hwcontext_vaapi.c
new file mode 100644
index 0000000000..de30a919ab
--- /dev/null
+++ b/media/ffvpx/libavutil/hwcontext_vaapi.c
@@ -0,0 +1,1948 @@
+/*
+ * 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
+ */
+
+#include "config.h"
+
+#if HAVE_VAAPI_X11
+#   include <va/va_x11.h>
+#endif
+#if HAVE_VAAPI_DRM
+#   include <va/va_drm.h>
+#endif
+
+#if CONFIG_LIBDRM
+#   include <va/va_drmcommon.h>
+#   include <xf86drm.h>
+#   include <drm_fourcc.h>
+#   ifndef DRM_FORMAT_MOD_INVALID
+#       define DRM_FORMAT_MOD_INVALID ((1ULL << 56) - 1)
+#   endif
+#endif
+
+#include <fcntl.h>
+#if HAVE_UNISTD_H
+#   include <unistd.h>
+#endif
+
+
+#include "avassert.h"
+#include "buffer.h"
+#include "common.h"
+#include "hwcontext.h"
+#if CONFIG_LIBDRM
+#include "hwcontext_drm.h"
+#endif
+#include "hwcontext_internal.h"
+#include "hwcontext_vaapi.h"
+#include "mem.h"
+#include "pixdesc.h"
+#include "pixfmt.h"
+
+
+typedef struct VAAPIDevicePriv {
+#if HAVE_VAAPI_X11
+    Display *x11_display;
+#endif
+
+    int drm_fd;
+} VAAPIDevicePriv;
+
+typedef struct VAAPISurfaceFormat {
+    enum AVPixelFormat pix_fmt;
+    VAImageFormat image_format;
+} VAAPISurfaceFormat;
+
+typedef struct VAAPIDeviceContext {
+    // Surface formats which can be used with this device.
+    VAAPISurfaceFormat *formats;
+    int              nb_formats;
+} VAAPIDeviceContext;
+
+typedef struct VAAPIFramesContext {
+    // Surface attributes set at create time.
+    VASurfaceAttrib *attributes;
+    int           nb_attributes;
+    // RT format of the underlying surface (Intel driver ignores this anyway).
+    unsigned int rt_format;
+    // Whether vaDeriveImage works.
+    int derive_works;
+    // Caches whether VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME_2 is unsupported for
+    // surface imports.
+    int prime_2_import_unsupported;
+} VAAPIFramesContext;
+
+typedef struct VAAPIMapping {
+    // Handle to the derived or copied image which is mapped.
+    VAImage image;
+    // The mapping flags actually used.
+    int flags;
+} VAAPIMapping;
+
+typedef struct VAAPIFormat {
+    unsigned int fourcc;
+    unsigned int rt_format;
+    enum AVPixelFormat pix_fmt;
+    int chroma_planes_swapped;
+} VAAPIFormatDescriptor;
+
+#define MAP(va, rt, av, swap_uv) { \
+        VA_FOURCC_ ## va, \
+        VA_RT_FORMAT_ ## rt, \
+        AV_PIX_FMT_ ## av, \
+        swap_uv, \
+    }
+// The map fourcc <-> pix_fmt isn't bijective because of the annoying U/V
+// plane swap cases.  The frame handling below tries to hide these.
+static const VAAPIFormatDescriptor vaapi_format_map[] = {
+    MAP(NV12, YUV420,  NV12,    0),
+#ifdef VA_FOURCC_I420
+    MAP(I420, YUV420,  YUV420P, 0),
+#endif
+    MAP(YV12, YUV420,  YUV420P, 1),
+    MAP(IYUV, YUV420,  YUV420P, 0),
+    MAP(422H, YUV422,  YUV422P, 0),
+#ifdef VA_FOURCC_YV16
+    MAP(YV16, YUV422,  YUV422P, 1),
+#endif
+    MAP(UYVY, YUV422,  UYVY422, 0),
+    MAP(YUY2, YUV422,  YUYV422, 0),
+#ifdef VA_FOURCC_Y210
+    MAP(Y210, YUV422_10,  Y210, 0),
+#endif
+#ifdef VA_FOURCC_Y212
+    MAP(Y212, YUV422_12,  Y212, 0),
+#endif
+    MAP(411P, YUV411,  YUV411P, 0),
+    MAP(422V, YUV422,  YUV440P, 0),
+    MAP(444P, YUV444,  YUV444P, 0),
+#ifdef VA_FOURCC_XYUV
+    MAP(XYUV, YUV444,  VUYX,    0),
+#endif
+    MAP(Y800, YUV400,  GRAY8,   0),
+#ifdef VA_FOURCC_P010
+    MAP(P010, YUV420_10BPP, P010, 0),
+#endif
+#ifdef VA_FOURCC_P012
+    MAP(P012, YUV420_12, P012, 0),
+#endif
+    MAP(BGRA, RGB32,   BGRA, 0),
+    MAP(BGRX, RGB32,   BGR0, 0),
+    MAP(RGBA, RGB32,   RGBA, 0),
+    MAP(RGBX, RGB32,   RGB0, 0),
+#ifdef VA_FOURCC_ABGR
+    MAP(ABGR, RGB32,   ABGR, 0),
+    MAP(XBGR, RGB32,   0BGR, 0),
+#endif
+    MAP(ARGB, RGB32,   ARGB, 0),
+    MAP(XRGB, RGB32,   0RGB, 0),
+#ifdef VA_FOURCC_X2R10G10B10
+    MAP(X2R10G10B10, RGB32_10, X2RGB10, 0),
+#endif
+#ifdef VA_FOURCC_Y410
+    // libva doesn't include a fourcc for XV30 and the driver only declares
+    // support for Y410, so we must fudge the mapping here.
+    MAP(Y410, YUV444_10,  XV30, 0),
+#endif
+#ifdef VA_FOURCC_Y412
+    // libva doesn't include a fourcc for XV36 and the driver only declares
+    // support for Y412, so we must fudge the mapping here.
+    MAP(Y412, YUV444_12,  XV36, 0),
+#endif
+};
+#undef MAP
+
+static const VAAPIFormatDescriptor *
+    vaapi_format_from_fourcc(unsigned int fourcc)
+{
+    int i;
+    for (i = 0; i < FF_ARRAY_ELEMS(vaapi_format_map); i++)
+        if (vaapi_format_map[i].fourcc == fourcc)
+            return &vaapi_format_map[i];
+    return NULL;
+}
+
+static const VAAPIFormatDescriptor *
+    vaapi_format_from_pix_fmt(enum AVPixelFormat pix_fmt)
+{
+    int i;
+    for (i = 0; i < FF_ARRAY_ELEMS(vaapi_format_map); i++)
+        if (vaapi_format_map[i].pix_fmt == pix_fmt)
+            return &vaapi_format_map[i];
+    return NULL;
+}
+
+static enum AVPixelFormat vaapi_pix_fmt_from_fourcc(unsigned int fourcc)
+{
+    const VAAPIFormatDescriptor *desc;
+    desc = vaapi_format_from_fourcc(fourcc);
+    if (desc)
+        return desc->pix_fmt;
+    else
+        return AV_PIX_FMT_NONE;
+}
+
+static int vaapi_get_image_format(AVHWDeviceContext *hwdev,
+                                  enum AVPixelFormat pix_fmt,
+                                  VAImageFormat **image_format)
+{
+    VAAPIDeviceContext *ctx = hwdev->internal->priv;
+    int i;
+
+    for (i = 0; i < ctx->nb_formats; i++) {
+        if (ctx->formats[i].pix_fmt == pix_fmt) {
+            if (image_format)
+                *image_format = &ctx->formats[i].image_format;
+            return 0;
+        }
+    }
+    return AVERROR(EINVAL);
+}
+
+static int vaapi_frames_get_constraints(AVHWDeviceContext *hwdev,
+                                        const void *hwconfig,
+                                        AVHWFramesConstraints *constraints)
+{
+    AVVAAPIDeviceContext *hwctx = hwdev->hwctx;
+    const AVVAAPIHWConfig *config = hwconfig;
+    VAAPIDeviceContext *ctx = hwdev->internal->priv;
+    VASurfaceAttrib *attr_list = NULL;
+    VAStatus vas;
+    enum AVPixelFormat pix_fmt;
+    unsigned int fourcc;
+    int err, i, j, attr_count, pix_fmt_count;
+
+    if (config &&
+        !(hwctx->driver_quirks & AV_VAAPI_DRIVER_QUIRK_SURFACE_ATTRIBUTES)) {
+        attr_count = 0;
+        vas = vaQuerySurfaceAttributes(hwctx->display, config->config_id,
+                                       0, &attr_count);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwdev, AV_LOG_ERROR, "Failed to query surface attributes: "
+                   "%d (%s).\n", vas, vaErrorStr(vas));
+            err = AVERROR(ENOSYS);
+            goto fail;
+        }
+
+        attr_list = av_malloc(attr_count * sizeof(*attr_list));
+        if (!attr_list) {
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        vas = vaQuerySurfaceAttributes(hwctx->display, config->config_id,
+                                       attr_list, &attr_count);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwdev, AV_LOG_ERROR, "Failed to query surface attributes: "
+                   "%d (%s).\n", vas, vaErrorStr(vas));
+            err = AVERROR(ENOSYS);
+            goto fail;
+        }
+
+        pix_fmt_count = 0;
+        for (i = 0; i < attr_count; i++) {
+            switch (attr_list[i].type) {
+            case VASurfaceAttribPixelFormat:
+                fourcc = attr_list[i].value.value.i;
+                pix_fmt = vaapi_pix_fmt_from_fourcc(fourcc);
+                if (pix_fmt != AV_PIX_FMT_NONE) {
+                    ++pix_fmt_count;
+                } else {
+                    // Something unsupported - ignore.
+                }
+                break;
+            case VASurfaceAttribMinWidth:
+                constraints->min_width  = attr_list[i].value.value.i;
+                break;
+            case VASurfaceAttribMinHeight:
+                constraints->min_height = attr_list[i].value.value.i;
+                break;
+            case VASurfaceAttribMaxWidth:
+                constraints->max_width  = attr_list[i].value.value.i;
+                break;
+            case VASurfaceAttribMaxHeight:
+                constraints->max_height = attr_list[i].value.value.i;
+                break;
+            }
+        }
+        if (pix_fmt_count == 0) {
+            // Nothing usable found.  Presumably there exists something which
+            // works, so leave the set null to indicate unknown.
+            constraints->valid_sw_formats = NULL;
+        } else {
+            constraints->valid_sw_formats = av_malloc_array(pix_fmt_count + 1,
+                                                            sizeof(pix_fmt));
+            if (!constraints->valid_sw_formats) {
+                err = AVERROR(ENOMEM);
+                goto fail;
+            }
+
+            for (i = j = 0; i < attr_count; i++) {
+                int k;
+
+                if (attr_list[i].type != VASurfaceAttribPixelFormat)
+                    continue;
+                fourcc = attr_list[i].value.value.i;
+                pix_fmt = vaapi_pix_fmt_from_fourcc(fourcc);
+
+                if (pix_fmt == AV_PIX_FMT_NONE)
+                    continue;
+
+                for (k = 0; k < j; k++) {
+                    if (constraints->valid_sw_formats[k] == pix_fmt)
+                        break;
+                }
+
+                if (k == j)
+                    constraints->valid_sw_formats[j++] = pix_fmt;
+            }
+            constraints->valid_sw_formats[j] = AV_PIX_FMT_NONE;
+        }
+    } else {
+        // No configuration supplied.
+        // Return the full set of image formats known by the implementation.
+        constraints->valid_sw_formats = av_malloc_array(ctx->nb_formats + 1,
+                                                        sizeof(pix_fmt));
+        if (!constraints->valid_sw_formats) {
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+        for (i = j = 0; i < ctx->nb_formats; i++) {
+            int k;
+
+            for (k = 0; k < j; k++) {
+                if (constraints->valid_sw_formats[k] == ctx->formats[i].pix_fmt)
+                    break;
+            }
+
+            if (k == j)
+                constraints->valid_sw_formats[j++] = ctx->formats[i].pix_fmt;
+        }
+
+        constraints->valid_sw_formats[j] = AV_PIX_FMT_NONE;
+    }
+
+    constraints->valid_hw_formats = av_malloc_array(2, sizeof(pix_fmt));
+    if (!constraints->valid_hw_formats) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+    constraints->valid_hw_formats[0] = AV_PIX_FMT_VAAPI;
+    constraints->valid_hw_formats[1] = AV_PIX_FMT_NONE;
+
+    err = 0;
+fail:
+    av_freep(&attr_list);
+    return err;
+}
+
+static const struct {
+    const char *friendly_name;
+    const char *match_string;
+    unsigned int quirks;
+} vaapi_driver_quirks_table[] = {
+#if !VA_CHECK_VERSION(1, 0, 0)
+    // The i965 driver did not conform before version 2.0.
+    {
+        "Intel i965 (Quick Sync)",
+        "i965",
+        AV_VAAPI_DRIVER_QUIRK_RENDER_PARAM_BUFFERS,
+    },
+#endif
+    {
+        "Intel iHD",
+        "ubit",
+        AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE,
+    },
+    {
+        "VDPAU wrapper",
+        "Splitted-Desktop Systems VDPAU backend for VA-API",
+        AV_VAAPI_DRIVER_QUIRK_SURFACE_ATTRIBUTES,
+    },
+};
+
+static int vaapi_device_init(AVHWDeviceContext *hwdev)
+{
+    VAAPIDeviceContext *ctx = hwdev->internal->priv;
+    AVVAAPIDeviceContext *hwctx = hwdev->hwctx;
+    VAImageFormat *image_list = NULL;
+    VAStatus vas;
+    const char *vendor_string;
+    int err, i, image_count;
+    enum AVPixelFormat pix_fmt;
+    unsigned int fourcc;
+
+    image_count = vaMaxNumImageFormats(hwctx->display);
+    if (image_count <= 0) {
+        err = AVERROR(EIO);
+        goto fail;
+    }
+    image_list = av_malloc(image_count * sizeof(*image_list));
+    if (!image_list) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+    vas = vaQueryImageFormats(hwctx->display, image_list, &image_count);
+    if (vas != VA_STATUS_SUCCESS) {
+        err = AVERROR(EIO);
+        goto fail;
+    }
+
+    ctx->formats  = av_malloc(image_count * sizeof(*ctx->formats));
+    if (!ctx->formats) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+    ctx->nb_formats = 0;
+    for (i = 0; i < image_count; i++) {
+        fourcc  = image_list[i].fourcc;
+        pix_fmt = vaapi_pix_fmt_from_fourcc(fourcc);
+        if (pix_fmt == AV_PIX_FMT_NONE) {
+            av_log(hwdev, AV_LOG_DEBUG, "Format %#x -> unknown.\n",
+                   fourcc);
+        } else {
+            av_log(hwdev, AV_LOG_DEBUG, "Format %#x -> %s.\n",
+                   fourcc, av_get_pix_fmt_name(pix_fmt));
+            ctx->formats[ctx->nb_formats].pix_fmt      = pix_fmt;
+            ctx->formats[ctx->nb_formats].image_format = image_list[i];
+            ++ctx->nb_formats;
+        }
+    }
+
+    vendor_string = vaQueryVendorString(hwctx->display);
+    if (vendor_string)
+        av_log(hwdev, AV_LOG_VERBOSE, "VAAPI driver: %s.\n", vendor_string);
+
+    if (hwctx->driver_quirks & AV_VAAPI_DRIVER_QUIRK_USER_SET) {
+        av_log(hwdev, AV_LOG_VERBOSE, "Using quirks set by user (%#x).\n",
+               hwctx->driver_quirks);
+    } else {
+        // Detect the driver in use and set quirk flags if necessary.
+        hwctx->driver_quirks = 0;
+        if (vendor_string) {
+            for (i = 0; i < FF_ARRAY_ELEMS(vaapi_driver_quirks_table); i++) {
+                if (strstr(vendor_string,
+                           vaapi_driver_quirks_table[i].match_string)) {
+                    av_log(hwdev, AV_LOG_VERBOSE, "Matched driver string "
+                           "as known nonstandard driver \"%s\", setting "
+                           "quirks (%#x).\n",
+                           vaapi_driver_quirks_table[i].friendly_name,
+                           vaapi_driver_quirks_table[i].quirks);
+                    hwctx->driver_quirks |=
+                        vaapi_driver_quirks_table[i].quirks;
+                    break;
+                }
+            }
+            if (!(i < FF_ARRAY_ELEMS(vaapi_driver_quirks_table))) {
+                av_log(hwdev, AV_LOG_VERBOSE, "Driver not found in known "
+                       "nonstandard list, using standard behaviour.\n");
+            }
+        } else {
+            av_log(hwdev, AV_LOG_VERBOSE, "Driver has no vendor string, "
+                   "assuming standard behaviour.\n");
+        }
+    }
+
+    av_free(image_list);
+    return 0;
+fail:
+    av_freep(&ctx->formats);
+    av_free(image_list);
+    return err;
+}
+
+static void vaapi_device_uninit(AVHWDeviceContext *hwdev)
+{
+    VAAPIDeviceContext *ctx = hwdev->internal->priv;
+
+    av_freep(&ctx->formats);
+}
+
+static void vaapi_buffer_free(void *opaque, uint8_t *data)
+{
+    AVHWFramesContext     *hwfc = opaque;
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VASurfaceID surface_id;
+    VAStatus vas;
+
+    surface_id = (VASurfaceID)(uintptr_t)data;
+
+    vas = vaDestroySurfaces(hwctx->display, &surface_id, 1);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to destroy surface %#x: "
+               "%d (%s).\n", surface_id, vas, vaErrorStr(vas));
+    }
+}
+
+static AVBufferRef *vaapi_pool_alloc(void *opaque, size_t size)
+{
+    AVHWFramesContext     *hwfc = opaque;
+    VAAPIFramesContext     *ctx = hwfc->internal->priv;
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    AVVAAPIFramesContext  *avfc = hwfc->hwctx;
+    VASurfaceID surface_id;
+    VAStatus vas;
+    AVBufferRef *ref;
+
+    if (hwfc->initial_pool_size > 0 &&
+        avfc->nb_surfaces >= hwfc->initial_pool_size)
+        return NULL;
+
+    vas = vaCreateSurfaces(hwctx->display, ctx->rt_format,
+                           hwfc->width, hwfc->height,
+                           &surface_id, 1,
+                           ctx->attributes, ctx->nb_attributes);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to create surface: "
+               "%d (%s).\n", vas, vaErrorStr(vas));
+        return NULL;
+    }
+    av_log(hwfc, AV_LOG_DEBUG, "Created surface %#x.\n", surface_id);
+
+    ref = av_buffer_create((uint8_t*)(uintptr_t)surface_id,
+                           sizeof(surface_id), &vaapi_buffer_free,
+                           hwfc, AV_BUFFER_FLAG_READONLY);
+    if (!ref) {
+        vaDestroySurfaces(hwctx->display, &surface_id, 1);
+        return NULL;
+    }
+
+    if (hwfc->initial_pool_size > 0) {
+        // This is a fixed-size pool, so we must still be in the initial
+        // allocation sequence.
+        av_assert0(avfc->nb_surfaces < hwfc->initial_pool_size);
+        avfc->surface_ids[avfc->nb_surfaces] = surface_id;
+        ++avfc->nb_surfaces;
+    }
+
+    return ref;
+}
+
+static int vaapi_frames_init(AVHWFramesContext *hwfc)
+{
+    AVVAAPIFramesContext  *avfc = hwfc->hwctx;
+    VAAPIFramesContext     *ctx = hwfc->internal->priv;
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    const VAAPIFormatDescriptor *desc;
+    VAImageFormat *expected_format;
+    AVBufferRef *test_surface = NULL;
+    VASurfaceID test_surface_id;
+    VAImage test_image;
+    VAStatus vas;
+    int err, i;
+
+    desc = vaapi_format_from_pix_fmt(hwfc->sw_format);
+    if (!desc) {
+        av_log(hwfc, AV_LOG_ERROR, "Unsupported format: %s.\n",
+               av_get_pix_fmt_name(hwfc->sw_format));
+        return AVERROR(EINVAL);
+    }
+
+    if (!hwfc->pool) {
+        if (!(hwctx->driver_quirks & AV_VAAPI_DRIVER_QUIRK_SURFACE_ATTRIBUTES)) {
+            int need_memory_type = !(hwctx->driver_quirks & AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE);
+            int need_pixel_format = 1;
+            for (i = 0; i < avfc->nb_attributes; i++) {
+                if (avfc->attributes[i].type == VASurfaceAttribMemoryType)
+                    need_memory_type  = 0;
+                if (avfc->attributes[i].type == VASurfaceAttribPixelFormat)
+                    need_pixel_format = 0;
+            }
+            ctx->nb_attributes =
+                avfc->nb_attributes + need_memory_type + need_pixel_format;
+
+            ctx->attributes = av_malloc(ctx->nb_attributes *
+                                        sizeof(*ctx->attributes));
+            if (!ctx->attributes) {
+                err = AVERROR(ENOMEM);
+                goto fail;
+            }
+
+            for (i = 0; i < avfc->nb_attributes; i++)
+                ctx->attributes[i] = avfc->attributes[i];
+            if (need_memory_type) {
+                ctx->attributes[i++] = (VASurfaceAttrib) {
+                    .type          = VASurfaceAttribMemoryType,
+                    .flags         = VA_SURFACE_ATTRIB_SETTABLE,
+                    .value.type    = VAGenericValueTypeInteger,
+                    .value.value.i = VA_SURFACE_ATTRIB_MEM_TYPE_VA,
+                };
+            }
+            if (need_pixel_format) {
+                ctx->attributes[i++] = (VASurfaceAttrib) {
+                    .type          = VASurfaceAttribPixelFormat,
+                    .flags         = VA_SURFACE_ATTRIB_SETTABLE,
+                    .value.type    = VAGenericValueTypeInteger,
+                    .value.value.i = desc->fourcc,
+                };
+            }
+            av_assert0(i == ctx->nb_attributes);
+        } else {
+            ctx->attributes = NULL;
+            ctx->nb_attributes = 0;
+        }
+
+        ctx->rt_format = desc->rt_format;
+
+        if (hwfc->initial_pool_size > 0) {
+            // This pool will be usable as a render target, so we need to store
+            // all of the surface IDs somewhere that vaCreateContext() calls
+            // will be able to access them.
+            avfc->nb_surfaces = 0;
+            avfc->surface_ids = av_malloc(hwfc->initial_pool_size *
+                                          sizeof(*avfc->surface_ids));
+            if (!avfc->surface_ids) {
+                err = AVERROR(ENOMEM);
+                goto fail;
+            }
+        } else {
+            // This pool allows dynamic sizing, and will not be usable as a
+            // render target.
+            avfc->nb_surfaces = 0;
+            avfc->surface_ids = NULL;
+        }
+
+        hwfc->internal->pool_internal =
+            av_buffer_pool_init2(sizeof(VASurfaceID), hwfc,
+                                 &vaapi_pool_alloc, NULL);
+        if (!hwfc->internal->pool_internal) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to create VAAPI surface pool.\n");
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+    }
+
+    // Allocate a single surface to test whether vaDeriveImage() is going
+    // to work for the specific configuration.
+    if (hwfc->pool) {
+        test_surface = av_buffer_pool_get(hwfc->pool);
+        if (!test_surface) {
+            av_log(hwfc, AV_LOG_ERROR, "Unable to allocate a surface from "
+                   "user-configured buffer pool.\n");
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+    } else {
+        test_surface = av_buffer_pool_get(hwfc->internal->pool_internal);
+        if (!test_surface) {
+            av_log(hwfc, AV_LOG_ERROR, "Unable to allocate a surface from "
+                   "internal buffer pool.\n");
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+    }
+    test_surface_id = (VASurfaceID)(uintptr_t)test_surface->data;
+
+    ctx->derive_works = 0;
+
+    err = vaapi_get_image_format(hwfc->device_ctx,
+                                 hwfc->sw_format, &expected_format);
+    if (err == 0) {
+        vas = vaDeriveImage(hwctx->display, test_surface_id, &test_image);
+        if (vas == VA_STATUS_SUCCESS) {
+            if (expected_format->fourcc == test_image.format.fourcc) {
+                av_log(hwfc, AV_LOG_DEBUG, "Direct mapping possible.\n");
+                ctx->derive_works = 1;
+            } else {
+                av_log(hwfc, AV_LOG_DEBUG, "Direct mapping disabled: "
+                       "derived image format %08x does not match "
+                       "expected format %08x.\n",
+                       expected_format->fourcc, test_image.format.fourcc);
+            }
+            vaDestroyImage(hwctx->display, test_image.image_id);
+        } else {
+            av_log(hwfc, AV_LOG_DEBUG, "Direct mapping disabled: "
+                   "deriving image does not work: "
+                   "%d (%s).\n", vas, vaErrorStr(vas));
+        }
+    } else {
+        av_log(hwfc, AV_LOG_DEBUG, "Direct mapping disabled: "
+               "image format is not supported.\n");
+    }
+
+    av_buffer_unref(&test_surface);
+    return 0;
+
+fail:
+    av_buffer_unref(&test_surface);
+    av_freep(&avfc->surface_ids);
+    av_freep(&ctx->attributes);
+    return err;
+}
+
+static void vaapi_frames_uninit(AVHWFramesContext *hwfc)
+{
+    AVVAAPIFramesContext *avfc = hwfc->hwctx;
+    VAAPIFramesContext    *ctx = hwfc->internal->priv;
+
+    av_freep(&avfc->surface_ids);
+    av_freep(&ctx->attributes);
+}
+
+static int vaapi_get_buffer(AVHWFramesContext *hwfc, AVFrame *frame)
+{
+    frame->buf[0] = av_buffer_pool_get(hwfc->pool);
+    if (!frame->buf[0])
+        return AVERROR(ENOMEM);
+
+    frame->data[3] = frame->buf[0]->data;
+    frame->format  = AV_PIX_FMT_VAAPI;
+    frame->width   = hwfc->width;
+    frame->height  = hwfc->height;
+
+    return 0;
+}
+
+static int vaapi_transfer_get_formats(AVHWFramesContext *hwfc,
+                                      enum AVHWFrameTransferDirection dir,
+                                      enum AVPixelFormat **formats)
+{
+    VAAPIDeviceContext *ctx = hwfc->device_ctx->internal->priv;
+    enum AVPixelFormat *pix_fmts;
+    int i, k, sw_format_available;
+
+    sw_format_available = 0;
+    for (i = 0; i < ctx->nb_formats; i++) {
+        if (ctx->formats[i].pix_fmt == hwfc->sw_format)
+            sw_format_available = 1;
+    }
+
+    pix_fmts = av_malloc((ctx->nb_formats + 1) * sizeof(*pix_fmts));
+    if (!pix_fmts)
+        return AVERROR(ENOMEM);
+
+    if (sw_format_available) {
+        pix_fmts[0] = hwfc->sw_format;
+        k = 1;
+    } else {
+        k = 0;
+    }
+    for (i = 0; i < ctx->nb_formats; i++) {
+        if (ctx->formats[i].pix_fmt == hwfc->sw_format)
+            continue;
+        av_assert0(k < ctx->nb_formats);
+        pix_fmts[k++] = ctx->formats[i].pix_fmt;
+    }
+    pix_fmts[k] = AV_PIX_FMT_NONE;
+
+    *formats = pix_fmts;
+    return 0;
+}
+
+static void vaapi_unmap_frame(AVHWFramesContext *hwfc,
+                              HWMapDescriptor *hwmap)
+{
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VAAPIMapping           *map = hwmap->priv;
+    VASurfaceID surface_id;
+    VAStatus vas;
+
+    surface_id = (VASurfaceID)(uintptr_t)hwmap->source->data[3];
+    av_log(hwfc, AV_LOG_DEBUG, "Unmap surface %#x.\n", surface_id);
+
+    vas = vaUnmapBuffer(hwctx->display, map->image.buf);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to unmap image from surface "
+               "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+    }
+
+    if ((map->flags & AV_HWFRAME_MAP_WRITE) &&
+        !(map->flags & AV_HWFRAME_MAP_DIRECT)) {
+        vas = vaPutImage(hwctx->display, surface_id, map->image.image_id,
+                         0, 0, hwfc->width, hwfc->height,
+                         0, 0, hwfc->width, hwfc->height);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to write image to surface "
+                   "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+        }
+    }
+
+    vas = vaDestroyImage(hwctx->display, map->image.image_id);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to destroy image from surface "
+               "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+    }
+
+    av_free(map);
+}
+
+static int vaapi_map_frame(AVHWFramesContext *hwfc,
+                           AVFrame *dst, const AVFrame *src, int flags)
+{
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VAAPIFramesContext *ctx = hwfc->internal->priv;
+    VASurfaceID surface_id;
+    const VAAPIFormatDescriptor *desc;
+    VAImageFormat *image_format;
+    VAAPIMapping *map;
+    VAStatus vas;
+    void *address = NULL;
+    int err, i;
+
+    surface_id = (VASurfaceID)(uintptr_t)src->data[3];
+    av_log(hwfc, AV_LOG_DEBUG, "Map surface %#x.\n", surface_id);
+
+    if (!ctx->derive_works && (flags & AV_HWFRAME_MAP_DIRECT)) {
+        // Requested direct mapping but it is not possible.
+        return AVERROR(EINVAL);
+    }
+    if (dst->format == AV_PIX_FMT_NONE)
+        dst->format = hwfc->sw_format;
+    if (dst->format != hwfc->sw_format && (flags & AV_HWFRAME_MAP_DIRECT)) {
+        // Requested direct mapping but the formats do not match.
+        return AVERROR(EINVAL);
+    }
+
+    err = vaapi_get_image_format(hwfc->device_ctx, dst->format, &image_format);
+    if (err < 0) {
+        // Requested format is not a valid output format.
+        return AVERROR(EINVAL);
+    }
+
+    map = av_malloc(sizeof(*map));
+    if (!map)
+        return AVERROR(ENOMEM);
+    map->flags = flags;
+    map->image.image_id = VA_INVALID_ID;
+
+    vas = vaSyncSurface(hwctx->display, surface_id);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to sync surface "
+               "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+        err = AVERROR(EIO);
+        goto fail;
+    }
+
+    // The memory which we map using derive need not be connected to the CPU
+    // in a way conducive to fast access.  On Gen7-Gen9 Intel graphics, the
+    // memory is mappable but not cached, so normal memcpy()-like access is
+    // very slow to read it (but writing is ok).  It is possible to read much
+    // faster with a copy routine which is aware of the limitation, but we
+    // assume for now that the user is not aware of that and would therefore
+    // prefer not to be given direct-mapped memory if they request read access.
+    if (ctx->derive_works && dst->format == hwfc->sw_format &&
+        ((flags & AV_HWFRAME_MAP_DIRECT) || !(flags & AV_HWFRAME_MAP_READ))) {
+        vas = vaDeriveImage(hwctx->display, surface_id, &map->image);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to derive image from "
+                   "surface %#x: %d (%s).\n",
+                   surface_id, vas, vaErrorStr(vas));
+            err = AVERROR(EIO);
+            goto fail;
+        }
+        if (map->image.format.fourcc != image_format->fourcc) {
+            av_log(hwfc, AV_LOG_ERROR, "Derive image of surface %#x "
+                   "is in wrong format: expected %#08x, got %#08x.\n",
+                   surface_id, image_format->fourcc, map->image.format.fourcc);
+            err = AVERROR(EIO);
+            goto fail;
+        }
+        map->flags |= AV_HWFRAME_MAP_DIRECT;
+    } else {
+        vas = vaCreateImage(hwctx->display, image_format,
+                            hwfc->width, hwfc->height, &map->image);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to create image for "
+                   "surface %#x: %d (%s).\n",
+                   surface_id, vas, vaErrorStr(vas));
+            err = AVERROR(EIO);
+            goto fail;
+        }
+        if (!(flags & AV_HWFRAME_MAP_OVERWRITE)) {
+            vas = vaGetImage(hwctx->display, surface_id, 0, 0,
+                             hwfc->width, hwfc->height, map->image.image_id);
+            if (vas != VA_STATUS_SUCCESS) {
+                av_log(hwfc, AV_LOG_ERROR, "Failed to read image from "
+                       "surface %#x: %d (%s).\n",
+                       surface_id, vas, vaErrorStr(vas));
+                err = AVERROR(EIO);
+                goto fail;
+            }
+        }
+    }
+
+    vas = vaMapBuffer(hwctx->display, map->image.buf, &address);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to map image from surface "
+               "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+        err = AVERROR(EIO);
+        goto fail;
+    }
+
+    err = ff_hwframe_map_create(src->hw_frames_ctx,
+                                dst, src, &vaapi_unmap_frame, map);
+    if (err < 0)
+        goto fail;
+
+    dst->width  = src->width;
+    dst->height = src->height;
+
+    for (i = 0; i < map->image.num_planes; i++) {
+        dst->data[i] = (uint8_t*)address + map->image.offsets[i];
+        dst->linesize[i] = map->image.pitches[i];
+    }
+
+    desc = vaapi_format_from_fourcc(map->image.format.fourcc);
+    if (desc && desc->chroma_planes_swapped) {
+        // Chroma planes are YVU rather than YUV, so swap them.
+        FFSWAP(uint8_t*, dst->data[1], dst->data[2]);
+    }
+
+    return 0;
+
+fail:
+    if (map) {
+        if (address)
+            vaUnmapBuffer(hwctx->display, map->image.buf);
+        if (map->image.image_id != VA_INVALID_ID)
+            vaDestroyImage(hwctx->display, map->image.image_id);
+        av_free(map);
+    }
+    return err;
+}
+
+static int vaapi_transfer_data_from(AVHWFramesContext *hwfc,
+                                    AVFrame *dst, const AVFrame *src)
+{
+    AVFrame *map;
+    int err;
+
+    if (dst->width > hwfc->width || dst->height > hwfc->height)
+        return AVERROR(EINVAL);
+
+    map = av_frame_alloc();
+    if (!map)
+        return AVERROR(ENOMEM);
+    map->format = dst->format;
+
+    err = vaapi_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
+    if (err)
+        goto fail;
+
+    map->width  = dst->width;
+    map->height = dst->height;
+
+    err = av_frame_copy(dst, map);
+    if (err)
+        goto fail;
+
+    err = 0;
+fail:
+    av_frame_free(&map);
+    return err;
+}
+
+static int vaapi_transfer_data_to(AVHWFramesContext *hwfc,
+                                  AVFrame *dst, const AVFrame *src)
+{
+    AVFrame *map;
+    int err;
+
+    if (src->width > hwfc->width || src->height > hwfc->height)
+        return AVERROR(EINVAL);
+
+    map = av_frame_alloc();
+    if (!map)
+        return AVERROR(ENOMEM);
+    map->format = src->format;
+
+    err = vaapi_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE | AV_HWFRAME_MAP_OVERWRITE);
+    if (err)
+        goto fail;
+
+    map->width  = src->width;
+    map->height = src->height;
+
+    err = av_frame_copy(map, src);
+    if (err)
+        goto fail;
+
+    err = 0;
+fail:
+    av_frame_free(&map);
+    return err;
+}
+
+static int vaapi_map_to_memory(AVHWFramesContext *hwfc, AVFrame *dst,
+                               const AVFrame *src, int flags)
+{
+    int err;
+
+    if (dst->format != AV_PIX_FMT_NONE) {
+        err = vaapi_get_image_format(hwfc->device_ctx, dst->format, NULL);
+        if (err < 0)
+            return AVERROR(ENOSYS);
+    }
+
+    err = vaapi_map_frame(hwfc, dst, src, flags);
+    if (err)
+        return err;
+
+    err = av_frame_copy_props(dst, src);
+    if (err)
+        return err;
+
+    return 0;
+}
+
+#if CONFIG_LIBDRM
+
+#define DRM_MAP(va, layers, ...) { \
+        VA_FOURCC_ ## va, \
+        layers, \
+        { __VA_ARGS__ } \
+    }
+static const struct {
+    uint32_t va_fourcc;
+    int   nb_layer_formats;
+    uint32_t layer_formats[AV_DRM_MAX_PLANES];
+} vaapi_drm_format_map[] = {
+#ifdef DRM_FORMAT_R8
+    DRM_MAP(NV12, 2, DRM_FORMAT_R8,  DRM_FORMAT_RG88),
+    DRM_MAP(NV12, 2, DRM_FORMAT_R8,  DRM_FORMAT_GR88),
+#endif
+    DRM_MAP(NV12, 1, DRM_FORMAT_NV12),
+#if defined(VA_FOURCC_P010) && defined(DRM_FORMAT_R16)
+    DRM_MAP(P010, 2, DRM_FORMAT_R16, DRM_FORMAT_RG1616),
+#endif
+#if defined(VA_FOURCC_P012) && defined(DRM_FORMAT_R16)
+    DRM_MAP(P012, 2, DRM_FORMAT_R16, DRM_FORMAT_RG1616),
+#endif
+    DRM_MAP(BGRA, 1, DRM_FORMAT_ARGB8888),
+    DRM_MAP(BGRX, 1, DRM_FORMAT_XRGB8888),
+    DRM_MAP(RGBA, 1, DRM_FORMAT_ABGR8888),
+    DRM_MAP(RGBX, 1, DRM_FORMAT_XBGR8888),
+#ifdef VA_FOURCC_ABGR
+    DRM_MAP(ABGR, 1, DRM_FORMAT_RGBA8888),
+    DRM_MAP(XBGR, 1, DRM_FORMAT_RGBX8888),
+#endif
+    DRM_MAP(ARGB, 1, DRM_FORMAT_BGRA8888),
+    DRM_MAP(XRGB, 1, DRM_FORMAT_BGRX8888),
+#if defined(VA_FOURCC_XYUV) && defined(DRM_FORMAT_XYUV8888)
+    DRM_MAP(XYUV, 1, DRM_FORMAT_XYUV8888),
+#endif
+#if defined(VA_FOURCC_Y412) && defined(DRM_FORMAT_XVYU2101010)
+    DRM_MAP(Y410, 1, DRM_FORMAT_XVYU2101010),
+#endif
+#if defined(VA_FOURCC_Y412) && defined(DRM_FORMAT_XVYU12_16161616)
+    DRM_MAP(Y412, 1, DRM_FORMAT_XVYU12_16161616),
+#endif
+};
+#undef DRM_MAP
+
+static void vaapi_unmap_from_drm(AVHWFramesContext *dst_fc,
+                                 HWMapDescriptor *hwmap)
+{
+    AVVAAPIDeviceContext *dst_dev = dst_fc->device_ctx->hwctx;
+
+    VASurfaceID surface_id = (VASurfaceID)(uintptr_t)hwmap->priv;
+
+    av_log(dst_fc, AV_LOG_DEBUG, "Destroy surface %#x.\n", surface_id);
+
+    vaDestroySurfaces(dst_dev->display, &surface_id, 1);
+}
+
+static int vaapi_map_from_drm(AVHWFramesContext *src_fc, AVFrame *dst,
+                              const AVFrame *src, int flags)
+{
+#if VA_CHECK_VERSION(1, 1, 0)
+    VAAPIFramesContext     *src_vafc = src_fc->internal->priv;
+    int use_prime2;
+#else
+    int k;
+#endif
+    AVHWFramesContext      *dst_fc =
+        (AVHWFramesContext*)dst->hw_frames_ctx->data;
+    AVVAAPIDeviceContext  *dst_dev = dst_fc->device_ctx->hwctx;
+    const AVDRMFrameDescriptor *desc;
+    const VAAPIFormatDescriptor *format_desc;
+    VASurfaceID surface_id;
+    VAStatus vas = VA_STATUS_SUCCESS;
+    uint32_t va_fourcc;
+    int err, i, j;
+
+#if !VA_CHECK_VERSION(1, 1, 0)
+    unsigned long buffer_handle;
+    VASurfaceAttribExternalBuffers buffer_desc;
+    VASurfaceAttrib attrs[2] = {
+        {
+            .type  = VASurfaceAttribMemoryType,
+            .flags = VA_SURFACE_ATTRIB_SETTABLE,
+            .value.type    = VAGenericValueTypeInteger,
+            .value.value.i = VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME,
+        },
+        {
+            .type  = VASurfaceAttribExternalBufferDescriptor,
+            .flags = VA_SURFACE_ATTRIB_SETTABLE,
+            .value.type    = VAGenericValueTypePointer,
+            .value.value.p = &buffer_desc,
+        }
+    };
+#endif
+
+    desc = (AVDRMFrameDescriptor*)src->data[0];
+
+    if (desc->nb_objects != 1) {
+        av_log(dst_fc, AV_LOG_ERROR, "VAAPI can only map frames "
+               "made from a single DRM object.\n");
+        return AVERROR(EINVAL);
+    }
+
+    va_fourcc = 0;
+    for (i = 0; i < FF_ARRAY_ELEMS(vaapi_drm_format_map); i++) {
+        if (desc->nb_layers != vaapi_drm_format_map[i].nb_layer_formats)
+            continue;
+        for (j = 0; j < desc->nb_layers; j++) {
+            if (desc->layers[j].format !=
+                vaapi_drm_format_map[i].layer_formats[j])
+                break;
+        }
+        if (j != desc->nb_layers)
+            continue;
+        va_fourcc = vaapi_drm_format_map[i].va_fourcc;
+        break;
+    }
+    if (!va_fourcc) {
+        av_log(dst_fc, AV_LOG_ERROR, "DRM format not supported "
+               "by VAAPI.\n");
+        return AVERROR(EINVAL);
+    }
+
+    av_log(dst_fc, AV_LOG_DEBUG, "Map DRM object %d to VAAPI as "
+           "%08x.\n", desc->objects[0].fd, va_fourcc);
+
+    format_desc = vaapi_format_from_fourcc(va_fourcc);
+    av_assert0(format_desc);
+
+#if VA_CHECK_VERSION(1, 1, 0)
+    use_prime2 = !src_vafc->prime_2_import_unsupported &&
+                 desc->objects[0].format_modifier != DRM_FORMAT_MOD_INVALID;
+    if (use_prime2) {
+        VADRMPRIMESurfaceDescriptor prime_desc;
+        VASurfaceAttrib prime_attrs[2] = {
+            {
+                .type  = VASurfaceAttribMemoryType,
+                .flags = VA_SURFACE_ATTRIB_SETTABLE,
+                .value.type    = VAGenericValueTypeInteger,
+                .value.value.i = VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME_2,
+            },
+            {
+                .type  = VASurfaceAttribExternalBufferDescriptor,
+                .flags = VA_SURFACE_ATTRIB_SETTABLE,
+                .value.type    = VAGenericValueTypePointer,
+                .value.value.p = &prime_desc,
+            }
+        };
+        prime_desc.fourcc = va_fourcc;
+        prime_desc.width = src_fc->width;
+        prime_desc.height = src_fc->height;
+        prime_desc.num_objects = desc->nb_objects;
+        for (i = 0; i < desc->nb_objects; ++i) {
+            prime_desc.objects[i].fd = desc->objects[i].fd;
+            prime_desc.objects[i].size = desc->objects[i].size;
+            prime_desc.objects[i].drm_format_modifier =
+                    desc->objects[i].format_modifier;
+        }
+
+        prime_desc.num_layers = desc->nb_layers;
+        for (i = 0; i < desc->nb_layers; ++i) {
+            prime_desc.layers[i].drm_format = desc->layers[i].format;
+            prime_desc.layers[i].num_planes = desc->layers[i].nb_planes;
+            for (j = 0; j < desc->layers[i].nb_planes; ++j) {
+                prime_desc.layers[i].object_index[j] =
+                        desc->layers[i].planes[j].object_index;
+                prime_desc.layers[i].offset[j] = desc->layers[i].planes[j].offset;
+                prime_desc.layers[i].pitch[j] = desc->layers[i].planes[j].pitch;
+            }
+
+            if (format_desc->chroma_planes_swapped &&
+                desc->layers[i].nb_planes == 3) {
+                FFSWAP(uint32_t, prime_desc.layers[i].pitch[1],
+                    prime_desc.layers[i].pitch[2]);
+                FFSWAP(uint32_t, prime_desc.layers[i].offset[1],
+                    prime_desc.layers[i].offset[2]);
+            }
+        }
+
+        /*
+         * We can query for PRIME_2 support with vaQuerySurfaceAttributes, but that
+         * that needs the config_id which we don't have here . Both Intel and
+         * Gallium seem to do the correct error checks, so lets just try the
+         * PRIME_2 import first.
+         */
+        vas = vaCreateSurfaces(dst_dev->display, format_desc->rt_format,
+                               src->width, src->height, &surface_id, 1,
+                               prime_attrs, FF_ARRAY_ELEMS(prime_attrs));
+        if (vas != VA_STATUS_SUCCESS)
+            src_vafc->prime_2_import_unsupported = 1;
+    }
+
+    if (!use_prime2 || vas != VA_STATUS_SUCCESS) {
+        int k;
+        unsigned long buffer_handle;
+        VASurfaceAttribExternalBuffers buffer_desc;
+        VASurfaceAttrib buffer_attrs[2] = {
+            {
+                .type  = VASurfaceAttribMemoryType,
+                .flags = VA_SURFACE_ATTRIB_SETTABLE,
+                .value.type    = VAGenericValueTypeInteger,
+                .value.value.i = VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME,
+            },
+            {
+                .type  = VASurfaceAttribExternalBufferDescriptor,
+                .flags = VA_SURFACE_ATTRIB_SETTABLE,
+                .value.type    = VAGenericValueTypePointer,
+                .value.value.p = &buffer_desc,
+            }
+        };
+
+        buffer_handle = desc->objects[0].fd;
+        buffer_desc.pixel_format = va_fourcc;
+        buffer_desc.width        = src_fc->width;
+        buffer_desc.height       = src_fc->height;
+        buffer_desc.data_size    = desc->objects[0].size;
+        buffer_desc.buffers      = &buffer_handle;
+        buffer_desc.num_buffers  = 1;
+        buffer_desc.flags        = 0;
+
+        k = 0;
+        for (i = 0; i < desc->nb_layers; i++) {
+            for (j = 0; j < desc->layers[i].nb_planes; j++) {
+                buffer_desc.pitches[k] = desc->layers[i].planes[j].pitch;
+                buffer_desc.offsets[k] = desc->layers[i].planes[j].offset;
+                ++k;
+            }
+        }
+        buffer_desc.num_planes = k;
+
+        if (format_desc->chroma_planes_swapped &&
+            buffer_desc.num_planes == 3) {
+            FFSWAP(uint32_t, buffer_desc.pitches[1], buffer_desc.pitches[2]);
+            FFSWAP(uint32_t, buffer_desc.offsets[1], buffer_desc.offsets[2]);
+        }
+
+        vas = vaCreateSurfaces(dst_dev->display, format_desc->rt_format,
+                               src->width, src->height,
+                               &surface_id, 1,
+                               buffer_attrs, FF_ARRAY_ELEMS(buffer_attrs));
+    }
+#else
+    buffer_handle = desc->objects[0].fd;
+    buffer_desc.pixel_format = va_fourcc;
+    buffer_desc.width        = src_fc->width;
+    buffer_desc.height       = src_fc->height;
+    buffer_desc.data_size    = desc->objects[0].size;
+    buffer_desc.buffers      = &buffer_handle;
+    buffer_desc.num_buffers  = 1;
+    buffer_desc.flags        = 0;
+
+    k = 0;
+    for (i = 0; i < desc->nb_layers; i++) {
+        for (j = 0; j < desc->layers[i].nb_planes; j++) {
+            buffer_desc.pitches[k] = desc->layers[i].planes[j].pitch;
+            buffer_desc.offsets[k] = desc->layers[i].planes[j].offset;
+            ++k;
+        }
+    }
+    buffer_desc.num_planes = k;
+
+    if (format_desc->chroma_planes_swapped &&
+        buffer_desc.num_planes == 3) {
+        FFSWAP(uint32_t, buffer_desc.pitches[1], buffer_desc.pitches[2]);
+        FFSWAP(uint32_t, buffer_desc.offsets[1], buffer_desc.offsets[2]);
+    }
+
+    vas = vaCreateSurfaces(dst_dev->display, format_desc->rt_format,
+                           src->width, src->height,
+                           &surface_id, 1,
+                           attrs, FF_ARRAY_ELEMS(attrs));
+#endif
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(dst_fc, AV_LOG_ERROR, "Failed to create surface from DRM "
+               "object: %d (%s).\n", vas, vaErrorStr(vas));
+        return AVERROR(EIO);
+    }
+    av_log(dst_fc, AV_LOG_DEBUG, "Create surface %#x.\n", surface_id);
+
+    err = ff_hwframe_map_create(dst->hw_frames_ctx, dst, src,
+                                &vaapi_unmap_from_drm,
+                                (void*)(uintptr_t)surface_id);
+    if (err < 0)
+        return err;
+
+    dst->width   = src->width;
+    dst->height  = src->height;
+    dst->data[3] = (uint8_t*)(uintptr_t)surface_id;
+
+    av_log(dst_fc, AV_LOG_DEBUG, "Mapped DRM object %d to "
+           "surface %#x.\n", desc->objects[0].fd, surface_id);
+
+    return 0;
+}
+
+#if VA_CHECK_VERSION(1, 1, 0)
+static void vaapi_unmap_to_drm_esh(AVHWFramesContext *hwfc,
+                                   HWMapDescriptor *hwmap)
+{
+    AVDRMFrameDescriptor *drm_desc = hwmap->priv;
+    int i;
+
+    for (i = 0; i < drm_desc->nb_objects; i++)
+        close(drm_desc->objects[i].fd);
+
+    av_freep(&drm_desc);
+}
+
+static int vaapi_map_to_drm_esh(AVHWFramesContext *hwfc, AVFrame *dst,
+                                const AVFrame *src, int flags)
+{
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VASurfaceID surface_id;
+    VAStatus vas;
+    VADRMPRIMESurfaceDescriptor va_desc;
+    AVDRMFrameDescriptor *drm_desc = NULL;
+    uint32_t export_flags;
+    int err, i, j;
+
+    surface_id = (VASurfaceID)(uintptr_t)src->data[3];
+
+    export_flags = VA_EXPORT_SURFACE_SEPARATE_LAYERS;
+    if (flags & AV_HWFRAME_MAP_READ) {
+        export_flags |= VA_EXPORT_SURFACE_READ_ONLY;
+
+        vas = vaSyncSurface(hwctx->display, surface_id);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to sync surface "
+                   "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
+            return AVERROR(EIO);
+        }
+    }
+
+    if (flags & AV_HWFRAME_MAP_WRITE)
+        export_flags |= VA_EXPORT_SURFACE_WRITE_ONLY;
+
+    vas = vaExportSurfaceHandle(hwctx->display, surface_id,
+                                VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME_2,
+                                export_flags, &va_desc);
+    if (vas != VA_STATUS_SUCCESS) {
+        if (vas == VA_STATUS_ERROR_UNIMPLEMENTED)
+            return AVERROR(ENOSYS);
+        av_log(hwfc, AV_LOG_ERROR, "Failed to export surface %#x: "
+               "%d (%s).\n", surface_id, vas, vaErrorStr(vas));
+        return AVERROR(EIO);
+    }
+
+    drm_desc = av_mallocz(sizeof(*drm_desc));
+    if (!drm_desc) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    // By some bizarre coincidence, these structures are very similar...
+    drm_desc->nb_objects = va_desc.num_objects;
+    for (i = 0; i < va_desc.num_objects; i++) {
+        drm_desc->objects[i].fd   = va_desc.objects[i].fd;
+        drm_desc->objects[i].size = va_desc.objects[i].size;
+        drm_desc->objects[i].format_modifier =
+            va_desc.objects[i].drm_format_modifier;
+    }
+    drm_desc->nb_layers = va_desc.num_layers;
+    for (i = 0; i < va_desc.num_layers; i++) {
+        drm_desc->layers[i].format    = va_desc.layers[i].drm_format;
+        drm_desc->layers[i].nb_planes = va_desc.layers[i].num_planes;
+        for (j = 0; j < va_desc.layers[i].num_planes; j++) {
+            drm_desc->layers[i].planes[j].object_index =
+                va_desc.layers[i].object_index[j];
+            drm_desc->layers[i].planes[j].offset =
+                va_desc.layers[i].offset[j];
+            drm_desc->layers[i].planes[j].pitch =
+                va_desc.layers[i].pitch[j];
+        }
+    }
+
+    err = ff_hwframe_map_create(src->hw_frames_ctx, dst, src,
+                                &vaapi_unmap_to_drm_esh, drm_desc);
+    if (err < 0)
+        goto fail;
+
+    dst->width   = src->width;
+    dst->height  = src->height;
+    dst->data[0] = (uint8_t*)drm_desc;
+
+    return 0;
+
+fail:
+    for (i = 0; i < va_desc.num_objects; i++)
+        close(va_desc.objects[i].fd);
+    av_freep(&drm_desc);
+    return err;
+}
+#endif
+
+#if VA_CHECK_VERSION(0, 36, 0)
+typedef struct VAAPIDRMImageBufferMapping {
+    VAImage      image;
+    VABufferInfo buffer_info;
+
+    AVDRMFrameDescriptor drm_desc;
+} VAAPIDRMImageBufferMapping;
+
+static void vaapi_unmap_to_drm_abh(AVHWFramesContext *hwfc,
+                                  HWMapDescriptor *hwmap)
+{
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VAAPIDRMImageBufferMapping *mapping = hwmap->priv;
+    VASurfaceID surface_id;
+    VAStatus vas;
+
+    surface_id = (VASurfaceID)(uintptr_t)hwmap->source->data[3];
+    av_log(hwfc, AV_LOG_DEBUG, "Unmap VAAPI surface %#x from DRM.\n",
+           surface_id);
+
+    // DRM PRIME file descriptors are closed by vaReleaseBufferHandle(),
+    // so we shouldn't close them separately.
+
+    vas = vaReleaseBufferHandle(hwctx->display, mapping->image.buf);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to release buffer "
+               "handle of image %#x (derived from surface %#x): "
+               "%d (%s).\n", mapping->image.buf, surface_id,
+               vas, vaErrorStr(vas));
+    }
+
+    vas = vaDestroyImage(hwctx->display, mapping->image.image_id);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to destroy image "
+               "derived from surface %#x: %d (%s).\n",
+               surface_id, vas, vaErrorStr(vas));
+    }
+
+    av_free(mapping);
+}
+
+static int vaapi_map_to_drm_abh(AVHWFramesContext *hwfc, AVFrame *dst,
+                                const AVFrame *src, int flags)
+{
+    AVVAAPIDeviceContext *hwctx = hwfc->device_ctx->hwctx;
+    VAAPIDRMImageBufferMapping *mapping = NULL;
+    VASurfaceID surface_id;
+    VAStatus vas;
+    int err, i, p;
+
+    surface_id = (VASurfaceID)(uintptr_t)src->data[3];
+    av_log(hwfc, AV_LOG_DEBUG, "Map VAAPI surface %#x to DRM.\n",
+           surface_id);
+
+    mapping = av_mallocz(sizeof(*mapping));
+    if (!mapping)
+        return AVERROR(ENOMEM);
+
+    vas = vaDeriveImage(hwctx->display, surface_id,
+                        &mapping->image);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to derive image from "
+               "surface %#x: %d (%s).\n",
+               surface_id, vas, vaErrorStr(vas));
+        err = AVERROR(EIO);
+        goto fail;
+    }
+
+    for (i = 0; i < FF_ARRAY_ELEMS(vaapi_drm_format_map); i++) {
+        if (vaapi_drm_format_map[i].va_fourcc ==
+            mapping->image.format.fourcc)
+            break;
+    }
+    if (i >= FF_ARRAY_ELEMS(vaapi_drm_format_map)) {
+        av_log(hwfc, AV_LOG_ERROR, "No matching DRM format for "
+               "VAAPI format %#x.\n", mapping->image.format.fourcc);
+        err = AVERROR(EINVAL);
+        goto fail_derived;
+    }
+
+    mapping->buffer_info.mem_type =
+        VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME;
+
+    mapping->drm_desc.nb_layers =
+        vaapi_drm_format_map[i].nb_layer_formats;
+    if (mapping->drm_desc.nb_layers > 1) {
+        if (mapping->drm_desc.nb_layers != mapping->image.num_planes) {
+            av_log(hwfc, AV_LOG_ERROR, "Image properties do not match "
+                   "expected format: got %d planes, but expected %d.\n",
+                   mapping->image.num_planes, mapping->drm_desc.nb_layers);
+            err = AVERROR(EINVAL);
+            goto fail_derived;
+        }
+
+        for(p = 0; p < mapping->drm_desc.nb_layers; p++) {
+            mapping->drm_desc.layers[p] = (AVDRMLayerDescriptor) {
+                .format    = vaapi_drm_format_map[i].layer_formats[p],
+                .nb_planes = 1,
+                .planes[0] = {
+                    .object_index = 0,
+                    .offset       = mapping->image.offsets[p],
+                    .pitch        = mapping->image.pitches[p],
+                },
+            };
+        }
+    } else {
+        mapping->drm_desc.layers[0].format =
+            vaapi_drm_format_map[i].layer_formats[0];
+        mapping->drm_desc.layers[0].nb_planes = mapping->image.num_planes;
+        for (p = 0; p < mapping->image.num_planes; p++) {
+            mapping->drm_desc.layers[0].planes[p] = (AVDRMPlaneDescriptor) {
+                .object_index = 0,
+                .offset       = mapping->image.offsets[p],
+                .pitch        = mapping->image.pitches[p],
+            };
+        }
+    }
+
+    vas = vaAcquireBufferHandle(hwctx->display, mapping->image.buf,
+                                &mapping->buffer_info);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to get buffer "
+               "handle from image %#x (derived from surface %#x): "
+               "%d (%s).\n", mapping->image.buf, surface_id,
+               vas, vaErrorStr(vas));
+        err = AVERROR(EIO);
+        goto fail_derived;
+    }
+
+    av_log(hwfc, AV_LOG_DEBUG, "DRM PRIME fd is %"PRIdPTR".\n",
+           mapping->buffer_info.handle);
+
+    mapping->drm_desc.nb_objects = 1;
+    mapping->drm_desc.objects[0] = (AVDRMObjectDescriptor) {
+        .fd   = mapping->buffer_info.handle,
+        .size = mapping->image.data_size,
+        // There is no way to get the format modifier with this API.
+        .format_modifier = DRM_FORMAT_MOD_INVALID,
+    };
+
+    err = ff_hwframe_map_create(src->hw_frames_ctx,
+                                dst, src, &vaapi_unmap_to_drm_abh,
+                                mapping);
+    if (err < 0)
+        goto fail_mapped;
+
+    dst->data[0] = (uint8_t*)&mapping->drm_desc;
+    dst->width   = src->width;
+    dst->height  = src->height;
+
+    return 0;
+
+fail_mapped:
+    vaReleaseBufferHandle(hwctx->display, mapping->image.buf);
+fail_derived:
+    vaDestroyImage(hwctx->display, mapping->image.image_id);
+fail:
+    av_freep(&mapping);
+    return err;
+}
+#endif
+
+static int vaapi_map_to_drm(AVHWFramesContext *hwfc, AVFrame *dst,
+                            const AVFrame *src, int flags)
+{
+#if VA_CHECK_VERSION(1, 1, 0)
+    int err;
+    err = vaapi_map_to_drm_esh(hwfc, dst, src, flags);
+    if (err != AVERROR(ENOSYS))
+        return err;
+#endif
+#if VA_CHECK_VERSION(0, 36, 0)
+    return vaapi_map_to_drm_abh(hwfc, dst, src, flags);
+#endif
+    return AVERROR(ENOSYS);
+}
+
+#endif /* CONFIG_LIBDRM */
+
+static int vaapi_map_to(AVHWFramesContext *hwfc, AVFrame *dst,
+                        const AVFrame *src, int flags)
+{
+    switch (src->format) {
+#if CONFIG_LIBDRM
+    case AV_PIX_FMT_DRM_PRIME:
+        return vaapi_map_from_drm(hwfc, dst, src, flags);
+#endif
+    default:
+        return AVERROR(ENOSYS);
+    }
+}
+
+static int vaapi_map_from(AVHWFramesContext *hwfc, AVFrame *dst,
+                          const AVFrame *src, int flags)
+{
+    switch (dst->format) {
+#if CONFIG_LIBDRM
+    case AV_PIX_FMT_DRM_PRIME:
+        return vaapi_map_to_drm(hwfc, dst, src, flags);
+#endif
+    default:
+        return vaapi_map_to_memory(hwfc, dst, src, flags);
+    }
+}
+
+static void vaapi_device_free(AVHWDeviceContext *ctx)
+{
+    AVVAAPIDeviceContext *hwctx = ctx->hwctx;
+    VAAPIDevicePriv      *priv  = ctx->user_opaque;
+
+    if (hwctx->display)
+        vaTerminate(hwctx->display);
+
+#if HAVE_VAAPI_X11
+    if (priv->x11_display)
+        XCloseDisplay(priv->x11_display);
+#endif
+
+    if (priv->drm_fd >= 0)
+        close(priv->drm_fd);
+
+    av_freep(&priv);
+}
+
+#if CONFIG_VAAPI_1
+static void vaapi_device_log_error(void *context, const char *message)
+{
+    AVHWDeviceContext *ctx = context;
+
+    av_log(ctx, AV_LOG_ERROR, "libva: %s", message);
+}
+
+static void vaapi_device_log_info(void *context, const char *message)
+{
+    AVHWDeviceContext *ctx = context;
+
+    av_log(ctx, AV_LOG_VERBOSE, "libva: %s", message);
+}
+#endif
+
+static int vaapi_device_connect(AVHWDeviceContext *ctx,
+                                VADisplay display)
+{
+    AVVAAPIDeviceContext *hwctx = ctx->hwctx;
+    int major, minor;
+    VAStatus vas;
+
+#if CONFIG_VAAPI_1
+    vaSetErrorCallback(display, &vaapi_device_log_error, ctx);
+    vaSetInfoCallback (display, &vaapi_device_log_info,  ctx);
+#endif
+
+    hwctx->display = display;
+
+    vas = vaInitialize(display, &major, &minor);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to initialise VAAPI "
+               "connection: %d (%s).\n", vas, vaErrorStr(vas));
+        return AVERROR(EIO);
+    }
+    av_log(ctx, AV_LOG_VERBOSE, "Initialised VAAPI connection: "
+           "version %d.%d\n", major, minor);
+
+    return 0;
+}
+
+static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
+                               AVDictionary *opts, int flags)
+{
+    VAAPIDevicePriv *priv;
+    VADisplay display = NULL;
+    const AVDictionaryEntry *ent;
+    int try_drm, try_x11, try_all;
+
+    priv = av_mallocz(sizeof(*priv));
+    if (!priv)
+        return AVERROR(ENOMEM);
+
+    priv->drm_fd = -1;
+
+    ctx->user_opaque = priv;
+    ctx->free        = vaapi_device_free;
+
+    ent = av_dict_get(opts, "connection_type", NULL, 0);
+    if (ent) {
+        try_all = try_drm = try_x11 = 0;
+        if (!strcmp(ent->value, "drm")) {
+            try_drm = 1;
+        } else if (!strcmp(ent->value, "x11")) {
+            try_x11 = 1;
+        } else {
+            av_log(ctx, AV_LOG_ERROR, "Invalid connection type %s.\n",
+                   ent->value);
+            return AVERROR(EINVAL);
+        }
+    } else {
+        try_all = 1;
+        try_drm = HAVE_VAAPI_DRM;
+        try_x11 = HAVE_VAAPI_X11;
+    }
+
+#if HAVE_VAAPI_DRM
+    while (!display && try_drm) {
+        // If the device is specified, try to open it as a DRM device node.
+        // If not, look for a usable render node, possibly restricted to those
+        // using a specified kernel driver.
+        int loglevel = try_all ? AV_LOG_VERBOSE : AV_LOG_ERROR;
+        if (device) {
+            priv->drm_fd = open(device, O_RDWR);
+            if (priv->drm_fd < 0) {
+                av_log(ctx, loglevel, "Failed to open %s as "
+                       "DRM device node.\n", device);
+                break;
+            }
+        } else {
+            char path[64];
+            int n, max_devices = 8;
+#if CONFIG_LIBDRM
+            drmVersion *info;
+            const AVDictionaryEntry *kernel_driver;
+            kernel_driver = av_dict_get(opts, "kernel_driver", NULL, 0);
+#endif
+            for (n = 0; n < max_devices; n++) {
+                snprintf(path, sizeof(path),
+                         "/dev/dri/renderD%d", 128 + n);
+                priv->drm_fd = open(path, O_RDWR);
+                if (priv->drm_fd < 0) {
+                    av_log(ctx, AV_LOG_VERBOSE, "Cannot open "
+                           "DRM render node for device %d.\n", n);
+                    break;
+                }
+#if CONFIG_LIBDRM
+                info = drmGetVersion(priv->drm_fd);
+                if (!info) {
+                    av_log(ctx, AV_LOG_VERBOSE,
+                           "Failed to get DRM version for device %d.\n", n);
+                    close(priv->drm_fd);
+                    priv->drm_fd = -1;
+                    continue;
+                }
+                if (kernel_driver) {
+                    if (strcmp(kernel_driver->value, info->name)) {
+                        av_log(ctx, AV_LOG_VERBOSE, "Ignoring device %d "
+                               "with non-matching kernel driver (%s).\n",
+                               n, info->name);
+                        drmFreeVersion(info);
+                        close(priv->drm_fd);
+                        priv->drm_fd = -1;
+                        continue;
+                    }
+                    av_log(ctx, AV_LOG_VERBOSE, "Trying to use "
+                           "DRM render node for device %d, "
+                           "with matching kernel driver (%s).\n",
+                           n, info->name);
+                    drmFreeVersion(info);
+                    break;
+                // drmGetVersion() ensures |info->name| is 0-terminated.
+                } else if (!strcmp(info->name, "vgem")) {
+                    av_log(ctx, AV_LOG_VERBOSE,
+                           "Skipping vgem node for device %d.\n", n);
+                    drmFreeVersion(info);
+                    close(priv->drm_fd);
+                    priv->drm_fd = -1;
+                    continue;
+                }
+                drmFreeVersion(info);
+#endif
+                av_log(ctx, AV_LOG_VERBOSE, "Trying to use "
+                       "DRM render node for device %d.\n", n);
+                break;
+            }
+            if (n >= max_devices)
+                break;
+        }
+
+        display = vaGetDisplayDRM(priv->drm_fd);
+        if (!display) {
+            av_log(ctx, AV_LOG_VERBOSE, "Cannot open a VA display "
+                   "from DRM device %s.\n", device);
+            return AVERROR_EXTERNAL;
+        }
+        break;
+    }
+#endif
+
+#if HAVE_VAAPI_X11
+    if (!display && try_x11) {
+        // Try to open the device as an X11 display.
+        priv->x11_display = XOpenDisplay(device);
+        if (!priv->x11_display) {
+            av_log(ctx, AV_LOG_VERBOSE, "Cannot open X11 display "
+                   "%s.\n", XDisplayName(device));
+        } else {
+            display = vaGetDisplay(priv->x11_display);
+            if (!display) {
+                av_log(ctx, AV_LOG_ERROR, "Cannot open a VA display "
+                       "from X11 display %s.\n", XDisplayName(device));
+                return AVERROR_UNKNOWN;
+            }
+
+            av_log(ctx, AV_LOG_VERBOSE, "Opened VA display via "
+                   "X11 display %s.\n", XDisplayName(device));
+        }
+    }
+#endif
+
+    if (!display) {
+        if (device)
+            av_log(ctx, AV_LOG_ERROR, "No VA display found for "
+                   "device %s.\n", device);
+        else
+            av_log(ctx, AV_LOG_ERROR, "No VA display found for "
+                   "any default device.\n");
+        return AVERROR(EINVAL);
+    }
+
+    ent = av_dict_get(opts, "driver", NULL, 0);
+    if (ent) {
+#if VA_CHECK_VERSION(0, 38, 0)
+        VAStatus vas;
+        vas = vaSetDriverName(display, ent->value);
+        if (vas != VA_STATUS_SUCCESS) {
+            av_log(ctx, AV_LOG_ERROR, "Failed to set driver name to "
+                   "%s: %d (%s).\n", ent->value, vas, vaErrorStr(vas));
+            vaTerminate(display);
+            return AVERROR_EXTERNAL;
+        }
+#else
+        av_log(ctx, AV_LOG_WARNING, "Driver name setting is not "
+               "supported with this VAAPI version.\n");
+#endif
+    }
+
+    return vaapi_device_connect(ctx, display);
+}
+
+static int vaapi_device_derive(AVHWDeviceContext *ctx,
+                               AVHWDeviceContext *src_ctx,
+                               AVDictionary *opts, int flags)
+{
+#if HAVE_VAAPI_DRM
+    if (src_ctx->type == AV_HWDEVICE_TYPE_DRM) {
+        AVDRMDeviceContext *src_hwctx = src_ctx->hwctx;
+        VADisplay *display;
+        VAAPIDevicePriv *priv;
+        int fd;
+
+        if (src_hwctx->fd < 0) {
+            av_log(ctx, AV_LOG_ERROR, "DRM instance requires an associated "
+                   "device to derive a VA display from.\n");
+            return AVERROR(EINVAL);
+        }
+
+#if CONFIG_LIBDRM
+        {
+            int node_type = drmGetNodeTypeFromFd(src_hwctx->fd);
+            char *render_node;
+            if (node_type < 0) {
+                av_log(ctx, AV_LOG_ERROR, "DRM instance fd does not appear "
+                       "to refer to a DRM device.\n");
+                return AVERROR(EINVAL);
+            }
+            if (node_type == DRM_NODE_RENDER) {
+                fd = src_hwctx->fd;
+            } else {
+                render_node = drmGetRenderDeviceNameFromFd(src_hwctx->fd);
+                if (!render_node) {
+                    av_log(ctx, AV_LOG_VERBOSE, "Using non-render node "
+                           "because the device does not have an "
+                           "associated render node.\n");
+                    fd = src_hwctx->fd;
+                } else {
+                    fd = open(render_node, O_RDWR);
+                    if (fd < 0) {
+                        av_log(ctx, AV_LOG_VERBOSE, "Using non-render node "
+                               "because the associated render node "
+                               "could not be opened.\n");
+                        fd = src_hwctx->fd;
+                    } else {
+                        av_log(ctx, AV_LOG_VERBOSE, "Using render node %s "
+                               "in place of non-render DRM device.\n",
+                               render_node);
+                    }
+                    free(render_node);
+                }
+            }
+        }
+#else
+        fd = src_hwctx->fd;
+#endif
+
+        priv = av_mallocz(sizeof(*priv));
+        if (!priv) {
+            if (fd != src_hwctx->fd) {
+                // The fd was opened in this function.
+                close(fd);
+            }
+            return AVERROR(ENOMEM);
+        }
+
+        if (fd == src_hwctx->fd) {
+            // The fd is inherited from the source context and we are holding
+            // a reference to that, we don't want to close it from here.
+            priv->drm_fd = -1;
+        } else {
+            priv->drm_fd = fd;
+        }
+
+        ctx->user_opaque = priv;
+        ctx->free        = &vaapi_device_free;
+
+        display = vaGetDisplayDRM(fd);
+        if (!display) {
+            av_log(ctx, AV_LOG_ERROR, "Failed to open a VA display from "
+                   "DRM device.\n");
+            return AVERROR(EIO);
+        }
+
+        return vaapi_device_connect(ctx, display);
+    }
+#endif
+    return AVERROR(ENOSYS);
+}
+
+const HWContextType ff_hwcontext_type_vaapi = {
+    .type                   = AV_HWDEVICE_TYPE_VAAPI,
+    .name                   = "VAAPI",
+
+    .device_hwctx_size      = sizeof(AVVAAPIDeviceContext),
+    .device_priv_size       = sizeof(VAAPIDeviceContext),
+    .device_hwconfig_size   = sizeof(AVVAAPIHWConfig),
+    .frames_hwctx_size      = sizeof(AVVAAPIFramesContext),
+    .frames_priv_size       = sizeof(VAAPIFramesContext),
+
+    .device_create          = &vaapi_device_create,
+    .device_derive          = &vaapi_device_derive,
+    .device_init            = &vaapi_device_init,
+    .device_uninit          = &vaapi_device_uninit,
+    .frames_get_constraints = &vaapi_frames_get_constraints,
+    .frames_init            = &vaapi_frames_init,
+    .frames_uninit          = &vaapi_frames_uninit,
+    .frames_get_buffer      = &vaapi_get_buffer,
+    .transfer_get_formats   = &vaapi_transfer_get_formats,
+    .transfer_data_to       = &vaapi_transfer_data_to,
+    .transfer_data_from     = &vaapi_transfer_data_from,
+    .map_to                 = &vaapi_map_to,
+    .map_from               = &vaapi_map_from,
+
+    .pix_fmts = (const enum AVPixelFormat[]) {
+        AV_PIX_FMT_VAAPI,
+        AV_PIX_FMT_NONE
+    },
+};