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   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <windows.h>
  20
  21 #define DXVA2API_USE_BITFIELDS
  22 #define COBJMACROS
  23
  24 #include <d3d9.h>
  25 #include <dxva2api.h>
  26 #include <initguid.h>
  27
  28 #include "avassert.h"
  29 #include "common.h"
  30 #include "hwcontext.h"
  31 #include "hwcontext_dxva2.h"
  32 #include "hwcontext_internal.h"
  33 #include "imgutils.h"
  34 #include "pixdesc.h"
  35 #include "pixfmt.h"
  36 #include "compat/w32dlfcn.h"
  37
  38 typedef IDirect3D9* WINAPI pDirect3DCreate9(UINT);
  39 typedef HRESULT WINAPI pDirect3DCreate9Ex(UINT, IDirect3D9Ex **);
  40 typedef HRESULT WINAPI pCreateDeviceManager9(UINT *, IDirect3DDeviceManager9 **);
  41
  42 #define FF_D3DCREATE_FLAGS (D3DCREATE_SOFTWARE_VERTEXPROCESSING | \
  43                             D3DCREATE_MULTITHREADED | \
  44                             D3DCREATE_FPU_PRESERVE)
  45
  46 static const D3DPRESENT_PARAMETERS dxva2_present_params = {
  47     .Windowed         = TRUE,
  48     .BackBufferWidth  = 640,
  49     .BackBufferHeight = 480,
  50     .BackBufferCount  = 0,
  51     .SwapEffect       = D3DSWAPEFFECT_DISCARD,
  52     .Flags            = D3DPRESENTFLAG_VIDEO,
  53 };
  54
  55 typedef struct DXVA2Mapping {
  56     uint32_t palette_dummy[256];
  57 } DXVA2Mapping;
  58
  59 typedef struct DXVA2FramesContext {
  60     IDirect3DSurface9 **surfaces_internal;
  61     int              nb_surfaces_used;
  62
  63     HANDLE  device_handle;
  64     IDirectXVideoAccelerationService *service;
  65
  66     D3DFORMAT format;
  67 } DXVA2FramesContext;
  68
  69 typedef struct DXVA2DevicePriv {
  70     HMODULE d3dlib;
  71     HMODULE dxva2lib;
  72
  73     HANDLE device_handle;
  74
  75     IDirect3D9       *d3d9;
  76     IDirect3DDevice9 *d3d9device;
  77 } DXVA2DevicePriv;
  78
  79 static const struct {
  80     D3DFORMAT d3d_format;
  81     enum AVPixelFormat pix_fmt;
  82 } supported_formats[] = {
  83     { MKTAG('N', 'V', '1', '2'), AV_PIX_FMT_NV12 },
  84     { MKTAG('P', '0', '1', '0'), AV_PIX_FMT_P010 },
  85     { D3DFMT_P8,                 AV_PIX_FMT_PAL8 },
  86 };
  87
  88 DEFINE_GUID(video_decoder_service,   0xfc51a551, 0xd5e7, 0x11d9, 0xaf, 0x55, 0x00, 0x05, 0x4e, 0x43, 0xff, 0x02);
  89 DEFINE_GUID(video_processor_service, 0xfc51a552, 0xd5e7, 0x11d9, 0xaf, 0x55, 0x00, 0x05, 0x4e, 0x43, 0xff, 0x02);
  90
  91 static void dxva2_frames_uninit(AVHWFramesContext *ctx)
  92 {
  93     AVDXVA2DeviceContext *device_hwctx = ctx->device_ctx->hwctx;
  94     AVDXVA2FramesContext *frames_hwctx = ctx->hwctx;
  95     DXVA2FramesContext *s = ctx->internal->priv;
  96     int i;
  97
  98     if (frames_hwctx->decoder_to_release)
  99         IDirectXVideoDecoder_Release(frames_hwctx->decoder_to_release);
 100
 101     if (s->surfaces_internal) {
 102         for (i = 0; i < frames_hwctx->nb_surfaces; i++) {
 103             if (s->surfaces_internal[i])
 104                 IDirect3DSurface9_Release(s->surfaces_internal[i]);
 105         }
 106     }
 107     av_freep(&s->surfaces_internal);
 108
 109     if (s->service) {
 110         IDirectXVideoAccelerationService_Release(s->service);
 111         s->service = NULL;
 112     }
 113
 114     if (s->device_handle != INVALID_HANDLE_VALUE) {
 115         IDirect3DDeviceManager9_CloseDeviceHandle(device_hwctx->devmgr, s->device_handle);
 116         s->device_handle = INVALID_HANDLE_VALUE;
 117     }
 118 }
 119
 120 static void dxva2_pool_release_dummy(void *opaque, uint8_t *data)
 121 {
 122     // important not to free anything here--data is a surface object
 123     // associated with the call to CreateSurface(), and these surfaces are
 124     // released in dxva2_frames_uninit()
 125 }
 126
 127 static AVBufferRef *dxva2_pool_alloc(void *opaque, buffer_size_t size)
 128 {
 129     AVHWFramesContext      *ctx = (AVHWFramesContext*)opaque;
 130     DXVA2FramesContext       *s = ctx->internal->priv;
 131     AVDXVA2FramesContext *hwctx = ctx->hwctx;
 132
 133     if (s->nb_surfaces_used < hwctx->nb_surfaces) {
 134         s->nb_surfaces_used++;
 135         return av_buffer_create((uint8_t*)s->surfaces_internal[s->nb_surfaces_used - 1],
 136                                 sizeof(*hwctx->surfaces), dxva2_pool_release_dummy, 0, 0);
 137     }
 138
 139     return NULL;
 140 }
 141
 142 static int dxva2_init_pool(AVHWFramesContext *ctx)
 143 {
 144     AVDXVA2FramesContext *frames_hwctx = ctx->hwctx;
 145     AVDXVA2DeviceContext *device_hwctx = ctx->device_ctx->hwctx;
 146     DXVA2FramesContext              *s = ctx->internal->priv;
 147     int decode = (frames_hwctx->surface_type == DXVA2_VideoDecoderRenderTarget);
 148
 149     int i;
 150     HRESULT hr;
 151
 152     if (ctx->initial_pool_size <= 0)
 153         return 0;
 154
 155     hr = IDirect3DDeviceManager9_OpenDeviceHandle(device_hwctx->devmgr, &s->device_handle);
 156     if (FAILED(hr)) {
 157         av_log(ctx, AV_LOG_ERROR, "Failed to open device handle\n");
 158         return AVERROR_UNKNOWN;
 159     }
 160
 161     hr = IDirect3DDeviceManager9_GetVideoService(device_hwctx->devmgr,
 162                                                  s->device_handle,
 163                                                  decode ? &video_decoder_service : &video_processor_service,
 164                                                  (void **)&s->service);
 165     if (FAILED(hr)) {
 166         av_log(ctx, AV_LOG_ERROR, "Failed to create the video service\n");
 167         return AVERROR_UNKNOWN;
 168     }
 169
 170     for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++) {
 171         if (ctx->sw_format == supported_formats[i].pix_fmt) {
 172             s->format = supported_formats[i].d3d_format;
 173             break;
 174         }
 175     }
 176     if (i == FF_ARRAY_ELEMS(supported_formats)) {
 177         av_log(ctx, AV_LOG_ERROR, "Unsupported pixel format: %s\n",
 178                av_get_pix_fmt_name(ctx->sw_format));
 179         return AVERROR(EINVAL);
 180     }
 181
 182     s->surfaces_internal = av_mallocz_array(ctx->initial_pool_size,
 183                                             sizeof(*s->surfaces_internal));
 184     if (!s->surfaces_internal)
 185         return AVERROR(ENOMEM);
 186
 187     hr = IDirectXVideoAccelerationService_CreateSurface(s->service,
 188                                                         ctx->width, ctx->height,
 189                                                         ctx->initial_pool_size - 1,
 190                                                         s->format, D3DPOOL_DEFAULT, 0,
 191                                                         frames_hwctx->surface_type,
 192                                                         s->surfaces_internal, NULL);
 193     if (FAILED(hr)) {
 194         av_log(ctx, AV_LOG_ERROR, "Could not create the surfaces\n");
 195         return AVERROR_UNKNOWN;
 196     }
 197
 198     ctx->internal->pool_internal = av_buffer_pool_init2(sizeof(*s->surfaces_internal),
 199                                                         ctx, dxva2_pool_alloc, NULL);
 200     if (!ctx->internal->pool_internal)
 201         return AVERROR(ENOMEM);
 202
 203     frames_hwctx->surfaces    = s->surfaces_internal;
 204     frames_hwctx->nb_surfaces = ctx->initial_pool_size;
 205
 206     return 0;
 207 }
 208
 209 static int dxva2_frames_init(AVHWFramesContext *ctx)
 210 {
 211     AVDXVA2FramesContext *hwctx = ctx->hwctx;
 212     DXVA2FramesContext       *s = ctx->internal->priv;
 213     int ret;
 214
 215     if (hwctx->surface_type != DXVA2_VideoDecoderRenderTarget &&
 216         hwctx->surface_type != DXVA2_VideoProcessorRenderTarget) {
 217         av_log(ctx, AV_LOG_ERROR, "Unknown surface type: %lu\n",
 218                hwctx->surface_type);
 219         return AVERROR(EINVAL);
 220     }
 221
 222     s->device_handle = INVALID_HANDLE_VALUE;
 223
 224     /* init the frame pool if the caller didn't provide one */
 225     if (!ctx->pool) {
 226         ret = dxva2_init_pool(ctx);
 227         if (ret < 0) {
 228             av_log(ctx, AV_LOG_ERROR, "Error creating an internal frame pool\n");
 229             return ret;
 230         }
 231     }
 232
 233     return 0;
 234 }
 235
 236 static int dxva2_get_buffer(AVHWFramesContext *ctx, AVFrame *frame)
 237 {
 238     frame->buf[0] = av_buffer_pool_get(ctx->pool);
 239     if (!frame->buf[0])
 240         return AVERROR(ENOMEM);
 241
 242     frame->data[3] = frame->buf[0]->data;
 243     frame->format  = AV_PIX_FMT_DXVA2_VLD;
 244     frame->width   = ctx->width;
 245     frame->height  = ctx->height;
 246
 247     return 0;
 248 }
 249
 250 static int dxva2_transfer_get_formats(AVHWFramesContext *ctx,
 251                                       enum AVHWFrameTransferDirection dir,
 252                                       enum AVPixelFormat **formats)
 253 {
 254     enum AVPixelFormat *fmts;
 255
 256     fmts = av_malloc_array(2, sizeof(*fmts));
 257     if (!fmts)
 258         return AVERROR(ENOMEM);
 259
 260     fmts[0] = ctx->sw_format;
 261     fmts[1] = AV_PIX_FMT_NONE;
 262
 263     *formats = fmts;
 264
 265     return 0;
 266 }
 267
 268 static void dxva2_unmap_frame(AVHWFramesContext *ctx, HWMapDescriptor *hwmap)
 269 {
 270     IDirect3DSurface9 *surface = (IDirect3DSurface9*)hwmap->source->data[3];
 271     IDirect3DSurface9_UnlockRect(surface);
 272     av_freep(&hwmap->priv);
 273 }
 274
 275 static int dxva2_map_frame(AVHWFramesContext *ctx, AVFrame *dst, const AVFrame *src,
 276                            int flags)
 277 {
 278     IDirect3DSurface9 *surface = (IDirect3DSurface9*)src->data[3];
 279     DXVA2Mapping      *map;
 280     D3DSURFACE_DESC    surfaceDesc;
 281     D3DLOCKED_RECT     LockedRect;
 282     HRESULT            hr;
 283     int i, err, nb_planes;
 284     int lock_flags = 0;
 285
 286     nb_planes = av_pix_fmt_count_planes(dst->format);
 287
 288     hr = IDirect3DSurface9_GetDesc(surface, &surfaceDesc);
 289     if (FAILED(hr)) {
 290         av_log(ctx, AV_LOG_ERROR, "Error getting a surface description\n");
 291         return AVERROR_UNKNOWN;
 292     }
 293
 294     if (!(flags & AV_HWFRAME_MAP_WRITE))
 295         lock_flags |= D3DLOCK_READONLY;
 296     if (flags & AV_HWFRAME_MAP_OVERWRITE)
 297         lock_flags |= D3DLOCK_DISCARD;
 298
 299     hr = IDirect3DSurface9_LockRect(surface, &LockedRect, NULL, lock_flags);
 300     if (FAILED(hr)) {
 301         av_log(ctx, AV_LOG_ERROR, "Unable to lock DXVA2 surface\n");
 302         return AVERROR_UNKNOWN;
 303     }
 304
 305     map = av_mallocz(sizeof(*map));
 306     if (!map) {
 307         err = AVERROR(ENOMEM);
 308         goto fail;
 309     }
 310
 311     err = ff_hwframe_map_create(src->hw_frames_ctx, dst, src,
 312                                 dxva2_unmap_frame, map);
 313     if (err < 0) {
 314         av_freep(&map);
 315         goto fail;
 316     }
 317
 318     for (i = 0; i < nb_planes; i++)
 319         dst->linesize[i] = LockedRect.Pitch;
 320
 321     av_image_fill_pointers(dst->data, dst->format, surfaceDesc.Height,
 322                            (uint8_t*)LockedRect.pBits, dst->linesize);
 323
 324     if (dst->format == AV_PIX_FMT_PAL8)
 325         dst->data[1] = (uint8_t*)map->palette_dummy;
 326
 327     return 0;
 328 fail:
 329     IDirect3DSurface9_UnlockRect(surface);
 330     return err;
 331 }
 332
 333 static int dxva2_transfer_data_to(AVHWFramesContext *ctx, AVFrame *dst,
 334                                   const AVFrame *src)
 335 {
 336     AVFrame *map;
 337     int ret;
 338
 339     if (src->format != ctx->sw_format)
 340         return AVERROR(ENOSYS);
 341
 342     map = av_frame_alloc();
 343     if (!map)
 344         return AVERROR(ENOMEM);
 345     map->format = dst->format;
 346
 347     ret = dxva2_map_frame(ctx, map, dst, AV_HWFRAME_MAP_WRITE | AV_HWFRAME_MAP_OVERWRITE);
 348     if (ret < 0)
 349         goto fail;
 350
 351     av_image_copy(map->data, map->linesize, (const uint8_t **)src->data, src->linesize,
 352                   ctx->sw_format, src->width, src->height);
 353
 354 fail:
 355     av_frame_free(&map);
 356     return ret;
 357 }
 358
 359 static int dxva2_transfer_data_from(AVHWFramesContext *ctx, AVFrame *dst,
 360                                     const AVFrame *src)
 361 {
 362     AVFrame *map;
 363     ptrdiff_t src_linesize[4], dst_linesize[4];
 364     int ret, i;
 365
 366     if (dst->format != ctx->sw_format)
 367         return AVERROR(ENOSYS);
 368
 369     map = av_frame_alloc();
 370     if (!map)
 371         return AVERROR(ENOMEM);
 372     map->format = dst->format;
 373
 374     ret = dxva2_map_frame(ctx, map, src, AV_HWFRAME_MAP_READ);
 375     if (ret < 0)
 376         goto fail;
 377
 378     for (i = 0; i < 4; i++) {
 379         dst_linesize[i] = dst->linesize[i];
 380         src_linesize[i] = map->linesize[i];
 381     }
 382     av_image_copy_uc_from(dst->data, dst_linesize, (const uint8_t **)map->data, src_linesize,
 383                           ctx->sw_format, src->width, src->height);
 384 fail:
 385     av_frame_free(&map);
 386     return ret;
 387 }
 388
 389 static int dxva2_map_from(AVHWFramesContext *ctx,
 390                           AVFrame *dst, const AVFrame *src, int flags)
 391 {
 392     int err;
 393
 394     if (dst->format != AV_PIX_FMT_NONE && dst->format != ctx->sw_format)
 395         return AVERROR(ENOSYS);
 396     dst->format = ctx->sw_format;
 397
 398     err = dxva2_map_frame(ctx, dst, src, flags);
 399     if (err < 0)
 400         return err;
 401
 402     err = av_frame_copy_props(dst, src);
 403     if (err < 0)
 404         return err;
 405
 406     return 0;
 407 }
 408
 409 static void dxva2_device_free(AVHWDeviceContext *ctx)
 410 {
 411     AVDXVA2DeviceContext *hwctx = ctx->hwctx;
 412     DXVA2DevicePriv       *priv = ctx->user_opaque;
 413
 414     if (hwctx->devmgr && priv->device_handle != INVALID_HANDLE_VALUE)
 415         IDirect3DDeviceManager9_CloseDeviceHandle(hwctx->devmgr, priv->device_handle);
 416
 417     if (hwctx->devmgr)
 418         IDirect3DDeviceManager9_Release(hwctx->devmgr);
 419
 420     if (priv->d3d9device)
 421         IDirect3DDevice9_Release(priv->d3d9device);
 422
 423     if (priv->d3d9)
 424         IDirect3D9_Release(priv->d3d9);
 425
 426     if (priv->d3dlib)
 427         dlclose(priv->d3dlib);
 428
 429     if (priv->dxva2lib)
 430         dlclose(priv->dxva2lib);
 431
 432     av_freep(&ctx->user_opaque);
 433 }
 434
 435 static int dxva2_device_create9(AVHWDeviceContext *ctx, UINT adapter)
 436 {
 437     DXVA2DevicePriv *priv = ctx->user_opaque;
 438     D3DPRESENT_PARAMETERS d3dpp = dxva2_present_params;
 439     D3DDISPLAYMODE d3ddm;
 440     HRESULT hr;
 441     pDirect3DCreate9 *createD3D = (pDirect3DCreate9 *)dlsym(priv->d3dlib, "Direct3DCreate9");
 442     if (!createD3D) {
 443         av_log(ctx, AV_LOG_ERROR, "Failed to locate Direct3DCreate9\n");
 444         return AVERROR_UNKNOWN;
 445     }
 446
 447     priv->d3d9 = createD3D(D3D_SDK_VERSION);
 448     if (!priv->d3d9) {
 449         av_log(ctx, AV_LOG_ERROR, "Failed to create IDirect3D object\n");
 450         return AVERROR_UNKNOWN;
 451     }
 452
 453     IDirect3D9_GetAdapterDisplayMode(priv->d3d9, adapter, &d3ddm);
 454
 455     d3dpp.BackBufferFormat = d3ddm.Format;
 456
 457     hr = IDirect3D9_CreateDevice(priv->d3d9, adapter, D3DDEVTYPE_HAL, GetDesktopWindow(),
 458                                  FF_D3DCREATE_FLAGS,
 459                                  &d3dpp, &priv->d3d9device);
 460     if (FAILED(hr)) {
 461         av_log(ctx, AV_LOG_ERROR, "Failed to create Direct3D device\n");
 462         return AVERROR_UNKNOWN;
 463     }
 464
 465     return 0;
 466 }
 467
 468 static int dxva2_device_create9ex(AVHWDeviceContext *ctx, UINT adapter)
 469 {
 470     DXVA2DevicePriv *priv = ctx->user_opaque;
 471     D3DPRESENT_PARAMETERS d3dpp = dxva2_present_params;
 472     D3DDISPLAYMODEEX modeex = {0};
 473     IDirect3D9Ex *d3d9ex = NULL;
 474     IDirect3DDevice9Ex *exdev = NULL;
 475     HRESULT hr;
 476     pDirect3DCreate9Ex *createD3DEx = (pDirect3DCreate9Ex *)dlsym(priv->d3dlib, "Direct3DCreate9Ex");
 477     if (!createD3DEx)
 478         return AVERROR(ENOSYS);
 479
 480     hr = createD3DEx(D3D_SDK_VERSION, &d3d9ex);
 481     if (FAILED(hr))
 482         return AVERROR_UNKNOWN;
 483
 484     modeex.Size = sizeof(D3DDISPLAYMODEEX);
 485     hr = IDirect3D9Ex_GetAdapterDisplayModeEx(d3d9ex, adapter, &modeex, NULL);
 486     if (FAILED(hr)) {
 487         IDirect3D9Ex_Release(d3d9ex);
 488         return AVERROR_UNKNOWN;
 489     }
 490
 491     d3dpp.BackBufferFormat = modeex.Format;
 492
 493     hr = IDirect3D9Ex_CreateDeviceEx(d3d9ex, adapter, D3DDEVTYPE_HAL, GetDesktopWindow(),
 494                                      FF_D3DCREATE_FLAGS,
 495                                      &d3dpp, NULL, &exdev);
 496     if (FAILED(hr)) {
 497         IDirect3D9Ex_Release(d3d9ex);
 498         return AVERROR_UNKNOWN;
 499     }
 500
 501     av_log(ctx, AV_LOG_VERBOSE, "Using D3D9Ex device.\n");
 502     priv->d3d9 = (IDirect3D9 *)d3d9ex;
 503     priv->d3d9device = (IDirect3DDevice9 *)exdev;
 504     return 0;
 505 }
 506
 507 static int dxva2_device_create(AVHWDeviceContext *ctx, const char *device,
 508                                AVDictionary *opts, int flags)
 509 {
 510     AVDXVA2DeviceContext *hwctx = ctx->hwctx;
 511     DXVA2DevicePriv *priv;
 512     pCreateDeviceManager9 *createDeviceManager = NULL;
 513     unsigned resetToken = 0;
 514     UINT adapter = D3DADAPTER_DEFAULT;
 515     HRESULT hr;
 516     int err;
 517
 518     if (device)
 519         adapter = atoi(device);
 520
 521     priv = av_mallocz(sizeof(*priv));
 522     if (!priv)
 523         return AVERROR(ENOMEM);
 524
 525     ctx->user_opaque = priv;
 526     ctx->free        = dxva2_device_free;
 527
 528     priv->device_handle = INVALID_HANDLE_VALUE;
 529
 530     priv->d3dlib = dlopen("d3d9.dll", 0);
 531     if (!priv->d3dlib) {
 532         av_log(ctx, AV_LOG_ERROR, "Failed to load D3D9 library\n");
 533         return AVERROR_UNKNOWN;
 534     }
 535     priv->dxva2lib = dlopen("dxva2.dll", 0);
 536     if (!priv->dxva2lib) {
 537         av_log(ctx, AV_LOG_ERROR, "Failed to load DXVA2 library\n");
 538         return AVERROR_UNKNOWN;
 539     }
 540
 541     createDeviceManager = (pCreateDeviceManager9 *)dlsym(priv->dxva2lib,
 542                                                          "DXVA2CreateDirect3DDeviceManager9");
 543     if (!createDeviceManager) {
 544         av_log(ctx, AV_LOG_ERROR, "Failed to locate DXVA2CreateDirect3DDeviceManager9\n");
 545         return AVERROR_UNKNOWN;
 546     }
 547
 548     if (dxva2_device_create9ex(ctx, adapter) < 0) {
 549         // Retry with "classic" d3d9
 550         err = dxva2_device_create9(ctx, adapter);
 551         if (err < 0)
 552             return err;
 553     }
 554
 555     hr = createDeviceManager(&resetToken, &hwctx->devmgr);
 556     if (FAILED(hr)) {
 557         av_log(ctx, AV_LOG_ERROR, "Failed to create Direct3D device manager\n");
 558         return AVERROR_UNKNOWN;
 559     }
 560
 561     hr = IDirect3DDeviceManager9_ResetDevice(hwctx->devmgr, priv->d3d9device, resetToken);
 562     if (FAILED(hr)) {
 563         av_log(ctx, AV_LOG_ERROR, "Failed to bind Direct3D device to device manager\n");
 564         return AVERROR_UNKNOWN;
 565     }
 566
 567     hr = IDirect3DDeviceManager9_OpenDeviceHandle(hwctx->devmgr, &priv->device_handle);
 568     if (FAILED(hr)) {
 569         av_log(ctx, AV_LOG_ERROR, "Failed to open device handle\n");
 570         return AVERROR_UNKNOWN;
 571     }
 572
 573     return 0;
 574 }
 575
 576 const HWContextType ff_hwcontext_type_dxva2 = {
 577     .type                 = AV_HWDEVICE_TYPE_DXVA2,
 578     .name                 = "DXVA2",
 579
 580     .device_hwctx_size    = sizeof(AVDXVA2DeviceContext),
 581     .frames_hwctx_size    = sizeof(AVDXVA2FramesContext),
 582     .frames_priv_size     = sizeof(DXVA2FramesContext),
 583
 584     .device_create        = dxva2_device_create,
 585     .frames_init          = dxva2_frames_init,
 586     .frames_uninit        = dxva2_frames_uninit,
 587     .frames_get_buffer    = dxva2_get_buffer,
 588     .transfer_get_formats = dxva2_transfer_get_formats,
 589     .transfer_data_to     = dxva2_transfer_data_to,
 590     .transfer_data_from   = dxva2_transfer_data_from,
 591     .map_from             = dxva2_map_from,
 592
 593     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_DXVA2_VLD, AV_PIX_FMT_NONE },
 594 };