/*

  * 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 <windows.h>
 
 #ifdef _WIN32_WINNT
 #undef _WIN32_WINNT
 #endif
 #define _WIN32_WINNT 0x0600
 #define DXVA2API_USE_BITFIELDS
 #define COBJMACROS
 
 #include <stdint.h>
 
 #include <d3d9.h>
 #include <dxva2api.h>
 

 #include "ffmpeg.h"

 
 #include "libavcodec/dxva2.h"
 
 #include "libavutil/avassert.h"
 #include "libavutil/buffer.h"
 #include "libavutil/frame.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/pixfmt.h"
 

 /* define all the GUIDs used directly here,
    to avoid problems with inconsistent dxva2api.h versions in mingw-w64 and different MSVC version */
 #include <initguid.h>
 DEFINE_GUID(IID_IDirectXVideoDecoderService, 0xfc51a551,0xd5e7,0x11d9,0xaf,0x55,0x00,0x05,0x4e,0x43,0xff,0x02);

 DEFINE_GUID(DXVA2_ModeMPEG2_VLD,      0xee27417f, 0x5e28,0x4e65,0xbe,0xea,0x1d,0x26,0xb5,0x08,0xad,0xc9);
 DEFINE_GUID(DXVA2_ModeMPEG2and1_VLD,  0x86695f12, 0x340e,0x4f04,0x9f,0xd3,0x92,0x53,0xdd,0x32,0x74,0x60);
 DEFINE_GUID(DXVA2_ModeH264_E,         0x1b81be68, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(DXVA2_ModeH264_F,         0x1b81be69, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);

 DEFINE_GUID(DXVADDI_Intel_ModeH264_E, 0x604F8E68, 0x4951,0x4C54,0x88,0xFE,0xAB,0xD2,0x5C,0x15,0xB3,0xD6);

 DEFINE_GUID(DXVA2_ModeVC1_D,          0x1b81beA3, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(DXVA2_ModeVC1_D2010,      0x1b81beA4, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(DXVA2_NoEncrypt,          0x1b81beD0, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);

 DEFINE_GUID(GUID_NULL,                0x00000000, 0x0000,0x0000,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
 

 typedef IDirect3D9* WINAPI pDirect3DCreate9(UINT);
 typedef HRESULT WINAPI pCreateDeviceManager9(UINT *, IDirect3DDeviceManager9 **);
 

 typedef struct dxva2_mode {
   const GUID     *guid;
   enum AVCodecID codec;
 } dxva2_mode;
 
 static const dxva2_mode dxva2_modes[] = {
     /* MPEG-2 */
     { &DXVA2_ModeMPEG2_VLD,      AV_CODEC_ID_MPEG2VIDEO },
     { &DXVA2_ModeMPEG2and1_VLD,  AV_CODEC_ID_MPEG2VIDEO },
 
     /* H.264 */
     { &DXVA2_ModeH264_F,         AV_CODEC_ID_H264 },
     { &DXVA2_ModeH264_E,         AV_CODEC_ID_H264 },
     /* Intel specific H.264 mode */
     { &DXVADDI_Intel_ModeH264_E, AV_CODEC_ID_H264 },
 
     /* VC-1 / WMV3 */
     { &DXVA2_ModeVC1_D2010,      AV_CODEC_ID_VC1  },
     { &DXVA2_ModeVC1_D2010,      AV_CODEC_ID_WMV3 },
     { &DXVA2_ModeVC1_D,          AV_CODEC_ID_VC1  },
     { &DXVA2_ModeVC1_D,          AV_CODEC_ID_WMV3 },
 
     { NULL,                      0 },
 };
 
 typedef struct surface_info {
     int used;
     uint64_t age;
 } surface_info;
 
 typedef struct DXVA2Context {
     HMODULE d3dlib;
     HMODULE dxva2lib;
 
     HANDLE  deviceHandle;
 
     IDirect3D9                  *d3d9;
     IDirect3DDevice9            *d3d9device;
     IDirect3DDeviceManager9     *d3d9devmgr;
     IDirectXVideoDecoderService *decoder_service;
     IDirectXVideoDecoder        *decoder;
 
     GUID                        decoder_guid;
     DXVA2_ConfigPictureDecode   decoder_config;
 
     LPDIRECT3DSURFACE9          *surfaces;
     surface_info                *surface_infos;
     uint32_t                    num_surfaces;
     uint64_t                    surface_age;
 
     AVFrame                     *tmp_frame;
 } DXVA2Context;
 
 typedef struct DXVA2SurfaceWrapper {
     DXVA2Context         *ctx;
     LPDIRECT3DSURFACE9   surface;
     IDirectXVideoDecoder *decoder;
 } DXVA2SurfaceWrapper;
 
 static void dxva2_destroy_decoder(AVCodecContext *s)
 {
     InputStream  *ist = s->opaque;
     DXVA2Context *ctx = ist->hwaccel_ctx;

     int i;

 
     if (ctx->surfaces) {

         for (i = 0; i < ctx->num_surfaces; i++) {

             if (ctx->surfaces[i])
                 IDirect3DSurface9_Release(ctx->surfaces[i]);
         }
     }
     av_freep(&ctx->surfaces);
     av_freep(&ctx->surface_infos);
     ctx->num_surfaces = 0;
     ctx->surface_age  = 0;
 
     if (ctx->decoder) {
         IDirectXVideoDecoder_Release(ctx->decoder);
         ctx->decoder = NULL;
     }
 }
 
 static void dxva2_uninit(AVCodecContext *s)
 {
     InputStream  *ist = s->opaque;
     DXVA2Context *ctx = ist->hwaccel_ctx;
 
     ist->hwaccel_uninit        = NULL;
     ist->hwaccel_get_buffer    = NULL;
     ist->hwaccel_retrieve_data = NULL;
 
     if (ctx->decoder)
         dxva2_destroy_decoder(s);
 
     if (ctx->decoder_service)
         IDirectXVideoDecoderService_Release(ctx->decoder_service);
 
     if (ctx->d3d9devmgr && ctx->deviceHandle != INVALID_HANDLE_VALUE)
         IDirect3DDeviceManager9_CloseDeviceHandle(ctx->d3d9devmgr, ctx->deviceHandle);
 
     if (ctx->d3d9devmgr)
         IDirect3DDeviceManager9_Release(ctx->d3d9devmgr);
 
     if (ctx->d3d9device)
         IDirect3DDevice9_Release(ctx->d3d9device);
 
     if (ctx->d3d9)
         IDirect3D9_Release(ctx->d3d9);
 
     if (ctx->d3dlib)
         FreeLibrary(ctx->d3dlib);
 
     if (ctx->dxva2lib)
         FreeLibrary(ctx->dxva2lib);
 
     av_frame_free(&ctx->tmp_frame);
 
     av_freep(&ist->hwaccel_ctx);
     av_freep(&s->hwaccel_context);
 }
 
 static void dxva2_release_buffer(void *opaque, uint8_t *data)
 {
     DXVA2SurfaceWrapper *w   = opaque;
     DXVA2Context        *ctx = w->ctx;
     int i;
 
     for (i = 0; i < ctx->num_surfaces; i++) {
         if (ctx->surfaces[i] == w->surface) {
             ctx->surface_infos[i].used = 0;
             break;
         }
     }
     IDirect3DSurface9_Release(w->surface);
     IDirectXVideoDecoder_Release(w->decoder);
     av_free(w);
 }
 
 static int dxva2_get_buffer(AVCodecContext *s, AVFrame *frame, int flags)
 {
     InputStream  *ist = s->opaque;
     DXVA2Context *ctx = ist->hwaccel_ctx;
     int i, old_unused = -1;
     LPDIRECT3DSURFACE9 surface;
     DXVA2SurfaceWrapper *w = NULL;
 
     av_assert0(frame->format == AV_PIX_FMT_DXVA2_VLD);
 
     for (i = 0; i < ctx->num_surfaces; i++) {
         surface_info *info = &ctx->surface_infos[i];
         if (!info->used && (old_unused == -1 || info->age < ctx->surface_infos[old_unused].age))
             old_unused = i;
     }
     if (old_unused == -1) {
         av_log(NULL, AV_LOG_ERROR, "No free DXVA2 surface!\n");
         return AVERROR(ENOMEM);
     }
     i = old_unused;
 
     surface = ctx->surfaces[i];
 
     w = av_mallocz(sizeof(*w));
     if (!w)
         return AVERROR(ENOMEM);
 
     frame->buf[0] = av_buffer_create((uint8_t*)surface, 0,
                                      dxva2_release_buffer, w,
                                      AV_BUFFER_FLAG_READONLY);
     if (!frame->buf[0]) {
         av_free(w);
         return AVERROR(ENOMEM);
     }
 
     w->ctx     = ctx;
     w->surface = surface;
     IDirect3DSurface9_AddRef(w->surface);
     w->decoder = ctx->decoder;
     IDirectXVideoDecoder_AddRef(w->decoder);
 
     ctx->surface_infos[i].used = 1;
     ctx->surface_infos[i].age  = ctx->surface_age++;
 
     frame->data[3] = (uint8_t *)surface;
 
     return 0;
 }
 
 static int dxva2_retrieve_data(AVCodecContext *s, AVFrame *frame)
 {
     LPDIRECT3DSURFACE9 surface =  (LPDIRECT3DSURFACE9)frame->data[3];
     InputStream        *ist = s->opaque;
     DXVA2Context       *ctx = ist->hwaccel_ctx;
     D3DSURFACE_DESC    surfaceDesc;
     D3DLOCKED_RECT     LockedRect;
     HRESULT            hr;
     int                ret;
 
     IDirect3DSurface9_GetDesc(surface, &surfaceDesc);
 
     ctx->tmp_frame->width  = frame->width;
     ctx->tmp_frame->height = frame->height;
     ctx->tmp_frame->format = AV_PIX_FMT_NV12;
 
     ret = av_frame_get_buffer(ctx->tmp_frame, 32);
     if (ret < 0)
         return ret;
 
     hr = IDirect3DSurface9_LockRect(surface, &LockedRect, NULL, D3DLOCK_READONLY);
     if (FAILED(hr)) {
         av_log(NULL, AV_LOG_ERROR, "Unable to lock DXVA2 surface\n");
         return AVERROR_UNKNOWN;
     }
 
     av_image_copy_plane(ctx->tmp_frame->data[0], ctx->tmp_frame->linesize[0],
                         (uint8_t*)LockedRect.pBits,
                         LockedRect.Pitch, frame->width, frame->height);
 
     av_image_copy_plane(ctx->tmp_frame->data[1], ctx->tmp_frame->linesize[1],
                         (uint8_t*)LockedRect.pBits + LockedRect.Pitch * surfaceDesc.Height,
                         LockedRect.Pitch, frame->width, frame->height / 2);
 
     IDirect3DSurface9_UnlockRect(surface);
 
     ret = av_frame_copy_props(ctx->tmp_frame, frame);
     if (ret < 0)
         goto fail;
 
     av_frame_unref(frame);
     av_frame_move_ref(frame, ctx->tmp_frame);
 
     return 0;
 fail:
     av_frame_unref(ctx->tmp_frame);
     return ret;
 }
 
 static int dxva2_alloc(AVCodecContext *s)
 {
     InputStream  *ist = s->opaque;
     int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
     DXVA2Context *ctx;
     pDirect3DCreate9      *createD3D = NULL;
     pCreateDeviceManager9 *createDeviceManager = NULL;
     HRESULT hr;
     D3DPRESENT_PARAMETERS d3dpp = {0};
     D3DDISPLAYMODE        d3ddm;
     unsigned resetToken = 0;
     UINT adapter = D3DADAPTER_DEFAULT;
 
     ctx = av_mallocz(sizeof(*ctx));
     if (!ctx)
         return AVERROR(ENOMEM);
 
     ctx->deviceHandle = INVALID_HANDLE_VALUE;
 
     ist->hwaccel_ctx           = ctx;
     ist->hwaccel_uninit        = dxva2_uninit;
     ist->hwaccel_get_buffer    = dxva2_get_buffer;
     ist->hwaccel_retrieve_data = dxva2_retrieve_data;
 
     ctx->d3dlib = LoadLibrary("d3d9.dll");
     if (!ctx->d3dlib) {
         av_log(NULL, loglevel, "Failed to load D3D9 library\n");
         goto fail;
     }
     ctx->dxva2lib = LoadLibrary("dxva2.dll");
     if (!ctx->dxva2lib) {
         av_log(NULL, loglevel, "Failed to load DXVA2 library\n");
         goto fail;
     }
 
     createD3D = (pDirect3DCreate9 *)GetProcAddress(ctx->d3dlib, "Direct3DCreate9");
     if (!createD3D) {
         av_log(NULL, loglevel, "Failed to locate Direct3DCreate9\n");
         goto fail;
     }
     createDeviceManager = (pCreateDeviceManager9 *)GetProcAddress(ctx->dxva2lib, "DXVA2CreateDirect3DDeviceManager9");
     if (!createDeviceManager) {
         av_log(NULL, loglevel, "Failed to locate DXVA2CreateDirect3DDeviceManager9\n");
         goto fail;
     }
 
     ctx->d3d9 = createD3D(D3D_SDK_VERSION);
     if (!ctx->d3d9) {
         av_log(NULL, loglevel, "Failed to create IDirect3D object\n");
         goto fail;
     }
 
     if (ist->hwaccel_device) {
         adapter = atoi(ist->hwaccel_device);
         av_log(NULL, AV_LOG_INFO, "Using HWAccel device %d\n", adapter);
     }
 
     IDirect3D9_GetAdapterDisplayMode(ctx->d3d9, adapter, &d3ddm);
     d3dpp.Windowed         = TRUE;
     d3dpp.BackBufferWidth  = 640;
     d3dpp.BackBufferHeight = 480;
     d3dpp.BackBufferCount  = 0;
     d3dpp.BackBufferFormat = d3ddm.Format;
     d3dpp.SwapEffect       = D3DSWAPEFFECT_DISCARD;
     d3dpp.Flags            = D3DPRESENTFLAG_VIDEO;
 
     hr = IDirect3D9_CreateDevice(ctx->d3d9, adapter, D3DDEVTYPE_HAL, GetShellWindow(),
                                  D3DCREATE_SOFTWARE_VERTEXPROCESSING | D3DCREATE_MULTITHREADED | D3DCREATE_FPU_PRESERVE,
                                  &d3dpp, &ctx->d3d9device);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to create Direct3D device\n");
         goto fail;
     }
 
     hr = createDeviceManager(&resetToken, &ctx->d3d9devmgr);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to create Direct3D device manager\n");
         goto fail;
     }
 
     hr = IDirect3DDeviceManager9_ResetDevice(ctx->d3d9devmgr, ctx->d3d9device, resetToken);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to bind Direct3D device to device manager\n");
         goto fail;
     }
 
     hr = IDirect3DDeviceManager9_OpenDeviceHandle(ctx->d3d9devmgr, &ctx->deviceHandle);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to open device handle\n");
         goto fail;
     }
 
     hr = IDirect3DDeviceManager9_GetVideoService(ctx->d3d9devmgr, ctx->deviceHandle, &IID_IDirectXVideoDecoderService, (void **)&ctx->decoder_service);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to create IDirectXVideoDecoderService\n");
         goto fail;
     }
 
     ctx->tmp_frame = av_frame_alloc();
     if (!ctx->tmp_frame)
         goto fail;
 
     s->hwaccel_context = av_mallocz(sizeof(struct dxva_context));
     if (!s->hwaccel_context)
         goto fail;
 
     return 0;
 fail:
     dxva2_uninit(s);
     return AVERROR(EINVAL);
 }
 
 static int dxva2_get_decoder_configuration(AVCodecContext *s, const GUID *device_guid,
                                            const DXVA2_VideoDesc *desc,
                                            DXVA2_ConfigPictureDecode *config)
 {
     InputStream  *ist = s->opaque;
     int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
     DXVA2Context *ctx = ist->hwaccel_ctx;
     unsigned cfg_count = 0, best_score = 0;
     DXVA2_ConfigPictureDecode *cfg_list = NULL;
     DXVA2_ConfigPictureDecode best_cfg = {{0}};
     HRESULT hr;
     int i;
 
     hr = IDirectXVideoDecoderService_GetDecoderConfigurations(ctx->decoder_service, device_guid, desc, NULL, &cfg_count, &cfg_list);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Unable to retrieve decoder configurations\n");
         return AVERROR(EINVAL);
     }
 
     for (i = 0; i < cfg_count; i++) {
         DXVA2_ConfigPictureDecode *cfg = &cfg_list[i];
 
         unsigned score;
         if (cfg->ConfigBitstreamRaw == 1)
             score = 1;
         else if (s->codec_id == AV_CODEC_ID_H264 && cfg->ConfigBitstreamRaw == 2)
             score = 2;
         else
             continue;
         if (IsEqualGUID(&cfg->guidConfigBitstreamEncryption, &DXVA2_NoEncrypt))
             score += 16;
         if (score > best_score) {
             best_score = score;
             best_cfg   = *cfg;
         }
     }
     CoTaskMemFree(cfg_list);
 
     if (!best_score) {
         av_log(NULL, loglevel, "No valid decoder configuration available\n");
         return AVERROR(EINVAL);
     }
 
     *config = best_cfg;
     return 0;
 }
 
 static int dxva2_create_decoder(AVCodecContext *s)
 {
     InputStream  *ist = s->opaque;
     int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
     DXVA2Context *ctx = ist->hwaccel_ctx;
     struct dxva_context *dxva_ctx = s->hwaccel_context;
     GUID *guid_list = NULL;
     unsigned guid_count = 0, i, j;
     GUID device_guid = GUID_NULL;
     D3DFORMAT target_format = 0;
     DXVA2_VideoDesc desc = { 0 };
     DXVA2_ConfigPictureDecode config;
     HRESULT hr;
     int surface_alignment;
     int ret;
 
     hr = IDirectXVideoDecoderService_GetDecoderDeviceGuids(ctx->decoder_service, &guid_count, &guid_list);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to retrieve decoder device GUIDs\n");
         goto fail;
     }
 
     for (i = 0; dxva2_modes[i].guid; i++) {
         D3DFORMAT *target_list = NULL;
         unsigned target_count = 0;
         const dxva2_mode *mode = &dxva2_modes[i];
         if (mode->codec != s->codec_id)
             continue;
 
         for (j = 0; j < guid_count; j++) {
             if (IsEqualGUID(mode->guid, &guid_list[j]))
                 break;
         }
         if (j == guid_count)
             continue;
 
         hr = IDirectXVideoDecoderService_GetDecoderRenderTargets(ctx->decoder_service, mode->guid, &target_count, &target_list);
         if (FAILED(hr)) {
             continue;
         }
         for (j = 0; j < target_count; j++) {
             const D3DFORMAT format = target_list[j];
             if (format == MKTAG('N','V','1','2')) {
                 target_format = format;
                 break;
             }
         }
         CoTaskMemFree(target_list);
         if (target_format) {
             device_guid = *mode->guid;
             break;
         }
     }
     CoTaskMemFree(guid_list);
 
     if (IsEqualGUID(&device_guid, &GUID_NULL)) {
         av_log(NULL, loglevel, "No decoder device for codec found\n");
         goto fail;
     }
 
     desc.SampleWidth  = s->coded_width;
     desc.SampleHeight = s->coded_height;
     desc.Format       = target_format;
 
     ret = dxva2_get_decoder_configuration(s, &device_guid, &desc, &config);
     if (ret < 0) {
         goto fail;
     }
 
     /* decoding MPEG-2 requires additional alignment on some Intel GPUs,
        but it causes issues for H.264 on certain AMD GPUs..... */
     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO)
         surface_alignment = 32;
     else
         surface_alignment = 16;
 
     /* 4 base work surfaces */
     ctx->num_surfaces = 4;
 
     /* add surfaces based on number of possible refs */
     if (s->codec_id == AV_CODEC_ID_H264)
         ctx->num_surfaces += 16;
     else
         ctx->num_surfaces += 2;
 
     /* add extra surfaces for frame threading */
     if (s->active_thread_type & FF_THREAD_FRAME)
         ctx->num_surfaces += s->thread_count;
 
     ctx->surfaces      = av_mallocz(ctx->num_surfaces * sizeof(*ctx->surfaces));
     ctx->surface_infos = av_mallocz(ctx->num_surfaces * sizeof(*ctx->surface_infos));
 
     if (!ctx->surfaces || !ctx->surface_infos) {
         av_log(NULL, loglevel, "Unable to allocate surface arrays\n");
         goto fail;
     }
 
     hr = IDirectXVideoDecoderService_CreateSurface(ctx->decoder_service,
                                                    FFALIGN(s->coded_width, surface_alignment),
                                                    FFALIGN(s->coded_height, surface_alignment),
                                                    ctx->num_surfaces - 1,
                                                    target_format, D3DPOOL_DEFAULT, 0,
                                                    DXVA2_VideoDecoderRenderTarget,
                                                    ctx->surfaces, NULL);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to create %d video surfaces\n", ctx->num_surfaces);
         goto fail;
     }
 
     hr = IDirectXVideoDecoderService_CreateVideoDecoder(ctx->decoder_service, &device_guid,
                                                         &desc, &config, ctx->surfaces,
                                                         ctx->num_surfaces, &ctx->decoder);
     if (FAILED(hr)) {
         av_log(NULL, loglevel, "Failed to create DXVA2 video decoder\n");
         goto fail;
     }
 
     ctx->decoder_guid   = device_guid;
     ctx->decoder_config = config;
 
     dxva_ctx->cfg           = &ctx->decoder_config;
     dxva_ctx->decoder       = ctx->decoder;
     dxva_ctx->surface       = ctx->surfaces;
     dxva_ctx->surface_count = ctx->num_surfaces;
 
     if (IsEqualGUID(&ctx->decoder_guid, &DXVADDI_Intel_ModeH264_E))
         dxva_ctx->workaround |= FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO;
 
     return 0;
 fail:
     dxva2_destroy_decoder(s);
     return AVERROR(EINVAL);
 }
 
 int dxva2_init(AVCodecContext *s)
 {
     InputStream *ist = s->opaque;
     int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
     DXVA2Context *ctx;
     int ret;
 
     if (!ist->hwaccel_ctx) {
         ret = dxva2_alloc(s);
         if (ret < 0)
             return ret;
     }
     ctx = ist->hwaccel_ctx;
 
     if (s->codec_id == AV_CODEC_ID_H264 &&
         (s->profile & ~FF_PROFILE_H264_CONSTRAINED) > FF_PROFILE_H264_HIGH) {
         av_log(NULL, loglevel, "Unsupported H.264 profile for DXVA2 HWAccel: %d\n", s->profile);
         return AVERROR(EINVAL);
     }
 
     if (ctx->decoder)
         dxva2_destroy_decoder(s);
 
     ret = dxva2_create_decoder(s);
     if (ret < 0) {
         av_log(NULL, loglevel, "Error creating the DXVA2 decoder\n");
         return ret;
     }
 
     return 0;
 }