/*

  * DXVA2 H.264 HW acceleration.

  *
  * copyright (c) 2009 Laurent Aimar
  *
  * 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 "libavutil/avassert.h"
 

 #include "dxva2_internal.h"

 #include "h264dec.h"

 #include "h264data.h"

 #include "h264_ps.h"

 #include "mpegutils.h"

 
 struct dxva2_picture_context {
     DXVA_PicParams_H264   pp;
     DXVA_Qmatrix_H264     qm;
     unsigned              slice_count;
     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
     const uint8_t         *bitstream;
     unsigned              bitstream_size;
 };
 
 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
                                unsigned index, unsigned flag)
 {
     assert((index&0x7f) == index && (flag&0x01) == flag);
     pic->bPicEntry = index | (flag << 7);
 }
 

 static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h,

                                     DXVA_PicParams_H264 *pp)
 {

     const H264Picture *current_picture = h->cur_pic_ptr;

     const SPS *sps = h->ps.sps;
     const PPS *pps = h->ps.pps;

     int i, j;

 
     memset(pp, 0, sizeof(*pp));
     /* Configure current picture */
     fill_picture_entry(&pp->CurrPic,

                        ff_dxva2_get_surface_index(avctx, ctx, current_picture->f),

                        h->picture_structure == PICT_BOTTOM_FIELD);

     /* Configure the set of references */
     pp->UsedForReferenceFlags  = 0;
     pp->NonExistingFrameFlags  = 0;

     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {

         const H264Picture *r;

         if (j < h->short_ref_count) {
             r = h->short_ref[j++];
         } else {
             r = NULL;
             while (!r && j < h->short_ref_count + 16)
                 r = h->long_ref[j++ - h->short_ref_count];
         }

         if (r) {

             fill_picture_entry(&pp->RefFrameList[i],

                                ff_dxva2_get_surface_index(avctx, ctx, r->f),

                                r->long_ref != 0);
 

             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)

                 pp->FieldOrderCntList[i][0] = r->field_poc[0];

             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)

                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
 
             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;

             if (r->reference & PICT_TOP_FIELD)

                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);

             if (r->reference & PICT_BOTTOM_FIELD)

                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
         } else {
             pp->RefFrameList[i].bPicEntry = 0xff;
             pp->FieldOrderCntList[i][0]   = 0;
             pp->FieldOrderCntList[i][1]   = 0;
             pp->FrameNumList[i]           = 0;
         }
     }
 

     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;

     pp->num_ref_frames                = sps->ref_frame_count;

     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |

                                         ((sps->mb_aff &&

                                         (h->picture_structure == PICT_FRAME)) <<  1) |

                                         (sps->residual_color_transform_flag   <<  2) |

                                         /* sp_for_switch_flag (not implemented by FFmpeg) */

                                         (0                                    <<  3) |

                                         (sps->chroma_format_idc               <<  4) |

                                         ((h->nal_ref_idc != 0)                <<  6) |

                                         (pps->constrained_intra_pred          <<  7) |
                                         (pps->weighted_pred                   <<  8) |
                                         (pps->weighted_bipred_idc             <<  9) |

                                         /* MbsConsecutiveFlag */
                                         (1                                    << 11) |

                                         (sps->frame_mbs_only_flag             << 12) |
                                         (pps->transform_8x8_mode              << 13) |
                                         ((sps->level_idc >= 31)               << 14) |

                                         /* IntraPicFlag (Modified if we detect a non

                                          * intra slice in dxva2_h264_decode_slice) */

                                         (1                                    << 15);
 

     pp->bit_depth_luma_minus8         = sps->bit_depth_luma - 8;
     pp->bit_depth_chroma_minus8       = sps->bit_depth_chroma - 8;

     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)

         pp->Reserved16Bits            = 0;

     else if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)

         pp->Reserved16Bits            = 0x34c;

     else

         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */

     pp->StatusReportFeedbackNumber    = 1 + DXVA_CONTEXT_REPORT_ID(avctx, ctx)++;

     pp->CurrFieldOrderCnt[0] = 0;

     if ((h->picture_structure & PICT_TOP_FIELD) &&

         current_picture->field_poc[0] != INT_MAX)
         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
     pp->CurrFieldOrderCnt[1] = 0;

     if ((h->picture_structure & PICT_BOTTOM_FIELD) &&

         current_picture->field_poc[1] != INT_MAX)
         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];

     pp->pic_init_qs_minus26           = pps->init_qs - 26;
     pp->chroma_qp_index_offset        = pps->chroma_qp_index_offset[0];
     pp->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];

     pp->ContinuationFlag              = 1;

     pp->pic_init_qp_minus26           = pps->init_qp - 26;
     pp->num_ref_idx_l0_active_minus1  = pps->ref_count[0] - 1;
     pp->num_ref_idx_l1_active_minus1  = pps->ref_count[1] - 1;

     pp->Reserved8BitsA                = 0;

     pp->frame_num                     = h->poc.frame_num;

     pp->log2_max_frame_num_minus4     = sps->log2_max_frame_num - 4;
     pp->pic_order_cnt_type            = sps->poc_type;
     if (sps->poc_type == 0)
         pp->log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
     else if (sps->poc_type == 1)
         pp->delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
     pp->direct_8x8_inference_flag     = sps->direct_8x8_inference_flag;
     pp->entropy_coding_mode_flag      = pps->cabac;
     pp->pic_order_present_flag        = pps->pic_order_present;
     pp->num_slice_groups_minus1       = pps->slice_group_count - 1;
     pp->slice_group_map_type          = pps->mb_slice_group_map_type;
     pp->deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
     pp->redundant_pic_cnt_present_flag= pps->redundant_pic_cnt_present;

     pp->Reserved8BitsB                = 0;

     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */

 }
 

 static void fill_scaling_lists(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)

 {

     const PPS *pps = h->ps.pps;

     unsigned i, j;
     memset(qm, 0, sizeof(*qm));

     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {

         for (i = 0; i < 6; i++)
             for (j = 0; j < 16; j++)

                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][j];

         for (i = 0; i < 64; i++) {

             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][i];
             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][i];

         }

     } else {

         for (i = 0; i < 6; i++)
             for (j = 0; j < 16; j++)

                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][ff_zigzag_scan[j]];

         for (i = 0; i < 64; i++) {

             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][ff_zigzag_direct[i]];
             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][ff_zigzag_direct[i]];

         }

     }

 }
 

 static int is_slice_short(const AVCodecContext *avctx, AVDXVAContext *ctx)

 {

     assert(DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 1 ||
            DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2);
     return DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2;

 }
 
 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
                              unsigned position, unsigned size)
 {
     memset(slice, 0, sizeof(*slice));
     slice->BSNALunitDataLocation = position;
     slice->SliceBytesInBuffer    = size;
     slice->wBadSliceChopping     = 0;
 }
 

 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
 {
     int i;
     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
         if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
           return i;
     }
     return 0x7f;
 }
 

 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,

                             const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)

 {

     const H264Context *h = avctx->priv_data;

     H264SliceContext *sl = &h->slice_ctx[0];

     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);

     unsigned list;
 
     memset(slice, 0, sizeof(*slice));
     slice->BSNALunitDataLocation = position;
     slice->SliceBytesInBuffer    = size;
     slice->wBadSliceChopping     = 0;
 

     slice->first_mb_in_slice     = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;

     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */

     slice->BitOffsetToSliceData  = get_bits_count(&sl->gb) - 8;

     slice->slice_type            = ff_h264_get_slice_type(sl);
     if (sl->slice_type_fixed)

         slice->slice_type += 5;

     slice->luma_log2_weight_denom       = sl->pwt.luma_log2_weight_denom;
     slice->chroma_log2_weight_denom     = sl->pwt.chroma_log2_weight_denom;

     if (sl->list_count > 0)
         slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
     if (sl->list_count > 1)
         slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;

     slice->slice_alpha_c0_offset_div2   = sl->slice_alpha_c0_offset / 2;
     slice->slice_beta_offset_div2       = sl->slice_beta_offset     / 2;

     slice->Reserved8Bits                = 0;
 
     for (list = 0; list < 2; list++) {
         unsigned i;
         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {

             if (list < sl->list_count && i < sl->ref_count[list]) {

                 const H264Picture *r = sl->ref_list[list][i].parent;

                 unsigned plane;

                 unsigned index;

                 if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
                     index = ff_dxva2_get_surface_index(avctx, ctx, r->f);

                 else

                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, r->f));

                 fill_picture_entry(&slice->RefPicList[list][i], index,

                                    sl->ref_list[list][i].reference == PICT_BOTTOM_FIELD);

                 for (plane = 0; plane < 3; plane++) {
                     int w, o;

                     if (plane == 0 && sl->pwt.luma_weight_flag[list]) {
                         w = sl->pwt.luma_weight[i][list][0];
                         o = sl->pwt.luma_weight[i][list][1];
                     } else if (plane >= 1 && sl->pwt.chroma_weight_flag[list]) {
                         w = sl->pwt.chroma_weight[i][list][plane-1][0];
                         o = sl->pwt.chroma_weight[i][list][plane-1][1];

                     } else {

                         w = 1 << (plane == 0 ? sl->pwt.luma_log2_weight_denom :
                                                sl->pwt.chroma_log2_weight_denom);

                         o = 0;
                     }
                     slice->Weights[list][i][plane][0] = w;
                     slice->Weights[list][i][plane][1] = o;
                 }
             } else {
                 unsigned plane;
                 slice->RefPicList[list][i].bPicEntry = 0xff;
                 for (plane = 0; plane < 3; plane++) {
                     slice->Weights[list][i][plane][0] = 0;
                     slice->Weights[list][i][plane][1] = 0;
                 }
             }
         }
     }

     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */

     slice->slice_qp_delta    = sl->qscale - h->ps.pps->init_qp;

     slice->redundant_pic_cnt = sl->redundant_pic_count;

     if (sl->slice_type == AV_PICTURE_TYPE_B)

         slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;

     slice->cabac_init_idc = h->ps.pps->cabac ? sl->cabac_init_idc : 0;

     if (sl->deblocking_filter < 2)
         slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;

     else

         slice->disable_deblocking_filter_idc = sl->deblocking_filter;

     slice->slice_id = h->current_slice - 1;
 }
 
 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,

                                              DECODER_BUFFER_DESC *bs,
                                              DECODER_BUFFER_DESC *sc)

 {

     const H264Context *h = avctx->priv_data;

     const unsigned mb_count = h->mb_width * h->mb_height;

     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);

     const H264Picture *current_picture = h->cur_pic_ptr;

     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;

     DXVA_Slice_H264_Short *slice = NULL;

     void     *dxva_data_ptr = NULL;

     uint8_t  *dxva_data, *current, *end;

     unsigned dxva_size = 0;

     void     *slice_data;
     unsigned slice_size;
     unsigned padding;
     unsigned i;

     unsigned type;

 
     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */

 #if CONFIG_D3D11VA

     if (ff_dxva2_is_d3d11(avctx)) {

         type = D3D11_VIDEO_DECODER_BUFFER_BITSTREAM;
         if (FAILED(ID3D11VideoContext_GetDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context,
                                                        D3D11VA_CONTEXT(ctx)->decoder,
                                                        type,
                                                        &dxva_size, &dxva_data_ptr)))
             return -1;
     }
 #endif
 #if CONFIG_DXVA2
     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
         type = DXVA2_BitStreamDateBufferType;
         if (FAILED(IDirectXVideoDecoder_GetBuffer(DXVA2_CONTEXT(ctx)->decoder,
                                                   type,
                                                   &dxva_data_ptr, &dxva_size)))
             return -1;
     }
 #endif

 
     dxva_data = dxva_data_ptr;

     current = dxva_data;
     end = dxva_data + dxva_size;
 
     for (i = 0; i < ctx_pic->slice_count; i++) {
         static const uint8_t start_code[] = { 0, 0, 1 };
         static const unsigned start_code_size = sizeof(start_code);
         unsigned position, size;
 
         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 

         if (is_slice_short(avctx, ctx))

             slice = &ctx_pic->slice_short[i];
         else
             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 
         position = slice->BSNALunitDataLocation;
         size     = slice->SliceBytesInBuffer;
         if (start_code_size + size > end - current) {
             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
             break;
         }
 
         slice->BSNALunitDataLocation = current - dxva_data;
         slice->SliceBytesInBuffer    = start_code_size + size;
 

         if (!is_slice_short(avctx, ctx)) {

             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
             if (i < ctx_pic->slice_count - 1)
                 slice_long->NumMbsForSlice =
                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
             else
                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
         }
 
         memcpy(current, start_code, start_code_size);
         current += start_code_size;
 
         memcpy(current, &ctx_pic->bitstream[position], size);
         current += size;
     }
     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
     if (slice && padding > 0) {
         memset(current, 0, padding);
         current += padding;
 
         slice->SliceBytesInBuffer += padding;
     }

 #if CONFIG_D3D11VA

     if (ff_dxva2_is_d3d11(avctx))

         if (FAILED(ID3D11VideoContext_ReleaseDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context, D3D11VA_CONTEXT(ctx)->decoder, type)))
             return -1;
 #endif
 #if CONFIG_DXVA2
     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD)
         if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(DXVA2_CONTEXT(ctx)->decoder, type)))
             return -1;
 #endif

     if (i < ctx_pic->slice_count)
         return -1;
 

 #if CONFIG_D3D11VA

     if (ff_dxva2_is_d3d11(avctx)) {

         D3D11_VIDEO_DECODER_BUFFER_DESC *dsc11 = bs;
         memset(dsc11, 0, sizeof(*dsc11));
         dsc11->BufferType           = type;
         dsc11->DataSize             = current - dxva_data;
         dsc11->NumMBsInBuffer       = mb_count;

         type = D3D11_VIDEO_DECODER_BUFFER_SLICE_CONTROL;

 
         av_assert0((dsc11->DataSize & 127) == 0);

     }
 #endif
 #if CONFIG_DXVA2
     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
         DXVA2_DecodeBufferDesc *dsc2 = bs;
         memset(dsc2, 0, sizeof(*dsc2));
         dsc2->CompressedBufferType = type;
         dsc2->DataSize             = current - dxva_data;
         dsc2->NumMBsInBuffer       = mb_count;
 
         type = DXVA2_SliceControlBufferType;

 
         av_assert0((dsc2->DataSize & 127) == 0);

     }
 #endif
 
     if (is_slice_short(avctx, ctx)) {

         slice_data = ctx_pic->slice_short;
         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
     } else {
         slice_data = ctx_pic->slice_long;
         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
     }

     return ff_dxva2_commit_buffer(avctx, ctx, sc,

                                   type,

                                   slice_data, slice_size, mb_count);

 }
 
 

 static int dxva2_h264_start_frame(AVCodecContext *avctx,
                                   av_unused const uint8_t *buffer,
                                   av_unused uint32_t size)

 {
     const H264Context *h = avctx->priv_data;

     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);

     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;

     if (!DXVA_CONTEXT_VALID(avctx, ctx))

         return -1;
     assert(ctx_pic);
 
     /* Fill up DXVA_PicParams_H264 */

     fill_picture_parameters(avctx, ctx, h, &ctx_pic->pp);

 
     /* Fill up DXVA_Qmatrix_H264 */

     fill_scaling_lists(avctx, ctx, h, &ctx_pic->qm);

 
     ctx_pic->slice_count    = 0;
     ctx_pic->bitstream_size = 0;
     ctx_pic->bitstream      = NULL;
     return 0;
 }
 

 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
                                    const uint8_t *buffer,
                                    uint32_t size)

 {

     const H264Context *h = avctx->priv_data;

     const H264SliceContext *sl = &h->slice_ctx[0];

     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);

     const H264Picture *current_picture = h->cur_pic_ptr;

     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;

     unsigned position;
 
     if (ctx_pic->slice_count >= MAX_SLICES)
         return -1;
 
     if (!ctx_pic->bitstream)
         ctx_pic->bitstream = buffer;
     ctx_pic->bitstream_size += size;
 
     position = buffer - ctx_pic->bitstream;

     if (is_slice_short(avctx, ctx))

         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
                          position, size);
     else
         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],

                         &ctx_pic->pp, position, size);

     ctx_pic->slice_count++;
 

     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)

         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
     return 0;
 }
 

 static int dxva2_h264_end_frame(AVCodecContext *avctx)

 {
     H264Context *h = avctx->priv_data;

     H264SliceContext *sl = &h->slice_ctx[0];

     struct dxva2_picture_context *ctx_pic =

         h->cur_pic_ptr->hwaccel_picture_private;

     int ret;

 
     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
         return -1;

     ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr->f,

                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
                                     commit_bitstream_and_slice_buffer);
     if (!ret)

         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);

     return ret;

 }
 

 #if CONFIG_H264_DXVA2_HWACCEL

 const AVHWAccel ff_h264_dxva2_hwaccel = {

     .name           = "h264_dxva2",

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_H264,

     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,

     .init           = ff_dxva2_decode_init,
     .uninit         = ff_dxva2_decode_uninit,

     .start_frame    = dxva2_h264_start_frame,
     .decode_slice   = dxva2_h264_decode_slice,
     .end_frame      = dxva2_h264_end_frame,

     .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

 #endif
 
 #if CONFIG_H264_D3D11VA_HWACCEL

 const AVHWAccel ff_h264_d3d11va_hwaccel = {

     .name           = "h264_d3d11va",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_H264,
     .pix_fmt        = AV_PIX_FMT_D3D11VA_VLD,

     .init           = ff_dxva2_decode_init,
     .uninit         = ff_dxva2_decode_uninit,

     .start_frame    = dxva2_h264_start_frame,
     .decode_slice   = dxva2_h264_decode_slice,
     .end_frame      = dxva2_h264_end_frame,

     .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),
 };
 #endif
 
 #if CONFIG_H264_D3D11VA2_HWACCEL

 const AVHWAccel ff_h264_d3d11va2_hwaccel = {

     .name           = "h264_d3d11va2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_H264,
     .pix_fmt        = AV_PIX_FMT_D3D11,
     .init           = ff_dxva2_decode_init,
     .uninit         = ff_dxva2_decode_uninit,
     .start_frame    = dxva2_h264_start_frame,
     .decode_slice   = dxva2_h264_decode_slice,
     .end_frame      = dxva2_h264_end_frame,

     .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
     .priv_data_size = sizeof(FFDXVASharedContext),

 };
 #endif