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   1 /*
   2  * DXVA2 H264 HW acceleration.
   3  *
   4  * copyright (c) 2009 Laurent Aimar
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "libavutil/avassert.h"
  24
  25 #include "h264.h"
  26 #include "h264data.h"
  27 #include "mpegutils.h"
  28
  29 // The headers above may include w32threads.h, which uses the original
  30 // _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
  31 // potentially newer version.
  32 #include "dxva2_internal.h"
  33
  34 struct dxva2_picture_context {
  35     DXVA_PicParams_H264   pp;
  36     DXVA_Qmatrix_H264     qm;
  37     unsigned              slice_count;
  38     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
  39     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
  40     const uint8_t         *bitstream;
  41     unsigned              bitstream_size;
  42 };
  43
  44 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
  45                                unsigned index, unsigned flag)
  46 {
  47     assert((index&0x7f) == index && (flag&0x01) == flag);
  48     pic->bPicEntry = index | (flag << 7);
  49 }
  50
  51 static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h,
  52                                     DXVA_PicParams_H264 *pp)
  53 {
  54     const H264Picture *current_picture = h->cur_pic_ptr;
  55     const SPS *sps = h->ps.sps;
  56     const PPS *pps = h->ps.pps;
  57     int i, j;
  58
  59     memset(pp, 0, sizeof(*pp));
  60     /* Configure current picture */
  61     fill_picture_entry(&pp->CurrPic,
  62                        ff_dxva2_get_surface_index(avctx, ctx, current_picture->f),
  63                        h->picture_structure == PICT_BOTTOM_FIELD);
  64     /* Configure the set of references */
  65     pp->UsedForReferenceFlags  = 0;
  66     pp->NonExistingFrameFlags  = 0;
  67     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  68         const H264Picture *r;
  69         if (j < h->short_ref_count) {
  70             r = h->short_ref[j++];
  71         } else {
  72             r = NULL;
  73             while (!r && j < h->short_ref_count + 16)
  74                 r = h->long_ref[j++ - h->short_ref_count];
  75         }
  76         if (r) {
  77             fill_picture_entry(&pp->RefFrameList[i],
  78                                ff_dxva2_get_surface_index(avctx, ctx, r->f),
  79                                r->long_ref != 0);
  80
  81             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  82                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  83             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
  84                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
  85
  86             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
  87             if (r->reference & PICT_TOP_FIELD)
  88                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  89             if (r->reference & PICT_BOTTOM_FIELD)
  90                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
  91         } else {
  92             pp->RefFrameList[i].bPicEntry = 0xff;
  93             pp->FieldOrderCntList[i][0]   = 0;
  94             pp->FieldOrderCntList[i][1]   = 0;
  95             pp->FrameNumList[i]           = 0;
  96         }
  97     }
  98
  99     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
 100     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;
 101     pp->num_ref_frames                = sps->ref_frame_count;
 102
 103     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |
 104                                         ((sps->mb_aff &&
 105                                         (h->picture_structure == PICT_FRAME)) <<  1) |
 106                                         (sps->residual_color_transform_flag   <<  2) |
 107                                         /* sp_for_switch_flag (not implemented by FFmpeg) */
 108                                         (0                                    <<  3) |
 109                                         (sps->chroma_format_idc               <<  4) |
 110                                         ((h->nal_ref_idc != 0)                <<  6) |
 111                                         (pps->constrained_intra_pred          <<  7) |
 112                                         (pps->weighted_pred                   <<  8) |
 113                                         (pps->weighted_bipred_idc             <<  9) |
 114                                         /* MbsConsecutiveFlag */
 115                                         (1                                    << 11) |
 116                                         (sps->frame_mbs_only_flag             << 12) |
 117                                         (pps->transform_8x8_mode              << 13) |
 118                                         ((sps->level_idc >= 31)               << 14) |
 119                                         /* IntraPicFlag (Modified if we detect a non
 120                                          * intra slice in dxva2_h264_decode_slice) */
 121                                         (1                                    << 15);
 122
 123     pp->bit_depth_luma_minus8         = sps->bit_depth_luma - 8;
 124     pp->bit_depth_chroma_minus8       = sps->bit_depth_chroma - 8;
 125     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
 126         pp->Reserved16Bits            = 0;
 127     else if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 128         pp->Reserved16Bits            = 0x34c;
 129     else
 130         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
 131     pp->StatusReportFeedbackNumber    = 1 + DXVA_CONTEXT_REPORT_ID(avctx, ctx)++;
 132     pp->CurrFieldOrderCnt[0] = 0;
 133     if ((h->picture_structure & PICT_TOP_FIELD) &&
 134         current_picture->field_poc[0] != INT_MAX)
 135         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 136     pp->CurrFieldOrderCnt[1] = 0;
 137     if ((h->picture_structure & PICT_BOTTOM_FIELD) &&
 138         current_picture->field_poc[1] != INT_MAX)
 139         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 140     pp->pic_init_qs_minus26           = pps->init_qs - 26;
 141     pp->chroma_qp_index_offset        = pps->chroma_qp_index_offset[0];
 142     pp->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];
 143     pp->ContinuationFlag              = 1;
 144     pp->pic_init_qp_minus26           = pps->init_qp - 26;
 145     pp->num_ref_idx_l0_active_minus1  = pps->ref_count[0] - 1;
 146     pp->num_ref_idx_l1_active_minus1  = pps->ref_count[1] - 1;
 147     pp->Reserved8BitsA                = 0;
 148     pp->frame_num                     = h->poc.frame_num;
 149     pp->log2_max_frame_num_minus4     = sps->log2_max_frame_num - 4;
 150     pp->pic_order_cnt_type            = sps->poc_type;
 151     if (sps->poc_type == 0)
 152         pp->log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
 153     else if (sps->poc_type == 1)
 154         pp->delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
 155     pp->direct_8x8_inference_flag     = sps->direct_8x8_inference_flag;
 156     pp->entropy_coding_mode_flag      = pps->cabac;
 157     pp->pic_order_present_flag        = pps->pic_order_present;
 158     pp->num_slice_groups_minus1       = pps->slice_group_count - 1;
 159     pp->slice_group_map_type          = pps->mb_slice_group_map_type;
 160     pp->deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
 161     pp->redundant_pic_cnt_present_flag= pps->redundant_pic_cnt_present;
 162     pp->Reserved8BitsB                = 0;
 163     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
 164     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
 165 }
 166
 167 static void fill_scaling_lists(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
 168 {
 169     const PPS *pps = h->ps.pps;
 170     unsigned i, j;
 171     memset(qm, 0, sizeof(*qm));
 172     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
 173         for (i = 0; i < 6; i++)
 174             for (j = 0; j < 16; j++)
 175                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][j];
 176
 177         for (i = 0; i < 64; i++) {
 178             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][i];
 179             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][i];
 180         }
 181     } else {
 182         for (i = 0; i < 6; i++)
 183             for (j = 0; j < 16; j++)
 184                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][ff_zigzag_scan[j]];
 185
 186         for (i = 0; i < 64; i++) {
 187             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][ff_zigzag_direct[i]];
 188             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][ff_zigzag_direct[i]];
 189         }
 190     }
 191 }
 192
 193 static int is_slice_short(const AVCodecContext *avctx, AVDXVAContext *ctx)
 194 {
 195     assert(DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 1 ||
 196            DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2);
 197     return DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2;
 198 }
 199
 200 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 201                              unsigned position, unsigned size)
 202 {
 203     memset(slice, 0, sizeof(*slice));
 204     slice->BSNALunitDataLocation = position;
 205     slice->SliceBytesInBuffer    = size;
 206     slice->wBadSliceChopping     = 0;
 207 }
 208
 209 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
 210 {
 211     int i;
 212     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
 213         if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
 214           return i;
 215     }
 216     return 0x7f;
 217 }
 218
 219 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 220                             const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
 221 {
 222     const H264Context *h = avctx->priv_data;
 223     H264SliceContext *sl = &h->slice_ctx[0];
 224     AVDXVAContext *ctx = avctx->hwaccel_context;
 225     unsigned list;
 226
 227     memset(slice, 0, sizeof(*slice));
 228     slice->BSNALunitDataLocation = position;
 229     slice->SliceBytesInBuffer    = size;
 230     slice->wBadSliceChopping     = 0;
 231
 232     slice->first_mb_in_slice     = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
 233     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 234     slice->BitOffsetToSliceData  = get_bits_count(&sl->gb) - 8;
 235     slice->slice_type            = ff_h264_get_slice_type(sl);
 236     if (sl->slice_type_fixed)
 237         slice->slice_type += 5;
 238     slice->luma_log2_weight_denom       = sl->pwt.luma_log2_weight_denom;
 239     slice->chroma_log2_weight_denom     = sl->pwt.chroma_log2_weight_denom;
 240     if (sl->list_count > 0)
 241         slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
 242     if (sl->list_count > 1)
 243         slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;
 244     slice->slice_alpha_c0_offset_div2   = sl->slice_alpha_c0_offset / 2;
 245     slice->slice_beta_offset_div2       = sl->slice_beta_offset     / 2;
 246     slice->Reserved8Bits                = 0;
 247
 248     for (list = 0; list < 2; list++) {
 249         unsigned i;
 250         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 251             if (list < sl->list_count && i < sl->ref_count[list]) {
 252                 const H264Picture *r = sl->ref_list[list][i].parent;
 253                 unsigned plane;
 254                 unsigned index;
 255                 if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 256                     index = ff_dxva2_get_surface_index(avctx, ctx, r->f);
 257                 else
 258                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, r->f));
 259                 fill_picture_entry(&slice->RefPicList[list][i], index,
 260                                    sl->ref_list[list][i].reference == PICT_BOTTOM_FIELD);
 261                 for (plane = 0; plane < 3; plane++) {
 262                     int w, o;
 263                     if (plane == 0 && sl->pwt.luma_weight_flag[list]) {
 264                         w = sl->pwt.luma_weight[i][list][0];
 265                         o = sl->pwt.luma_weight[i][list][1];
 266                     } else if (plane >= 1 && sl->pwt.chroma_weight_flag[list]) {
 267                         w = sl->pwt.chroma_weight[i][list][plane-1][0];
 268                         o = sl->pwt.chroma_weight[i][list][plane-1][1];
 269                     } else {
 270                         w = 1 << (plane == 0 ? sl->pwt.luma_log2_weight_denom :
 271                                                sl->pwt.chroma_log2_weight_denom);
 272                         o = 0;
 273                     }
 274                     slice->Weights[list][i][plane][0] = w;
 275                     slice->Weights[list][i][plane][1] = o;
 276                 }
 277             } else {
 278                 unsigned plane;
 279                 slice->RefPicList[list][i].bPicEntry = 0xff;
 280                 for (plane = 0; plane < 3; plane++) {
 281                     slice->Weights[list][i][plane][0] = 0;
 282                     slice->Weights[list][i][plane][1] = 0;
 283                 }
 284             }
 285         }
 286     }
 287     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 288     slice->slice_qp_delta    = sl->qscale - h->ps.pps->init_qp;
 289     slice->redundant_pic_cnt = sl->redundant_pic_count;
 290     if (sl->slice_type == AV_PICTURE_TYPE_B)
 291         slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;
 292     slice->cabac_init_idc = h->ps.pps->cabac ? sl->cabac_init_idc : 0;
 293     if (sl->deblocking_filter < 2)
 294         slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;
 295     else
 296         slice->disable_deblocking_filter_idc = sl->deblocking_filter;
 297     slice->slice_id = h->current_slice - 1;
 298 }
 299
 300 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 301                                              DECODER_BUFFER_DESC *bs,
 302                                              DECODER_BUFFER_DESC *sc)
 303 {
 304     const H264Context *h = avctx->priv_data;
 305     const unsigned mb_count = h->mb_width * h->mb_height;
 306     AVDXVAContext *ctx = avctx->hwaccel_context;
 307     const H264Picture *current_picture = h->cur_pic_ptr;
 308     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 309     DXVA_Slice_H264_Short *slice = NULL;
 310     void     *dxva_data_ptr = NULL;
 311     uint8_t  *dxva_data, *current, *end;
 312     unsigned dxva_size = 0;
 313     void     *slice_data;
 314     unsigned slice_size;
 315     unsigned padding;
 316     unsigned i;
 317     unsigned type;
 318
 319     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 320 #if CONFIG_D3D11VA
 321     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
 322         type = D3D11_VIDEO_DECODER_BUFFER_BITSTREAM;
 323         if (FAILED(ID3D11VideoContext_GetDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context,
 324                                                        D3D11VA_CONTEXT(ctx)->decoder,
 325                                                        type,
 326                                                        &dxva_size, &dxva_data_ptr)))
 327             return -1;
 328     }
 329 #endif
 330 #if CONFIG_DXVA2
 331     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 332         type = DXVA2_BitStreamDateBufferType;
 333         if (FAILED(IDirectXVideoDecoder_GetBuffer(DXVA2_CONTEXT(ctx)->decoder,
 334                                                   type,
 335                                                   &dxva_data_ptr, &dxva_size)))
 336             return -1;
 337     }
 338 #endif
 339
 340     dxva_data = dxva_data_ptr;
 341     current = dxva_data;
 342     end = dxva_data + dxva_size;
 343
 344     for (i = 0; i < ctx_pic->slice_count; i++) {
 345         static const uint8_t start_code[] = { 0, 0, 1 };
 346         static const unsigned start_code_size = sizeof(start_code);
 347         unsigned position, size;
 348
 349         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 350                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 351         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 352                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 353
 354         if (is_slice_short(avctx, ctx))
 355             slice = &ctx_pic->slice_short[i];
 356         else
 357             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 358
 359         position = slice->BSNALunitDataLocation;
 360         size     = slice->SliceBytesInBuffer;
 361         if (start_code_size + size > end - current) {
 362             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 363             break;
 364         }
 365
 366         slice->BSNALunitDataLocation = current - dxva_data;
 367         slice->SliceBytesInBuffer    = start_code_size + size;
 368
 369         if (!is_slice_short(avctx, ctx)) {
 370             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 371             if (i < ctx_pic->slice_count - 1)
 372                 slice_long->NumMbsForSlice =
 373                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 374             else
 375                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 376         }
 377
 378         memcpy(current, start_code, start_code_size);
 379         current += start_code_size;
 380
 381         memcpy(current, &ctx_pic->bitstream[position], size);
 382         current += size;
 383     }
 384     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 385     if (slice && padding > 0) {
 386         memset(current, 0, padding);
 387         current += padding;
 388
 389         slice->SliceBytesInBuffer += padding;
 390     }
 391 #if CONFIG_D3D11VA
 392     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD)
 393         if (FAILED(ID3D11VideoContext_ReleaseDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context, D3D11VA_CONTEXT(ctx)->decoder, type)))
 394             return -1;
 395 #endif
 396 #if CONFIG_DXVA2
 397     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD)
 398         if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(DXVA2_CONTEXT(ctx)->decoder, type)))
 399             return -1;
 400 #endif
 401     if (i < ctx_pic->slice_count)
 402         return -1;
 403
 404 #if CONFIG_D3D11VA
 405     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
 406         D3D11_VIDEO_DECODER_BUFFER_DESC *dsc11 = bs;
 407         memset(dsc11, 0, sizeof(*dsc11));
 408         dsc11->BufferType           = type;
 409         dsc11->DataSize             = current - dxva_data;
 410         dsc11->NumMBsInBuffer       = mb_count;
 411
 412         type = D3D11_VIDEO_DECODER_BUFFER_SLICE_CONTROL;
 413
 414         av_assert0((dsc11->DataSize & 127) == 0);
 415     }
 416 #endif
 417 #if CONFIG_DXVA2
 418     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 419         DXVA2_DecodeBufferDesc *dsc2 = bs;
 420         memset(dsc2, 0, sizeof(*dsc2));
 421         dsc2->CompressedBufferType = type;
 422         dsc2->DataSize             = current - dxva_data;
 423         dsc2->NumMBsInBuffer       = mb_count;
 424
 425         type = DXVA2_SliceControlBufferType;
 426
 427         av_assert0((dsc2->DataSize & 127) == 0);
 428     }
 429 #endif
 430
 431     if (is_slice_short(avctx, ctx)) {
 432         slice_data = ctx_pic->slice_short;
 433         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 434     } else {
 435         slice_data = ctx_pic->slice_long;
 436         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 437     }
 438     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 439                                   type,
 440                                   slice_data, slice_size, mb_count);
 441 }
 442
 443
 444 static int dxva2_h264_start_frame(AVCodecContext *avctx,
 445                                   av_unused const uint8_t *buffer,
 446                                   av_unused uint32_t size)
 447 {
 448     const H264Context *h = avctx->priv_data;
 449     AVDXVAContext *ctx = avctx->hwaccel_context;
 450     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
 451
 452     if (DXVA_CONTEXT_DECODER(avctx, ctx) == NULL ||
 453         DXVA_CONTEXT_CFG(avctx, ctx) == NULL ||
 454         DXVA_CONTEXT_COUNT(avctx, ctx) <= 0)
 455         return -1;
 456     assert(ctx_pic);
 457
 458     /* Fill up DXVA_PicParams_H264 */
 459     fill_picture_parameters(avctx, ctx, h, &ctx_pic->pp);
 460
 461     /* Fill up DXVA_Qmatrix_H264 */
 462     fill_scaling_lists(avctx, ctx, h, &ctx_pic->qm);
 463
 464     ctx_pic->slice_count    = 0;
 465     ctx_pic->bitstream_size = 0;
 466     ctx_pic->bitstream      = NULL;
 467     return 0;
 468 }
 469
 470 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
 471                                    const uint8_t *buffer,
 472                                    uint32_t size)
 473 {
 474     const H264Context *h = avctx->priv_data;
 475     const H264SliceContext *sl = &h->slice_ctx[0];
 476     AVDXVAContext *ctx = avctx->hwaccel_context;
 477     const H264Picture *current_picture = h->cur_pic_ptr;
 478     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 479     unsigned position;
 480
 481     if (ctx_pic->slice_count >= MAX_SLICES)
 482         return -1;
 483
 484     if (!ctx_pic->bitstream)
 485         ctx_pic->bitstream = buffer;
 486     ctx_pic->bitstream_size += size;
 487
 488     position = buffer - ctx_pic->bitstream;
 489     if (is_slice_short(avctx, ctx))
 490         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 491                          position, size);
 492     else
 493         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 494                         &ctx_pic->pp, position, size);
 495     ctx_pic->slice_count++;
 496
 497     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
 498         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 499     return 0;
 500 }
 501
 502 static int dxva2_h264_end_frame(AVCodecContext *avctx)
 503 {
 504     H264Context *h = avctx->priv_data;
 505     H264SliceContext *sl = &h->slice_ctx[0];
 506     struct dxva2_picture_context *ctx_pic =
 507         h->cur_pic_ptr->hwaccel_picture_private;
 508     int ret;
 509
 510     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 511         return -1;
 512     ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr->f,
 513                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 514                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 515                                     commit_bitstream_and_slice_buffer);
 516     if (!ret)
 517         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
 518     return ret;
 519 }
 520
 521 #if CONFIG_H264_DXVA2_HWACCEL
 522 AVHWAccel ff_h264_dxva2_hwaccel = {
 523     .name           = "h264_dxva2",
 524     .type           = AVMEDIA_TYPE_VIDEO,
 525     .id             = AV_CODEC_ID_H264,
 526     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 527     .start_frame    = dxva2_h264_start_frame,
 528     .decode_slice   = dxva2_h264_decode_slice,
 529     .end_frame      = dxva2_h264_end_frame,
 530     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 531 };
 532 #endif
 533
 534 #if CONFIG_H264_D3D11VA_HWACCEL
 535 AVHWAccel ff_h264_d3d11va_hwaccel = {
 536     .name           = "h264_d3d11va",
 537     .type           = AVMEDIA_TYPE_VIDEO,
 538     .id             = AV_CODEC_ID_H264,
 539     .pix_fmt        = AV_PIX_FMT_D3D11VA_VLD,
 540     .start_frame    = dxva2_h264_start_frame,
 541     .decode_slice   = dxva2_h264_decode_slice,
 542     .end_frame      = dxva2_h264_end_frame,
 543     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 544 };
 545 #endif