git.sesse.net Git - ffmpeg/blob - libavcodec/dxva2_h264.c

   1 /*
   2  * DXVA2 H.264 HW acceleration.
   3  *
   4  * copyright (c) 2009 Laurent Aimar
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "h264dec.h"
  24 #include "h264data.h"
  25 #include "mpegutils.h"
  26
  27 // The headers above may include w32threads.h, which uses the original
  28 // _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
  29 // potentially newer version.
  30 #include "dxva2_internal.h"
  31
  32 struct dxva2_picture_context {
  33     DXVA_PicParams_H264   pp;
  34     DXVA_Qmatrix_H264     qm;
  35     unsigned              slice_count;
  36     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
  37     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
  38     const uint8_t         *bitstream;
  39     unsigned              bitstream_size;
  40 };
  41
  42 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
  43                                unsigned index, unsigned flag)
  44 {
  45     assert((index&0x7f) == index && (flag&0x01) == flag);
  46     pic->bPicEntry = index | (flag << 7);
  47 }
  48
  49 static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h,
  50                                     DXVA_PicParams_H264 *pp)
  51 {
  52     const H264Picture *current_picture = h->cur_pic_ptr;
  53     const SPS *sps = h->ps.sps;
  54     const PPS *pps = h->ps.pps;
  55     int i, j;
  56
  57     memset(pp, 0, sizeof(*pp));
  58     /* Configure current picture */
  59     fill_picture_entry(&pp->CurrPic,
  60                        ff_dxva2_get_surface_index(avctx, ctx, current_picture->f),
  61                        h->picture_structure == PICT_BOTTOM_FIELD);
  62     /* Configure the set of references */
  63     pp->UsedForReferenceFlags  = 0;
  64     pp->NonExistingFrameFlags  = 0;
  65     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  66         const H264Picture *r;
  67         if (j < h->short_ref_count) {
  68             r = h->short_ref[j++];
  69         } else {
  70             r = NULL;
  71             while (!r && j < h->short_ref_count + 16)
  72                 r = h->long_ref[j++ - h->short_ref_count];
  73         }
  74         if (r) {
  75             fill_picture_entry(&pp->RefFrameList[i],
  76                                ff_dxva2_get_surface_index(avctx, ctx, r->f),
  77                                r->long_ref != 0);
  78
  79             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  80                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  81             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
  82                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
  83
  84             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
  85             if (r->reference & PICT_TOP_FIELD)
  86                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  87             if (r->reference & PICT_BOTTOM_FIELD)
  88                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
  89         } else {
  90             pp->RefFrameList[i].bPicEntry = 0xff;
  91             pp->FieldOrderCntList[i][0]   = 0;
  92             pp->FieldOrderCntList[i][1]   = 0;
  93             pp->FrameNumList[i]           = 0;
  94         }
  95     }
  96
  97     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
  98     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;
  99     pp->num_ref_frames                = sps->ref_frame_count;
 100
 101     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |
 102                                         ((sps->mb_aff &&
 103                                         (h->picture_structure == PICT_FRAME)) <<  1) |
 104                                         (sps->residual_color_transform_flag   <<  2) |
 105                                         /* sp_for_switch_flag (not implemented by Libav) */
 106                                         (0                                    <<  3) |
 107                                         (sps->chroma_format_idc               <<  4) |
 108                                         ((h->nal_ref_idc != 0)                <<  6) |
 109                                         (pps->constrained_intra_pred          <<  7) |
 110                                         (pps->weighted_pred                   <<  8) |
 111                                         (pps->weighted_bipred_idc             <<  9) |
 112                                         /* MbsConsecutiveFlag */
 113                                         (1                                    << 11) |
 114                                         (sps->frame_mbs_only_flag             << 12) |
 115                                         (pps->transform_8x8_mode              << 13) |
 116                                         ((sps->level_idc >= 31)               << 14) |
 117                                         /* IntraPicFlag (Modified if we detect a non
 118                                          * intra slice in dxva2_h264_decode_slice) */
 119                                         (1                                    << 15);
 120
 121     pp->bit_depth_luma_minus8         = sps->bit_depth_luma - 8;
 122     pp->bit_depth_chroma_minus8       = sps->bit_depth_chroma - 8;
 123     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
 124         pp->Reserved16Bits            = 0;
 125     else if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 126         pp->Reserved16Bits            = 0x34c;
 127     else
 128         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
 129     pp->StatusReportFeedbackNumber    = 1 + DXVA_CONTEXT_REPORT_ID(avctx, ctx)++;
 130     pp->CurrFieldOrderCnt[0] = 0;
 131     if ((h->picture_structure & PICT_TOP_FIELD) &&
 132         current_picture->field_poc[0] != INT_MAX)
 133         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 134     pp->CurrFieldOrderCnt[1] = 0;
 135     if ((h->picture_structure & PICT_BOTTOM_FIELD) &&
 136         current_picture->field_poc[1] != INT_MAX)
 137         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 138     pp->pic_init_qs_minus26           = pps->init_qs - 26;
 139     pp->chroma_qp_index_offset        = pps->chroma_qp_index_offset[0];
 140     pp->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];
 141     pp->ContinuationFlag              = 1;
 142     pp->pic_init_qp_minus26           = pps->init_qp - 26;
 143     pp->num_ref_idx_l0_active_minus1  = pps->ref_count[0] - 1;
 144     pp->num_ref_idx_l1_active_minus1  = pps->ref_count[1] - 1;
 145     pp->Reserved8BitsA                = 0;
 146     pp->frame_num                     = h->poc.frame_num;
 147     pp->log2_max_frame_num_minus4     = sps->log2_max_frame_num - 4;
 148     pp->pic_order_cnt_type            = sps->poc_type;
 149     if (sps->poc_type == 0)
 150         pp->log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
 151     else if (sps->poc_type == 1)
 152         pp->delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
 153     pp->direct_8x8_inference_flag     = sps->direct_8x8_inference_flag;
 154     pp->entropy_coding_mode_flag      = pps->cabac;
 155     pp->pic_order_present_flag        = pps->pic_order_present;
 156     pp->num_slice_groups_minus1       = pps->slice_group_count - 1;
 157     pp->slice_group_map_type          = pps->mb_slice_group_map_type;
 158     pp->deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
 159     pp->redundant_pic_cnt_present_flag= pps->redundant_pic_cnt_present;
 160     pp->Reserved8BitsB                = 0;
 161     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by Libav */
 162     //pp->SliceGroupMap[810];               /* XXX not implemented by Libav */
 163 }
 164
 165 static void fill_scaling_lists(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
 166 {
 167     unsigned i, j;
 168     const SPS *sps = h->ps.sps;
 169     const PPS *pps = h->ps.pps;
 170     memset(qm, 0, sizeof(*qm));
 171     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
 172         for (i = 0; i < 6; i++)
 173             for (j = 0; j < 16; j++)
 174                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][j];
 175
 176         for (i = 0; i < 64; i++) {
 177             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][i];
 178             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][i];
 179         }
 180     } else {
 181         for (i = 0; i < 6; i++)
 182             for (j = 0; j < 16; j++)
 183                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][ff_zigzag_scan[j]];
 184
 185         for (i = 0; i < 64; i++) {
 186             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][ff_zigzag_direct[i]];
 187             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][ff_zigzag_direct[i]];
 188         }
 189     }
 190 }
 191
 192 static int is_slice_short(const AVCodecContext *avctx, AVDXVAContext *ctx)
 193 {
 194     assert(DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 1 ||
 195            DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2);
 196     return DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2;
 197 }
 198
 199 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 200                              unsigned position, unsigned size)
 201 {
 202     memset(slice, 0, sizeof(*slice));
 203     slice->BSNALunitDataLocation = position;
 204     slice->SliceBytesInBuffer    = size;
 205     slice->wBadSliceChopping     = 0;
 206 }
 207
 208 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
 209 {
 210     int i;
 211     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
 212         if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
 213           return i;
 214     }
 215     return 0x7f;
 216 }
 217
 218 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 219                             const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
 220 {
 221     const H264Context *h = avctx->priv_data;
 222     H264SliceContext *sl = &h->slice_ctx[0];
 223     AVDXVAContext *ctx = avctx->hwaccel_context;
 224     unsigned list;
 225
 226     memset(slice, 0, sizeof(*slice));
 227     slice->BSNALunitDataLocation = position;
 228     slice->SliceBytesInBuffer    = size;
 229     slice->wBadSliceChopping     = 0;
 230
 231     slice->first_mb_in_slice     = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
 232     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 233     slice->BitOffsetToSliceData  = get_bits_count(&sl->gb);
 234     slice->slice_type            = ff_h264_get_slice_type(sl);
 235     if (sl->slice_type_fixed)
 236         slice->slice_type += 5;
 237     slice->luma_log2_weight_denom       = sl->pwt.luma_log2_weight_denom;
 238     slice->chroma_log2_weight_denom     = sl->pwt.chroma_log2_weight_denom;
 239     if (sl->list_count > 0)
 240         slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
 241     if (sl->list_count > 1)
 242         slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;
 243     slice->slice_alpha_c0_offset_div2   = sl->slice_alpha_c0_offset / 2;
 244     slice->slice_beta_offset_div2       = sl->slice_beta_offset     / 2;
 245     slice->Reserved8Bits                = 0;
 246
 247     for (list = 0; list < 2; list++) {
 248         unsigned i;
 249         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 250             if (list < sl->list_count && i < sl->ref_count[list]) {
 251                 const H264Picture *r = sl->ref_list[list][i].parent;
 252                 unsigned plane;
 253                 unsigned index;
 254                 if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 255                     index = ff_dxva2_get_surface_index(avctx, ctx, r->f);
 256                 else
 257                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, r->f));
 258                 fill_picture_entry(&slice->RefPicList[list][i], index,
 259                                    r->reference == PICT_BOTTOM_FIELD);
 260                 for (plane = 0; plane < 3; plane++) {
 261                     int w, o;
 262                     if (plane == 0 && sl->pwt.luma_weight_flag[list]) {
 263                         w = sl->pwt.luma_weight[i][list][0];
 264                         o = sl->pwt.luma_weight[i][list][1];
 265                     } else if (plane >= 1 && sl->pwt.chroma_weight_flag[list]) {
 266                         w = sl->pwt.chroma_weight[i][list][plane-1][0];
 267                         o = sl->pwt.chroma_weight[i][list][plane-1][1];
 268                     } else {
 269                         w = 1 << (plane == 0 ? sl->pwt.luma_log2_weight_denom :
 270                                                sl->pwt.chroma_log2_weight_denom);
 271                         o = 0;
 272                     }
 273                     slice->Weights[list][i][plane][0] = w;
 274                     slice->Weights[list][i][plane][1] = o;
 275                 }
 276             } else {
 277                 unsigned plane;
 278                 slice->RefPicList[list][i].bPicEntry = 0xff;
 279                 for (plane = 0; plane < 3; plane++) {
 280                     slice->Weights[list][i][plane][0] = 0;
 281                     slice->Weights[list][i][plane][1] = 0;
 282                 }
 283             }
 284         }
 285     }
 286     slice->slice_qs_delta    = 0; /* XXX not implemented by Libav */
 287     slice->slice_qp_delta    = sl->qscale - h->ps.pps->init_qp;
 288     slice->redundant_pic_cnt = sl->redundant_pic_count;
 289     if (sl->slice_type == AV_PICTURE_TYPE_B)
 290         slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;
 291     slice->cabac_init_idc = h->ps.pps->cabac ? sl->cabac_init_idc : 0;
 292     if (sl->deblocking_filter < 2)
 293         slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;
 294     else
 295         slice->disable_deblocking_filter_idc = sl->deblocking_filter;
 296     slice->slice_id = h->current_slice - 1;
 297 }
 298
 299 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 300                                              DECODER_BUFFER_DESC *bs,
 301                                              DECODER_BUFFER_DESC *sc)
 302 {
 303     const H264Context *h = avctx->priv_data;
 304     const unsigned mb_count = h->mb_width * h->mb_height;
 305     AVDXVAContext *ctx = avctx->hwaccel_context;
 306     const H264Picture *current_picture = h->cur_pic_ptr;
 307     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 308     DXVA_Slice_H264_Short *slice = NULL;
 309     void     *dxva_data_ptr;
 310     uint8_t  *dxva_data, *current, *end;
 311     unsigned dxva_size;
 312     void     *slice_data;
 313     unsigned slice_size;
 314     unsigned padding;
 315     unsigned i;
 316     unsigned type;
 317
 318     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 319 #if CONFIG_D3D11VA
 320     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
 321         type = D3D11_VIDEO_DECODER_BUFFER_BITSTREAM;
 322         if (FAILED(ID3D11VideoContext_GetDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context,
 323                                                        D3D11VA_CONTEXT(ctx)->decoder,
 324                                                        type,
 325                                                        &dxva_size, &dxva_data_ptr)))
 326             return -1;
 327     }
 328 #endif
 329 #if CONFIG_DXVA2
 330     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 331         type = DXVA2_BitStreamDateBufferType;
 332         if (FAILED(IDirectXVideoDecoder_GetBuffer(DXVA2_CONTEXT(ctx)->decoder,
 333                                                   type,
 334                                                   &dxva_data_ptr, &dxva_size)))
 335             return -1;
 336     }
 337 #endif
 338
 339     dxva_data = dxva_data_ptr;
 340     current = dxva_data;
 341     end = dxva_data + dxva_size;
 342
 343     for (i = 0; i < ctx_pic->slice_count; i++) {
 344         static const uint8_t start_code[] = { 0, 0, 1 };
 345         static const unsigned start_code_size = sizeof(start_code);
 346         unsigned position, size;
 347
 348         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 349                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 350         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 351                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 352
 353         if (is_slice_short(avctx, ctx))
 354             slice = &ctx_pic->slice_short[i];
 355         else
 356             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 357
 358         position = slice->BSNALunitDataLocation;
 359         size     = slice->SliceBytesInBuffer;
 360         if (start_code_size + size > end - current) {
 361             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 362             break;
 363         }
 364
 365         slice->BSNALunitDataLocation = current - dxva_data;
 366         slice->SliceBytesInBuffer    = start_code_size + size;
 367
 368         if (!is_slice_short(avctx, ctx)) {
 369             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 370             if (i < ctx_pic->slice_count - 1)
 371                 slice_long->NumMbsForSlice =
 372                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 373             else
 374                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 375         }
 376
 377         memcpy(current, start_code, start_code_size);
 378         current += start_code_size;
 379
 380         memcpy(current, &ctx_pic->bitstream[position], size);
 381         current += size;
 382     }
 383     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 384     if (slice && padding > 0) {
 385         memset(current, 0, padding);
 386         current += padding;
 387
 388         slice->SliceBytesInBuffer += padding;
 389     }
 390 #if CONFIG_D3D11VA
 391     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD)
 392         if (FAILED(ID3D11VideoContext_ReleaseDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context, D3D11VA_CONTEXT(ctx)->decoder, type)))
 393             return -1;
 394 #endif
 395 #if CONFIG_DXVA2
 396     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD)
 397         if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(DXVA2_CONTEXT(ctx)->decoder, type)))
 398             return -1;
 399 #endif
 400     if (i < ctx_pic->slice_count)
 401         return -1;
 402
 403 #if CONFIG_D3D11VA
 404     if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
 405         D3D11_VIDEO_DECODER_BUFFER_DESC *dsc11 = bs;
 406         memset(dsc11, 0, sizeof(*dsc11));
 407         dsc11->BufferType           = type;
 408         dsc11->DataSize             = current - dxva_data;
 409         dsc11->NumMBsInBuffer       = mb_count;
 410
 411         type = D3D11_VIDEO_DECODER_BUFFER_SLICE_CONTROL;
 412     }
 413 #endif
 414 #if CONFIG_DXVA2
 415     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 416         DXVA2_DecodeBufferDesc *dsc2 = bs;
 417         memset(dsc2, 0, sizeof(*dsc2));
 418         dsc2->CompressedBufferType = type;
 419         dsc2->DataSize             = current - dxva_data;
 420         dsc2->NumMBsInBuffer       = mb_count;
 421
 422         type = DXVA2_SliceControlBufferType;
 423     }
 424 #endif
 425
 426     if (is_slice_short(avctx, ctx)) {
 427         slice_data = ctx_pic->slice_short;
 428         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 429     } else {
 430         slice_data = ctx_pic->slice_long;
 431         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 432     }
 433     assert((bs->DataSize & 127) == 0);
 434     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 435                                   type,
 436                                   slice_data, slice_size, mb_count);
 437 }
 438
 439
 440 static int dxva2_h264_start_frame(AVCodecContext *avctx,
 441                                   av_unused const uint8_t *buffer,
 442                                   av_unused uint32_t size)
 443 {
 444     const H264Context *h = avctx->priv_data;
 445     AVDXVAContext *ctx = avctx->hwaccel_context;
 446     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
 447
 448     if (DXVA_CONTEXT_DECODER(avctx, ctx) == NULL ||
 449         DXVA_CONTEXT_CFG(avctx, ctx) == NULL ||
 450         DXVA_CONTEXT_COUNT(avctx, ctx) <= 0)
 451         return -1;
 452     assert(ctx_pic);
 453
 454     /* Fill up DXVA_PicParams_H264 */
 455     fill_picture_parameters(avctx, ctx, h, &ctx_pic->pp);
 456
 457     /* Fill up DXVA_Qmatrix_H264 */
 458     fill_scaling_lists(avctx, ctx, h, &ctx_pic->qm);
 459
 460     ctx_pic->slice_count    = 0;
 461     ctx_pic->bitstream_size = 0;
 462     ctx_pic->bitstream      = NULL;
 463     return 0;
 464 }
 465
 466 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
 467                                    const uint8_t *buffer,
 468                                    uint32_t size)
 469 {
 470     const H264Context *h = avctx->priv_data;
 471     const H264SliceContext *sl = &h->slice_ctx[0];
 472     AVDXVAContext *ctx = avctx->hwaccel_context;
 473     const H264Picture *current_picture = h->cur_pic_ptr;
 474     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 475     unsigned position;
 476
 477     if (ctx_pic->slice_count >= MAX_SLICES)
 478         return -1;
 479
 480     if (!ctx_pic->bitstream)
 481         ctx_pic->bitstream = buffer;
 482     ctx_pic->bitstream_size += size;
 483
 484     position = buffer - ctx_pic->bitstream;
 485     if (is_slice_short(avctx, ctx))
 486         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 487                          position, size);
 488     else
 489         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 490                         &ctx_pic->pp, position, size);
 491     ctx_pic->slice_count++;
 492
 493     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
 494         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 495     return 0;
 496 }
 497
 498 static int dxva2_h264_end_frame(AVCodecContext *avctx)
 499 {
 500     H264Context *h = avctx->priv_data;
 501     H264SliceContext *sl = &h->slice_ctx[0];
 502     struct dxva2_picture_context *ctx_pic =
 503         h->cur_pic_ptr->hwaccel_picture_private;
 504     int ret;
 505
 506     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 507         return -1;
 508     ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr->f,
 509                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 510                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 511                                     commit_bitstream_and_slice_buffer);
 512     if (!ret)
 513         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
 514     return ret;
 515 }
 516
 517 #if CONFIG_H264_DXVA2_HWACCEL
 518 AVHWAccel ff_h264_dxva2_hwaccel = {
 519     .name           = "h264_dxva2",
 520     .type           = AVMEDIA_TYPE_VIDEO,
 521     .id             = AV_CODEC_ID_H264,
 522     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 523     .start_frame    = dxva2_h264_start_frame,
 524     .decode_slice   = dxva2_h264_decode_slice,
 525     .end_frame      = dxva2_h264_end_frame,
 526     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 527 };
 528 #endif
 529
 530 #if CONFIG_H264_D3D11VA_HWACCEL
 531 AVHWAccel ff_h264_d3d11va_hwaccel = {
 532     .name           = "h264_d3d11va",
 533     .type           = AVMEDIA_TYPE_VIDEO,
 534     .id             = AV_CODEC_ID_H264,
 535     .pix_fmt        = AV_PIX_FMT_D3D11VA_VLD,
 536     .start_frame    = dxva2_h264_start_frame,
 537     .decode_slice   = dxva2_h264_decode_slice,
 538     .end_frame      = dxva2_h264_end_frame,
 539     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 540 };
 541 #endif