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 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 "h264dec.h"
  26 #include "h264data.h"
  27 #include "h264_ps.h"
  28 #include "mpegutils.h"
  29
  30 // The headers above may include w32threads.h, which uses the original
  31 // _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
  32 // potentially newer version.
  33 #include "dxva2_internal.h"
  34
  35 struct dxva2_picture_context {
  36     DXVA_PicParams_H264   pp;
  37     DXVA_Qmatrix_H264     qm;
  38     unsigned              slice_count;
  39     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
  40     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
  41     const uint8_t         *bitstream;
  42     unsigned              bitstream_size;
  43 };
  44
  45 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
  46                                unsigned index, unsigned flag)
  47 {
  48     assert((index&0x7f) == index && (flag&0x01) == flag);
  49     pic->bPicEntry = index | (flag << 7);
  50 }
  51
  52 static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h,
  53                                     DXVA_PicParams_H264 *pp)
  54 {
  55     const H264Picture *current_picture = h->cur_pic_ptr;
  56     const SPS *sps = h->ps.sps;
  57     const PPS *pps = h->ps.pps;
  58     int i, j;
  59
  60     memset(pp, 0, sizeof(*pp));
  61     /* Configure current picture */
  62     fill_picture_entry(&pp->CurrPic,
  63                        ff_dxva2_get_surface_index(avctx, ctx, current_picture->f),
  64                        h->picture_structure == PICT_BOTTOM_FIELD);
  65     /* Configure the set of references */
  66     pp->UsedForReferenceFlags  = 0;
  67     pp->NonExistingFrameFlags  = 0;
  68     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  69         const H264Picture *r;
  70         if (j < h->short_ref_count) {
  71             r = h->short_ref[j++];
  72         } else {
  73             r = NULL;
  74             while (!r && j < h->short_ref_count + 16)
  75                 r = h->long_ref[j++ - h->short_ref_count];
  76         }
  77         if (r) {
  78             fill_picture_entry(&pp->RefFrameList[i],
  79                                ff_dxva2_get_surface_index(avctx, ctx, r->f),
  80                                r->long_ref != 0);
  81
  82             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  83                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  84             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
  85                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
  86
  87             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
  88             if (r->reference & PICT_TOP_FIELD)
  89                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  90             if (r->reference & PICT_BOTTOM_FIELD)
  91                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
  92         } else {
  93             pp->RefFrameList[i].bPicEntry = 0xff;
  94             pp->FieldOrderCntList[i][0]   = 0;
  95             pp->FieldOrderCntList[i][1]   = 0;
  96             pp->FrameNumList[i]           = 0;
  97         }
  98     }
  99
 100     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
 101     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;
 102     pp->num_ref_frames                = sps->ref_frame_count;
 103
 104     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |
 105                                         ((sps->mb_aff &&
 106                                         (h->picture_structure == PICT_FRAME)) <<  1) |
 107                                         (sps->residual_color_transform_flag   <<  2) |
 108                                         /* sp_for_switch_flag (not implemented by FFmpeg) */
 109                                         (0                                    <<  3) |
 110                                         (sps->chroma_format_idc               <<  4) |
 111                                         ((h->nal_ref_idc != 0)                <<  6) |
 112                                         (pps->constrained_intra_pred          <<  7) |
 113                                         (pps->weighted_pred                   <<  8) |
 114                                         (pps->weighted_bipred_idc             <<  9) |
 115                                         /* MbsConsecutiveFlag */
 116                                         (1                                    << 11) |
 117                                         (sps->frame_mbs_only_flag             << 12) |
 118                                         (pps->transform_8x8_mode              << 13) |
 119                                         ((sps->level_idc >= 31)               << 14) |
 120                                         /* IntraPicFlag (Modified if we detect a non
 121                                          * intra slice in dxva2_h264_decode_slice) */
 122                                         (1                                    << 15);
 123
 124     pp->bit_depth_luma_minus8         = sps->bit_depth_luma - 8;
 125     pp->bit_depth_chroma_minus8       = sps->bit_depth_chroma - 8;
 126     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
 127         pp->Reserved16Bits            = 0;
 128     else if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 129         pp->Reserved16Bits            = 0x34c;
 130     else
 131         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
 132     pp->StatusReportFeedbackNumber    = 1 + DXVA_CONTEXT_REPORT_ID(avctx, ctx)++;
 133     pp->CurrFieldOrderCnt[0] = 0;
 134     if ((h->picture_structure & PICT_TOP_FIELD) &&
 135         current_picture->field_poc[0] != INT_MAX)
 136         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 137     pp->CurrFieldOrderCnt[1] = 0;
 138     if ((h->picture_structure & PICT_BOTTOM_FIELD) &&
 139         current_picture->field_poc[1] != INT_MAX)
 140         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 141     pp->pic_init_qs_minus26           = pps->init_qs - 26;
 142     pp->chroma_qp_index_offset        = pps->chroma_qp_index_offset[0];
 143     pp->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];
 144     pp->ContinuationFlag              = 1;
 145     pp->pic_init_qp_minus26           = pps->init_qp - 26;
 146     pp->num_ref_idx_l0_active_minus1  = pps->ref_count[0] - 1;
 147     pp->num_ref_idx_l1_active_minus1  = pps->ref_count[1] - 1;
 148     pp->Reserved8BitsA                = 0;
 149     pp->frame_num                     = h->poc.frame_num;
 150     pp->log2_max_frame_num_minus4     = sps->log2_max_frame_num - 4;
 151     pp->pic_order_cnt_type            = sps->poc_type;
 152     if (sps->poc_type == 0)
 153         pp->log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
 154     else if (sps->poc_type == 1)
 155         pp->delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
 156     pp->direct_8x8_inference_flag     = sps->direct_8x8_inference_flag;
 157     pp->entropy_coding_mode_flag      = pps->cabac;
 158     pp->pic_order_present_flag        = pps->pic_order_present;
 159     pp->num_slice_groups_minus1       = pps->slice_group_count - 1;
 160     pp->slice_group_map_type          = pps->mb_slice_group_map_type;
 161     pp->deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
 162     pp->redundant_pic_cnt_present_flag= pps->redundant_pic_cnt_present;
 163     pp->Reserved8BitsB                = 0;
 164     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
 165     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
 166 }
 167
 168 static void fill_scaling_lists(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
 169 {
 170     const PPS *pps = h->ps.pps;
 171     unsigned i, j;
 172     memset(qm, 0, sizeof(*qm));
 173     if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
 174         for (i = 0; i < 6; i++)
 175             for (j = 0; j < 16; j++)
 176                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][j];
 177
 178         for (i = 0; i < 64; i++) {
 179             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][i];
 180             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][i];
 181         }
 182     } else {
 183         for (i = 0; i < 6; i++)
 184             for (j = 0; j < 16; j++)
 185                 qm->bScalingLists4x4[i][j] = pps->scaling_matrix4[i][ff_zigzag_scan[j]];
 186
 187         for (i = 0; i < 64; i++) {
 188             qm->bScalingLists8x8[0][i] = pps->scaling_matrix8[0][ff_zigzag_direct[i]];
 189             qm->bScalingLists8x8[1][i] = pps->scaling_matrix8[3][ff_zigzag_direct[i]];
 190         }
 191     }
 192 }
 193
 194 static int is_slice_short(const AVCodecContext *avctx, AVDXVAContext *ctx)
 195 {
 196     assert(DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 1 ||
 197            DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2);
 198     return DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2;
 199 }
 200
 201 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 202                              unsigned position, unsigned size)
 203 {
 204     memset(slice, 0, sizeof(*slice));
 205     slice->BSNALunitDataLocation = position;
 206     slice->SliceBytesInBuffer    = size;
 207     slice->wBadSliceChopping     = 0;
 208 }
 209
 210 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
 211 {
 212     int i;
 213     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
 214         if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
 215           return i;
 216     }
 217     return 0x7f;
 218 }
 219
 220 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 221                             const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
 222 {
 223     const H264Context *h = avctx->priv_data;
 224     H264SliceContext *sl = &h->slice_ctx[0];
 225     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);
 226     unsigned list;
 227
 228     memset(slice, 0, sizeof(*slice));
 229     slice->BSNALunitDataLocation = position;
 230     slice->SliceBytesInBuffer    = size;
 231     slice->wBadSliceChopping     = 0;
 232
 233     slice->first_mb_in_slice     = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
 234     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 235     slice->BitOffsetToSliceData  = get_bits_count(&sl->gb) - 8;
 236     slice->slice_type            = ff_h264_get_slice_type(sl);
 237     if (sl->slice_type_fixed)
 238         slice->slice_type += 5;
 239     slice->luma_log2_weight_denom       = sl->pwt.luma_log2_weight_denom;
 240     slice->chroma_log2_weight_denom     = sl->pwt.chroma_log2_weight_denom;
 241     if (sl->list_count > 0)
 242         slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
 243     if (sl->list_count > 1)
 244         slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;
 245     slice->slice_alpha_c0_offset_div2   = sl->slice_alpha_c0_offset / 2;
 246     slice->slice_beta_offset_div2       = sl->slice_beta_offset     / 2;
 247     slice->Reserved8Bits                = 0;
 248
 249     for (list = 0; list < 2; list++) {
 250         unsigned i;
 251         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 252             if (list < sl->list_count && i < sl->ref_count[list]) {
 253                 const H264Picture *r = sl->ref_list[list][i].parent;
 254                 unsigned plane;
 255                 unsigned index;
 256                 if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 257                     index = ff_dxva2_get_surface_index(avctx, ctx, r->f);
 258                 else
 259                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, r->f));
 260                 fill_picture_entry(&slice->RefPicList[list][i], index,
 261                                    sl->ref_list[list][i].reference == PICT_BOTTOM_FIELD);
 262                 for (plane = 0; plane < 3; plane++) {
 263                     int w, o;
 264                     if (plane == 0 && sl->pwt.luma_weight_flag[list]) {
 265                         w = sl->pwt.luma_weight[i][list][0];
 266                         o = sl->pwt.luma_weight[i][list][1];
 267                     } else if (plane >= 1 && sl->pwt.chroma_weight_flag[list]) {
 268                         w = sl->pwt.chroma_weight[i][list][plane-1][0];
 269                         o = sl->pwt.chroma_weight[i][list][plane-1][1];
 270                     } else {
 271                         w = 1 << (plane == 0 ? sl->pwt.luma_log2_weight_denom :
 272                                                sl->pwt.chroma_log2_weight_denom);
 273                         o = 0;
 274                     }
 275                     slice->Weights[list][i][plane][0] = w;
 276                     slice->Weights[list][i][plane][1] = o;
 277                 }
 278             } else {
 279                 unsigned plane;
 280                 slice->RefPicList[list][i].bPicEntry = 0xff;
 281                 for (plane = 0; plane < 3; plane++) {
 282                     slice->Weights[list][i][plane][0] = 0;
 283                     slice->Weights[list][i][plane][1] = 0;
 284                 }
 285             }
 286         }
 287     }
 288     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 289     slice->slice_qp_delta    = sl->qscale - h->ps.pps->init_qp;
 290     slice->redundant_pic_cnt = sl->redundant_pic_count;
 291     if (sl->slice_type == AV_PICTURE_TYPE_B)
 292         slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;
 293     slice->cabac_init_idc = h->ps.pps->cabac ? sl->cabac_init_idc : 0;
 294     if (sl->deblocking_filter < 2)
 295         slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;
 296     else
 297         slice->disable_deblocking_filter_idc = sl->deblocking_filter;
 298     slice->slice_id = h->current_slice - 1;
 299 }
 300
 301 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 302                                              DECODER_BUFFER_DESC *bs,
 303                                              DECODER_BUFFER_DESC *sc)
 304 {
 305     const H264Context *h = avctx->priv_data;
 306     const unsigned mb_count = h->mb_width * h->mb_height;
 307     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);
 308     const H264Picture *current_picture = h->cur_pic_ptr;
 309     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 310     DXVA_Slice_H264_Short *slice = NULL;
 311     void     *dxva_data_ptr = NULL;
 312     uint8_t  *dxva_data, *current, *end;
 313     unsigned dxva_size = 0;
 314     void     *slice_data;
 315     unsigned slice_size;
 316     unsigned padding;
 317     unsigned i;
 318     unsigned type;
 319
 320     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 321 #if CONFIG_D3D11VA
 322     if (ff_dxva2_is_d3d11(avctx)) {
 323         type = D3D11_VIDEO_DECODER_BUFFER_BITSTREAM;
 324         if (FAILED(ID3D11VideoContext_GetDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context,
 325                                                        D3D11VA_CONTEXT(ctx)->decoder,
 326                                                        type,
 327                                                        &dxva_size, &dxva_data_ptr)))
 328             return -1;
 329     }
 330 #endif
 331 #if CONFIG_DXVA2
 332     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 333         type = DXVA2_BitStreamDateBufferType;
 334         if (FAILED(IDirectXVideoDecoder_GetBuffer(DXVA2_CONTEXT(ctx)->decoder,
 335                                                   type,
 336                                                   &dxva_data_ptr, &dxva_size)))
 337             return -1;
 338     }
 339 #endif
 340
 341     dxva_data = dxva_data_ptr;
 342     current = dxva_data;
 343     end = dxva_data + dxva_size;
 344
 345     for (i = 0; i < ctx_pic->slice_count; i++) {
 346         static const uint8_t start_code[] = { 0, 0, 1 };
 347         static const unsigned start_code_size = sizeof(start_code);
 348         unsigned position, size;
 349
 350         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 351                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 352         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 353                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 354
 355         if (is_slice_short(avctx, ctx))
 356             slice = &ctx_pic->slice_short[i];
 357         else
 358             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 359
 360         position = slice->BSNALunitDataLocation;
 361         size     = slice->SliceBytesInBuffer;
 362         if (start_code_size + size > end - current) {
 363             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 364             break;
 365         }
 366
 367         slice->BSNALunitDataLocation = current - dxva_data;
 368         slice->SliceBytesInBuffer    = start_code_size + size;
 369
 370         if (!is_slice_short(avctx, ctx)) {
 371             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 372             if (i < ctx_pic->slice_count - 1)
 373                 slice_long->NumMbsForSlice =
 374                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 375             else
 376                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 377         }
 378
 379         memcpy(current, start_code, start_code_size);
 380         current += start_code_size;
 381
 382         memcpy(current, &ctx_pic->bitstream[position], size);
 383         current += size;
 384     }
 385     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 386     if (slice && padding > 0) {
 387         memset(current, 0, padding);
 388         current += padding;
 389
 390         slice->SliceBytesInBuffer += padding;
 391     }
 392 #if CONFIG_D3D11VA
 393     if (ff_dxva2_is_d3d11(avctx))
 394         if (FAILED(ID3D11VideoContext_ReleaseDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context, D3D11VA_CONTEXT(ctx)->decoder, type)))
 395             return -1;
 396 #endif
 397 #if CONFIG_DXVA2
 398     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD)
 399         if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(DXVA2_CONTEXT(ctx)->decoder, type)))
 400             return -1;
 401 #endif
 402     if (i < ctx_pic->slice_count)
 403         return -1;
 404
 405 #if CONFIG_D3D11VA
 406     if (ff_dxva2_is_d3d11(avctx)) {
 407         D3D11_VIDEO_DECODER_BUFFER_DESC *dsc11 = bs;
 408         memset(dsc11, 0, sizeof(*dsc11));
 409         dsc11->BufferType           = type;
 410         dsc11->DataSize             = current - dxva_data;
 411         dsc11->NumMBsInBuffer       = mb_count;
 412
 413         type = D3D11_VIDEO_DECODER_BUFFER_SLICE_CONTROL;
 414
 415         av_assert0((dsc11->DataSize & 127) == 0);
 416     }
 417 #endif
 418 #if CONFIG_DXVA2
 419     if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
 420         DXVA2_DecodeBufferDesc *dsc2 = bs;
 421         memset(dsc2, 0, sizeof(*dsc2));
 422         dsc2->CompressedBufferType = type;
 423         dsc2->DataSize             = current - dxva_data;
 424         dsc2->NumMBsInBuffer       = mb_count;
 425
 426         type = DXVA2_SliceControlBufferType;
 427
 428         av_assert0((dsc2->DataSize & 127) == 0);
 429     }
 430 #endif
 431
 432     if (is_slice_short(avctx, ctx)) {
 433         slice_data = ctx_pic->slice_short;
 434         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 435     } else {
 436         slice_data = ctx_pic->slice_long;
 437         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 438     }
 439     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 440                                   type,
 441                                   slice_data, slice_size, mb_count);
 442 }
 443
 444
 445 static int dxva2_h264_start_frame(AVCodecContext *avctx,
 446                                   av_unused const uint8_t *buffer,
 447                                   av_unused uint32_t size)
 448 {
 449     const H264Context *h = avctx->priv_data;
 450     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);
 451     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
 452
 453     if (!DXVA_CONTEXT_VALID(avctx, ctx))
 454         return -1;
 455     assert(ctx_pic);
 456
 457     /* Fill up DXVA_PicParams_H264 */
 458     fill_picture_parameters(avctx, ctx, h, &ctx_pic->pp);
 459
 460     /* Fill up DXVA_Qmatrix_H264 */
 461     fill_scaling_lists(avctx, ctx, h, &ctx_pic->qm);
 462
 463     ctx_pic->slice_count    = 0;
 464     ctx_pic->bitstream_size = 0;
 465     ctx_pic->bitstream      = NULL;
 466     return 0;
 467 }
 468
 469 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
 470                                    const uint8_t *buffer,
 471                                    uint32_t size)
 472 {
 473     const H264Context *h = avctx->priv_data;
 474     const H264SliceContext *sl = &h->slice_ctx[0];
 475     AVDXVAContext *ctx = DXVA_CONTEXT(avctx);
 476     const H264Picture *current_picture = h->cur_pic_ptr;
 477     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 478     unsigned position;
 479
 480     if (ctx_pic->slice_count >= MAX_SLICES)
 481         return -1;
 482
 483     if (!ctx_pic->bitstream)
 484         ctx_pic->bitstream = buffer;
 485     ctx_pic->bitstream_size += size;
 486
 487     position = buffer - ctx_pic->bitstream;
 488     if (is_slice_short(avctx, ctx))
 489         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 490                          position, size);
 491     else
 492         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 493                         &ctx_pic->pp, position, size);
 494     ctx_pic->slice_count++;
 495
 496     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
 497         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 498     return 0;
 499 }
 500
 501 static int dxva2_h264_end_frame(AVCodecContext *avctx)
 502 {
 503     H264Context *h = avctx->priv_data;
 504     H264SliceContext *sl = &h->slice_ctx[0];
 505     struct dxva2_picture_context *ctx_pic =
 506         h->cur_pic_ptr->hwaccel_picture_private;
 507     int ret;
 508
 509     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 510         return -1;
 511     ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr->f,
 512                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 513                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 514                                     commit_bitstream_and_slice_buffer);
 515     if (!ret)
 516         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
 517     return ret;
 518 }
 519
 520 #if CONFIG_H264_DXVA2_HWACCEL
 521 const AVHWAccel ff_h264_dxva2_hwaccel = {
 522     .name           = "h264_dxva2",
 523     .type           = AVMEDIA_TYPE_VIDEO,
 524     .id             = AV_CODEC_ID_H264,
 525     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 526     .init           = ff_dxva2_decode_init,
 527     .uninit         = ff_dxva2_decode_uninit,
 528     .start_frame    = dxva2_h264_start_frame,
 529     .decode_slice   = dxva2_h264_decode_slice,
 530     .end_frame      = dxva2_h264_end_frame,
 531     .frame_params   = ff_dxva2_common_frame_params,
 532     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 533     .priv_data_size = sizeof(FFDXVASharedContext),
 534 };
 535 #endif
 536
 537 #if CONFIG_H264_D3D11VA_HWACCEL
 538 const AVHWAccel ff_h264_d3d11va_hwaccel = {
 539     .name           = "h264_d3d11va",
 540     .type           = AVMEDIA_TYPE_VIDEO,
 541     .id             = AV_CODEC_ID_H264,
 542     .pix_fmt        = AV_PIX_FMT_D3D11VA_VLD,
 543     .init           = ff_dxva2_decode_init,
 544     .uninit         = ff_dxva2_decode_uninit,
 545     .start_frame    = dxva2_h264_start_frame,
 546     .decode_slice   = dxva2_h264_decode_slice,
 547     .end_frame      = dxva2_h264_end_frame,
 548     .frame_params   = ff_dxva2_common_frame_params,
 549     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 550     .priv_data_size = sizeof(FFDXVASharedContext),
 551 };
 552 #endif
 553
 554 #if CONFIG_H264_D3D11VA2_HWACCEL
 555 const AVHWAccel ff_h264_d3d11va2_hwaccel = {
 556     .name           = "h264_d3d11va2",
 557     .type           = AVMEDIA_TYPE_VIDEO,
 558     .id             = AV_CODEC_ID_H264,
 559     .pix_fmt        = AV_PIX_FMT_D3D11,
 560     .init           = ff_dxva2_decode_init,
 561     .uninit         = ff_dxva2_decode_uninit,
 562     .start_frame    = dxva2_h264_start_frame,
 563     .decode_slice   = dxva2_h264_decode_slice,
 564     .end_frame      = dxva2_h264_end_frame,
 565     .frame_params   = ff_dxva2_common_frame_params,
 566     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 567     .priv_data_size = sizeof(FFDXVASharedContext),
 568 };
 569 #endif