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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 "dxva2_internal.h"
  24 #include "h264.h"
  25 #include "h264data.h"
  26 #include "mpegutils.h"
  27
  28 struct dxva2_picture_context {
  29     DXVA_PicParams_H264   pp;
  30     DXVA_Qmatrix_H264     qm;
  31     unsigned              slice_count;
  32     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
  33     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
  34     const uint8_t         *bitstream;
  35     unsigned              bitstream_size;
  36 };
  37
  38 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
  39                                unsigned index, unsigned flag)
  40 {
  41     assert((index&0x7f) == index && (flag&0x01) == flag);
  42     pic->bPicEntry = index | (flag << 7);
  43 }
  44
  45 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
  46                                     DXVA_PicParams_H264 *pp)
  47 {
  48     const H264Picture *current_picture = h->cur_pic_ptr;
  49     int i, j;
  50
  51     memset(pp, 0, sizeof(*pp));
  52     /* Configure current picture */
  53     fill_picture_entry(&pp->CurrPic,
  54                        ff_dxva2_get_surface_index(ctx, &current_picture->f),
  55                        h->picture_structure == PICT_BOTTOM_FIELD);
  56     /* Configure the set of references */
  57     pp->UsedForReferenceFlags  = 0;
  58     pp->NonExistingFrameFlags  = 0;
  59     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  60         const H264Picture *r;
  61         if (j < h->short_ref_count) {
  62             r = h->short_ref[j++];
  63         } else {
  64             r = NULL;
  65             while (!r && j < h->short_ref_count + 16)
  66                 r = h->long_ref[j++ - h->short_ref_count];
  67         }
  68         if (r) {
  69             fill_picture_entry(&pp->RefFrameList[i],
  70                                ff_dxva2_get_surface_index(ctx, &r->f),
  71                                r->long_ref != 0);
  72
  73             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  74                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  75             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
  76                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
  77
  78             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
  79             if (r->reference & PICT_TOP_FIELD)
  80                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  81             if (r->reference & PICT_BOTTOM_FIELD)
  82                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
  83         } else {
  84             pp->RefFrameList[i].bPicEntry = 0xff;
  85             pp->FieldOrderCntList[i][0]   = 0;
  86             pp->FieldOrderCntList[i][1]   = 0;
  87             pp->FrameNumList[i]           = 0;
  88         }
  89     }
  90
  91     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
  92     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;
  93     pp->num_ref_frames                = h->sps.ref_frame_count;
  94
  95     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |
  96                                         ((h->sps.mb_aff &&
  97                                         (h->picture_structure == PICT_FRAME)) <<  1) |
  98                                         (h->sps.residual_color_transform_flag <<  2) |
  99                                         /* sp_for_switch_flag (not implemented by FFmpeg) */
 100                                         (0                                    <<  3) |
 101                                         (h->sps.chroma_format_idc             <<  4) |
 102                                         ((h->nal_ref_idc != 0)                <<  6) |
 103                                         (h->pps.constrained_intra_pred        <<  7) |
 104                                         (h->pps.weighted_pred                 <<  8) |
 105                                         (h->pps.weighted_bipred_idc           <<  9) |
 106                                         /* MbsConsecutiveFlag */
 107                                         (1                                    << 11) |
 108                                         (h->sps.frame_mbs_only_flag           << 12) |
 109                                         (h->pps.transform_8x8_mode            << 13) |
 110                                         ((h->sps.level_idc >= 31)             << 14) |
 111                                         /* IntraPicFlag (Modified if we detect a non
 112                                          * intra slice in dxva2_h264_decode_slice) */
 113                                         (1                                    << 15);
 114
 115     pp->bit_depth_luma_minus8         = h->sps.bit_depth_luma - 8;
 116     pp->bit_depth_chroma_minus8       = h->sps.bit_depth_chroma - 8;
 117     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
 118         pp->Reserved16Bits            = 0;
 119     else if (ctx->workaround & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 120         pp->Reserved16Bits            = 0x34c;
 121     else
 122         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
 123     pp->StatusReportFeedbackNumber    = 1 + ctx->report_id++;
 124     pp->CurrFieldOrderCnt[0] = 0;
 125     if ((h->picture_structure & PICT_TOP_FIELD) &&
 126         current_picture->field_poc[0] != INT_MAX)
 127         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 128     pp->CurrFieldOrderCnt[1] = 0;
 129     if ((h->picture_structure & PICT_BOTTOM_FIELD) &&
 130         current_picture->field_poc[1] != INT_MAX)
 131         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 132     pp->pic_init_qs_minus26           = h->pps.init_qs - 26;
 133     pp->chroma_qp_index_offset        = h->pps.chroma_qp_index_offset[0];
 134     pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
 135     pp->ContinuationFlag              = 1;
 136     pp->pic_init_qp_minus26           = h->pps.init_qp - 26;
 137     pp->num_ref_idx_l0_active_minus1  = h->pps.ref_count[0] - 1;
 138     pp->num_ref_idx_l1_active_minus1  = h->pps.ref_count[1] - 1;
 139     pp->Reserved8BitsA                = 0;
 140     pp->frame_num                     = h->frame_num;
 141     pp->log2_max_frame_num_minus4     = h->sps.log2_max_frame_num - 4;
 142     pp->pic_order_cnt_type            = h->sps.poc_type;
 143     if (h->sps.poc_type == 0)
 144         pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
 145     else if (h->sps.poc_type == 1)
 146         pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
 147     pp->direct_8x8_inference_flag     = h->sps.direct_8x8_inference_flag;
 148     pp->entropy_coding_mode_flag      = h->pps.cabac;
 149     pp->pic_order_present_flag        = h->pps.pic_order_present;
 150     pp->num_slice_groups_minus1       = h->pps.slice_group_count - 1;
 151     pp->slice_group_map_type          = h->pps.mb_slice_group_map_type;
 152     pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
 153     pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
 154     pp->Reserved8BitsB                = 0;
 155     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
 156     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
 157 }
 158
 159 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
 160 {
 161     unsigned i, j;
 162     memset(qm, 0, sizeof(*qm));
 163     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
 164         for (i = 0; i < 6; i++)
 165             for (j = 0; j < 16; j++)
 166                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
 167
 168         for (i = 0; i < 64; i++) {
 169             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
 170             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
 171         }
 172     } else {
 173         for (i = 0; i < 6; i++)
 174             for (j = 0; j < 16; j++)
 175                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
 176
 177         for (i = 0; i < 64; i++) {
 178             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
 179             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
 180         }
 181     }
 182 }
 183
 184 static int is_slice_short(struct dxva_context *ctx)
 185 {
 186     assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
 187            ctx->cfg->ConfigBitstreamRaw == 2);
 188     return ctx->cfg->ConfigBitstreamRaw == 2;
 189 }
 190
 191 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 192                              unsigned position, unsigned size)
 193 {
 194     memset(slice, 0, sizeof(*slice));
 195     slice->BSNALunitDataLocation = position;
 196     slice->SliceBytesInBuffer    = size;
 197     slice->wBadSliceChopping     = 0;
 198 }
 199
 200 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
 201 {
 202     int i;
 203     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
 204         if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
 205           return i;
 206     }
 207     return 0x7f;
 208 }
 209
 210 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 211                             const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
 212 {
 213     const H264Context *h = avctx->priv_data;
 214     H264SliceContext *sl = &h->slice_ctx[0];
 215     struct dxva_context *ctx = avctx->hwaccel_context;
 216     unsigned list;
 217
 218     memset(slice, 0, sizeof(*slice));
 219     slice->BSNALunitDataLocation = position;
 220     slice->SliceBytesInBuffer    = size;
 221     slice->wBadSliceChopping     = 0;
 222
 223     slice->first_mb_in_slice     = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
 224     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 225     slice->BitOffsetToSliceData  = get_bits_count(&h->gb);
 226     slice->slice_type            = ff_h264_get_slice_type(sl);
 227     if (sl->slice_type_fixed)
 228         slice->slice_type += 5;
 229     slice->luma_log2_weight_denom       = sl->luma_log2_weight_denom;
 230     slice->chroma_log2_weight_denom     = sl->chroma_log2_weight_denom;
 231     if (sl->list_count > 0)
 232         slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
 233     if (sl->list_count > 1)
 234         slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;
 235     slice->slice_alpha_c0_offset_div2   = sl->slice_alpha_c0_offset / 2;
 236     slice->slice_beta_offset_div2       = sl->slice_beta_offset     / 2;
 237     slice->Reserved8Bits                = 0;
 238
 239     for (list = 0; list < 2; list++) {
 240         unsigned i;
 241         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 242             if (list < sl->list_count && i < sl->ref_count[list]) {
 243                 const H264Picture *r = &sl->ref_list[list][i];
 244                 unsigned plane;
 245                 unsigned index;
 246                 if (ctx->workaround & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 247                     index = ff_dxva2_get_surface_index(ctx, &r->f);
 248                 else
 249                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(ctx, &r->f));
 250                 fill_picture_entry(&slice->RefPicList[list][i], index,
 251                                    r->reference == PICT_BOTTOM_FIELD);
 252                 for (plane = 0; plane < 3; plane++) {
 253                     int w, o;
 254                     if (plane == 0 && sl->luma_weight_flag[list]) {
 255                         w = sl->luma_weight[i][list][0];
 256                         o = sl->luma_weight[i][list][1];
 257                     } else if (plane >= 1 && sl->chroma_weight_flag[list]) {
 258                         w = sl->chroma_weight[i][list][plane-1][0];
 259                         o = sl->chroma_weight[i][list][plane-1][1];
 260                     } else {
 261                         w = 1 << (plane == 0 ? sl->luma_log2_weight_denom :
 262                                                sl->chroma_log2_weight_denom);
 263                         o = 0;
 264                     }
 265                     slice->Weights[list][i][plane][0] = w;
 266                     slice->Weights[list][i][plane][1] = o;
 267                 }
 268             } else {
 269                 unsigned plane;
 270                 slice->RefPicList[list][i].bPicEntry = 0xff;
 271                 for (plane = 0; plane < 3; plane++) {
 272                     slice->Weights[list][i][plane][0] = 0;
 273                     slice->Weights[list][i][plane][1] = 0;
 274                 }
 275             }
 276         }
 277     }
 278     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 279     slice->slice_qp_delta    = sl->qscale - h->pps.init_qp;
 280     slice->redundant_pic_cnt = h->redundant_pic_count;
 281     if (sl->slice_type == AV_PICTURE_TYPE_B)
 282         slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;
 283     slice->cabac_init_idc = h->pps.cabac ? sl->cabac_init_idc : 0;
 284     if (sl->deblocking_filter < 2)
 285         slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;
 286     else
 287         slice->disable_deblocking_filter_idc = sl->deblocking_filter;
 288     slice->slice_id = h->current_slice - 1;
 289 }
 290
 291 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 292                                              DXVA2_DecodeBufferDesc *bs,
 293                                              DXVA2_DecodeBufferDesc *sc)
 294 {
 295     const H264Context *h = avctx->priv_data;
 296     const unsigned mb_count = h->mb_width * h->mb_height;
 297     struct dxva_context *ctx = avctx->hwaccel_context;
 298     const H264Picture *current_picture = h->cur_pic_ptr;
 299     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 300     DXVA_Slice_H264_Short *slice = NULL;
 301     void     *dxva_data_ptr;
 302     uint8_t  *dxva_data, *current, *end;
 303     unsigned dxva_size;
 304     void     *slice_data;
 305     unsigned slice_size;
 306     unsigned padding;
 307     unsigned i;
 308
 309     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 310     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 311                                               DXVA2_BitStreamDateBufferType,
 312                                               &dxva_data_ptr, &dxva_size)))
 313         return -1;
 314
 315     dxva_data = dxva_data_ptr;
 316     current = dxva_data;
 317     end = dxva_data + dxva_size;
 318
 319     for (i = 0; i < ctx_pic->slice_count; i++) {
 320         static const uint8_t start_code[] = { 0, 0, 1 };
 321         static const unsigned start_code_size = sizeof(start_code);
 322         unsigned position, size;
 323
 324         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 325                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 326         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 327                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 328
 329         if (is_slice_short(ctx))
 330             slice = &ctx_pic->slice_short[i];
 331         else
 332             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 333
 334         position = slice->BSNALunitDataLocation;
 335         size     = slice->SliceBytesInBuffer;
 336         if (start_code_size + size > end - current) {
 337             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 338             break;
 339         }
 340
 341         slice->BSNALunitDataLocation = current - dxva_data;
 342         slice->SliceBytesInBuffer    = start_code_size + size;
 343
 344         if (!is_slice_short(ctx)) {
 345             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 346             if (i < ctx_pic->slice_count - 1)
 347                 slice_long->NumMbsForSlice =
 348                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 349             else
 350                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 351         }
 352
 353         memcpy(current, start_code, start_code_size);
 354         current += start_code_size;
 355
 356         memcpy(current, &ctx_pic->bitstream[position], size);
 357         current += size;
 358     }
 359     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 360     if (slice && padding > 0) {
 361         memset(current, 0, padding);
 362         current += padding;
 363
 364         slice->SliceBytesInBuffer += padding;
 365     }
 366     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 367                                                   DXVA2_BitStreamDateBufferType)))
 368         return -1;
 369     if (i < ctx_pic->slice_count)
 370         return -1;
 371
 372     memset(bs, 0, sizeof(*bs));
 373     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 374     bs->DataSize             = current - dxva_data;
 375     bs->NumMBsInBuffer       = mb_count;
 376
 377     if (is_slice_short(ctx)) {
 378         slice_data = ctx_pic->slice_short;
 379         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 380     } else {
 381         slice_data = ctx_pic->slice_long;
 382         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 383     }
 384     assert((bs->DataSize & 127) == 0);
 385     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 386                                   DXVA2_SliceControlBufferType,
 387                                   slice_data, slice_size, mb_count);
 388 }
 389
 390
 391 static int dxva2_h264_start_frame(AVCodecContext *avctx,
 392                                   av_unused const uint8_t *buffer,
 393                                   av_unused uint32_t size)
 394 {
 395     const H264Context *h = avctx->priv_data;
 396     struct dxva_context *ctx = avctx->hwaccel_context;
 397     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
 398
 399     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 400         return -1;
 401     assert(ctx_pic);
 402
 403     /* Fill up DXVA_PicParams_H264 */
 404     fill_picture_parameters(ctx, h, &ctx_pic->pp);
 405
 406     /* Fill up DXVA_Qmatrix_H264 */
 407     fill_scaling_lists(ctx, h, &ctx_pic->qm);
 408
 409     ctx_pic->slice_count    = 0;
 410     ctx_pic->bitstream_size = 0;
 411     ctx_pic->bitstream      = NULL;
 412     return 0;
 413 }
 414
 415 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
 416                                    const uint8_t *buffer,
 417                                    uint32_t size)
 418 {
 419     const H264Context *h = avctx->priv_data;
 420     const H264SliceContext *sl = &h->slice_ctx[0];
 421     struct dxva_context *ctx = avctx->hwaccel_context;
 422     const H264Picture *current_picture = h->cur_pic_ptr;
 423     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 424     unsigned position;
 425
 426     if (ctx_pic->slice_count >= MAX_SLICES)
 427         return -1;
 428
 429     if (!ctx_pic->bitstream)
 430         ctx_pic->bitstream = buffer;
 431     ctx_pic->bitstream_size += size;
 432
 433     position = buffer - ctx_pic->bitstream;
 434     if (is_slice_short(ctx))
 435         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 436                          position, size);
 437     else
 438         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 439                         &ctx_pic->pp, position, size);
 440     ctx_pic->slice_count++;
 441
 442     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
 443         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 444     return 0;
 445 }
 446
 447 static int dxva2_h264_end_frame(AVCodecContext *avctx)
 448 {
 449     H264Context *h = avctx->priv_data;
 450     H264SliceContext *sl = &h->slice_ctx[0];
 451     struct dxva2_picture_context *ctx_pic =
 452         h->cur_pic_ptr->hwaccel_picture_private;
 453     int ret;
 454
 455     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 456         return -1;
 457     ret = ff_dxva2_common_end_frame(avctx, &h->cur_pic_ptr->f,
 458                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 459                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 460                                     commit_bitstream_and_slice_buffer);
 461     if (!ret)
 462         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
 463     return ret;
 464 }
 465
 466 AVHWAccel ff_h264_dxva2_hwaccel = {
 467     .name           = "h264_dxva2",
 468     .type           = AVMEDIA_TYPE_VIDEO,
 469     .id             = AV_CODEC_ID_H264,
 470     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 471     .start_frame    = dxva2_h264_start_frame,
 472     .decode_slice   = dxva2_h264_decode_slice,
 473     .end_frame      = dxva2_h264_end_frame,
 474     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 475 };