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

   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     struct dxva_context *ctx = avctx->hwaccel_context;
 215     unsigned list;
 216
 217     memset(slice, 0, sizeof(*slice));
 218     slice->BSNALunitDataLocation = position;
 219     slice->SliceBytesInBuffer    = size;
 220     slice->wBadSliceChopping     = 0;
 221
 222     slice->first_mb_in_slice     = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
 223     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 224     slice->BitOffsetToSliceData  = get_bits_count(&h->gb);
 225     slice->slice_type            = ff_h264_get_slice_type(h);
 226     if (h->slice_type_fixed)
 227         slice->slice_type += 5;
 228     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
 229     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
 230     if (h->list_count > 0)
 231         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
 232     if (h->list_count > 1)
 233         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
 234     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2;
 235     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2;
 236     slice->Reserved8Bits                = 0;
 237
 238     for (list = 0; list < 2; list++) {
 239         unsigned i;
 240         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 241             if (list < h->list_count && i < h->ref_count[list]) {
 242                 const H264Picture *r = &h->ref_list[list][i];
 243                 unsigned plane;
 244                 unsigned index;
 245                 if (ctx->workaround & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
 246                     index = ff_dxva2_get_surface_index(ctx, &r->f);
 247                 else
 248                     index = get_refpic_index(pp, ff_dxva2_get_surface_index(ctx, &r->f));
 249                 fill_picture_entry(&slice->RefPicList[list][i], index,
 250                                    r->reference == PICT_BOTTOM_FIELD);
 251                 for (plane = 0; plane < 3; plane++) {
 252                     int w, o;
 253                     if (plane == 0 && h->luma_weight_flag[list]) {
 254                         w = h->luma_weight[i][list][0];
 255                         o = h->luma_weight[i][list][1];
 256                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
 257                         w = h->chroma_weight[i][list][plane-1][0];
 258                         o = h->chroma_weight[i][list][plane-1][1];
 259                     } else {
 260                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
 261                                                h->chroma_log2_weight_denom);
 262                         o = 0;
 263                     }
 264                     slice->Weights[list][i][plane][0] = w;
 265                     slice->Weights[list][i][plane][1] = o;
 266                 }
 267             } else {
 268                 unsigned plane;
 269                 slice->RefPicList[list][i].bPicEntry = 0xff;
 270                 for (plane = 0; plane < 3; plane++) {
 271                     slice->Weights[list][i][plane][0] = 0;
 272                     slice->Weights[list][i][plane][1] = 0;
 273                 }
 274             }
 275         }
 276     }
 277     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 278     slice->slice_qp_delta    = h->qscale - h->pps.init_qp;
 279     slice->redundant_pic_cnt = h->redundant_pic_count;
 280     if (h->slice_type == AV_PICTURE_TYPE_B)
 281         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
 282     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
 283     if (h->deblocking_filter < 2)
 284         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
 285     else
 286         slice->disable_deblocking_filter_idc = h->deblocking_filter;
 287     slice->slice_id = h->current_slice - 1;
 288 }
 289
 290 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 291                                              DXVA2_DecodeBufferDesc *bs,
 292                                              DXVA2_DecodeBufferDesc *sc)
 293 {
 294     const H264Context *h = avctx->priv_data;
 295     const unsigned mb_count = h->mb_width * h->mb_height;
 296     struct dxva_context *ctx = avctx->hwaccel_context;
 297     const H264Picture *current_picture = h->cur_pic_ptr;
 298     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 299     DXVA_Slice_H264_Short *slice = NULL;
 300     void     *dxva_data_ptr;
 301     uint8_t  *dxva_data, *current, *end;
 302     unsigned dxva_size;
 303     void     *slice_data;
 304     unsigned slice_size;
 305     unsigned padding;
 306     unsigned i;
 307
 308     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 309     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 310                                               DXVA2_BitStreamDateBufferType,
 311                                               &dxva_data_ptr, &dxva_size)))
 312         return -1;
 313
 314     dxva_data = dxva_data_ptr;
 315     current = dxva_data;
 316     end = dxva_data + dxva_size;
 317
 318     for (i = 0; i < ctx_pic->slice_count; i++) {
 319         static const uint8_t start_code[] = { 0, 0, 1 };
 320         static const unsigned start_code_size = sizeof(start_code);
 321         unsigned position, size;
 322
 323         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 324                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 325         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 326                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 327
 328         if (is_slice_short(ctx))
 329             slice = &ctx_pic->slice_short[i];
 330         else
 331             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 332
 333         position = slice->BSNALunitDataLocation;
 334         size     = slice->SliceBytesInBuffer;
 335         if (start_code_size + size > end - current) {
 336             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 337             break;
 338         }
 339
 340         slice->BSNALunitDataLocation = current - dxva_data;
 341         slice->SliceBytesInBuffer    = start_code_size + size;
 342
 343         if (!is_slice_short(ctx)) {
 344             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 345             if (i < ctx_pic->slice_count - 1)
 346                 slice_long->NumMbsForSlice =
 347                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 348             else
 349                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 350         }
 351
 352         memcpy(current, start_code, start_code_size);
 353         current += start_code_size;
 354
 355         memcpy(current, &ctx_pic->bitstream[position], size);
 356         current += size;
 357     }
 358     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 359     if (slice && padding > 0) {
 360         memset(current, 0, padding);
 361         current += padding;
 362
 363         slice->SliceBytesInBuffer += padding;
 364     }
 365     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 366                                                   DXVA2_BitStreamDateBufferType)))
 367         return -1;
 368     if (i < ctx_pic->slice_count)
 369         return -1;
 370
 371     memset(bs, 0, sizeof(*bs));
 372     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 373     bs->DataSize             = current - dxva_data;
 374     bs->NumMBsInBuffer       = mb_count;
 375
 376     if (is_slice_short(ctx)) {
 377         slice_data = ctx_pic->slice_short;
 378         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 379     } else {
 380         slice_data = ctx_pic->slice_long;
 381         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 382     }
 383     assert((bs->DataSize & 127) == 0);
 384     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 385                                   DXVA2_SliceControlBufferType,
 386                                   slice_data, slice_size, mb_count);
 387 }
 388
 389
 390 static int dxva2_h264_start_frame(AVCodecContext *avctx,
 391                                   av_unused const uint8_t *buffer,
 392                                   av_unused uint32_t size)
 393 {
 394     const H264Context *h = avctx->priv_data;
 395     struct dxva_context *ctx = avctx->hwaccel_context;
 396     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
 397
 398     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 399         return -1;
 400     assert(ctx_pic);
 401
 402     /* Fill up DXVA_PicParams_H264 */
 403     fill_picture_parameters(ctx, h, &ctx_pic->pp);
 404
 405     /* Fill up DXVA_Qmatrix_H264 */
 406     fill_scaling_lists(ctx, h, &ctx_pic->qm);
 407
 408     ctx_pic->slice_count    = 0;
 409     ctx_pic->bitstream_size = 0;
 410     ctx_pic->bitstream      = NULL;
 411     return 0;
 412 }
 413
 414 static int dxva2_h264_decode_slice(AVCodecContext *avctx,
 415                                    const uint8_t *buffer,
 416                                    uint32_t size)
 417 {
 418     const H264Context *h = avctx->priv_data;
 419     struct dxva_context *ctx = avctx->hwaccel_context;
 420     const H264Picture *current_picture = h->cur_pic_ptr;
 421     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 422     unsigned position;
 423
 424     if (ctx_pic->slice_count >= MAX_SLICES)
 425         return -1;
 426
 427     if (!ctx_pic->bitstream)
 428         ctx_pic->bitstream = buffer;
 429     ctx_pic->bitstream_size += size;
 430
 431     position = buffer - ctx_pic->bitstream;
 432     if (is_slice_short(ctx))
 433         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 434                          position, size);
 435     else
 436         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 437                         &ctx_pic->pp, position, size);
 438     ctx_pic->slice_count++;
 439
 440     if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
 441         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 442     return 0;
 443 }
 444
 445 static int dxva2_h264_end_frame(AVCodecContext *avctx)
 446 {
 447     H264Context *h = avctx->priv_data;
 448     struct dxva2_picture_context *ctx_pic =
 449         h->cur_pic_ptr->hwaccel_picture_private;
 450     int ret;
 451
 452     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 453         return -1;
 454     ret = ff_dxva2_common_end_frame(avctx, &h->cur_pic_ptr->f,
 455                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 456                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 457                                     commit_bitstream_and_slice_buffer);
 458     if (!ret)
 459         ff_h264_draw_horiz_band(h, 0, h->avctx->height);
 460     return ret;
 461 }
 462
 463 AVHWAccel ff_h264_dxva2_hwaccel = {
 464     .name           = "h264_dxva2",
 465     .type           = AVMEDIA_TYPE_VIDEO,
 466     .id             = AV_CODEC_ID_H264,
 467     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 468     .start_frame    = dxva2_h264_start_frame,
 469     .decode_slice   = dxva2_h264_decode_slice,
 470     .end_frame      = dxva2_h264_end_frame,
 471     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 472 };