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   1 /*
   2  * DXVA2 HEVC HW acceleration.
   3  *
   4  * copyright (c) 2014 - 2015 Hendrik Leppkes
   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 "dxva2_internal.h"
  26 #include "hevc.h"
  27
  28 #define MAX_SLICES 256
  29
  30 struct hevc_dxva2_picture_context {
  31     DXVA_PicParams_HEVC   pp;
  32     DXVA_Qmatrix_HEVC     qm;
  33     unsigned              slice_count;
  34     DXVA_Slice_HEVC_Short slice_short[MAX_SLICES];
  35     const uint8_t         *bitstream;
  36     unsigned              bitstream_size;
  37 };
  38
  39 static void fill_picture_entry(DXVA_PicEntry_HEVC *pic,
  40                                unsigned index, unsigned flag)
  41 {
  42     av_assert0((index & 0x7f) == index && (flag & 0x01) == flag);
  43     pic->bPicEntry = index | (flag << 7);
  44 }
  45
  46 static int get_refpic_index(const DXVA_PicParams_HEVC *pp, int surface_index)
  47 {
  48     int i;
  49     for (i = 0; i < FF_ARRAY_ELEMS(pp->RefPicList); i++) {
  50         if ((pp->RefPicList[i].bPicEntry & 0x7f) == surface_index)
  51           return i;
  52     }
  53     return 0xff;
  54 }
  55
  56 static void fill_picture_parameters(struct dxva_context *ctx, const HEVCContext *h,
  57                                     DXVA_PicParams_HEVC *pp)
  58 {
  59     const HEVCFrame *current_picture = h->ref;
  60     int i, j, k;
  61
  62     memset(pp, 0, sizeof(*pp));
  63
  64     pp->PicWidthInMinCbsY  = h->sps->min_cb_width;
  65     pp->PicHeightInMinCbsY = h->sps->min_cb_height;
  66
  67     pp->wFormatAndSequenceInfoFlags = (h->sps->chroma_format_idc          <<  0) |
  68                                       (h->sps->separate_colour_plane_flag <<  2) |
  69                                       ((h->sps->bit_depth - 8)            <<  3) |
  70                                       ((h->sps->bit_depth - 8)            <<  6) |
  71                                       ((h->sps->log2_max_poc_lsb - 4)     <<  9) |
  72                                       (0                                  << 13) |
  73                                       (0                                  << 14) |
  74                                       (0                                  << 15);
  75
  76     fill_picture_entry(&pp->CurrPic, ff_dxva2_get_surface_index(ctx, current_picture->frame), 0);
  77
  78     pp->sps_max_dec_pic_buffering_minus1         = h->sps->temporal_layer[h->sps->max_sub_layers - 1].max_dec_pic_buffering - 1;
  79     pp->log2_min_luma_coding_block_size_minus3   = h->sps->log2_min_cb_size - 3;
  80     pp->log2_diff_max_min_luma_coding_block_size = h->sps->log2_diff_max_min_coding_block_size;
  81     pp->log2_min_transform_block_size_minus2     = h->sps->log2_min_tb_size - 2;
  82     pp->log2_diff_max_min_transform_block_size   = h->sps->log2_max_trafo_size  - h->sps->log2_min_tb_size;
  83     pp->max_transform_hierarchy_depth_inter      = h->sps->max_transform_hierarchy_depth_inter;
  84     pp->max_transform_hierarchy_depth_intra      = h->sps->max_transform_hierarchy_depth_intra;
  85     pp->num_short_term_ref_pic_sets              = h->sps->nb_st_rps;
  86     pp->num_long_term_ref_pics_sps               = h->sps->num_long_term_ref_pics_sps;
  87
  88     pp->num_ref_idx_l0_default_active_minus1     = h->pps->num_ref_idx_l0_default_active - 1;
  89     pp->num_ref_idx_l1_default_active_minus1     = h->pps->num_ref_idx_l1_default_active - 1;
  90     pp->init_qp_minus26                          = h->pps->pic_init_qp_minus26;
  91
  92     if (h->sh.short_term_ref_pic_set_sps_flag == 0 && h->sh.short_term_rps) {
  93         pp->ucNumDeltaPocsOfRefRpsIdx            = h->sh.short_term_rps->num_delta_pocs;
  94         pp->wNumBitsForShortTermRPSInSlice       = h->sh.short_term_ref_pic_set_size;
  95     }
  96
  97     pp->dwCodingParamToolFlags = (h->sps->scaling_list_enable_flag               <<  0) |
  98                                  (h->sps->amp_enabled_flag                       <<  1) |
  99                                  (h->sps->sao_enabled                            <<  2) |
 100                                  (h->sps->pcm_enabled_flag                       <<  3) |
 101                                  ((h->sps->pcm_enabled_flag ? (h->sps->pcm.bit_depth - 1) : 0)            <<  4) |
 102                                  ((h->sps->pcm_enabled_flag ? (h->sps->pcm.bit_depth_chroma - 1) : 0)     <<  8) |
 103                                  ((h->sps->pcm_enabled_flag ? (h->sps->pcm.log2_min_pcm_cb_size - 3) : 0) << 12) |
 104                                  ((h->sps->pcm_enabled_flag ? (h->sps->pcm.log2_max_pcm_cb_size - h->sps->pcm.log2_min_pcm_cb_size) : 0) << 14) |
 105                                  (h->sps->pcm.loop_filter_disable_flag           << 16) |
 106                                  (h->sps->long_term_ref_pics_present_flag        << 17) |
 107                                  (h->sps->sps_temporal_mvp_enabled_flag          << 18) |
 108                                  (h->sps->sps_strong_intra_smoothing_enable_flag << 19) |
 109                                  (h->pps->dependent_slice_segments_enabled_flag  << 20) |
 110                                  (h->pps->output_flag_present_flag               << 21) |
 111                                  (h->pps->num_extra_slice_header_bits            << 22) |
 112                                  (h->pps->sign_data_hiding_flag                  << 25) |
 113                                  (h->pps->cabac_init_present_flag                << 26) |
 114                                  (0                                              << 27);
 115
 116     pp->dwCodingSettingPicturePropertyFlags = (h->pps->constrained_intra_pred_flag                <<  0) |
 117                                               (h->pps->transform_skip_enabled_flag                <<  1) |
 118                                               (h->pps->cu_qp_delta_enabled_flag                   <<  2) |
 119                                               (h->pps->pic_slice_level_chroma_qp_offsets_present_flag <<  3) |
 120                                               (h->pps->weighted_pred_flag                         <<  4) |
 121                                               (h->pps->weighted_bipred_flag                       <<  5) |
 122                                               (h->pps->transquant_bypass_enable_flag              <<  6) |
 123                                               (h->pps->tiles_enabled_flag                         <<  7) |
 124                                               (h->pps->entropy_coding_sync_enabled_flag           <<  8) |
 125                                               (h->pps->uniform_spacing_flag                       <<  9) |
 126                                               ((h->pps->tiles_enabled_flag ? h->pps->loop_filter_across_tiles_enabled_flag : 0) << 10) |
 127                                               (h->pps->seq_loop_filter_across_slices_enabled_flag << 11) |
 128                                               (h->pps->deblocking_filter_override_enabled_flag    << 12) |
 129                                               (h->pps->disable_dbf                                << 13) |
 130                                               (h->pps->lists_modification_present_flag            << 14) |
 131                                               (h->pps->slice_header_extension_present_flag        << 15) |
 132                                               (IS_IRAP(h)                                         << 16) |
 133                                               (IS_IDR(h)                                          << 17) |
 134                                               /* IntraPicFlag */
 135                                               (IS_IRAP(h)                                         << 18) |
 136                                               (0                                                  << 19);
 137     pp->pps_cb_qp_offset            = h->pps->cb_qp_offset;
 138     pp->pps_cr_qp_offset            = h->pps->cr_qp_offset;
 139     if (h->pps->tiles_enabled_flag) {
 140         pp->num_tile_columns_minus1 = h->pps->num_tile_columns - 1;
 141         pp->num_tile_rows_minus1    = h->pps->num_tile_rows - 1;
 142
 143         if (!h->pps->uniform_spacing_flag) {
 144             for (i = 0; i < h->pps->num_tile_columns; i++)
 145                 pp->column_width_minus1[i] = h->pps->column_width[i] - 1;
 146
 147             for (i = 0; i < h->pps->num_tile_rows; i++)
 148                 pp->row_height_minus1[i] = h->pps->row_height[i] - 1;
 149         }
 150     }
 151
 152     pp->diff_cu_qp_delta_depth           = h->pps->diff_cu_qp_delta_depth;
 153     pp->pps_beta_offset_div2             = h->pps->beta_offset / 2;
 154     pp->pps_tc_offset_div2               = h->pps->tc_offset / 2;
 155     pp->log2_parallel_merge_level_minus2 = h->pps->log2_parallel_merge_level - 2;
 156     pp->CurrPicOrderCntVal               = h->poc;
 157
 158     // empty the lists
 159     memset(&pp->RefPicList, 0xff, sizeof(pp->RefPicList));
 160     memset(&pp->RefPicSetStCurrBefore, 0xff, sizeof(pp->RefPicSetStCurrBefore));
 161     memset(&pp->RefPicSetStCurrAfter, 0xff, sizeof(pp->RefPicSetStCurrAfter));
 162     memset(&pp->RefPicSetLtCurr, 0xff, sizeof(pp->RefPicSetLtCurr));
 163
 164     // fill RefPicList from the DPB
 165     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(h->DPB); i++) {
 166         const HEVCFrame *frame = &h->DPB[i];
 167         if (frame != current_picture && (frame->flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF))) {
 168             fill_picture_entry(&pp->RefPicList[j], ff_dxva2_get_surface_index(ctx, frame->frame), !!(frame->flags & HEVC_FRAME_FLAG_LONG_REF));
 169             pp->PicOrderCntValList[j] = frame->poc;
 170             j++;
 171         }
 172     }
 173
 174     #define DO_REF_LIST(ref_idx, ref_list) { \
 175         const RefPicList *rpl = &h->rps[ref_idx]; \
 176         av_assert0(rpl->nb_refs <= FF_ARRAY_ELEMS(pp->ref_list)); \
 177         for (j = 0, k = 0; j < rpl->nb_refs; j++) { \
 178             if (rpl->ref[j]) { \
 179                 pp->ref_list[k] = get_refpic_index(pp, ff_dxva2_get_surface_index(ctx, rpl->ref[j]->frame)); \
 180                 k++; \
 181             } \
 182         } \
 183     }
 184
 185     // Fill short term and long term lists
 186     DO_REF_LIST(ST_CURR_BEF, RefPicSetStCurrBefore);
 187     DO_REF_LIST(ST_CURR_AFT, RefPicSetStCurrAfter);
 188     DO_REF_LIST(LT_CURR, RefPicSetLtCurr);
 189
 190     pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
 191 }
 192
 193 static void fill_scaling_lists(struct dxva_context *ctx, const HEVCContext *h, DXVA_Qmatrix_HEVC *qm)
 194 {
 195     unsigned i, j, pos;
 196     const ScalingList *sl = h->pps->scaling_list_data_present_flag ?
 197                             &h->pps->scaling_list : &h->sps->scaling_list;
 198
 199     memset(qm, 0, sizeof(*qm));
 200     for (i = 0; i < 6; i++) {
 201         for (j = 0; j < 16; j++) {
 202             pos = 4 * ff_hevc_diag_scan4x4_y[j] + ff_hevc_diag_scan4x4_x[j];
 203             qm->ucScalingLists0[i][j] = sl->sl[0][i][pos];
 204         }
 205
 206         for (j = 0; j < 64; j++) {
 207             pos = 8 * ff_hevc_diag_scan8x8_y[j] + ff_hevc_diag_scan8x8_x[j];
 208             qm->ucScalingLists1[i][j] = sl->sl[1][i][pos];
 209             qm->ucScalingLists2[i][j] = sl->sl[2][i][pos];
 210
 211             if (i < 2)
 212                 qm->ucScalingLists3[i][j] = sl->sl[3][i][pos];
 213         }
 214
 215         qm->ucScalingListDCCoefSizeID2[i] = sl->sl_dc[0][i];
 216         if (i < 2)
 217             qm->ucScalingListDCCoefSizeID3[i] = sl->sl_dc[1][i];
 218     }
 219 }
 220
 221 static void fill_slice_short(DXVA_Slice_HEVC_Short *slice,
 222                              unsigned position, unsigned size)
 223 {
 224     memset(slice, 0, sizeof(*slice));
 225     slice->BSNALunitDataLocation = position;
 226     slice->SliceBytesInBuffer    = size;
 227     slice->wBadSliceChopping     = 0;
 228 }
 229
 230 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 231                                              DXVA2_DecodeBufferDesc *bs,
 232                                              DXVA2_DecodeBufferDesc *sc)
 233 {
 234     const HEVCContext *h = avctx->priv_data;
 235     struct dxva_context *ctx = avctx->hwaccel_context;
 236     const HEVCFrame *current_picture = h->ref;
 237     struct hevc_dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 238     DXVA_Slice_HEVC_Short *slice = NULL;
 239     void     *dxva_data_ptr;
 240     uint8_t  *dxva_data, *current, *end;
 241     unsigned dxva_size;
 242     void     *slice_data;
 243     unsigned slice_size;
 244     unsigned padding;
 245     unsigned i;
 246
 247     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 248     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 249                                               DXVA2_BitStreamDateBufferType,
 250                                               &dxva_data_ptr, &dxva_size)))
 251         return -1;
 252
 253     dxva_data = dxva_data_ptr;
 254     current = dxva_data;
 255     end = dxva_data + dxva_size;
 256
 257     for (i = 0; i < ctx_pic->slice_count; i++) {
 258         static const uint8_t start_code[] = { 0, 0, 1 };
 259         static const unsigned start_code_size = sizeof(start_code);
 260         unsigned position, size;
 261
 262         slice = &ctx_pic->slice_short[i];
 263
 264         position = slice->BSNALunitDataLocation;
 265         size     = slice->SliceBytesInBuffer;
 266         if (start_code_size + size > end - current) {
 267             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 268             break;
 269         }
 270
 271         slice->BSNALunitDataLocation = current - dxva_data;
 272         slice->SliceBytesInBuffer    = start_code_size + size;
 273
 274         memcpy(current, start_code, start_code_size);
 275         current += start_code_size;
 276
 277         memcpy(current, &ctx_pic->bitstream[position], size);
 278         current += size;
 279     }
 280     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 281     if (slice && padding > 0) {
 282         memset(current, 0, padding);
 283         current += padding;
 284
 285         slice->SliceBytesInBuffer += padding;
 286     }
 287     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 288                                                   DXVA2_BitStreamDateBufferType)))
 289         return -1;
 290     if (i < ctx_pic->slice_count)
 291         return -1;
 292
 293     memset(bs, 0, sizeof(*bs));
 294     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 295     bs->DataSize             = current - dxva_data;
 296     bs->NumMBsInBuffer       = 0;
 297
 298     slice_data = ctx_pic->slice_short;
 299     slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 300
 301     av_assert0((bs->DataSize & 127) == 0);
 302     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 303                                   DXVA2_SliceControlBufferType,
 304                                   slice_data, slice_size, 0);
 305 }
 306
 307
 308 static int dxva2_hevc_start_frame(AVCodecContext *avctx,
 309                                   av_unused const uint8_t *buffer,
 310                                   av_unused uint32_t size)
 311 {
 312     const HEVCContext *h = avctx->priv_data;
 313     struct dxva_context *ctx = avctx->hwaccel_context;
 314     struct hevc_dxva2_picture_context *ctx_pic = h->ref->hwaccel_picture_private;
 315
 316     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 317         return -1;
 318     av_assert0(ctx_pic);
 319
 320     /* Fill up DXVA_PicParams_HEVC */
 321     fill_picture_parameters(ctx, h, &ctx_pic->pp);
 322
 323     /* Fill up DXVA_Qmatrix_HEVC */
 324     fill_scaling_lists(ctx, h, &ctx_pic->qm);
 325
 326     ctx_pic->slice_count    = 0;
 327     ctx_pic->bitstream_size = 0;
 328     ctx_pic->bitstream      = NULL;
 329     return 0;
 330 }
 331
 332 static int dxva2_hevc_decode_slice(AVCodecContext *avctx,
 333                                    const uint8_t *buffer,
 334                                    uint32_t size)
 335 {
 336     const HEVCContext *h = avctx->priv_data;
 337     const HEVCFrame *current_picture = h->ref;
 338     struct hevc_dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 339     unsigned position;
 340
 341     if (ctx_pic->slice_count >= MAX_SLICES)
 342         return -1;
 343
 344     if (!ctx_pic->bitstream)
 345         ctx_pic->bitstream = buffer;
 346     ctx_pic->bitstream_size += size;
 347
 348     position = buffer - ctx_pic->bitstream;
 349     fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count], position, size);
 350     ctx_pic->slice_count++;
 351
 352     return 0;
 353 }
 354
 355 static int dxva2_hevc_end_frame(AVCodecContext *avctx)
 356 {
 357     HEVCContext *h = avctx->priv_data;
 358     struct hevc_dxva2_picture_context *ctx_pic = h->ref->hwaccel_picture_private;
 359     int scale = ctx_pic->pp.dwCodingParamToolFlags & 1;
 360     int ret;
 361
 362     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 363         return -1;
 364
 365     ret = ff_dxva2_common_end_frame(avctx, h->ref->frame,
 366                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 367                                     scale ? &ctx_pic->qm : NULL, scale ? sizeof(ctx_pic->qm) : 0,
 368                                     commit_bitstream_and_slice_buffer);
 369     return ret;
 370 }
 371
 372 AVHWAccel ff_hevc_dxva2_hwaccel = {
 373     .name           = "hevc_dxva2",
 374     .type           = AVMEDIA_TYPE_VIDEO,
 375     .id             = AV_CODEC_ID_HEVC,
 376     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 377     .start_frame    = dxva2_hevc_start_frame,
 378     .decode_slice   = dxva2_hevc_decode_slice,
 379     .end_frame      = dxva2_hevc_end_frame,
 380     .frame_priv_data_size = sizeof(struct hevc_dxva2_picture_context),
 381 };