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
  27 struct dxva2_picture_context {
  28     DXVA_PicParams_H264   pp;
  29     DXVA_Qmatrix_H264     qm;
  30     unsigned              slice_count;
  31     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
  32     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
  33     const uint8_t         *bitstream;
  34     unsigned              bitstream_size;
  35 };
  36
  37 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
  38                                unsigned index, unsigned flag)
  39 {
  40     assert((index&0x7f) == index && (flag&0x01) == flag);
  41     pic->bPicEntry = index | (flag << 7);
  42 }
  43
  44 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
  45                                     DXVA_PicParams_H264 *pp)
  46 {
  47     const MpegEncContext *s = &h->s;
  48     const Picture *current_picture = s->current_picture_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),
  55                        s->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 Picture *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),
  71                                r->long_ref != 0);
  72
  73             if ((r->f.reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  74                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  75             if ((r->f.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->f.reference & PICT_TOP_FIELD)
  80                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  81             if (r->f.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        = s->mb_width  - 1;
  92     pp->wFrameHeightInMbsMinus1       = s->mb_height - 1;
  93     pp->num_ref_frames                = h->sps.ref_frame_count;
  94
  95     pp->wBitFields                    = ((s->picture_structure != PICT_FRAME) <<  0) |
  96                                         (h->sps.mb_aff                        <<  1) |
  97                                         (h->sps.residual_color_transform_flag <<  2) |
  98                                         /* sp_for_switch_flag (not implemented by FFmpeg) */
  99                                         (0                                    <<  3) |
 100                                         (h->sps.chroma_format_idc             <<  4) |
 101                                         ((h->nal_ref_idc != 0)                <<  6) |
 102                                         (h->pps.constrained_intra_pred        <<  7) |
 103                                         (h->pps.weighted_pred                 <<  8) |
 104                                         (h->pps.weighted_bipred_idc           <<  9) |
 105                                         /* MbsConsecutiveFlag */
 106                                         (1                                    << 11) |
 107                                         (h->sps.frame_mbs_only_flag           << 12) |
 108                                         (h->pps.transform_8x8_mode            << 13) |
 109                                         ((h->sps.level_idc >= 31)             << 14) |
 110                                         /* IntraPicFlag (Modified if we detect a non
 111                                          * intra slice in decode_slice) */
 112                                         (1                                    << 15);
 113
 114     pp->bit_depth_luma_minus8         = h->sps.bit_depth_luma - 8;
 115     pp->bit_depth_chroma_minus8       = h->sps.bit_depth_chroma - 8;
 116     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
 117         pp->Reserved16Bits            = 0;
 118     else
 119         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
 120     pp->StatusReportFeedbackNumber    = 1 + ctx->report_id++;
 121     pp->CurrFieldOrderCnt[0] = 0;
 122     if ((s->picture_structure & PICT_TOP_FIELD) &&
 123         current_picture->field_poc[0] != INT_MAX)
 124         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 125     pp->CurrFieldOrderCnt[1] = 0;
 126     if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
 127         current_picture->field_poc[1] != INT_MAX)
 128         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 129     pp->pic_init_qs_minus26           = h->pps.init_qs - 26;
 130     pp->chroma_qp_index_offset        = h->pps.chroma_qp_index_offset[0];
 131     pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
 132     pp->ContinuationFlag              = 1;
 133     pp->pic_init_qp_minus26           = h->pps.init_qp - 26;
 134     pp->num_ref_idx_l0_active_minus1  = h->pps.ref_count[0] - 1;
 135     pp->num_ref_idx_l1_active_minus1  = h->pps.ref_count[1] - 1;
 136     pp->Reserved8BitsA                = 0;
 137     pp->frame_num                     = h->frame_num;
 138     pp->log2_max_frame_num_minus4     = h->sps.log2_max_frame_num - 4;
 139     pp->pic_order_cnt_type            = h->sps.poc_type;
 140     if (h->sps.poc_type == 0)
 141         pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
 142     else if (h->sps.poc_type == 1)
 143         pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
 144     pp->direct_8x8_inference_flag     = h->sps.direct_8x8_inference_flag;
 145     pp->entropy_coding_mode_flag      = h->pps.cabac;
 146     pp->pic_order_present_flag        = h->pps.pic_order_present;
 147     pp->num_slice_groups_minus1       = h->pps.slice_group_count - 1;
 148     pp->slice_group_map_type          = h->pps.mb_slice_group_map_type;
 149     pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
 150     pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
 151     pp->Reserved8BitsB                = 0;
 152     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
 153     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
 154 }
 155
 156 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
 157 {
 158     unsigned i, j;
 159     memset(qm, 0, sizeof(*qm));
 160     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
 161         for (i = 0; i < 6; i++)
 162             for (j = 0; j < 16; j++)
 163                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
 164
 165         for (i = 0; i < 64; i++) {
 166             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
 167             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
 168         }
 169     } else {
 170         for (i = 0; i < 6; i++)
 171             for (j = 0; j < 16; j++)
 172                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
 173
 174         for (i = 0; i < 64; i++) {
 175             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
 176             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
 177         }
 178     }
 179 }
 180
 181 static int is_slice_short(struct dxva_context *ctx)
 182 {
 183     assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
 184            ctx->cfg->ConfigBitstreamRaw == 2);
 185     return ctx->cfg->ConfigBitstreamRaw == 2;
 186 }
 187
 188 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 189                              unsigned position, unsigned size)
 190 {
 191     memset(slice, 0, sizeof(*slice));
 192     slice->BSNALunitDataLocation = position;
 193     slice->SliceBytesInBuffer    = size;
 194     slice->wBadSliceChopping     = 0;
 195 }
 196
 197 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 198                             unsigned position, unsigned size)
 199 {
 200     const H264Context *h = avctx->priv_data;
 201     struct dxva_context *ctx = avctx->hwaccel_context;
 202     const MpegEncContext *s = &h->s;
 203     unsigned list;
 204
 205     memset(slice, 0, sizeof(*slice));
 206     slice->BSNALunitDataLocation = position;
 207     slice->SliceBytesInBuffer    = size;
 208     slice->wBadSliceChopping     = 0;
 209
 210     slice->first_mb_in_slice     = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
 211     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 212     slice->BitOffsetToSliceData  = get_bits_count(&s->gb);
 213     slice->slice_type            = ff_h264_get_slice_type(h);
 214     if (h->slice_type_fixed)
 215         slice->slice_type += 5;
 216     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
 217     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
 218     if (h->list_count > 0)
 219         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
 220     if (h->list_count > 1)
 221         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
 222     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
 223     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
 224     slice->Reserved8Bits                = 0;
 225
 226     for (list = 0; list < 2; list++) {
 227         unsigned i;
 228         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 229             if (list < h->list_count && i < h->ref_count[list]) {
 230                 const Picture *r = &h->ref_list[list][i];
 231                 unsigned plane;
 232                 fill_picture_entry(&slice->RefPicList[list][i],
 233                                    ff_dxva2_get_surface_index(ctx, r),
 234                                    r->f.reference == PICT_BOTTOM_FIELD);
 235                 for (plane = 0; plane < 3; plane++) {
 236                     int w, o;
 237                     if (plane == 0 && h->luma_weight_flag[list]) {
 238                         w = h->luma_weight[i][list][0];
 239                         o = h->luma_weight[i][list][1];
 240                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
 241                         w = h->chroma_weight[i][list][plane-1][0];
 242                         o = h->chroma_weight[i][list][plane-1][1];
 243                     } else {
 244                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
 245                                                h->chroma_log2_weight_denom);
 246                         o = 0;
 247                     }
 248                     slice->Weights[list][i][plane][0] = w;
 249                     slice->Weights[list][i][plane][1] = o;
 250                 }
 251             } else {
 252                 unsigned plane;
 253                 slice->RefPicList[list][i].bPicEntry = 0xff;
 254                 for (plane = 0; plane < 3; plane++) {
 255                     slice->Weights[list][i][plane][0] = 0;
 256                     slice->Weights[list][i][plane][1] = 0;
 257                 }
 258             }
 259         }
 260     }
 261     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 262     slice->slice_qp_delta    = s->qscale - h->pps.init_qp;
 263     slice->redundant_pic_cnt = h->redundant_pic_count;
 264     if (h->slice_type == AV_PICTURE_TYPE_B)
 265         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
 266     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
 267     if (h->deblocking_filter < 2)
 268         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
 269     else
 270         slice->disable_deblocking_filter_idc = h->deblocking_filter;
 271     slice->slice_id = h->current_slice - 1;
 272 }
 273
 274 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 275                                              DXVA2_DecodeBufferDesc *bs,
 276                                              DXVA2_DecodeBufferDesc *sc)
 277 {
 278     const H264Context *h = avctx->priv_data;
 279     const MpegEncContext *s = &h->s;
 280     const unsigned mb_count = s->mb_width * s->mb_height;
 281     struct dxva_context *ctx = avctx->hwaccel_context;
 282     const Picture *current_picture = h->s.current_picture_ptr;
 283     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
 284     DXVA_Slice_H264_Short *slice = NULL;
 285     uint8_t  *dxva_data, *current, *end;
 286     unsigned dxva_size;
 287     void     *slice_data;
 288     unsigned slice_size;
 289     unsigned padding;
 290     unsigned i;
 291
 292     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 293     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 294                                                DXVA2_BitStreamDateBufferType,
 295                                                &dxva_data, &dxva_size)))
 296         return -1;
 297     current = dxva_data;
 298     end = dxva_data + dxva_size;
 299
 300     for (i = 0; i < ctx_pic->slice_count; i++) {
 301         static const uint8_t start_code[] = { 0, 0, 1 };
 302         static const unsigned start_code_size = sizeof(start_code);
 303         unsigned position, size;
 304
 305         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 306                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 307         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 308                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 309
 310         if (is_slice_short(ctx))
 311             slice = &ctx_pic->slice_short[i];
 312         else
 313             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 314
 315         position = slice->BSNALunitDataLocation;
 316         size     = slice->SliceBytesInBuffer;
 317         if (start_code_size + size > end - current) {
 318             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 319             break;
 320         }
 321
 322         slice->BSNALunitDataLocation = current - dxva_data;
 323         slice->SliceBytesInBuffer    = start_code_size + size;
 324
 325         if (!is_slice_short(ctx)) {
 326             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 327             if (i < ctx_pic->slice_count - 1)
 328                 slice_long->NumMbsForSlice =
 329                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 330             else
 331                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 332         }
 333
 334         memcpy(current, start_code, start_code_size);
 335         current += start_code_size;
 336
 337         memcpy(current, &ctx_pic->bitstream[position], size);
 338         current += size;
 339     }
 340     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 341     if (slice && padding > 0) {
 342         memset(current, 0, padding);
 343         current += padding;
 344
 345         slice->SliceBytesInBuffer += padding;
 346     }
 347     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 348                                                   DXVA2_BitStreamDateBufferType)))
 349         return -1;
 350     if (i < ctx_pic->slice_count)
 351         return -1;
 352
 353     memset(bs, 0, sizeof(*bs));
 354     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 355     bs->DataSize             = current - dxva_data;
 356     bs->NumMBsInBuffer       = mb_count;
 357
 358     if (is_slice_short(ctx)) {
 359         slice_data = ctx_pic->slice_short;
 360         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 361     } else {
 362         slice_data = ctx_pic->slice_long;
 363         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 364     }
 365     assert((bs->DataSize & 127) == 0);
 366     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 367                                   DXVA2_SliceControlBufferType,
 368                                   slice_data, slice_size, mb_count);
 369 }
 370
 371
 372 static int start_frame(AVCodecContext *avctx,
 373                        av_unused const uint8_t *buffer,
 374                        av_unused uint32_t size)
 375 {
 376     const H264Context *h = avctx->priv_data;
 377     struct dxva_context *ctx = avctx->hwaccel_context;
 378     struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->f.hwaccel_picture_private;
 379
 380     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 381         return -1;
 382     assert(ctx_pic);
 383
 384     /* Fill up DXVA_PicParams_H264 */
 385     fill_picture_parameters(ctx, h, &ctx_pic->pp);
 386
 387     /* Fill up DXVA_Qmatrix_H264 */
 388     fill_scaling_lists(ctx, h, &ctx_pic->qm);
 389
 390     ctx_pic->slice_count    = 0;
 391     ctx_pic->bitstream_size = 0;
 392     ctx_pic->bitstream      = NULL;
 393     return 0;
 394 }
 395
 396 static int decode_slice(AVCodecContext *avctx,
 397                         const uint8_t *buffer, uint32_t size)
 398 {
 399     const H264Context *h = avctx->priv_data;
 400     struct dxva_context *ctx = avctx->hwaccel_context;
 401     const Picture *current_picture = h->s.current_picture_ptr;
 402     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
 403     unsigned position;
 404
 405     if (ctx_pic->slice_count >= MAX_SLICES)
 406         return -1;
 407
 408     if (!ctx_pic->bitstream)
 409         ctx_pic->bitstream = buffer;
 410     ctx_pic->bitstream_size += size;
 411
 412     position = buffer - ctx_pic->bitstream;
 413     if (is_slice_short(ctx))
 414         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 415                          position, size);
 416     else
 417         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 418                         position, size);
 419     ctx_pic->slice_count++;
 420
 421     if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
 422         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 423     return 0;
 424 }
 425
 426 static int end_frame(AVCodecContext *avctx)
 427 {
 428     H264Context *h = avctx->priv_data;
 429     MpegEncContext *s = &h->s;
 430     struct dxva2_picture_context *ctx_pic =
 431         h->s.current_picture_ptr->f.hwaccel_picture_private;
 432
 433     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 434         return -1;
 435     return ff_dxva2_common_end_frame(avctx, s,
 436                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
 437                                      &ctx_pic->qm, sizeof(ctx_pic->qm),
 438                                      commit_bitstream_and_slice_buffer);
 439 }
 440
 441 AVHWAccel ff_h264_dxva2_hwaccel = {
 442     .name           = "h264_dxva2",
 443     .type           = AVMEDIA_TYPE_VIDEO,
 444     .id             = CODEC_ID_H264,
 445     .pix_fmt        = PIX_FMT_DXVA2_VLD,
 446     .start_frame    = start_frame,
 447     .decode_slice   = decode_slice,
 448     .end_frame      = end_frame,
 449     .priv_data_size = sizeof(struct dxva2_picture_context),
 450 };
 451