gst-libs/ext/ffmpeg/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;
  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; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  60         if (i < h->short_ref_count + h->long_ref_count) {
  61             const Picture *r;
  62             if (i < h->short_ref_count) {
  63                 r = h->short_ref[i];
  64                 assert(!r->long_ref);
  65             } else {
  66                 r = h->long_ref[i - h->short_ref_count];
  67                 assert(r->long_ref);
  68             }
  69             fill_picture_entry(&pp->RefFrameList[i],
  70                                ff_dxva2_get_surface_index(ctx, r),
  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        = 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     pp->Reserved16Bits                = 3; /* FIXME is there a way to detect the right mode ? */
 117     pp->StatusReportFeedbackNumber    = 1 + ctx->report_id++;
 118     pp->CurrFieldOrderCnt[0] = 0;
 119     if ((s->picture_structure & PICT_TOP_FIELD) &&
 120         current_picture->field_poc[0] != INT_MAX)
 121         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
 122     pp->CurrFieldOrderCnt[1] = 0;
 123     if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
 124         current_picture->field_poc[1] != INT_MAX)
 125         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
 126     pp->pic_init_qs_minus26           = h->pps.init_qs - 26;
 127     pp->chroma_qp_index_offset        = h->pps.chroma_qp_index_offset[0];
 128     pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
 129     pp->ContinuationFlag              = 1;
 130     pp->pic_init_qp_minus26           = h->pps.init_qp - 26;
 131     pp->num_ref_idx_l0_active_minus1  = h->pps.ref_count[0] - 1;
 132     pp->num_ref_idx_l1_active_minus1  = h->pps.ref_count[1] - 1;
 133     pp->Reserved8BitsA                = 0;
 134     pp->frame_num                     = h->frame_num;
 135     pp->log2_max_frame_num_minus4     = h->sps.log2_max_frame_num - 4;
 136     pp->pic_order_cnt_type            = h->sps.poc_type;
 137     if (h->sps.poc_type == 0)
 138         pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
 139     else if (h->sps.poc_type == 1)
 140         pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
 141     pp->direct_8x8_inference_flag     = h->sps.direct_8x8_inference_flag;
 142     pp->entropy_coding_mode_flag      = h->pps.cabac;
 143     pp->pic_order_present_flag        = h->pps.pic_order_present;
 144     pp->num_slice_groups_minus1       = h->pps.slice_group_count - 1;
 145     pp->slice_group_map_type          = h->pps.mb_slice_group_map_type;
 146     pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
 147     pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
 148     pp->Reserved8BitsB                = 0;
 149     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
 150     //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
 151 }
 152
 153 static void fill_scaling_lists(const H264Context *h, DXVA_Qmatrix_H264 *qm)
 154 {
 155     unsigned i, j;
 156     memset(qm, 0, sizeof(*qm));
 157     for (i = 0; i < 6; i++)
 158         for (j = 0; j < 16; j++)
 159             qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
 160
 161     for (i = 0; i < 2; i++)
 162         for (j = 0; j < 64; j++)
 163             qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][ff_zigzag_direct[j]];
 164 }
 165
 166 static int is_slice_short(struct dxva_context *ctx)
 167 {
 168     assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
 169            ctx->cfg->ConfigBitstreamRaw == 2);
 170     return ctx->cfg->ConfigBitstreamRaw == 2;
 171 }
 172
 173 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
 174                              unsigned position, unsigned size)
 175 {
 176     memset(slice, 0, sizeof(*slice));
 177     slice->BSNALunitDataLocation = position;
 178     slice->SliceBytesInBuffer    = size;
 179     slice->wBadSliceChopping     = 0;
 180 }
 181
 182 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
 183                             unsigned position, unsigned size)
 184 {
 185     const H264Context *h = avctx->priv_data;
 186     struct dxva_context *ctx = avctx->hwaccel_context;
 187     const MpegEncContext *s = &h->s;
 188     unsigned list;
 189
 190     memset(slice, 0, sizeof(*slice));
 191     slice->BSNALunitDataLocation = position;
 192     slice->SliceBytesInBuffer    = size;
 193     slice->wBadSliceChopping     = 0;
 194
 195     slice->first_mb_in_slice     = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
 196     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
 197     slice->BitOffsetToSliceData  = get_bits_count(&s->gb) + 8;
 198     slice->slice_type            = ff_h264_get_slice_type(h);
 199     if (h->slice_type_fixed)
 200         slice->slice_type += 5;
 201     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
 202     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
 203     if (h->list_count > 0)
 204         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
 205     if (h->list_count > 1)
 206         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
 207     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
 208     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
 209     slice->Reserved8Bits                = 0;
 210
 211     for (list = 0; list < 2; list++) {
 212         unsigned i;
 213         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
 214             if (list < h->list_count && i < h->ref_count[list]) {
 215                 const Picture *r = &h->ref_list[list][i];
 216                 unsigned plane;
 217                 fill_picture_entry(&slice->RefPicList[list][i],
 218                                    ff_dxva2_get_surface_index(ctx, r),
 219                                    r->reference == PICT_BOTTOM_FIELD);
 220                 for (plane = 0; plane < 3; plane++) {
 221                     int w, o;
 222                     if (plane == 0 && h->luma_weight_flag[list]) {
 223                         w = h->luma_weight[i][list][0];
 224                         o = h->luma_weight[i][list][1];
 225                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
 226                         w = h->chroma_weight[i][list][plane-1][0];
 227                         o = h->chroma_weight[i][list][plane-1][1];
 228                     } else {
 229                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
 230                                                h->chroma_log2_weight_denom);
 231                         o = 0;
 232                     }
 233                     slice->Weights[list][i][plane][0] = w;
 234                     slice->Weights[list][i][plane][1] = o;
 235                 }
 236             } else {
 237                 unsigned plane;
 238                 slice->RefPicList[list][i].bPicEntry = 0xff;
 239                 for (plane = 0; plane < 3; plane++) {
 240                     slice->Weights[list][i][plane][0] = 0;
 241                     slice->Weights[list][i][plane][1] = 0;
 242                 }
 243             }
 244         }
 245     }
 246     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
 247     slice->slice_qp_delta    = s->qscale - h->pps.init_qp;
 248     slice->redundant_pic_cnt = h->redundant_pic_count;
 249     if (h->slice_type == FF_B_TYPE)
 250         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
 251     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
 252     if (h->deblocking_filter < 2)
 253         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
 254     else
 255         slice->disable_deblocking_filter_idc = h->deblocking_filter;
 256     slice->slice_id = h->current_slice - 1;
 257 }
 258
 259 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 260                                              DXVA2_DecodeBufferDesc *bs,
 261                                              DXVA2_DecodeBufferDesc *sc)
 262 {
 263     const H264Context *h = avctx->priv_data;
 264     const MpegEncContext *s = &h->s;
 265     const unsigned mb_count = s->mb_width * s->mb_height;
 266     struct dxva_context *ctx = avctx->hwaccel_context;
 267     const Picture *current_picture = h->s.current_picture_ptr;
 268     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 269     DXVA_Slice_H264_Short *slice = NULL;
 270     uint8_t  *dxva_data, *current, *end;
 271     unsigned dxva_size;
 272     void     *slice_data;
 273     unsigned slice_size;
 274     unsigned padding;
 275     unsigned i;
 276
 277     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
 278     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 279                                                DXVA2_BitStreamDateBufferType,
 280                                                &dxva_data, &dxva_size)))
 281         return -1;
 282     current = dxva_data;
 283     end = dxva_data + dxva_size;
 284
 285     for (i = 0; i < ctx_pic->slice_count; i++) {
 286         static const uint8_t start_code[] = { 0, 0, 1 };
 287         static const unsigned start_code_size = sizeof(start_code);
 288         unsigned position, size;
 289
 290         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
 291                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
 292         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
 293                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
 294
 295         if (is_slice_short(ctx))
 296             slice = &ctx_pic->slice_short[i];
 297         else
 298             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
 299
 300         position = slice->BSNALunitDataLocation;
 301         size     = slice->SliceBytesInBuffer;
 302         if (start_code_size + size > end - current) {
 303             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 304             break;
 305         }
 306
 307         slice->BSNALunitDataLocation = current - dxva_data;
 308         slice->SliceBytesInBuffer    = start_code_size + size;
 309
 310         if (!is_slice_short(ctx)) {
 311             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
 312             if (i < ctx_pic->slice_count - 1)
 313                 slice_long->NumMbsForSlice =
 314                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
 315             else
 316                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
 317         }
 318
 319         memcpy(current, start_code, start_code_size);
 320         current += start_code_size;
 321
 322         memcpy(current, &ctx_pic->bitstream[position], size);
 323         current += size;
 324     }
 325     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
 326     if (slice && padding > 0) {
 327         memset(current, 0, padding);
 328         current += padding;
 329
 330         slice->SliceBytesInBuffer += padding;
 331     }
 332     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 333                                                   DXVA2_BitStreamDateBufferType)))
 334         return -1;
 335     if (i < ctx_pic->slice_count)
 336         return -1;
 337
 338     memset(bs, 0, sizeof(*bs));
 339     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 340     bs->DataSize             = current - dxva_data;
 341     bs->NumMBsInBuffer       = mb_count;
 342
 343     if (is_slice_short(ctx)) {
 344         slice_data = ctx_pic->slice_short;
 345         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
 346     } else {
 347         slice_data = ctx_pic->slice_long;
 348         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
 349     }
 350     assert((bs->DataSize & 127) == 0);
 351     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 352                                   DXVA2_SliceControlBufferType,
 353                                   slice_data, slice_size, mb_count);
 354 }
 355
 356
 357 static int start_frame(AVCodecContext *avctx,
 358                        av_unused const uint8_t *buffer,
 359                        av_unused uint32_t size)
 360 {
 361     const H264Context *h = avctx->priv_data;
 362     struct dxva_context *ctx = avctx->hwaccel_context;
 363     struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->hwaccel_picture_private;
 364
 365     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 366         return -1;
 367     assert(ctx_pic);
 368
 369     /* Fill up DXVA_PicParams_H264 */
 370     fill_picture_parameters(ctx, h, &ctx_pic->pp);
 371
 372     /* Fill up DXVA_Qmatrix_H264 */
 373     fill_scaling_lists(h, &ctx_pic->qm);
 374
 375     ctx_pic->slice_count    = 0;
 376     ctx_pic->bitstream_size = 0;
 377     ctx_pic->bitstream      = NULL;
 378     return 0;
 379 }
 380
 381 static int decode_slice(AVCodecContext *avctx,
 382                         const uint8_t *buffer, uint32_t size)
 383 {
 384     const H264Context *h = avctx->priv_data;
 385     struct dxva_context *ctx = avctx->hwaccel_context;
 386     const Picture *current_picture = h->s.current_picture_ptr;
 387     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
 388     unsigned position;
 389
 390     if (ctx_pic->slice_count >= MAX_SLICES)
 391         return -1;
 392
 393     if (!ctx_pic->bitstream)
 394         ctx_pic->bitstream = buffer;
 395     ctx_pic->bitstream_size += size;
 396
 397     position = buffer - ctx_pic->bitstream;
 398     if (is_slice_short(ctx))
 399         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
 400                          position, size);
 401     else
 402         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
 403                         position, size);
 404     ctx_pic->slice_count++;
 405
 406     if (h->slice_type != FF_I_TYPE && h->slice_type != FF_SI_TYPE)
 407         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
 408     return 0;
 409 }
 410
 411 static int end_frame(AVCodecContext *avctx)
 412 {
 413     H264Context *h = avctx->priv_data;
 414     MpegEncContext *s = &h->s;
 415     struct dxva2_picture_context *ctx_pic =
 416         h->s.current_picture_ptr->hwaccel_picture_private;
 417
 418     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 419         return -1;
 420     return ff_dxva2_common_end_frame(avctx, s,
 421                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
 422                                      &ctx_pic->qm, sizeof(ctx_pic->qm),
 423                                      commit_bitstream_and_slice_buffer);
 424 }
 425
 426 AVHWAccel h264_dxva2_hwaccel = {
 427     .name           = "h264_dxva2",
 428     .type           = AVMEDIA_TYPE_VIDEO,
 429     .id             = CODEC_ID_H264,
 430     .pix_fmt        = PIX_FMT_DXVA2_VLD,
 431     .capabilities   = 0,
 432     .start_frame    = start_frame,
 433     .decode_slice   = decode_slice,
 434     .end_frame      = end_frame,
 435     .priv_data_size = sizeof(struct dxva2_picture_context),
 436 };
 437