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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.  
  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 Picture *current_picture = h->cur_pic_ptr;
  48.     int i, j;
  49.  
  50.     memset(pp, 0, sizeof(*pp));
  51.     /* Configure current picture */
  52.     fill_picture_entry(&pp->CurrPic,
  53.                        ff_dxva2_get_surface_index(ctx, current_picture),
  54.                        h->picture_structure == PICT_BOTTOM_FIELD);
  55.     /* Configure the set of references */
  56.     pp->UsedForReferenceFlags  = 0;
  57.     pp->NonExistingFrameFlags  = 0;
  58.     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
  59.         const Picture *r;
  60.         if (j < h->short_ref_count) {
  61.             r = h->short_ref[j++];
  62.         } else {
  63.             r = NULL;
  64.             while (!r && j < h->short_ref_count + 16)
  65.                 r = h->long_ref[j++ - h->short_ref_count];
  66.         }
  67.         if (r) {
  68.             fill_picture_entry(&pp->RefFrameList[i],
  69.                                ff_dxva2_get_surface_index(ctx, r),
  70.                                r->long_ref != 0);
  71.  
  72.             if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
  73.                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
  74.             if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
  75.                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
  76.  
  77.             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
  78.             if (r->reference & PICT_TOP_FIELD)
  79.                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
  80.             if (r->reference & PICT_BOTTOM_FIELD)
  81.                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
  82.         } else {
  83.             pp->RefFrameList[i].bPicEntry = 0xff;
  84.             pp->FieldOrderCntList[i][0]   = 0;
  85.             pp->FieldOrderCntList[i][1]   = 0;
  86.             pp->FrameNumList[i]           = 0;
  87.         }
  88.     }
  89.  
  90.     pp->wFrameWidthInMbsMinus1        = h->mb_width  - 1;
  91.     pp->wFrameHeightInMbsMinus1       = h->mb_height - 1;
  92.     pp->num_ref_frames                = h->sps.ref_frame_count;
  93.  
  94.     pp->wBitFields                    = ((h->picture_structure != PICT_FRAME) <<  0) |
  95.                                         ((h->sps.mb_aff &&
  96.                                         (h->picture_structure == PICT_FRAME)) <<  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 dxva2_h264_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 ((h->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 ((h->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.     unsigned list;
  203.  
  204.     memset(slice, 0, sizeof(*slice));
  205.     slice->BSNALunitDataLocation = position;
  206.     slice->SliceBytesInBuffer    = size;
  207.     slice->wBadSliceChopping     = 0;
  208.  
  209.     slice->first_mb_in_slice     = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
  210.     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
  211.     slice->BitOffsetToSliceData  = get_bits_count(&h->gb);
  212.     slice->slice_type            = ff_h264_get_slice_type(h);
  213.     if (h->slice_type_fixed)
  214.         slice->slice_type += 5;
  215.     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
  216.     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
  217.     if (h->list_count > 0)
  218.         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
  219.     if (h->list_count > 1)
  220.         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
  221.     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
  222.     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
  223.     slice->Reserved8Bits                = 0;
  224.  
  225.     for (list = 0; list < 2; list++) {
  226.         unsigned i;
  227.         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
  228.             if (list < h->list_count && i < h->ref_count[list]) {
  229.                 const Picture *r = &h->ref_list[list][i];
  230.                 unsigned plane;
  231.                 fill_picture_entry(&slice->RefPicList[list][i],
  232.                                    ff_dxva2_get_surface_index(ctx, r),
  233.                                    r->reference == PICT_BOTTOM_FIELD);
  234.                 for (plane = 0; plane < 3; plane++) {
  235.                     int w, o;
  236.                     if (plane == 0 && h->luma_weight_flag[list]) {
  237.                         w = h->luma_weight[i][list][0];
  238.                         o = h->luma_weight[i][list][1];
  239.                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
  240.                         w = h->chroma_weight[i][list][plane-1][0];
  241.                         o = h->chroma_weight[i][list][plane-1][1];
  242.                     } else {
  243.                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
  244.                                                h->chroma_log2_weight_denom);
  245.                         o = 0;
  246.                     }
  247.                     slice->Weights[list][i][plane][0] = w;
  248.                     slice->Weights[list][i][plane][1] = o;
  249.                 }
  250.             } else {
  251.                 unsigned plane;
  252.                 slice->RefPicList[list][i].bPicEntry = 0xff;
  253.                 for (plane = 0; plane < 3; plane++) {
  254.                     slice->Weights[list][i][plane][0] = 0;
  255.                     slice->Weights[list][i][plane][1] = 0;
  256.                 }
  257.             }
  258.         }
  259.     }
  260.     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
  261.     slice->slice_qp_delta    = h->qscale - h->pps.init_qp;
  262.     slice->redundant_pic_cnt = h->redundant_pic_count;
  263.     if (h->slice_type == AV_PICTURE_TYPE_B)
  264.         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
  265.     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
  266.     if (h->deblocking_filter < 2)
  267.         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
  268.     else
  269.         slice->disable_deblocking_filter_idc = h->deblocking_filter;
  270.     slice->slice_id = h->current_slice - 1;
  271. }
  272.  
  273. static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
  274.                                              DXVA2_DecodeBufferDesc *bs,
  275.                                              DXVA2_DecodeBufferDesc *sc)
  276. {
  277.     const H264Context *h = avctx->priv_data;
  278.     const unsigned mb_count = h->mb_width * h->mb_height;
  279.     struct dxva_context *ctx = avctx->hwaccel_context;
  280.     const Picture *current_picture = h->cur_pic_ptr;
  281.     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
  282.     DXVA_Slice_H264_Short *slice = NULL;
  283.     uint8_t  *dxva_data, *current, *end;
  284.     unsigned dxva_size;
  285.     void     *slice_data;
  286.     unsigned slice_size;
  287.     unsigned padding;
  288.     unsigned i;
  289.  
  290.     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
  291.     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
  292.                                                DXVA2_BitStreamDateBufferType,
  293.                                                (void **)&dxva_data, &dxva_size)))
  294.         return -1;
  295.     current = dxva_data;
  296.     end = dxva_data + dxva_size;
  297.  
  298.     for (i = 0; i < ctx_pic->slice_count; i++) {
  299.         static const uint8_t start_code[] = { 0, 0, 1 };
  300.         static const unsigned start_code_size = sizeof(start_code);
  301.         unsigned position, size;
  302.  
  303.         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
  304.                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
  305.         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
  306.                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
  307.  
  308.         if (is_slice_short(ctx))
  309.             slice = &ctx_pic->slice_short[i];
  310.         else
  311.             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
  312.  
  313.         position = slice->BSNALunitDataLocation;
  314.         size     = slice->SliceBytesInBuffer;
  315.         if (start_code_size + size > end - current) {
  316.             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
  317.             break;
  318.         }
  319.  
  320.         slice->BSNALunitDataLocation = current - dxva_data;
  321.         slice->SliceBytesInBuffer    = start_code_size + size;
  322.  
  323.         if (!is_slice_short(ctx)) {
  324.             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
  325.             if (i < ctx_pic->slice_count - 1)
  326.                 slice_long->NumMbsForSlice =
  327.                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
  328.             else
  329.                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
  330.         }
  331.  
  332.         memcpy(current, start_code, start_code_size);
  333.         current += start_code_size;
  334.  
  335.         memcpy(current, &ctx_pic->bitstream[position], size);
  336.         current += size;
  337.     }
  338.     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
  339.     if (slice && padding > 0) {
  340.         memset(current, 0, padding);
  341.         current += padding;
  342.  
  343.         slice->SliceBytesInBuffer += padding;
  344.     }
  345.     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
  346.                                                   DXVA2_BitStreamDateBufferType)))
  347.         return -1;
  348.     if (i < ctx_pic->slice_count)
  349.         return -1;
  350.  
  351.     memset(bs, 0, sizeof(*bs));
  352.     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
  353.     bs->DataSize             = current - dxva_data;
  354.     bs->NumMBsInBuffer       = mb_count;
  355.  
  356.     if (is_slice_short(ctx)) {
  357.         slice_data = ctx_pic->slice_short;
  358.         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
  359.     } else {
  360.         slice_data = ctx_pic->slice_long;
  361.         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
  362.     }
  363.     assert((bs->DataSize & 127) == 0);
  364.     return ff_dxva2_commit_buffer(avctx, ctx, sc,
  365.                                   DXVA2_SliceControlBufferType,
  366.                                   slice_data, slice_size, mb_count);
  367. }
  368.  
  369.  
  370. static int dxva2_h264_start_frame(AVCodecContext *avctx,
  371.                                   av_unused const uint8_t *buffer,
  372.                                   av_unused uint32_t size)
  373. {
  374.     const H264Context *h = avctx->priv_data;
  375.     struct dxva_context *ctx = avctx->hwaccel_context;
  376.     struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
  377.  
  378.     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
  379.         return -1;
  380.     assert(ctx_pic);
  381.  
  382.     /* Fill up DXVA_PicParams_H264 */
  383.     fill_picture_parameters(ctx, h, &ctx_pic->pp);
  384.  
  385.     /* Fill up DXVA_Qmatrix_H264 */
  386.     fill_scaling_lists(ctx, h, &ctx_pic->qm);
  387.  
  388.     ctx_pic->slice_count    = 0;
  389.     ctx_pic->bitstream_size = 0;
  390.     ctx_pic->bitstream      = NULL;
  391.     return 0;
  392. }
  393.  
  394. static int dxva2_h264_decode_slice(AVCodecContext *avctx,
  395.                                    const uint8_t *buffer,
  396.                                    uint32_t size)
  397. {
  398.     const H264Context *h = avctx->priv_data;
  399.     struct dxva_context *ctx = avctx->hwaccel_context;
  400.     const Picture *current_picture = h->cur_pic_ptr;
  401.     struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
  402.     unsigned position;
  403.  
  404.     if (ctx_pic->slice_count >= MAX_SLICES)
  405.         return -1;
  406.  
  407.     if (!ctx_pic->bitstream)
  408.         ctx_pic->bitstream = buffer;
  409.     ctx_pic->bitstream_size += size;
  410.  
  411.     position = buffer - ctx_pic->bitstream;
  412.     if (is_slice_short(ctx))
  413.         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
  414.                          position, size);
  415.     else
  416.         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
  417.                         position, size);
  418.     ctx_pic->slice_count++;
  419.  
  420.     if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
  421.         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
  422.     return 0;
  423. }
  424.  
  425. static int dxva2_h264_end_frame(AVCodecContext *avctx)
  426. {
  427.     H264Context *h = avctx->priv_data;
  428.     struct dxva2_picture_context *ctx_pic =
  429.         h->cur_pic_ptr->hwaccel_picture_private;
  430.     int ret;
  431.  
  432.     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
  433.         return -1;
  434.     ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr,
  435.                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
  436.                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
  437.                                     commit_bitstream_and_slice_buffer);
  438.     if (!ret)
  439.         ff_h264_draw_horiz_band(h, 0, h->avctx->height);
  440.     return ret;
  441. }
  442.  
  443. AVHWAccel ff_h264_dxva2_hwaccel = {
  444.     .name           = "h264_dxva2",
  445.     .type           = AVMEDIA_TYPE_VIDEO,
  446.     .id             = AV_CODEC_ID_H264,
  447.     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
  448.     .start_frame    = dxva2_h264_start_frame,
  449.     .decode_slice   = dxva2_h264_decode_slice,
  450.     .end_frame      = dxva2_h264_end_frame,
  451.     .priv_data_size = sizeof(struct dxva2_picture_context),
  452. };
  453.