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ffmpeg / libavcodec / dxva2_h264.c @ 2912e87a

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/*
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 * DXVA2 H264 HW acceleration.
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 *
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 * copyright (c) 2009 Laurent Aimar
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "dxva2_internal.h"
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#include "h264.h"
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#include "h264data.h"
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struct dxva2_picture_context {
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    DXVA_PicParams_H264   pp;
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    DXVA_Qmatrix_H264     qm;
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    unsigned              slice_count;
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    DXVA_Slice_H264_Short slice_short[MAX_SLICES];
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    DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
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    const uint8_t         *bitstream;
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    unsigned              bitstream_size;
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};
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static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
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                               unsigned index, unsigned flag)
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{
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    assert((index&0x7f) == index && (flag&0x01) == flag);
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    pic->bPicEntry = index | (flag << 7);
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}
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static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
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                                    DXVA_PicParams_H264 *pp)
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{
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    const MpegEncContext *s = &h->s;
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    const Picture *current_picture = s->current_picture_ptr;
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    int i, j;
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    memset(pp, 0, sizeof(*pp));
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    /* Configure current picture */
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    fill_picture_entry(&pp->CurrPic,
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                       ff_dxva2_get_surface_index(ctx, current_picture),
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                       s->picture_structure == PICT_BOTTOM_FIELD);
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    /* Configure the set of references */
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    pp->UsedForReferenceFlags  = 0;
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    pp->NonExistingFrameFlags  = 0;
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    for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
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        const Picture *r;
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        if (j < h->short_ref_count) {
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            r = h->short_ref[j++];
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        } else {
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            r = NULL;
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            while (!r && j < h->short_ref_count + 16)
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                r = h->long_ref[j++ - h->short_ref_count];
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        }
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        if (r) {
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            fill_picture_entry(&pp->RefFrameList[i],
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                               ff_dxva2_get_surface_index(ctx, r),
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                               r->long_ref != 0);
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            if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
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                pp->FieldOrderCntList[i][0] = r->field_poc[0];
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            if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
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                pp->FieldOrderCntList[i][1] = r->field_poc[1];
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            pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
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            if (r->reference & PICT_TOP_FIELD)
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                pp->UsedForReferenceFlags |= 1 << (2*i + 0);
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            if (r->reference & PICT_BOTTOM_FIELD)
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                pp->UsedForReferenceFlags |= 1 << (2*i + 1);
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        } else {
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            pp->RefFrameList[i].bPicEntry = 0xff;
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            pp->FieldOrderCntList[i][0]   = 0;
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            pp->FieldOrderCntList[i][1]   = 0;
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            pp->FrameNumList[i]           = 0;
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        }
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    }
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    pp->wFrameWidthInMbsMinus1        = s->mb_width  - 1;
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    pp->wFrameHeightInMbsMinus1       = s->mb_height - 1;
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    pp->num_ref_frames                = h->sps.ref_frame_count;
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    pp->wBitFields                    = ((s->picture_structure != PICT_FRAME) <<  0) |
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                                        (h->sps.mb_aff                        <<  1) |
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                                        (h->sps.residual_color_transform_flag <<  2) |
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                                        /* sp_for_switch_flag (not implemented by FFmpeg) */
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                                        (0                                    <<  3) |
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                                        (h->sps.chroma_format_idc             <<  4) |
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                                        ((h->nal_ref_idc != 0)                <<  6) |
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                                        (h->pps.constrained_intra_pred        <<  7) |
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                                        (h->pps.weighted_pred                 <<  8) |
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                                        (h->pps.weighted_bipred_idc           <<  9) |
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                                        /* MbsConsecutiveFlag */
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                                        (1                                    << 11) |
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                                        (h->sps.frame_mbs_only_flag           << 12) |
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                                        (h->pps.transform_8x8_mode            << 13) |
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                                        ((h->sps.level_idc >= 31)             << 14) |
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                                        /* IntraPicFlag (Modified if we detect a non
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                                         * intra slice in decode_slice) */
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                                        (1                                    << 15);
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    pp->bit_depth_luma_minus8         = h->sps.bit_depth_luma - 8;
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    pp->bit_depth_chroma_minus8       = h->sps.bit_depth_chroma - 8;
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    pp->Reserved16Bits                = 3; /* FIXME is there a way to detect the right mode ? */
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    pp->StatusReportFeedbackNumber    = 1 + ctx->report_id++;
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    pp->CurrFieldOrderCnt[0] = 0;
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    if ((s->picture_structure & PICT_TOP_FIELD) &&
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        current_picture->field_poc[0] != INT_MAX)
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        pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
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    pp->CurrFieldOrderCnt[1] = 0;
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    if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
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        current_picture->field_poc[1] != INT_MAX)
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        pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
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    pp->pic_init_qs_minus26           = h->pps.init_qs - 26;
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    pp->chroma_qp_index_offset        = h->pps.chroma_qp_index_offset[0];
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    pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
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    pp->ContinuationFlag              = 1;
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    pp->pic_init_qp_minus26           = h->pps.init_qp - 26;
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    pp->num_ref_idx_l0_active_minus1  = h->pps.ref_count[0] - 1;
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    pp->num_ref_idx_l1_active_minus1  = h->pps.ref_count[1] - 1;
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    pp->Reserved8BitsA                = 0;
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    pp->frame_num                     = h->frame_num;
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    pp->log2_max_frame_num_minus4     = h->sps.log2_max_frame_num - 4;
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    pp->pic_order_cnt_type            = h->sps.poc_type;
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    if (h->sps.poc_type == 0)
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        pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
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    else if (h->sps.poc_type == 1)
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        pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
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    pp->direct_8x8_inference_flag     = h->sps.direct_8x8_inference_flag;
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    pp->entropy_coding_mode_flag      = h->pps.cabac;
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    pp->pic_order_present_flag        = h->pps.pic_order_present;
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    pp->num_slice_groups_minus1       = h->pps.slice_group_count - 1;
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    pp->slice_group_map_type          = h->pps.mb_slice_group_map_type;
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    pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
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    pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
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    pp->Reserved8BitsB                = 0;
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    pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by FFmpeg */
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    //pp->SliceGroupMap[810];               /* XXX not implemented by FFmpeg */
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}
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static void fill_scaling_lists(const H264Context *h, DXVA_Qmatrix_H264 *qm)
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{
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    unsigned i, j;
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    memset(qm, 0, sizeof(*qm));
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    for (i = 0; i < 6; i++)
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        for (j = 0; j < 16; j++)
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            qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
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    for (i = 0; i < 2; i++)
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        for (j = 0; j < 64; j++)
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            qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][ff_zigzag_direct[j]];
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}
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static int is_slice_short(struct dxva_context *ctx)
167
{
168
    assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
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           ctx->cfg->ConfigBitstreamRaw == 2);
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    return ctx->cfg->ConfigBitstreamRaw == 2;
171
}
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static void fill_slice_short(DXVA_Slice_H264_Short *slice,
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                             unsigned position, unsigned size)
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{
176
    memset(slice, 0, sizeof(*slice));
177
    slice->BSNALunitDataLocation = position;
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    slice->SliceBytesInBuffer    = size;
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    slice->wBadSliceChopping     = 0;
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}
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static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
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                            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;
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190
    memset(slice, 0, sizeof(*slice));
191
    slice->BSNALunitDataLocation = position;
192
    slice->SliceBytesInBuffer    = size;
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    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 */
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    slice->BitOffsetToSliceData  = get_bits_count(&s->gb);
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
}
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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 ff_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