libavcodec/dxva2_h264.c
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00001 /*
00002  * DXVA2 H264 HW acceleration.
00003  *
00004  * copyright (c) 2009 Laurent Aimar
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "dxva2_internal.h"
00024 #include "h264.h"
00025 #include "h264data.h"
00026 
00027 struct dxva2_picture_context {
00028     DXVA_PicParams_H264   pp;
00029     DXVA_Qmatrix_H264     qm;
00030     unsigned              slice_count;
00031     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
00032     DXVA_Slice_H264_Long  slice_long[MAX_SLICES];
00033     const uint8_t         *bitstream;
00034     unsigned              bitstream_size;
00035 };
00036 
00037 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
00038                                unsigned index, unsigned flag)
00039 {
00040     assert((index&0x7f) == index && (flag&0x01) == flag);
00041     pic->bPicEntry = index | (flag << 7);
00042 }
00043 
00044 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
00045                                     DXVA_PicParams_H264 *pp)
00046 {
00047     const MpegEncContext *s = &h->s;
00048     const Picture *current_picture = s->current_picture_ptr;
00049     int i, j;
00050 
00051     memset(pp, 0, sizeof(*pp));
00052     /* Configure current picture */
00053     fill_picture_entry(&pp->CurrPic,
00054                        ff_dxva2_get_surface_index(ctx, current_picture),
00055                        s->picture_structure == PICT_BOTTOM_FIELD);
00056     /* Configure the set of references */
00057     pp->UsedForReferenceFlags  = 0;
00058     pp->NonExistingFrameFlags  = 0;
00059     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
00060         const Picture *r;
00061         if (j < h->short_ref_count) {
00062             r = h->short_ref[j++];
00063         } else {
00064             r = NULL;
00065             while (!r && j < h->short_ref_count + 16)
00066                 r = h->long_ref[j++ - h->short_ref_count];
00067         }
00068         if (r) {
00069             fill_picture_entry(&pp->RefFrameList[i],
00070                                ff_dxva2_get_surface_index(ctx, r),
00071                                r->long_ref != 0);
00072 
00073             if ((r->f.reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
00074                 pp->FieldOrderCntList[i][0] = r->field_poc[0];
00075             if ((r->f.reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
00076                 pp->FieldOrderCntList[i][1] = r->field_poc[1];
00077 
00078             pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
00079             if (r->f.reference & PICT_TOP_FIELD)
00080                 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
00081             if (r->f.reference & PICT_BOTTOM_FIELD)
00082                 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
00083         } else {
00084             pp->RefFrameList[i].bPicEntry = 0xff;
00085             pp->FieldOrderCntList[i][0]   = 0;
00086             pp->FieldOrderCntList[i][1]   = 0;
00087             pp->FrameNumList[i]           = 0;
00088         }
00089     }
00090 
00091     pp->wFrameWidthInMbsMinus1        = s->mb_width  - 1;
00092     pp->wFrameHeightInMbsMinus1       = s->mb_height - 1;
00093     pp->num_ref_frames                = h->sps.ref_frame_count;
00094 
00095     pp->wBitFields                    = ((s->picture_structure != PICT_FRAME) <<  0) |
00096                                         (h->sps.mb_aff                        <<  1) |
00097                                         (h->sps.residual_color_transform_flag <<  2) |
00098                                         /* sp_for_switch_flag (not implemented by Libav) */
00099                                         (0                                    <<  3) |
00100                                         (h->sps.chroma_format_idc             <<  4) |
00101                                         ((h->nal_ref_idc != 0)                <<  6) |
00102                                         (h->pps.constrained_intra_pred        <<  7) |
00103                                         (h->pps.weighted_pred                 <<  8) |
00104                                         (h->pps.weighted_bipred_idc           <<  9) |
00105                                         /* MbsConsecutiveFlag */
00106                                         (1                                    << 11) |
00107                                         (h->sps.frame_mbs_only_flag           << 12) |
00108                                         (h->pps.transform_8x8_mode            << 13) |
00109                                         ((h->sps.level_idc >= 31)             << 14) |
00110                                         /* IntraPicFlag (Modified if we detect a non
00111                                          * intra slice in decode_slice) */
00112                                         (1                                    << 15);
00113 
00114     pp->bit_depth_luma_minus8         = h->sps.bit_depth_luma - 8;
00115     pp->bit_depth_chroma_minus8       = h->sps.bit_depth_chroma - 8;
00116     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
00117         pp->Reserved16Bits            = 0;
00118     else
00119         pp->Reserved16Bits            = 3; /* FIXME is there a way to detect the right mode ? */
00120     pp->StatusReportFeedbackNumber    = 1 + ctx->report_id++;
00121     pp->CurrFieldOrderCnt[0] = 0;
00122     if ((s->picture_structure & PICT_TOP_FIELD) &&
00123         current_picture->field_poc[0] != INT_MAX)
00124         pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
00125     pp->CurrFieldOrderCnt[1] = 0;
00126     if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
00127         current_picture->field_poc[1] != INT_MAX)
00128         pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
00129     pp->pic_init_qs_minus26           = h->pps.init_qs - 26;
00130     pp->chroma_qp_index_offset        = h->pps.chroma_qp_index_offset[0];
00131     pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
00132     pp->ContinuationFlag              = 1;
00133     pp->pic_init_qp_minus26           = h->pps.init_qp - 26;
00134     pp->num_ref_idx_l0_active_minus1  = h->pps.ref_count[0] - 1;
00135     pp->num_ref_idx_l1_active_minus1  = h->pps.ref_count[1] - 1;
00136     pp->Reserved8BitsA                = 0;
00137     pp->frame_num                     = h->frame_num;
00138     pp->log2_max_frame_num_minus4     = h->sps.log2_max_frame_num - 4;
00139     pp->pic_order_cnt_type            = h->sps.poc_type;
00140     if (h->sps.poc_type == 0)
00141         pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
00142     else if (h->sps.poc_type == 1)
00143         pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
00144     pp->direct_8x8_inference_flag     = h->sps.direct_8x8_inference_flag;
00145     pp->entropy_coding_mode_flag      = h->pps.cabac;
00146     pp->pic_order_present_flag        = h->pps.pic_order_present;
00147     pp->num_slice_groups_minus1       = h->pps.slice_group_count - 1;
00148     pp->slice_group_map_type          = h->pps.mb_slice_group_map_type;
00149     pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
00150     pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
00151     pp->Reserved8BitsB                = 0;
00152     pp->slice_group_change_rate_minus1= 0;  /* XXX not implemented by Libav */
00153     //pp->SliceGroupMap[810];               /* XXX not implemented by Libav */
00154 }
00155 
00156 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
00157 {
00158     unsigned i, j;
00159     memset(qm, 0, sizeof(*qm));
00160     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
00161         for (i = 0; i < 6; i++)
00162             for (j = 0; j < 16; j++)
00163                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
00164 
00165         for (i = 0; i < 64; i++) {
00166             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
00167             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
00168         }
00169     } else {
00170         for (i = 0; i < 6; i++)
00171             for (j = 0; j < 16; j++)
00172                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
00173 
00174         for (i = 0; i < 64; i++) {
00175             qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
00176             qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
00177         }
00178     }
00179 }
00180 
00181 static int is_slice_short(struct dxva_context *ctx)
00182 {
00183     assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
00184            ctx->cfg->ConfigBitstreamRaw == 2);
00185     return ctx->cfg->ConfigBitstreamRaw == 2;
00186 }
00187 
00188 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
00189                              unsigned position, unsigned size)
00190 {
00191     memset(slice, 0, sizeof(*slice));
00192     slice->BSNALunitDataLocation = position;
00193     slice->SliceBytesInBuffer    = size;
00194     slice->wBadSliceChopping     = 0;
00195 }
00196 
00197 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
00198                             unsigned position, unsigned size)
00199 {
00200     const H264Context *h = avctx->priv_data;
00201     struct dxva_context *ctx = avctx->hwaccel_context;
00202     const MpegEncContext *s = &h->s;
00203     unsigned list;
00204 
00205     memset(slice, 0, sizeof(*slice));
00206     slice->BSNALunitDataLocation = position;
00207     slice->SliceBytesInBuffer    = size;
00208     slice->wBadSliceChopping     = 0;
00209 
00210     slice->first_mb_in_slice     = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
00211     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
00212     slice->BitOffsetToSliceData  = get_bits_count(&s->gb);
00213     slice->slice_type            = ff_h264_get_slice_type(h);
00214     if (h->slice_type_fixed)
00215         slice->slice_type += 5;
00216     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
00217     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
00218     if (h->list_count > 0)
00219         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
00220     if (h->list_count > 1)
00221         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
00222     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
00223     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
00224     slice->Reserved8Bits                = 0;
00225 
00226     for (list = 0; list < 2; list++) {
00227         unsigned i;
00228         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
00229             if (list < h->list_count && i < h->ref_count[list]) {
00230                 const Picture *r = &h->ref_list[list][i];
00231                 unsigned plane;
00232                 fill_picture_entry(&slice->RefPicList[list][i],
00233                                    ff_dxva2_get_surface_index(ctx, r),
00234                                    r->f.reference == PICT_BOTTOM_FIELD);
00235                 for (plane = 0; plane < 3; plane++) {
00236                     int w, o;
00237                     if (plane == 0 && h->luma_weight_flag[list]) {
00238                         w = h->luma_weight[i][list][0];
00239                         o = h->luma_weight[i][list][1];
00240                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
00241                         w = h->chroma_weight[i][list][plane-1][0];
00242                         o = h->chroma_weight[i][list][plane-1][1];
00243                     } else {
00244                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
00245                                                h->chroma_log2_weight_denom);
00246                         o = 0;
00247                     }
00248                     slice->Weights[list][i][plane][0] = w;
00249                     slice->Weights[list][i][plane][1] = o;
00250                 }
00251             } else {
00252                 unsigned plane;
00253                 slice->RefPicList[list][i].bPicEntry = 0xff;
00254                 for (plane = 0; plane < 3; plane++) {
00255                     slice->Weights[list][i][plane][0] = 0;
00256                     slice->Weights[list][i][plane][1] = 0;
00257                 }
00258             }
00259         }
00260     }
00261     slice->slice_qs_delta    = 0; /* XXX not implemented by Libav */
00262     slice->slice_qp_delta    = s->qscale - h->pps.init_qp;
00263     slice->redundant_pic_cnt = h->redundant_pic_count;
00264     if (h->slice_type == AV_PICTURE_TYPE_B)
00265         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
00266     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
00267     if (h->deblocking_filter < 2)
00268         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
00269     else
00270         slice->disable_deblocking_filter_idc = h->deblocking_filter;
00271     slice->slice_id = h->current_slice - 1;
00272 }
00273 
00274 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
00275                                              DXVA2_DecodeBufferDesc *bs,
00276                                              DXVA2_DecodeBufferDesc *sc)
00277 {
00278     const H264Context *h = avctx->priv_data;
00279     const MpegEncContext *s = &h->s;
00280     const unsigned mb_count = s->mb_width * s->mb_height;
00281     struct dxva_context *ctx = avctx->hwaccel_context;
00282     const Picture *current_picture = h->s.current_picture_ptr;
00283     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
00284     DXVA_Slice_H264_Short *slice = NULL;
00285     uint8_t  *dxva_data, *current, *end;
00286     unsigned dxva_size;
00287     void     *slice_data;
00288     unsigned slice_size;
00289     unsigned padding;
00290     unsigned i;
00291 
00292     /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
00293     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
00294                                                DXVA2_BitStreamDateBufferType,
00295                                                &dxva_data, &dxva_size)))
00296         return -1;
00297     current = dxva_data;
00298     end = dxva_data + dxva_size;
00299 
00300     for (i = 0; i < ctx_pic->slice_count; i++) {
00301         static const uint8_t start_code[] = { 0, 0, 1 };
00302         static const unsigned start_code_size = sizeof(start_code);
00303         unsigned position, size;
00304 
00305         assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
00306                offsetof(DXVA_Slice_H264_Long,  BSNALunitDataLocation));
00307         assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
00308                offsetof(DXVA_Slice_H264_Long,  SliceBytesInBuffer));
00309 
00310         if (is_slice_short(ctx))
00311             slice = &ctx_pic->slice_short[i];
00312         else
00313             slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
00314 
00315         position = slice->BSNALunitDataLocation;
00316         size     = slice->SliceBytesInBuffer;
00317         if (start_code_size + size > end - current) {
00318             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
00319             break;
00320         }
00321 
00322         slice->BSNALunitDataLocation = current - dxva_data;
00323         slice->SliceBytesInBuffer    = start_code_size + size;
00324 
00325         if (!is_slice_short(ctx)) {
00326             DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
00327             if (i < ctx_pic->slice_count - 1)
00328                 slice_long->NumMbsForSlice =
00329                     slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
00330             else
00331                 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
00332         }
00333 
00334         memcpy(current, start_code, start_code_size);
00335         current += start_code_size;
00336 
00337         memcpy(current, &ctx_pic->bitstream[position], size);
00338         current += size;
00339     }
00340     padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
00341     if (slice && padding > 0) {
00342         memset(current, 0, padding);
00343         current += padding;
00344 
00345         slice->SliceBytesInBuffer += padding;
00346     }
00347     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
00348                                                   DXVA2_BitStreamDateBufferType)))
00349         return -1;
00350     if (i < ctx_pic->slice_count)
00351         return -1;
00352 
00353     memset(bs, 0, sizeof(*bs));
00354     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
00355     bs->DataSize             = current - dxva_data;
00356     bs->NumMBsInBuffer       = mb_count;
00357 
00358     if (is_slice_short(ctx)) {
00359         slice_data = ctx_pic->slice_short;
00360         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
00361     } else {
00362         slice_data = ctx_pic->slice_long;
00363         slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
00364     }
00365     assert((bs->DataSize & 127) == 0);
00366     return ff_dxva2_commit_buffer(avctx, ctx, sc,
00367                                   DXVA2_SliceControlBufferType,
00368                                   slice_data, slice_size, mb_count);
00369 }
00370 
00371 
00372 static int start_frame(AVCodecContext *avctx,
00373                        av_unused const uint8_t *buffer,
00374                        av_unused uint32_t size)
00375 {
00376     const H264Context *h = avctx->priv_data;
00377     struct dxva_context *ctx = avctx->hwaccel_context;
00378     struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->f.hwaccel_picture_private;
00379 
00380     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
00381         return -1;
00382     assert(ctx_pic);
00383 
00384     /* Fill up DXVA_PicParams_H264 */
00385     fill_picture_parameters(ctx, h, &ctx_pic->pp);
00386 
00387     /* Fill up DXVA_Qmatrix_H264 */
00388     fill_scaling_lists(ctx, h, &ctx_pic->qm);
00389 
00390     ctx_pic->slice_count    = 0;
00391     ctx_pic->bitstream_size = 0;
00392     ctx_pic->bitstream      = NULL;
00393     return 0;
00394 }
00395 
00396 static int decode_slice(AVCodecContext *avctx,
00397                         const uint8_t *buffer, uint32_t size)
00398 {
00399     const H264Context *h = avctx->priv_data;
00400     struct dxva_context *ctx = avctx->hwaccel_context;
00401     const Picture *current_picture = h->s.current_picture_ptr;
00402     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
00403     unsigned position;
00404 
00405     if (ctx_pic->slice_count >= MAX_SLICES)
00406         return -1;
00407 
00408     if (!ctx_pic->bitstream)
00409         ctx_pic->bitstream = buffer;
00410     ctx_pic->bitstream_size += size;
00411 
00412     position = buffer - ctx_pic->bitstream;
00413     if (is_slice_short(ctx))
00414         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
00415                          position, size);
00416     else
00417         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
00418                         position, size);
00419     ctx_pic->slice_count++;
00420 
00421     if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
00422         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
00423     return 0;
00424 }
00425 
00426 static int end_frame(AVCodecContext *avctx)
00427 {
00428     H264Context *h = avctx->priv_data;
00429     MpegEncContext *s = &h->s;
00430     struct dxva2_picture_context *ctx_pic =
00431         h->s.current_picture_ptr->f.hwaccel_picture_private;
00432 
00433     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
00434         return -1;
00435     return ff_dxva2_common_end_frame(avctx, s,
00436                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
00437                                      &ctx_pic->qm, sizeof(ctx_pic->qm),
00438                                      commit_bitstream_and_slice_buffer);
00439 }
00440 
00441 AVHWAccel ff_h264_dxva2_hwaccel = {
00442     .name           = "h264_dxva2",
00443     .type           = AVMEDIA_TYPE_VIDEO,
00444     .id             = CODEC_ID_H264,
00445     .pix_fmt        = PIX_FMT_DXVA2_VLD,
00446     .start_frame    = start_frame,
00447     .decode_slice   = decode_slice,
00448     .end_frame      = end_frame,
00449     .priv_data_size = sizeof(struct dxva2_picture_context),
00450 };
00451