git.sesse.net Git - ffmpeg/blob - libavcodec/dxva2_mpeg2.c

   1 /*
   2  * MPEG-2 HW acceleration.
   3  *
   4  * copyright (c) 2010 Laurent Aimar
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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
  25 #define MAX_SLICES (SLICE_MAX_START_CODE - SLICE_MIN_START_CODE + 1)
  26 struct dxva2_picture_context {
  27     DXVA_PictureParameters pp;
  28     DXVA_QmatrixData       qm;
  29     unsigned               slice_count;
  30     DXVA_SliceInfo         slice[MAX_SLICES];
  31
  32     const uint8_t          *bitstream;
  33     unsigned               bitstream_size;
  34 };
  35
  36 static void fill_picture_parameters(AVCodecContext *avctx,
  37                                     struct dxva_context *ctx,
  38                                     const struct MpegEncContext *s,
  39                                     DXVA_PictureParameters *pp)
  40 {
  41     const Picture *current_picture = s->current_picture_ptr;
  42     int is_field = s->picture_structure != PICT_FRAME;
  43
  44     memset(pp, 0, sizeof(*pp));
  45     pp->wDecodedPictureIndex         = ff_dxva2_get_surface_index(ctx, current_picture);
  46     pp->wDeblockedPictureIndex       = 0;
  47     if (s->pict_type != AV_PICTURE_TYPE_I)
  48         pp->wForwardRefPictureIndex  = ff_dxva2_get_surface_index(ctx, &s->last_picture);
  49     else
  50         pp->wForwardRefPictureIndex  = 0xffff;
  51     if (s->pict_type == AV_PICTURE_TYPE_B)
  52         pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->next_picture);
  53     else
  54         pp->wBackwardRefPictureIndex = 0xffff;
  55     pp->wPicWidthInMBminus1          = s->mb_width  - 1;
  56     pp->wPicHeightInMBminus1         = (s->mb_height >> is_field) - 1;
  57     pp->bMacroblockWidthMinus1       = 15;
  58     pp->bMacroblockHeightMinus1      = 15;
  59     pp->bBlockWidthMinus1            = 7;
  60     pp->bBlockHeightMinus1           = 7;
  61     pp->bBPPminus1                   = 7;
  62     pp->bPicStructure                = s->picture_structure;
  63     pp->bSecondField                 = is_field && !s->first_field;
  64     pp->bPicIntra                    = s->pict_type == AV_PICTURE_TYPE_I;
  65     pp->bPicBackwardPrediction       = s->pict_type == AV_PICTURE_TYPE_B;
  66     pp->bBidirectionalAveragingMode  = 0;
  67     pp->bMVprecisionAndChromaRelation= 0; /* FIXME */
  68     pp->bChromaFormat                = s->chroma_format;
  69     pp->bPicScanFixed                = 1;
  70     pp->bPicScanMethod               = s->alternate_scan ? 1 : 0;
  71     pp->bPicReadbackRequests         = 0;
  72     pp->bRcontrol                    = 0;
  73     pp->bPicSpatialResid8            = 0;
  74     pp->bPicOverflowBlocks           = 0;
  75     pp->bPicExtrapolation            = 0;
  76     pp->bPicDeblocked                = 0;
  77     pp->bPicDeblockConfined          = 0;
  78     pp->bPic4MVallowed               = 0;
  79     pp->bPicOBMC                     = 0;
  80     pp->bPicBinPB                    = 0;
  81     pp->bMV_RPS                      = 0;
  82     pp->bReservedBits                = 0;
  83     pp->wBitstreamFcodes             = (s->mpeg_f_code[0][0] << 12) |
  84                                        (s->mpeg_f_code[0][1] <<  8) |
  85                                        (s->mpeg_f_code[1][0] <<  4) |
  86                                        (s->mpeg_f_code[1][1]      );
  87     pp->wBitstreamPCEelements        = (s->intra_dc_precision         << 14) |
  88                                        (s->picture_structure          << 12) |
  89                                        (s->top_field_first            << 11) |
  90                                        (s->frame_pred_frame_dct       << 10) |
  91                                        (s->concealment_motion_vectors <<  9) |
  92                                        (s->q_scale_type               <<  8) |
  93                                        (s->intra_vlc_format           <<  7) |
  94                                        (s->alternate_scan             <<  6) |
  95                                        (s->repeat_first_field         <<  5) |
  96                                        (s->chroma_420_type            <<  4) |
  97                                        (s->progressive_frame          <<  3);
  98     pp->bBitstreamConcealmentNeed    = 0;
  99     pp->bBitstreamConcealmentMethod  = 0;
 100 }
 101
 102 static void fill_quantization_matrices(AVCodecContext *avctx,
 103                                        struct dxva_context *ctx,
 104                                        const struct MpegEncContext *s,
 105                                        DXVA_QmatrixData *qm)
 106 {
 107     int i;
 108     for (i = 0; i < 4; i++)
 109         qm->bNewQmatrix[i] = 1;
 110     for (i = 0; i < 64; i++) {
 111         int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
 112         qm->Qmatrix[0][i] = s->intra_matrix[n];;
 113         qm->Qmatrix[1][i] = s->inter_matrix[n];;
 114         qm->Qmatrix[2][i] = s->chroma_intra_matrix[n];;
 115         qm->Qmatrix[3][i] = s->chroma_inter_matrix[n];;
 116     }
 117 }
 118
 119 static void fill_slice(AVCodecContext *avctx,
 120                        const struct MpegEncContext *s,
 121                        DXVA_SliceInfo *slice,
 122                        unsigned position,
 123                        const uint8_t *buffer, unsigned size)
 124 {
 125     int is_field = s->picture_structure != PICT_FRAME;
 126     GetBitContext gb;
 127
 128     memset(slice, 0, sizeof(*slice));
 129     slice->wHorizontalPosition = s->mb_x;
 130     slice->wVerticalPosition   = s->mb_y >> is_field;
 131     slice->dwSliceBitsInBuffer = 8 * size;
 132     slice->dwSliceDataLocation = position;
 133     slice->bStartCodeBitOffset = 0;
 134     slice->bReservedBits       = 0;
 135     /* XXX We store the index of the first MB and it will be fixed later */
 136     slice->wNumberMBsInSlice   = (s->mb_y >> is_field) * s->mb_width + s->mb_x;
 137     slice->wBadSliceChopping   = 0;
 138
 139     init_get_bits(&gb, &buffer[4], 8 * (size - 4));
 140
 141     slice->wQuantizerScaleCode = get_bits(&gb, 5);
 142     while (get_bits1(&gb))
 143         skip_bits(&gb, 8);
 144
 145     slice->wMBbitOffset        = 4 * 8 + get_bits_count(&gb);
 146 }
 147 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 148                                              DXVA2_DecodeBufferDesc *bs,
 149                                              DXVA2_DecodeBufferDesc *sc)
 150 {
 151     const struct MpegEncContext *s = avctx->priv_data;
 152     struct dxva_context *ctx = avctx->hwaccel_context;
 153     struct dxva2_picture_context *ctx_pic =
 154         s->current_picture_ptr->f.hwaccel_picture_private;
 155     const int is_field = s->picture_structure != PICT_FRAME;
 156     const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
 157     uint8_t  *dxva_data, *current, *end;
 158     unsigned dxva_size;
 159     unsigned i;
 160
 161     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 162                                               DXVA2_BitStreamDateBufferType,
 163                                               &dxva_data, &dxva_size)))
 164         return -1;
 165     current = dxva_data;
 166     end = dxva_data + dxva_size;
 167
 168     for (i = 0; i < ctx_pic->slice_count; i++) {
 169         DXVA_SliceInfo *slice = &ctx_pic->slice[i];
 170         unsigned position = slice->dwSliceDataLocation;
 171         unsigned size     = slice->dwSliceBitsInBuffer / 8;
 172         if (size > end - current) {
 173             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 174             break;
 175         }
 176         slice->dwSliceDataLocation = current - dxva_data;
 177
 178         if (i < ctx_pic->slice_count - 1)
 179             slice->wNumberMBsInSlice =
 180                 slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
 181         else
 182             slice->wNumberMBsInSlice =
 183                 mb_count - slice[0].wNumberMBsInSlice;
 184
 185         memcpy(current, &ctx_pic->bitstream[position], size);
 186         current += size;
 187     }
 188     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 189                                                   DXVA2_BitStreamDateBufferType)))
 190         return -1;
 191     if (i < ctx_pic->slice_count)
 192         return -1;
 193
 194     memset(bs, 0, sizeof(*bs));
 195     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 196     bs->DataSize             = current - dxva_data;
 197     bs->NumMBsInBuffer       = mb_count;
 198
 199     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 200                                   DXVA2_SliceControlBufferType,
 201                                   ctx_pic->slice,
 202                                   ctx_pic->slice_count * sizeof(*ctx_pic->slice),
 203                                   mb_count);
 204 }
 205
 206 static int start_frame(AVCodecContext *avctx,
 207                        av_unused const uint8_t *buffer,
 208                        av_unused uint32_t size)
 209 {
 210     const struct MpegEncContext *s = avctx->priv_data;
 211     struct dxva_context *ctx = avctx->hwaccel_context;
 212     struct dxva2_picture_context *ctx_pic =
 213         s->current_picture_ptr->f.hwaccel_picture_private;
 214
 215     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 216         return -1;
 217     assert(ctx_pic);
 218
 219     fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
 220     fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
 221
 222     ctx_pic->slice_count    = 0;
 223     ctx_pic->bitstream_size = 0;
 224     ctx_pic->bitstream      = NULL;
 225     return 0;
 226 }
 227
 228 static int decode_slice(AVCodecContext *avctx,
 229                         const uint8_t *buffer, uint32_t size)
 230 {
 231     const struct MpegEncContext *s = avctx->priv_data;
 232     struct dxva2_picture_context *ctx_pic =
 233         s->current_picture_ptr->f.hwaccel_picture_private;
 234     unsigned position;
 235
 236     if (ctx_pic->slice_count >= MAX_SLICES)
 237         return -1;
 238
 239     if (!ctx_pic->bitstream)
 240         ctx_pic->bitstream = buffer;
 241     ctx_pic->bitstream_size += size;
 242
 243     position = buffer - ctx_pic->bitstream;
 244     fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
 245                buffer, size);
 246     return 0;
 247 }
 248
 249 static int end_frame(AVCodecContext *avctx)
 250 {
 251     struct MpegEncContext *s = avctx->priv_data;
 252     struct dxva2_picture_context *ctx_pic =
 253         s->current_picture_ptr->f.hwaccel_picture_private;
 254
 255     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 256         return -1;
 257     return ff_dxva2_common_end_frame(avctx, s,
 258                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
 259                                      &ctx_pic->qm, sizeof(ctx_pic->qm),
 260                                      commit_bitstream_and_slice_buffer);
 261 }
 262
 263 AVHWAccel ff_mpeg2_dxva2_hwaccel = {
 264     .name           = "mpeg2_dxva2",
 265     .type           = AVMEDIA_TYPE_VIDEO,
 266     .id             = AV_CODEC_ID_MPEG2VIDEO,
 267     .pix_fmt        = PIX_FMT_DXVA2_VLD,
 268     .start_frame    = start_frame,
 269     .decode_slice   = decode_slice,
 270     .end_frame      = end_frame,
 271     .priv_data_size = sizeof(struct dxva2_picture_context),
 272 };