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 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 "libavutil/log.h"
  24 #include "dxva2_internal.h"
  25 #include "mpegutils.h"
  26
  27 #define MAX_SLICES 1024
  28 struct dxva2_picture_context {
  29     DXVA_PictureParameters pp;
  30     DXVA_QmatrixData       qm;
  31     unsigned               slice_count;
  32     DXVA_SliceInfo         slice[MAX_SLICES];
  33
  34     const uint8_t          *bitstream;
  35     unsigned               bitstream_size;
  36 };
  37
  38 static void fill_picture_parameters(AVCodecContext *avctx,
  39                                     struct dxva_context *ctx,
  40                                     const struct MpegEncContext *s,
  41                                     DXVA_PictureParameters *pp)
  42 {
  43     const Picture *current_picture = s->current_picture_ptr;
  44     int is_field = s->picture_structure != PICT_FRAME;
  45
  46     memset(pp, 0, sizeof(*pp));
  47     pp->wDecodedPictureIndex         = ff_dxva2_get_surface_index(ctx, current_picture->f);
  48     pp->wDeblockedPictureIndex       = 0;
  49     if (s->pict_type != AV_PICTURE_TYPE_I)
  50         pp->wForwardRefPictureIndex  = ff_dxva2_get_surface_index(ctx, s->last_picture.f);
  51     else
  52         pp->wForwardRefPictureIndex  = 0xffff;
  53     if (s->pict_type == AV_PICTURE_TYPE_B)
  54         pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, s->next_picture.f);
  55     else
  56         pp->wBackwardRefPictureIndex = 0xffff;
  57     pp->wPicWidthInMBminus1          = s->mb_width  - 1;
  58     pp->wPicHeightInMBminus1         = (s->mb_height >> is_field) - 1;
  59     pp->bMacroblockWidthMinus1       = 15;
  60     pp->bMacroblockHeightMinus1      = 15;
  61     pp->bBlockWidthMinus1            = 7;
  62     pp->bBlockHeightMinus1           = 7;
  63     pp->bBPPminus1                   = 7;
  64     pp->bPicStructure                = s->picture_structure;
  65     pp->bSecondField                 = is_field && !s->first_field;
  66     pp->bPicIntra                    = s->pict_type == AV_PICTURE_TYPE_I;
  67     pp->bPicBackwardPrediction       = s->pict_type == AV_PICTURE_TYPE_B;
  68     pp->bBidirectionalAveragingMode  = 0;
  69     pp->bMVprecisionAndChromaRelation= 0; /* FIXME */
  70     pp->bChromaFormat                = s->chroma_format;
  71     pp->bPicScanFixed                = 1;
  72     pp->bPicScanMethod               = s->alternate_scan ? 1 : 0;
  73     pp->bPicReadbackRequests         = 0;
  74     pp->bRcontrol                    = 0;
  75     pp->bPicSpatialResid8            = 0;
  76     pp->bPicOverflowBlocks           = 0;
  77     pp->bPicExtrapolation            = 0;
  78     pp->bPicDeblocked                = 0;
  79     pp->bPicDeblockConfined          = 0;
  80     pp->bPic4MVallowed               = 0;
  81     pp->bPicOBMC                     = 0;
  82     pp->bPicBinPB                    = 0;
  83     pp->bMV_RPS                      = 0;
  84     pp->bReservedBits                = 0;
  85     pp->wBitstreamFcodes             = (s->mpeg_f_code[0][0] << 12) |
  86                                        (s->mpeg_f_code[0][1] <<  8) |
  87                                        (s->mpeg_f_code[1][0] <<  4) |
  88                                        (s->mpeg_f_code[1][1]      );
  89     pp->wBitstreamPCEelements        = (s->intra_dc_precision         << 14) |
  90                                        (s->picture_structure          << 12) |
  91                                        (s->top_field_first            << 11) |
  92                                        (s->frame_pred_frame_dct       << 10) |
  93                                        (s->concealment_motion_vectors <<  9) |
  94                                        (s->q_scale_type               <<  8) |
  95                                        (s->intra_vlc_format           <<  7) |
  96                                        (s->alternate_scan             <<  6) |
  97                                        (s->repeat_first_field         <<  5) |
  98                                        (s->chroma_420_type            <<  4) |
  99                                        (s->progressive_frame          <<  3);
 100     pp->bBitstreamConcealmentNeed    = 0;
 101     pp->bBitstreamConcealmentMethod  = 0;
 102 }
 103
 104 static void fill_quantization_matrices(AVCodecContext *avctx,
 105                                        struct dxva_context *ctx,
 106                                        const struct MpegEncContext *s,
 107                                        DXVA_QmatrixData *qm)
 108 {
 109     int i;
 110     for (i = 0; i < 4; i++)
 111         qm->bNewQmatrix[i] = 1;
 112     for (i = 0; i < 64; i++) {
 113         int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
 114         qm->Qmatrix[0][i] = s->intra_matrix[n];
 115         qm->Qmatrix[1][i] = s->inter_matrix[n];
 116         qm->Qmatrix[2][i] = s->chroma_intra_matrix[n];
 117         qm->Qmatrix[3][i] = s->chroma_inter_matrix[n];
 118     }
 119 }
 120
 121 static void fill_slice(AVCodecContext *avctx,
 122                        const struct MpegEncContext *s,
 123                        DXVA_SliceInfo *slice,
 124                        unsigned position,
 125                        const uint8_t *buffer, unsigned size)
 126 {
 127     int is_field = s->picture_structure != PICT_FRAME;
 128     GetBitContext gb;
 129
 130     memset(slice, 0, sizeof(*slice));
 131     slice->wHorizontalPosition = s->mb_x;
 132     slice->wVerticalPosition   = s->mb_y >> is_field;
 133     slice->dwSliceBitsInBuffer = 8 * size;
 134     slice->dwSliceDataLocation = position;
 135     slice->bStartCodeBitOffset = 0;
 136     slice->bReservedBits       = 0;
 137     /* XXX We store the index of the first MB and it will be fixed later */
 138     slice->wNumberMBsInSlice   = (s->mb_y >> is_field) * s->mb_width + s->mb_x;
 139     slice->wBadSliceChopping   = 0;
 140
 141     init_get_bits(&gb, &buffer[4], 8 * (size - 4));
 142
 143     slice->wQuantizerScaleCode = get_bits(&gb, 5);
 144     skip_1stop_8data_bits(&gb);
 145
 146     slice->wMBbitOffset        = 4 * 8 + get_bits_count(&gb);
 147 }
 148 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
 149                                              DXVA2_DecodeBufferDesc *bs,
 150                                              DXVA2_DecodeBufferDesc *sc)
 151 {
 152     const struct MpegEncContext *s = avctx->priv_data;
 153     struct dxva_context *ctx = avctx->hwaccel_context;
 154     struct dxva2_picture_context *ctx_pic =
 155         s->current_picture_ptr->hwaccel_picture_private;
 156     const int is_field = s->picture_structure != PICT_FRAME;
 157     const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
 158     uint8_t  *dxva_data, *current, *end;
 159     unsigned dxva_size;
 160     unsigned i;
 161
 162     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
 163                                               DXVA2_BitStreamDateBufferType,
 164                                               (void **)&dxva_data, &dxva_size)))
 165         return -1;
 166     current = dxva_data;
 167     end = dxva_data + dxva_size;
 168
 169     for (i = 0; i < ctx_pic->slice_count; i++) {
 170         DXVA_SliceInfo *slice = &ctx_pic->slice[i];
 171         unsigned position = slice->dwSliceDataLocation;
 172         unsigned size     = slice->dwSliceBitsInBuffer / 8;
 173         if (size > end - current) {
 174             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
 175             break;
 176         }
 177         slice->dwSliceDataLocation = current - dxva_data;
 178
 179         if (i < ctx_pic->slice_count - 1)
 180             slice->wNumberMBsInSlice =
 181                 slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
 182         else
 183             slice->wNumberMBsInSlice =
 184                 mb_count - slice[0].wNumberMBsInSlice;
 185
 186         memcpy(current, &ctx_pic->bitstream[position], size);
 187         current += size;
 188     }
 189     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
 190                                                   DXVA2_BitStreamDateBufferType)))
 191         return -1;
 192     if (i < ctx_pic->slice_count)
 193         return -1;
 194
 195     memset(bs, 0, sizeof(*bs));
 196     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
 197     bs->DataSize             = current - dxva_data;
 198     bs->NumMBsInBuffer       = mb_count;
 199
 200     return ff_dxva2_commit_buffer(avctx, ctx, sc,
 201                                   DXVA2_SliceControlBufferType,
 202                                   ctx_pic->slice,
 203                                   ctx_pic->slice_count * sizeof(*ctx_pic->slice),
 204                                   mb_count);
 205 }
 206
 207 static int dxva2_mpeg2_start_frame(AVCodecContext *avctx,
 208                                    av_unused const uint8_t *buffer,
 209                                    av_unused uint32_t size)
 210 {
 211     const struct MpegEncContext *s = avctx->priv_data;
 212     struct dxva_context *ctx = avctx->hwaccel_context;
 213     struct dxva2_picture_context *ctx_pic =
 214         s->current_picture_ptr->hwaccel_picture_private;
 215
 216     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
 217         return -1;
 218     assert(ctx_pic);
 219
 220     fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
 221     fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
 222
 223     ctx_pic->slice_count    = 0;
 224     ctx_pic->bitstream_size = 0;
 225     ctx_pic->bitstream      = NULL;
 226     return 0;
 227 }
 228
 229 static int dxva2_mpeg2_decode_slice(AVCodecContext *avctx,
 230                                     const uint8_t *buffer, uint32_t size)
 231 {
 232     const struct MpegEncContext *s = avctx->priv_data;
 233     struct dxva2_picture_context *ctx_pic =
 234         s->current_picture_ptr->hwaccel_picture_private;
 235     unsigned position;
 236
 237     if (ctx_pic->slice_count >= MAX_SLICES) {
 238         avpriv_request_sample(avctx, "%d slices in dxva2",
 239                               ctx_pic->slice_count);
 240         return -1;
 241     }
 242     if (!ctx_pic->bitstream)
 243         ctx_pic->bitstream = buffer;
 244     ctx_pic->bitstream_size += size;
 245
 246     position = buffer - ctx_pic->bitstream;
 247     fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
 248                buffer, size);
 249     return 0;
 250 }
 251
 252 static int dxva2_mpeg2_end_frame(AVCodecContext *avctx)
 253 {
 254     struct MpegEncContext *s = avctx->priv_data;
 255     struct dxva2_picture_context *ctx_pic =
 256         s->current_picture_ptr->hwaccel_picture_private;
 257     int ret;
 258
 259     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
 260         return -1;
 261     ret = ff_dxva2_common_end_frame(avctx, s->current_picture_ptr->f,
 262                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
 263                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
 264                                     commit_bitstream_and_slice_buffer);
 265     if (!ret)
 266         ff_mpeg_draw_horiz_band(s, 0, avctx->height);
 267     return ret;
 268 }
 269
 270 AVHWAccel ff_mpeg2_dxva2_hwaccel = {
 271     .name           = "mpeg2_dxva2",
 272     .type           = AVMEDIA_TYPE_VIDEO,
 273     .id             = AV_CODEC_ID_MPEG2VIDEO,
 274     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
 275     .start_frame    = dxva2_mpeg2_start_frame,
 276     .decode_slice   = dxva2_mpeg2_decode_slice,
 277     .end_frame      = dxva2_mpeg2_end_frame,
 278     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
 279 };