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  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 "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->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.                                               (void **)&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 dxva2_mpeg2_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->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 dxva2_mpeg2_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->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 dxva2_mpeg2_end_frame(AVCodecContext *avctx)
  250. {
  251.     struct MpegEncContext *s = avctx->priv_data;
  252.     struct dxva2_picture_context *ctx_pic =
  253.         s->current_picture_ptr->hwaccel_picture_private;
  254.     int ret;
  255.  
  256.     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
  257.         return -1;
  258.     ret = ff_dxva2_common_end_frame(avctx, s->current_picture_ptr,
  259.                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
  260.                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
  261.                                     commit_bitstream_and_slice_buffer);
  262.     if (!ret)
  263.         ff_mpeg_draw_horiz_band(s, 0, avctx->height);
  264.     return ret;
  265. }
  266.  
  267. AVHWAccel ff_mpeg2_dxva2_hwaccel = {
  268.     .name           = "mpeg2_dxva2",
  269.     .type           = AVMEDIA_TYPE_VIDEO,
  270.     .id             = AV_CODEC_ID_MPEG2VIDEO,
  271.     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
  272.     .start_frame    = dxva2_mpeg2_start_frame,
  273.     .decode_slice   = dxva2_mpeg2_decode_slice,
  274.     .end_frame      = dxva2_mpeg2_end_frame,
  275.     .priv_data_size = sizeof(struct dxva2_picture_context),
  276. };
  277.