/*
  * DXVA2 WMV3/VC-1 HW acceleration.
  *
  * copyright (c) 2010 Laurent Aimar
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "dxva2_internal.h"
 #include "vc1.h"
 #include "vc1data.h"
 
 struct dxva2_picture_context {
     DXVA_PictureParameters pp;
     DXVA_SliceInfo         si;
 
     const uint8_t          *bitstream;
     unsigned               bitstream_size;
 };
 
 static void fill_picture_parameters(AVCodecContext *avctx,
                                     struct dxva_context *ctx, const VC1Context *v,
                                     DXVA_PictureParameters *pp)
 {
     const MpegEncContext *s = &v->s;
     const Picture *current_picture = s->current_picture_ptr;
 
     memset(pp, 0, sizeof(*pp));
     pp->wDecodedPictureIndex    =
     pp->wDeblockedPictureIndex  = ff_dxva2_get_surface_index(ctx, current_picture);

     if (s->pict_type != AV_PICTURE_TYPE_I && !v->bi_type)

         pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->last_picture);
     else
         pp->wForwardRefPictureIndex = 0xffff;

     if (s->pict_type == AV_PICTURE_TYPE_B && !v->bi_type)

         pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->next_picture);
     else
         pp->wBackwardRefPictureIndex = 0xffff;
     if (v->profile == PROFILE_ADVANCED) {
         /* It is the cropped width/height -1 of the frame */
         pp->wPicWidthInMBminus1 = avctx->width  - 1;
         pp->wPicHeightInMBminus1= avctx->height - 1;
     } else {
         /* It is the coded width/height in macroblock -1 of the frame */
         pp->wPicWidthInMBminus1 = s->mb_width  - 1;
         pp->wPicHeightInMBminus1= s->mb_height - 1;
     }
     pp->bMacroblockWidthMinus1  = 15;
     pp->bMacroblockHeightMinus1 = 15;
     pp->bBlockWidthMinus1       = 7;
     pp->bBlockHeightMinus1      = 7;
     pp->bBPPminus1              = 7;
     if (s->picture_structure & PICT_TOP_FIELD)
         pp->bPicStructure      |= 0x01;
     if (s->picture_structure & PICT_BOTTOM_FIELD)
         pp->bPicStructure      |= 0x02;

     pp->bSecondField            = v->interlace && v->fcm == ILACE_FIELD && v->second_field;

     pp->bPicIntra               = s->pict_type == AV_PICTURE_TYPE_I || v->bi_type;
     pp->bPicBackwardPrediction  = s->pict_type == AV_PICTURE_TYPE_B && !v->bi_type;

     pp->bBidirectionalAveragingMode = (1                                           << 7) |
                                       ((ctx->cfg->ConfigIntraResidUnsigned != 0)   << 6) |
                                       ((ctx->cfg->ConfigResidDiffAccelerator != 0) << 5) |
                                       ((v->lumscale != 32 || v->lumshift != 0)     << 4) |
                                       ((v->profile == PROFILE_ADVANCED)            << 3);
     pp->bMVprecisionAndChromaRelation = ((v->mv_mode == MV_PMODE_1MV_HPEL_BILIN) << 3) |
                                         (1                                       << 2) |
                                         (0                                       << 1) |
                                         (!s->quarter_sample                          );
     pp->bChromaFormat           = v->chromaformat;
     ctx->report_id++;
     if (ctx->report_id >= (1 << 16))
         ctx->report_id = 1;
     pp->bPicScanFixed           = ctx->report_id >> 8;
     pp->bPicScanMethod          = ctx->report_id & 0xff;
     pp->bPicReadbackRequests    = 0;
     pp->bRcontrol               = v->rnd;
     pp->bPicSpatialResid8       = (v->panscanflag  << 7) |
                                   (v->refdist_flag << 6) |
                                   (s->loop_filter  << 5) |
                                   (v->fastuvmc     << 4) |
                                   (v->extended_mv  << 3) |
                                   (v->dquant       << 1) |
                                   (v->vstransform      );
     pp->bPicOverflowBlocks      = (v->quantizer_mode << 6) |
                                   (v->multires       << 5) |
                                   (s->resync_marker  << 4) |
                                   (v->rangered       << 3) |
                                   (s->max_b_frames       );

     pp->bPicExtrapolation       = (!v->interlace || v->fcm == PROGRESSIVE) ? 1 : 2;

     pp->bPicDeblocked           = ((!pp->bPicBackwardPrediction && v->overlap)        << 6) |
                                   ((v->profile != PROFILE_ADVANCED && v->rangeredfrm) << 5) |

                                   (s->loop_filter                                     << 1);
     pp->bPicDeblockConfined     = (v->postprocflag             << 7) |
                                   (v->broadcast                << 6) |
                                   (v->interlace                << 5) |
                                   (v->tfcntrflag               << 4) |
                                   (v->finterpflag              << 3) |

                                   ((s->pict_type != AV_PICTURE_TYPE_B) << 2) |

                                   (v->psf                      << 1) |
                                   (v->extended_dmv                 );

     if (s->pict_type != AV_PICTURE_TYPE_I)

         pp->bPic4MVallowed      = v->mv_mode == MV_PMODE_MIXED_MV ||
                                   (v->mv_mode == MV_PMODE_INTENSITY_COMP &&
                                    v->mv_mode2 == MV_PMODE_MIXED_MV);
     if (v->profile == PROFILE_ADVANCED)
         pp->bPicOBMC            = (v->range_mapy_flag  << 7) |
                                   (v->range_mapy       << 4) |
                                   (v->range_mapuv_flag << 3) |
                                   (v->range_mapuv          );
     pp->bPicBinPB               = 0;
     pp->bMV_RPS                 = 0;
     pp->bReservedBits           = 0;
     if (s->picture_structure == PICT_FRAME) {
         pp->wBitstreamFcodes        = v->lumscale;
         pp->wBitstreamPCEelements   = v->lumshift;
     } else {
         /* Syntax: (top_field_param << 8) | bottom_field_param */
         pp->wBitstreamFcodes        = (v->lumscale << 8) | v->lumscale;
         pp->wBitstreamPCEelements   = (v->lumshift << 8) | v->lumshift;
     }
     pp->bBitstreamConcealmentNeed   = 0;
     pp->bBitstreamConcealmentMethod = 0;
 }
 
 static void fill_slice(AVCodecContext *avctx, DXVA_SliceInfo *slice,
                        unsigned position, unsigned size)
 {
     const VC1Context *v = avctx->priv_data;
     const MpegEncContext *s = &v->s;
 
     memset(slice, 0, sizeof(*slice));
     slice->wHorizontalPosition = 0;
     slice->wVerticalPosition   = s->mb_y;
     slice->dwSliceBitsInBuffer = 8 * size;
     slice->dwSliceDataLocation = position;
     slice->bStartCodeBitOffset = 0;
     slice->bReservedBits       = 0;
     slice->wMBbitOffset        = get_bits_count(&s->gb);
     slice->wNumberMBsInSlice   = s->mb_width * s->mb_height; /* XXX We assume 1 slice */
     slice->wQuantizerScaleCode = v->pq;
     slice->wBadSliceChopping   = 0;
 }
 
 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
                                              DXVA2_DecodeBufferDesc *bs,
                                              DXVA2_DecodeBufferDesc *sc)
 {
     const VC1Context *v = avctx->priv_data;
     struct dxva_context *ctx = avctx->hwaccel_context;
     const MpegEncContext *s = &v->s;

     struct dxva2_picture_context *ctx_pic = s->current_picture_ptr->f.hwaccel_picture_private;

 
     DXVA_SliceInfo *slice = &ctx_pic->si;
 
     static const uint8_t start_code[] = { 0, 0, 1, 0x0d };

     const unsigned start_code_size = avctx->codec_id == AV_CODEC_ID_VC1 ? sizeof(start_code) : 0;

     const unsigned slice_size = slice->dwSliceBitsInBuffer / 8;
     const unsigned padding = 128 - ((start_code_size + slice_size) & 127);
     const unsigned data_size = start_code_size + slice_size + padding;
 
     uint8_t  *dxva_data;
     unsigned dxva_size;
     int result;
 
     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
                                               DXVA2_BitStreamDateBufferType,

                                               (void **)&dxva_data, &dxva_size)))

         return -1;
 
     result = data_size <= dxva_size ? 0 : -1;
     if (!result) {

         if (start_code_size > 0) {

             memcpy(dxva_data, start_code, start_code_size);

             if (v->second_field)
                 dxva_data[3] = 0x0c;
         }

         memcpy(dxva_data + start_code_size,
                ctx_pic->bitstream + slice->dwSliceDataLocation, slice_size);
         if (padding > 0)
             memset(dxva_data + start_code_size + slice_size, 0, padding);
         slice->dwSliceBitsInBuffer = 8 * data_size;
     }
     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
                                                   DXVA2_BitStreamDateBufferType)))
         return -1;
     if (result)
         return result;
 
     memset(bs, 0, sizeof(*bs));
     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
     bs->DataSize             = data_size;
     bs->NumMBsInBuffer       = s->mb_width * s->mb_height;
     assert((bs->DataSize & 127) == 0);
 
     return ff_dxva2_commit_buffer(avctx, ctx, sc,
                                   DXVA2_SliceControlBufferType,
                                   slice, sizeof(*slice), bs->NumMBsInBuffer);
 }
 
 static int start_frame(AVCodecContext *avctx,
                        av_unused const uint8_t *buffer,
                        av_unused uint32_t size)
 {
     const VC1Context *v = avctx->priv_data;
     struct dxva_context *ctx = avctx->hwaccel_context;

     struct dxva2_picture_context *ctx_pic = v->s.current_picture_ptr->f.hwaccel_picture_private;

 
     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
         return -1;
     assert(ctx_pic);
 
     fill_picture_parameters(avctx, ctx, v, &ctx_pic->pp);
 
     ctx_pic->bitstream_size = 0;
     ctx_pic->bitstream      = NULL;
     return 0;
 }
 
 static int decode_slice(AVCodecContext *avctx,
                         const uint8_t *buffer, uint32_t size)
 {
     const VC1Context *v = avctx->priv_data;
     const Picture *current_picture = v->s.current_picture_ptr;

     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;

 
     if (ctx_pic->bitstream_size > 0)
         return -1;
 

     if (avctx->codec_id == AV_CODEC_ID_VC1 &&

         size >= 4 && IS_MARKER(AV_RB32(buffer))) {
         buffer += 4;
         size   -= 4;
     }
 
     ctx_pic->bitstream_size = size;
     ctx_pic->bitstream      = buffer;
 
     fill_slice(avctx, &ctx_pic->si, 0, size);
     return 0;
 }
 
 static int end_frame(AVCodecContext *avctx)
 {
     VC1Context *v = avctx->priv_data;

     struct dxva2_picture_context *ctx_pic = v->s.current_picture_ptr->f.hwaccel_picture_private;

 
     if (ctx_pic->bitstream_size <= 0)
         return -1;
 
     return ff_dxva2_common_end_frame(avctx, &v->s,
                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
                                      NULL, 0,
                                      commit_bitstream_and_slice_buffer);
 }
 
 #if CONFIG_WMV3_DXVA2_HWACCEL

 AVHWAccel ff_wmv3_dxva2_hwaccel = {

     .name           = "wmv3_dxva2",

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_WMV3,

     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,

     .start_frame    = start_frame,
     .decode_slice   = decode_slice,
     .end_frame      = end_frame,
     .priv_data_size = sizeof(struct dxva2_picture_context),
 };
 #endif
 

 AVHWAccel ff_vc1_dxva2_hwaccel = {

     .name           = "vc1_dxva2",

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_VC1,

     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,

     .start_frame    = start_frame,
     .decode_slice   = decode_slice,
     .end_frame      = end_frame,
     .priv_data_size = sizeof(struct dxva2_picture_context),
 };