void ff_xvmc_decode_mb(MpegEncContext *s) { XvMCMacroBlock *mv_block; struct xvmc_pix_fmt *render; int i, cbp, blocks_per_mb; const int mb_xy = s->mb_y * s->mb_stride + s->mb_x; if (s->encoding) { av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n"); return; } // from ff_mpv_decode_mb(), update DC predictors for P macroblocks if (!s->mb_intra) { s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 128 << s->intra_dc_precision; } // MC doesn't skip blocks s->mb_skipped = 0; // Do I need to export quant when I could not perform postprocessing? // Anyway, it doesn't hurt. s->current_picture.qscale_table[mb_xy] = s->qscale; // start of XVMC-specific code render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2]; assert(render); assert(render->xvmc_id == AV_XVMC_ID); assert(render->mv_blocks); // take the next free macroblock mv_block = &render->mv_blocks[render->start_mv_blocks_num + render->filled_mv_blocks_num]; mv_block->x = s->mb_x; mv_block->y = s->mb_y; mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD; if (s->mb_intra) { mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done } else { mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN; if (s->mv_dir & MV_DIR_FORWARD) { mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD; // PMV[n][dir][xy] = mv[dir][n][xy] mv_block->PMV[0][0][0] = s->mv[0][0][0]; mv_block->PMV[0][0][1] = s->mv[0][0][1]; mv_block->PMV[1][0][0] = s->mv[0][1][0]; mv_block->PMV[1][0][1] = s->mv[0][1][1]; } if (s->mv_dir & MV_DIR_BACKWARD) { mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD; mv_block->PMV[0][1][0] = s->mv[1][0][0]; mv_block->PMV[0][1][1] = s->mv[1][0][1]; mv_block->PMV[1][1][0] = s->mv[1][1][0]; mv_block->PMV[1][1][1] = s->mv[1][1][1]; } switch(s->mv_type) { case MV_TYPE_16X16: mv_block->motion_type = XVMC_PREDICTION_FRAME; break; case MV_TYPE_16X8: mv_block->motion_type = XVMC_PREDICTION_16x8; break; case MV_TYPE_FIELD: mv_block->motion_type = XVMC_PREDICTION_FIELD; if (s->picture_structure == PICT_FRAME) { mv_block->PMV[0][0][1] <<= 1; mv_block->PMV[1][0][1] <<= 1; mv_block->PMV[0][1][1] <<= 1; mv_block->PMV[1][1][1] <<= 1; } break; case MV_TYPE_DMV: mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME; if (s->picture_structure == PICT_FRAME) { mv_block->PMV[0][0][0] = s->mv[0][0][0]; // top from top mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1; mv_block->PMV[0][1][0] = s->mv[0][0][0]; // bottom from bottom mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1; mv_block->PMV[1][0][0] = s->mv[0][2][0]; // dmv00, top from bottom mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01 mv_block->PMV[1][1][0] = s->mv[0][3][0]; // dmv10, bottom from top mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11 } else { mv_block->PMV[0][1][0] = s->mv[0][2][0]; // dmv00 mv_block->PMV[0][1][1] = s->mv[0][2][1]; // dmv01 } break; default: assert(0); } mv_block->motion_vertical_field_select = 0; // set correct field references if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) { mv_block->motion_vertical_field_select |= s->field_select[0][0]; mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1; mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2; mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3; } } // !intra // time to handle data blocks mv_block->index = render->next_free_data_block_num; blocks_per_mb = 6; if (s->chroma_format >= 2) { blocks_per_mb = 4 + (1 << s->chroma_format); } // calculate cbp cbp = 0; for (i = 0; i < blocks_per_mb; i++) { cbp += cbp; if (s->block_last_index[i] >= 0) cbp++; } if (s->avctx->flags & AV_CODEC_FLAG_GRAY) { if (s->mb_intra) { // intra frames are always full chroma blocks for (i = 4; i < blocks_per_mb; i++) { memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])); // so we need to clear them if (!render->unsigned_intra) *s->pblocks[i][0] = 1 << 10; } } else { cbp &= 0xf << (blocks_per_mb - 4); blocks_per_mb = 4; // luminance blocks only } } mv_block->coded_block_pattern = cbp; if (cbp == 0) mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN; for (i = 0; i < blocks_per_mb; i++) { if (s->block_last_index[i] >= 0) { // I do not have unsigned_intra MOCO to test, hope it is OK. if (s->mb_intra && (render->idct || !render->unsigned_intra)) *s->pblocks[i][0] -= 1 << 10; if (!render->idct) { s->idsp.idct(*s->pblocks[i]); /* It is unclear if MC hardware requires pixel diff values to be * in the range [-255;255]. TODO: Clipping if such hardware is * ever found. As of now it would only be an unnecessary * slowdown. */ } // copy blocks only if the codec doesn't support pblocks reordering if (s->avctx->xvmc_acceleration == 1) { memcpy(&render->data_blocks[render->next_free_data_block_num*64], s->pblocks[i], sizeof(*s->pblocks[i])); } render->next_free_data_block_num++; } } render->filled_mv_blocks_num++; assert(render->filled_mv_blocks_num <= render->allocated_mv_blocks); assert(render->next_free_data_block_num <= render->allocated_data_blocks); /* The above conditions should not be able to fail as long as this function * is used and the following 'if ()' automatically calls a callback to free * blocks. */ if (render->filled_mv_blocks_num == render->allocated_mv_blocks) ff_mpeg_draw_horiz_band(s, 0, 0); }