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* XVideo Motion Compensation
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* Copyright (c) 2003 Ivan Kalvachev
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include <X11/extensions/XvMC.h>
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#include "mpegvideo.h"
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#include "xvmc_internal.h"
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* Initializes the block field of the MpegEncContext pointer passed as
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* parameter after making sure that the data is not corrupted.
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* In order to implement something like direct rendering instead of decoding
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* coefficients in s->blocks and then copying them, copy them directly
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* into the data_blocks array provided by xvmc.
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void ff_xvmc_init_block(MpegEncContext *s)
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struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
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assert(render && render->xvmc_id == AV_XVMC_ID);
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s->block = (DCTELEM (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
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* Fill individual block pointers, so there are no gaps in the data_block array
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* in case not all blocks in the macroblock are coded.
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void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
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const int mb_block_count = 4 + (1 << s->chroma_format);
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cbp <<= 12-mb_block_count;
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for (i = 0; i < mb_block_count; i++) {
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s->pblocks[i] = &s->block[j++];
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* Find and store the surfaces that are used as reference frames.
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* This function should be called for every new field and/or frame.
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* It should be safe to call the function a few times for the same field.
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int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
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struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
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const int mb_block_count = 4 + (1 << s->chroma_format);
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if (!render || render->xvmc_id != AV_XVMC_ID ||
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!render->data_blocks || !render->mv_blocks ||
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(unsigned int)render->allocated_mv_blocks > INT_MAX/(64*6) ||
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(unsigned int)render->allocated_data_blocks > INT_MAX/64 ||
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av_log(avctx, AV_LOG_ERROR,
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"Render token doesn't look as expected.\n");
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return -1; // make sure that this is a render packet
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if (render->filled_mv_blocks_num) {
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av_log(avctx, AV_LOG_ERROR,
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"Rendering surface contains %i unprocessed blocks.\n",
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render->filled_mv_blocks_num);
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if (render->allocated_mv_blocks < 1 ||
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render->allocated_data_blocks < render->allocated_mv_blocks*mb_block_count ||
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render->start_mv_blocks_num >= render->allocated_mv_blocks ||
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render->next_free_data_block_num >
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render->allocated_data_blocks -
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mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
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av_log(avctx, AV_LOG_ERROR,
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"Rendering surface doesn't provide enough block structures to work with.\n");
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render->picture_structure = s->picture_structure;
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render->flags = s->first_field ? 0 : XVMC_SECOND_FIELD;
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render->p_future_surface = NULL;
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render->p_past_surface = NULL;
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switch(s->pict_type) {
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return 0; // no prediction from other frames
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next = (struct xvmc_pix_fmt*)s->next_picture.data[2];
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if (next->xvmc_id != AV_XVMC_ID)
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render->p_future_surface = next->p_surface;
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// no return here, going to set forward prediction
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last = (struct xvmc_pix_fmt*)s->last_picture.data[2];
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last = render; // predict second field from the first
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if (last->xvmc_id != AV_XVMC_ID)
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render->p_past_surface = last->p_surface;
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* Complete frame/field rendering by passing any remaining blocks.
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* Normally ff_draw_horiz_band() is called for each slice, however,
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* some leftover blocks, for example from error_resilience(), may remain.
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* It should be safe to call the function a few times for the same field.
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void ff_xvmc_field_end(MpegEncContext *s)
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struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
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if (render->filled_mv_blocks_num > 0)
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ff_draw_horiz_band(s, 0, 0);
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* Synthesize the data needed by XvMC to render one macroblock of data.
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* Fill all relevant fields, if necessary do IDCT.
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void ff_xvmc_decode_mb(MpegEncContext *s)
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XvMCMacroBlock *mv_block;
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struct xvmc_pix_fmt *render;
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int i, cbp, blocks_per_mb;
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const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
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av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
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// from MPV_decode_mb(), update DC predictors for P macroblocks
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s->last_dc[2] = 128 << s->intra_dc_precision;
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// MC doesn't skip blocks
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// Do I need to export quant when I could not perform postprocessing?
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// Anyway, it doesn't hurt.
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s->current_picture.qscale_table[mb_xy] = s->qscale;
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// start of XVMC-specific code
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render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
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assert(render->xvmc_id == AV_XVMC_ID);
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assert(render->mv_blocks);
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// take the next free macroblock
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mv_block = &render->mv_blocks[render->start_mv_blocks_num +
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render->filled_mv_blocks_num];
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mv_block->x = s->mb_x;
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mv_block->y = s->mb_y;
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mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
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mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
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mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
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if (s->mv_dir & MV_DIR_FORWARD) {
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mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
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// PMV[n][dir][xy] = mv[dir][n][xy]
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mv_block->PMV[0][0][0] = s->mv[0][0][0];
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mv_block->PMV[0][0][1] = s->mv[0][0][1];
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mv_block->PMV[1][0][0] = s->mv[0][1][0];
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mv_block->PMV[1][0][1] = s->mv[0][1][1];
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if (s->mv_dir & MV_DIR_BACKWARD) {
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mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
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mv_block->PMV[0][1][0] = s->mv[1][0][0];
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mv_block->PMV[0][1][1] = s->mv[1][0][1];
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mv_block->PMV[1][1][0] = s->mv[1][1][0];
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mv_block->PMV[1][1][1] = s->mv[1][1][1];
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mv_block->motion_type = XVMC_PREDICTION_FRAME;
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mv_block->motion_type = XVMC_PREDICTION_16x8;
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mv_block->motion_type = XVMC_PREDICTION_FIELD;
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if (s->picture_structure == PICT_FRAME) {
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mv_block->PMV[0][0][1] <<= 1;
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mv_block->PMV[1][0][1] <<= 1;
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mv_block->PMV[0][1][1] <<= 1;
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mv_block->PMV[1][1][1] <<= 1;
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mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
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if (s->picture_structure == PICT_FRAME) {
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mv_block->PMV[0][0][0] = s->mv[0][0][0]; // top from top
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mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
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mv_block->PMV[0][1][0] = s->mv[0][0][0]; // bottom from bottom
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mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
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mv_block->PMV[1][0][0] = s->mv[0][2][0]; // dmv00, top from bottom
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mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
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mv_block->PMV[1][1][0] = s->mv[0][3][0]; // dmv10, bottom from top
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mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
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mv_block->PMV[0][1][0] = s->mv[0][2][0]; // dmv00
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mv_block->PMV[0][1][1] = s->mv[0][2][1]; // dmv01
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mv_block->motion_vertical_field_select = 0;
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// set correct field references
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if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
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mv_block->motion_vertical_field_select |= s->field_select[0][0];
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mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
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mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
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mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
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// time to handle data blocks
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mv_block->index = render->next_free_data_block_num;
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if (s->chroma_format >= 2) {
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blocks_per_mb = 4 + (1 << s->chroma_format);
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for (i = 0; i < blocks_per_mb; i++) {
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if (s->block_last_index[i] >= 0)
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if (s->flags & CODEC_FLAG_GRAY) {
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if (s->mb_intra) { // intra frames are always full chroma blocks
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for (i = 4; i < blocks_per_mb; i++) {
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memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])); // so we need to clear them
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if (!render->unsigned_intra)
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*s->pblocks[i][0] = 1 << 10;
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cbp &= 0xf << (blocks_per_mb - 4);
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blocks_per_mb = 4; // luminance blocks only
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mv_block->coded_block_pattern = cbp;
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mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
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for (i = 0; i < blocks_per_mb; i++) {
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if (s->block_last_index[i] >= 0) {
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// I do not have unsigned_intra MOCO to test, hope it is OK.
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if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
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*s->pblocks[i][0] -= 1 << 10;
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s->dsp.idct(*s->pblocks[i]);
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/* It is unclear if MC hardware requires pixel diff values to be
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* in the range [-255;255]. TODO: Clipping if such hardware is
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* ever found. As of now it would only be an unnecessary
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// copy blocks only if the codec doesn't support pblocks reordering
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if (s->avctx->xvmc_acceleration == 1) {
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memcpy(&render->data_blocks[render->next_free_data_block_num*64],
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s->pblocks[i], sizeof(*s->pblocks[i]));
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render->next_free_data_block_num++;
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render->filled_mv_blocks_num++;
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assert(render->filled_mv_blocks_num <= render->allocated_mv_blocks);
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assert(render->next_free_data_block_num <= render->allocated_data_blocks);
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/* The above conditions should not be able to fail as long as this function
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* is used and the following 'if ()' automatically calls a callback to free
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if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
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ff_draw_horiz_band(s, 0, 0);
added
removed
libavcodec/mpegvideo_xvmc.c
