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ffmpeg / libavcodec / mpegvideo_xvmc.c @ 1fcef408

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/*
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 * XVideo Motion Compensation
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 * Copyright (c) 2003 Ivan Kalvachev
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 *
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 * This file is part of FFmpeg.
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 *
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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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 *
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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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 *
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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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 */
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#include <limits.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#undef NDEBUG
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#include <assert.h>
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#include "xvmc.h"
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#include "xvmc_internal.h"
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/**
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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 decodeing
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 * coefficients in s->blocks and then copy them, do that directly
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 * into the data_blocks array provided by xvmc.
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 */
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void ff_xvmc_init_block(MpegEncContext *s)
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{
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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_RENDER_MAGIC);
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    s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
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}
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/**
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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 MB are coded.
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 */
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void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
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{
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    int i, j = 0;
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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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        if (cbp & (1 << 11))
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            s->pblocks[i] = (short *)(&s->block[j++]);
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        else
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            s->pblocks[i] = NULL;
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        cbp+=cbp;
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    }
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}
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/**
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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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 */
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int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
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{
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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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    assert(avctx);
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    if (!render || render->xvmc_id != AV_XVMC_RENDER_MAGIC ||
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        !render->data_blocks || !render->mv_blocks) {
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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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    }
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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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        return -1;
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    }
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    if (render->total_number_of_mv_blocks   < 1 ||
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        render->total_number_of_data_blocks < mb_block_count) {
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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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        return -1;
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    }
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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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        case  FF_I_TYPE:
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            return 0; // no prediction from other frames
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        case  FF_B_TYPE:
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            next = (struct xvmc_pix_fmt*)s->next_picture.data[2];
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            if (!next)
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                return -1;
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            if (next->xvmc_id != AV_XVMC_RENDER_MAGIC)
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                return -1;
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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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        case  FF_P_TYPE:
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            last = (struct xvmc_pix_fmt*)s->last_picture.data[2];
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            if (!last)
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                last = render; // predict second field from the first
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            if (last->xvmc_id != AV_XVMC_RENDER_MAGIC)
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                return -1;
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            render->p_past_surface = last->p_surface;
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            return 0;
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    }
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return -1;
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}
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/**
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 * Complete frame/field rendering by passing any remaining blocks.
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 * Normally ff_draw_horiz_band() is called on each slice, however
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 * there may be some remaining blocks, for example put by error_resilience.
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 * It should be safe to call the function a few times for the same field.
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 */
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void ff_xvmc_field_end(MpegEncContext *s)
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{
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    struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
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    assert(render);
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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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}
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/**
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 * Synthesize the data needed by XvMC to render one macroblock of data.
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 * Fill all relevent fields, if necessery do IDCT.
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 */
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void ff_xvmc_decode_mb(MpegEncContext *s)
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{
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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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    if (s->encoding) {
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        av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
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        return;
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    }
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    // from MPV_decode_mb(), update DC predictors for P macroblocks
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    if (!s->mb_intra) {
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        s->last_dc[0] =
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        s->last_dc[1] =
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        s->last_dc[2] =  128 << s->intra_dc_precision;
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    }
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    // MC doesn't skip blocks
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    s->mb_skipped = 0;
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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);
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    assert(render->xvmc_id == AV_XVMC_RENDER_MAGIC);
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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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    if (s->mb_intra) {
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        mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
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    } else {
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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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        }
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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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        }
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        switch(s->mv_type) {
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            case  MV_TYPE_16X16:
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                mv_block->motion_type = XVMC_PREDICTION_FRAME;
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                break;
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            case  MV_TYPE_16X8:
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                mv_block->motion_type = XVMC_PREDICTION_16x8;
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                break;
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            case  MV_TYPE_FIELD:
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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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                }
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                break;
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            case  MV_TYPE_DMV:
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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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                } else {
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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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                }
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                break;
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            default:
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                assert(0);
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        }
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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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        }
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    } // !intra
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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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    blocks_per_mb = 6;
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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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    }
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    // calculate cbp
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    cbp = 0;
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    for (i = 0; i < blocks_per_mb; i++) {
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        cbp += cbp;
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        if (s->block_last_index[i] >= 0)
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            cbp++;
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    }
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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(short)*64);  // 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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            }
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        } else {
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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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        }
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    }
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    mv_block->coded_block_pattern = cbp;
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    if (cbp == 0)
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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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            if (!render->idct) {
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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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                 * slowdown. */
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            }
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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(short)*64);
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            }
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            render->next_free_data_block_num++;
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        }
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    }
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    render->filled_mv_blocks_num++;
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    assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
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    assert(render->next_free_data_block_num <= render->total_number_of_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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     * blocks. */
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    if (render->filled_mv_blocks_num == render->total_number_of_mv_blocks)
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        ff_draw_horiz_band(s, 0, 0);
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}