cavs.c

ffmpeg移植到symbian的全部源代码

    qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?
    if(!square){
        qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);
    }

    if(emu){
        ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,
                            9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
        src_cb= s->edge_emu_buffer;
    }
    chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);

    if(emu){
        ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,
                            9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
        src_cr= s->edge_emu_buffer;
    }
    chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);
}

static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,
                        uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,
                        int x_offset, int y_offset,qpel_mc_func *qpix_put,
                        h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,
                        h264_chroma_mc_func chroma_avg, vector_t *mv){
    qpel_mc_func *qpix_op=  qpix_put;
    h264_chroma_mc_func chroma_op= chroma_put;

    dest_y  += 2*x_offset + 2*y_offset*h->l_stride;
    dest_cb +=   x_offset +   y_offset*h->c_stride;
    dest_cr +=   x_offset +   y_offset*h->c_stride;
    x_offset += 8*h->mbx;
    y_offset += 8*h->mby;

    if(mv->ref >= 0){
        Picture *ref= &h->DPB[mv->ref];
        mc_dir_part(h, ref, square, chroma_height, delta, 0,
                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
                    qpix_op, chroma_op, mv);

        qpix_op=  qpix_avg;
        chroma_op= chroma_avg;
    }

    if((mv+MV_BWD_OFFS)->ref >= 0){
        Picture *ref= &h->DPB[0];
        mc_dir_part(h, ref, square, chroma_height, delta, 1,
                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
                    qpix_op, chroma_op, mv+MV_BWD_OFFS);
    }
}

void ff_cavs_inter(AVSContext *h, enum mb_t mb_type) {
    if(ff_cavs_partition_flags[mb_type] == 0){ // 16x16
        mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,
                h->s.dsp.put_cavs_qpel_pixels_tab[0],
                h->s.dsp.put_h264_chroma_pixels_tab[0],
                h->s.dsp.avg_cavs_qpel_pixels_tab[0],
                h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);
    }else{
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,
                h->s.dsp.put_cavs_qpel_pixels_tab[1],
                h->s.dsp.put_h264_chroma_pixels_tab[1],
                h->s.dsp.avg_cavs_qpel_pixels_tab[1],
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,
                h->s.dsp.put_cavs_qpel_pixels_tab[1],
                h->s.dsp.put_h264_chroma_pixels_tab[1],
                h->s.dsp.avg_cavs_qpel_pixels_tab[1],
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,
                h->s.dsp.put_cavs_qpel_pixels_tab[1],
                h->s.dsp.put_h264_chroma_pixels_tab[1],
                h->s.dsp.avg_cavs_qpel_pixels_tab[1],
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,
                h->s.dsp.put_cavs_qpel_pixels_tab[1],
                h->s.dsp.put_h264_chroma_pixels_tab[1],
                h->s.dsp.avg_cavs_qpel_pixels_tab[1],
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);
    }
}

/*****************************************************************************
 *
 * motion vector prediction
 *
 ****************************************************************************/

static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, vector_t *src, int distp) {
    int den = h->scale_den[src->ref];

    *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;
    *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;
}

static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, vector_t *mvB, vector_t *mvC) {
    int ax, ay, bx, by, cx, cy;
    int len_ab, len_bc, len_ca, len_mid;

    /* scale candidates according to their temporal span */
    scale_mv(h, &ax, &ay, mvA, mvP->dist);
    scale_mv(h, &bx, &by, mvB, mvP->dist);
    scale_mv(h, &cx, &cy, mvC, mvP->dist);
    /* find the geometrical median of the three candidates */
    len_ab = abs(ax - bx) + abs(ay - by);
    len_bc = abs(bx - cx) + abs(by - cy);
    len_ca = abs(cx - ax) + abs(cy - ay);
    len_mid = mid_pred(len_ab, len_bc, len_ca);
    if(len_mid == len_ab) {
        mvP->x = cx;
        mvP->y = cy;
    } else if(len_mid == len_bc) {
        mvP->x = ax;
        mvP->y = ay;
    } else {
        mvP->x = bx;
        mvP->y = by;
    }
}

void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
                enum mv_pred_t mode, enum block_t size, int ref) {
    vector_t *mvP = &h->mv[nP];
    vector_t *mvA = &h->mv[nP-1];
    vector_t *mvB = &h->mv[nP-4];
    vector_t *mvC = &h->mv[nC];
    const vector_t *mvP2 = NULL;

    mvP->ref = ref;
    mvP->dist = h->dist[mvP->ref];
    if(mvC->ref == NOT_AVAIL)
        mvC = &h->mv[nP-5]; // set to top-left (mvD)
    if((mode == MV_PRED_PSKIP) &&
       ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||
           ((mvA->x | mvA->y | mvA->ref) == 0)  ||
           ((mvB->x | mvB->y | mvB->ref) == 0) )) {
        mvP2 = &ff_cavs_un_mv;
    /* if there is only one suitable candidate, take it */
    } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {
        mvP2= mvA;
    } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {
        mvP2= mvB;
    } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {
        mvP2= mvC;
    } else if(mode == MV_PRED_LEFT     && mvA->ref == ref){
        mvP2= mvA;
    } else if(mode == MV_PRED_TOP      && mvB->ref == ref){
        mvP2= mvB;
    } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){
        mvP2= mvC;
    }
    if(mvP2){
        mvP->x = mvP2->x;
        mvP->y = mvP2->y;
    }else
        mv_pred_median(h, mvP, mvA, mvB, mvC);

    if(mode < MV_PRED_PSKIP) {
        mvP->x += get_se_golomb(&h->s.gb);
        mvP->y += get_se_golomb(&h->s.gb);
    }
    set_mvs(mvP,size);
}

/*****************************************************************************
 *
 * macroblock level
 *
 ****************************************************************************/

/**
 * initialise predictors for motion vectors and intra prediction
 */
void ff_cavs_init_mb(AVSContext *h) {
    int i;

    /* copy predictors from top line (MB B and C) into cache */
    for(i=0;i<3;i++) {
        h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
        h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
    }
    h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
    h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
    /* clear top predictors if MB B is not available */
    if(!(h->flags & B_AVAIL)) {
        h->mv[MV_FWD_B2] = ff_cavs_un_mv;
        h->mv[MV_FWD_B3] = ff_cavs_un_mv;
        h->mv[MV_BWD_B2] = ff_cavs_un_mv;
        h->mv[MV_BWD_B3] = ff_cavs_un_mv;
        h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
        h->flags &= ~(C_AVAIL|D_AVAIL);
    } else if(h->mbx) {
        h->flags |= D_AVAIL;
    }
    if(h->mbx == h->mb_width-1) //MB C not available
        h->flags &= ~C_AVAIL;
    /* clear top-right predictors if MB C is not available */
    if(!(h->flags & C_AVAIL)) {
        h->mv[MV_FWD_C2] = ff_cavs_un_mv;
        h->mv[MV_BWD_C2] = ff_cavs_un_mv;
    }
    /* clear top-left predictors if MB D is not available */
    if(!(h->flags & D_AVAIL)) {
        h->mv[MV_FWD_D3] = ff_cavs_un_mv;
        h->mv[MV_BWD_D3] = ff_cavs_un_mv;
    }
    /* set pointer for co-located macroblock type */
    h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx];
}

/**
 * save predictors for later macroblocks and increase
 * macroblock address
 * @returns 0 if end of frame is reached, 1 otherwise
 */
int ff_cavs_next_mb(AVSContext *h) {
    int i;

    h->flags |= A_AVAIL;
    h->cy += 16;
    h->cu += 8;
    h->cv += 8;
    /* copy mvs as predictors to the left */
    for(i=0;i<=20;i+=4)
        h->mv[i] = h->mv[i+2];
    /* copy bottom mvs from cache to top line */
    h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
    h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
    h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
    h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
    /* next MB address */
    h->mbx++;
    if(h->mbx == h->mb_width) { //new mb line
        h->flags = B_AVAIL|C_AVAIL;
        /* clear left pred_modes */
        h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
        /* clear left mv predictors */
        for(i=0;i<=20;i+=4)
            h->mv[i] = ff_cavs_un_mv;
        h->mbx = 0;
        h->mby++;
        /* re-calculate sample pointers */
        h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
        h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
        h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
        if(h->mby == h->mb_height) { //frame end
            return 0;
        } else {
            //check_for_slice(h);
        }
    }
    return 1;
}

/*****************************************************************************
 *
 * frame level
 *
 ****************************************************************************/

void ff_cavs_init_pic(AVSContext *h) {
    int i;

    /* clear some predictors */
    for(i=0;i<=20;i+=4)
        h->mv[i] = ff_cavs_un_mv;
    h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
    set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
    h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
    set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
    h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
    h->cy = h->picture.data[0];
    h->cu = h->picture.data[1];
    h->cv = h->picture.data[2];
    h->l_stride = h->picture.linesize[0];
    h->c_stride = h->picture.linesize[1];
    h->luma_scan[2] = 8*h->l_stride;
    h->luma_scan[3] = 8*h->l_stride+8;
    h->mbx = h->mby = 0;
    h->flags = 0;
}

/*****************************************************************************
 *
 * headers and interface
 *
 ****************************************************************************/

/**
 * some predictions require data from the top-neighbouring macroblock.
 * this data has to be stored for one complete row of macroblocks
 * and this storage space is allocated here
 */
void ff_cavs_init_top_lines(AVSContext *h) {
    /* alloc top line of predictors */
    h->top_qp       = av_malloc( h->mb_width);
    h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));
    h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));
    h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));
    h->top_border_y = av_malloc((h->mb_width+1)*16);
    h->top_border_u = av_malloc((h->mb_width)*10);
    h->top_border_v = av_malloc((h->mb_width)*10);

    /* alloc space for co-located MVs and types */
    h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));
    h->col_type_base = av_malloc(h->mb_width*h->mb_height);
    h->block        = av_mallocz(64*sizeof(DCTELEM));
}

av_cold int ff_cavs_init(AVCodecContext *avctx) {
    AVSContext *h = avctx->priv_data;
    MpegEncContext * const s = &h->s;

    MPV_decode_defaults(s);
    s->avctx = avctx;

    avctx->pix_fmt= PIX_FMT_YUV420P;

    h->luma_scan[0] = 0;
    h->luma_scan[1] = 8;
    h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;
    h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;
    h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;
    h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;
    h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;
    h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;
    h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;
    h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;
    h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;
    h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;
    h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;
    h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;
    h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;
    h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;
    h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;
    h->mv[ 7] = ff_cavs_un_mv;
    h->mv[19] = ff_cavs_un_mv;
    return 0;
}

av_cold int ff_cavs_end(AVCodecContext *avctx) {
    AVSContext *h = avctx->priv_data;

    av_free(h->top_qp);
    av_free(h->top_mv[0]);
    av_free(h->top_mv[1]);
    av_free(h->top_pred_Y);
    av_free(h->top_border_y);
    av_free(h->top_border_u);
    av_free(h->top_border_v);
    av_free(h->col_mv);
    av_free(h->col_type_base);
    av_free(h->block);
    return 0;
}