Subversion Repositories Kolibri OS

/*

 * H263/MPEG4 backend for encoder and decoder

 * Copyright (c) 2000,2001 Fabrice Bellard

 * H263+ support.

 * Copyright (c) 2001 Juan J. Sierralta P

 * Copyright (c) 2002-2004 Michael Niedermayer 

 *

 * 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

 */

/**

 * @file

 * h263/mpeg4 codec.

 */

#include 

#include "avcodec.h"

#include "mpegvideo.h"

#include "h263.h"

#include "h263data.h"

#include "mathops.h"

#include "unary.h"

#include "flv.h"

#include "mpeg4video.h"

uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];

void ff_h263_update_motion_val(MpegEncContext * s){

    const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;

               //FIXME a lot of that is only needed for !low_delay

    const int wrap = s->b8_stride;

    const int xy = s->block_index[0];

    s->current_picture.mbskip_table[mb_xy] = s->mb_skipped;

    if(s->mv_type != MV_TYPE_8X8){

        int motion_x, motion_y;

        if (s->mb_intra) {

            motion_x = 0;

            motion_y = 0;

        } else if (s->mv_type == MV_TYPE_16X16) {

            motion_x = s->mv[0][0][0];

            motion_y = s->mv[0][0][1];

        } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {

            int i;

            motion_x = s->mv[0][0][0] + s->mv[0][1][0];

            motion_y = s->mv[0][0][1] + s->mv[0][1][1];

            motion_x = (motion_x>>1) | (motion_x&1);

            for(i=0; i<2; i++){

                s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];

                s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];

            }

            s->current_picture.ref_index[0][4*mb_xy    ] =

            s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];

            s->current_picture.ref_index[0][4*mb_xy + 2] =

            s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];

        }

        /* no update if 8X8 because it has been done during parsing */

        s->current_picture.motion_val[0][xy][0]            = motion_x;

        s->current_picture.motion_val[0][xy][1]            = motion_y;

        s->current_picture.motion_val[0][xy + 1][0]        = motion_x;

        s->current_picture.motion_val[0][xy + 1][1]        = motion_y;

        s->current_picture.motion_val[0][xy + wrap][0]     = motion_x;

        s->current_picture.motion_val[0][xy + wrap][1]     = motion_y;

        s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;

        s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;

    }

    if(s->encoding){ //FIXME encoding MUST be cleaned up

        if (s->mv_type == MV_TYPE_8X8)

            s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;

        else if(s->mb_intra)

            s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;

        else

            s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;

    }

}

int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)

{

    int x, y, wrap, a, c, pred_dc;

    int16_t *dc_val;

    /* find prediction */

    if (n < 4) {

        x = 2 * s->mb_x + (n & 1);

        y = 2 * s->mb_y + ((n & 2) >> 1);

        wrap = s->b8_stride;

        dc_val = s->dc_val[0];

    } else {

        x = s->mb_x;

        y = s->mb_y;

        wrap = s->mb_stride;

        dc_val = s->dc_val[n - 4 + 1];

    }

    /* B C

     * A X

     */

    a = dc_val[(x - 1) + (y) * wrap];

    c = dc_val[(x) + (y - 1) * wrap];

    /* No prediction outside GOB boundary */

    if(s->first_slice_line && n!=3){

        if(n!=2) c= 1024;

        if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;

    }

    /* just DC prediction */

    if (a != 1024 && c != 1024)

        pred_dc = (a + c) >> 1;

    else if (a != 1024)

        pred_dc = a;

    else

        pred_dc = c;

    /* we assume pred is positive */

    *dc_val_ptr = &dc_val[x + y * wrap];

    return pred_dc;

}

void ff_h263_loop_filter(MpegEncContext * s){

    int qp_c;

    const int linesize  = s->linesize;

    const int uvlinesize= s->uvlinesize;

    const int xy = s->mb_y * s->mb_stride + s->mb_x;

    uint8_t *dest_y = s->dest[0];

    uint8_t *dest_cb= s->dest[1];

    uint8_t *dest_cr= s->dest[2];

//    if(s->pict_type==AV_PICTURE_TYPE_B && !s->readable) return;

    /*

       Diag Top

       Left Center

    */

    if (!IS_SKIP(s->current_picture.mb_type[xy])) {

        qp_c= s->qscale;

        s->dsp.h263_v_loop_filter(dest_y+8*linesize  , linesize, qp_c);

        s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);

    }else

        qp_c= 0;

    if(s->mb_y){

        int qp_dt, qp_tt, qp_tc;

        if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride]))

            qp_tt=0;

        else

            qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];

        if(qp_c)

            qp_tc= qp_c;

        else

            qp_tc= qp_tt;

        if(qp_tc){

            const int chroma_qp= s->chroma_qscale_table[qp_tc];

            s->dsp.h263_v_loop_filter(dest_y  ,   linesize, qp_tc);

            s->dsp.h263_v_loop_filter(dest_y+8,   linesize, qp_tc);

            s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);

            s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);

        }

        if(qp_tt)

            s->dsp.h263_h_loop_filter(dest_y-8*linesize+8  ,   linesize, qp_tt);

        if(s->mb_x){

            if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride]))

                qp_dt= qp_tt;

            else

                qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride];

            if(qp_dt){

                const int chroma_qp= s->chroma_qscale_table[qp_dt];

                s->dsp.h263_h_loop_filter(dest_y -8*linesize  ,   linesize, qp_dt);

                s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);

                s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);

            }

        }

    }

    if(qp_c){

        s->dsp.h263_h_loop_filter(dest_y +8,   linesize, qp_c);

        if(s->mb_y + 1 == s->mb_height)

            s->dsp.h263_h_loop_filter(dest_y+8*linesize+8,   linesize, qp_c);

    }

    if(s->mb_x){

        int qp_lc;

        if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1]))

            qp_lc= qp_c;

        else

            qp_lc = s->current_picture.qscale_table[xy - 1];

        if(qp_lc){

            s->dsp.h263_h_loop_filter(dest_y,   linesize, qp_lc);

            if(s->mb_y + 1 == s->mb_height){

                const int chroma_qp= s->chroma_qscale_table[qp_lc];

                s->dsp.h263_h_loop_filter(dest_y +8*  linesize,   linesize, qp_lc);

                s->dsp.h263_h_loop_filter(dest_cb             , uvlinesize, chroma_qp);

                s->dsp.h263_h_loop_filter(dest_cr             , uvlinesize, chroma_qp);

            }

        }

    }

}

void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)

{

    int x, y, wrap, a, c, pred_dc, scale, i;

    int16_t *dc_val, *ac_val, *ac_val1;

    /* find prediction */

    if (n < 4) {

        x = 2 * s->mb_x + (n & 1);

        y = 2 * s->mb_y + (n>> 1);

        wrap = s->b8_stride;

        dc_val = s->dc_val[0];

        ac_val = s->ac_val[0][0];

        scale = s->y_dc_scale;

    } else {

        x = s->mb_x;

        y = s->mb_y;

        wrap = s->mb_stride;

        dc_val = s->dc_val[n - 4 + 1];

        ac_val = s->ac_val[n - 4 + 1][0];

        scale = s->c_dc_scale;

    }

    ac_val += ((y) * wrap + (x)) * 16;

    ac_val1 = ac_val;

    /* B C

     * A X

     */

    a = dc_val[(x - 1) + (y) * wrap];

    c = dc_val[(x) + (y - 1) * wrap];

    /* No prediction outside GOB boundary */

    if(s->first_slice_line && n!=3){

        if(n!=2) c= 1024;

        if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;

    }

    if (s->ac_pred) {

        pred_dc = 1024;

        if (s->h263_aic_dir) {

            /* left prediction */

            if (a != 1024) {

                ac_val -= 16;

                for(i=1;i<8;i++) {

                    block[s->dsp.idct_permutation[i<<3]] += ac_val[i];

                }

                pred_dc = a;

            }

        } else {

            /* top prediction */

            if (c != 1024) {

                ac_val -= 16 * wrap;

                for(i=1;i<8;i++) {

                    block[s->dsp.idct_permutation[i   ]] += ac_val[i + 8];

                }

                pred_dc = c;

            }

        }

    } else {

        /* just DC prediction */

        if (a != 1024 && c != 1024)

            pred_dc = (a + c) >> 1;

        else if (a != 1024)

            pred_dc = a;

        else

            pred_dc = c;

    }

    /* we assume pred is positive */

    block[0]=block[0]*scale + pred_dc;

    if (block[0] < 0)

        block[0] = 0;

    else

        block[0] |= 1;

    /* Update AC/DC tables */

    dc_val[(x) + (y) * wrap] = block[0];

    /* left copy */

    for(i=1;i<8;i++)

        ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];

    /* top copy */

    for(i=1;i<8;i++)

        ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];

}

int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,

                             int *px, int *py)

{

    int wrap;

    int16_t *A, *B, *C, (*mot_val)[2];

    static const int off[4]= {2, 1, 1, -1};

    wrap = s->b8_stride;

    mot_val = s->current_picture.motion_val[dir] + s->block_index[block];

    A = mot_val[ - 1];

    /* special case for first (slice) line */

    if (s->first_slice_line && block<3) {

        // we can't just change some MVs to simulate that as we need them for the B frames (and ME)

        // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(

        if(block==0){ //most common case

            if(s->mb_x  == s->resync_mb_x){ //rare

                *px= *py = 0;

            }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare

                C = mot_val[off[block] - wrap];

                if(s->mb_x==0){

                    *px = C[0];

                    *py = C[1];

                }else{

                    *px = mid_pred(A[0], 0, C[0]);

                    *py = mid_pred(A[1], 0, C[1]);

                }

            }else{

                *px = A[0];

                *py = A[1];

            }

        }else if(block==1){

            if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare

                C = mot_val[off[block] - wrap];

                *px = mid_pred(A[0], 0, C[0]);

                *py = mid_pred(A[1], 0, C[1]);

            }else{

                *px = A[0];

                *py = A[1];

            }

        }else{ /* block==2*/

            B = mot_val[ - wrap];

            C = mot_val[off[block] - wrap];

            if(s->mb_x == s->resync_mb_x) //rare

                A[0]=A[1]=0;

            *px = mid_pred(A[0], B[0], C[0]);

            *py = mid_pred(A[1], B[1], C[1]);

        }

    } else {

        B = mot_val[ - wrap];

        C = mot_val[off[block] - wrap];

        *px = mid_pred(A[0], B[0], C[0]);

        *py = mid_pred(A[1], B[1], C[1]);

    }

    return *mot_val;

}

/**

 * Get the GOB height based on picture height.

 */

int ff_h263_get_gob_height(MpegEncContext *s){

    if (s->height <= 400)

        return 1;

    else if (s->height <= 800)

        return  2;

    else

        return 4;

}