s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
s->c_dc_scale= s->c_dc_scale_table[ s->chroma_qscale ];
static int rv10_decode_packet(AVCodecContext *avctx,                              uint8_t *buf, int buf_size){    MpegEncContext *s = avctx->priv_data;    int i, mb_count, mb_pos, left;    init_get_bits(&s->gb, buf, buf_size*8);#if 0    for(i=0; i<buf_size*8 && i<100; i++)        printf("%d", get_bits1(&s->gb));    printf("\n");    return 0;#endif    if(s->codec_id ==CODEC_ID_RV10)        mb_count = rv10_decode_picture_header(s);    else        mb_count = rv20_decode_picture_header(s);    if (mb_count < 0) {        av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");        return -1;    }        if (s->mb_x >= s->mb_width ||        s->mb_y >= s->mb_height) {        av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);        return -1;    }    mb_pos = s->mb_y * s->mb_width + s->mb_x;    left = s->mb_width * s->mb_height - mb_pos;    if (mb_count > left) {        av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");        return -1;    }//if(s->pict_type == P_TYPE) return 0;    if (s->mb_x == 0 && s->mb_y == 0) {        if(MPV_frame_start(s, avctx) < 0)            return -1;    }#ifdef DEBUG    printf("qscale=%d\n", s->qscale);#endif    /* default quantization values */    if(s->codec_id== CODEC_ID_RV10){        if(s->mb_y==0) s->first_slice_line=1;    }else{        s->first_slice_line=1;            s->resync_mb_x= s->mb_x;        s->resync_mb_y= s->mb_y;    }    if(s->h263_aic){        s->y_dc_scale_table=         s->c_dc_scale_table= ff_aic_dc_scale_table;    }else{        s->y_dc_scale_table=        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;    }    s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];    s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];        s->rv10_first_dc_coded[0] = 0;    s->rv10_first_dc_coded[1] = 0;    s->rv10_first_dc_coded[2] = 0;    s->block_wrap[0]=    s->block_wrap[1]=    s->block_wrap[2]=    s->block_wrap[3]= s->mb_width*2 + 2;    s->block_wrap[4]=    s->block_wrap[5]= s->mb_width + 2;    ff_init_block_index(s);    /* decode each macroblock */    for(i=0;i<mb_count;i++) {        int ret;        ff_update_block_index(s);#ifdef DEBUG        printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);#endif        	s->dsp.clear_blocks(s->block[0]);        s->mv_dir = MV_DIR_FORWARD;        s->mv_type = MV_TYPE_16X16;         ret=ff_h263_decode_mb(s, s->block);        if (ret == SLICE_ERROR) {            av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);            return -1;        }        ff_h263_update_motion_val(s);        MPV_decode_mb(s, s->block);        if (++s->mb_x == s->mb_width) {            s->mb_x = 0;            s->mb_y++;            ff_init_block_index(s);        }        if(s->mb_x == s->resync_mb_x)            s->first_slice_line=0;        if(ret == SLICE_END) break;    }    return buf_size;}