static void cmv_decode_inter(CmvContext * s, const uint8_t *buf, const uint8_t *buf_end){

    const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);

    int x,y,i;



    i = 0;

    for(y=0; y<s->avctx->height/4; y++)

    for(x=0; x<s->avctx->width/4 && buf+i<buf_end; x++) {

        if (buf[i]==0xFF) {

            unsigned char *dst = s->frame.data[0] + (y*4)*s->frame.linesize[0] + x*4;

            if (raw+16<buf_end && *raw==0xFF) { /* intra */

                raw++;

                memcpy(dst, raw, 4);

                memcpy(dst+s->frame.linesize[0], raw+4, 4);

                memcpy(dst+2*s->frame.linesize[0], raw+8, 4);

                memcpy(dst+3*s->frame.linesize[0], raw+12, 4);

                raw+=16;

            }else if(raw<buf_end) {  /* inter using second-last frame as reference */

                int xoffset = (*raw & 0xF) - 7;

                int yoffset = ((*raw >> 4)) - 7;

                if (s->last2_frame.data[0])

                    cmv_motcomp(s->frame.data[0], s->frame.linesize[0],

                                s->last2_frame.data[0], s->last2_frame.linesize[0],

                                x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);

                raw++;

            }

        }else{  /* inter using last frame as reference */

            int xoffset = (buf[i] & 0xF) - 7;

            int yoffset = ((buf[i] >> 4)) - 7;

            cmv_motcomp(s->frame.data[0], s->frame.linesize[0],

                      s->last_frame.data[0], s->last_frame.linesize[0],

                      x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);

        }

        i++;

    }

}
