put_tag(pb, hdlr);
put_buffer(pb, hdlr, 4);
static int mov_write_hdlr_tag(ByteIOContext *pb, MOVTrack* track){    char *descr, *hdlr, *hdlr_type;    int pos = url_ftell(pb);        if (!track) { /* no media --> data handler */	hdlr = "dhlr";	hdlr_type = "url ";	descr = "DataHandler";    } else {	hdlr = (track->mode == MODE_MOV) ? "mhlr" : "\0\0\0\0";	if (track->enc->codec_type == CODEC_TYPE_VIDEO) {	    hdlr_type = "vide";	    descr = "VideoHandler";	} else {	    hdlr_type = "soun";	    descr = "SoundHandler";	}    }        put_be32(pb, 0); /* size */    put_tag(pb, "hdlr");    put_be32(pb, 0); /* Version & flags */    put_tag(pb, hdlr); /* handler */    put_tag(pb, hdlr_type); /* handler type */    put_be32(pb ,0); /* reserved */    put_be32(pb ,0); /* reserved */    put_be32(pb ,0); /* reserved */    put_byte(pb, strlen(descr)); /* string counter */    put_buffer(pb, descr, strlen(descr)); /* handler description */    return updateSize(pb, pos);}